John A. Mitchell

Computational Multiscale

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Computational Multiscale

jamitch@sandia.gov

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(505) 844-3435

Sandia National Laboratories, New Mexico
P.O. Box 5800
Albuquerque, NM 87185-1322

Brief Research and Project History

  • Nonlinear solver algorithms and implementations for solid mechanics
  • Engineering project management
  • Technology maturation and assessment
  • Constitutive model development (particularly Peridynamics)
  • GPU programming
  • Inverse problems
  • Monte Carlo models for grain growth in metals
  • Data analytics applied to metal material microstructures, insitu pyrometry data
  • Microstructure effects on dynamic response of additively manufactured metals

Current Activities

My work is at the confluence of engineering mechanics (especially continuum mechanics), materials and data science, mathematics, algorithms development, and software implementations. I am especially interested in bridging the gap between engineering and applied mathematics, and demonstrating and/or developing novel solutions and implementations for emerging problems

  • Microstructure effects on dynamic response of materials
  • Monte Carlo grain growth modeling of welding and additive manufacturing processes (see SPPARKS)
  • Data analytics & machine learning applied to material microstructures
  • Peridynamics constitutive model development towards multiscale analysis and upscaling
  • Processing and analysis of measured additive manufacturing pyrometer data

Recent Project Work and Activities (See reports/presentations below)

Other Activities and Interests

I’m from Homer Alaska and I like to visit there during the summer for camping/hiking/fishing and visiting with friends. I also like to exercise and at one time was very active in training for triathlons — now I just try to move a bit every day.

Education

  • B.S. Ocean Engineering Texas A&M University (1987)
  • M.S. Engineering Mechanics Virginia Tech (Advisor: J.N. Reddy, Thesis topic: Finite element formulation and implementation for piezoelectricity) (1992)
  • Ph.D. Mechanical Engineering Texas A&M University (Advisor: J.N. Reddy, Thesis topic: Multilevel/hierarchical preconditioning for p-finite elements) (1997)

Publications

Jeremy Trageser, John A. Mitchell, Kyle Johnson, (2022). Employing a Bezier curve model for simulating microstructure generation during the AM process Wccm 2022 Document ID: 1573305

Brittany Ann Branch, Timothy Ruggles, David G. Moore, John Carter Miers, Paul Elliott Specht, Sakun Duwal, John A. Mitchell, Stewart A. Silling, Benx Brown, Johnx Carpenter, (2022). Understanding microstructural effects of spallation in additively manufactured Ti-5Al-5V-5Mo-3Cr towards the development of a two-phase microstructurally aware model. 22nd Biennial APS Shock Compression of Condensed Matter Conference Document ID: 1551975

Brittany Ann Branch, Justin Lee Brown, Timothy Ruggles, Stewart A. Silling, John A. Mitchell, David P. Adams, Paul Elliott Specht, (2022). Probing the effects of microstructure on material strength in additively manufactured 304L stainless steel through Richtmeyer-Meshkov instability experiments 32 Mat JOWOG Document ID: 1517269

Theron Rodgers, Jonathan D Madison, Daniel Moser, John A. Mitchell, Fadi Abdeljawad, Hojun Lim, Jeremy Trageser, Judith Alice Brown, Joseph E. Bishop, Veena Tikare, (2022). Simulating Additive Manufacturing with SPPARKS – process modeling for realistic 3D microstructures ASTM International Conference on Additive Manufacturing Document ID: 1494039

J. (LLNL)-ext Lind, Quint (LLNL)-ext, Brittany Ann Branch, Stewart A. Silling, John A. Mitchell, B. (KCNSC)-ext Brown, W. W. (LANL)-ext Anderson, V. (LANL)-ext Anghel, J. S. (LANL)-ext Carpenter, (2022). Microstructural features informing continuum scale dynamic behavior of an additively manufactured titanium alloy 22nd Biennial Conference of the APS Topical Group on Shock Compression of Condensed Matter (SHOCK21) Document ID: 1482079

Theron Rodgers, Robert Moore, John A. Mitchell, Jeremy Trageser, Daniel Moser, Fadi Abdeljawad, Jonathan D Madison, (2022). Recent Advancements in SPPARKS Metal Additive Manufacturing Simulation Capabilities TMS 2022 Annual Meeting & Exhibition Document ID: 1470613

Mary Arnhart, Andrew Polonsky, Thomas Ivanoff, John A. Mitchell, Daryl Dagel, Jonathan D Madison, Bradley Howell Jared, (2022). In-situ Pyrometry As An Indicator For Defects In Addivitely Manufactured Metals – Revisited Tms Document ID: 1470788

Brittany Ann Branch, Timothy Ruggles, David G. Moore, John Carter Miers, Paul Elliott Specht, John A. Mitchell, Stewart A. Silling, Ben Brown, John Carpenter, (2022). Understanding microstructural effects of spallation in additively manufactured Ti-5Al-5V-5Mo-3Cr towards the development of a two-phase microstructurally aware model 22nd Biennial APS Shock Compression of Condensed Matter Conference Document ID: 1470864

Jeremy Trageser, John A. Mitchell, Theron Rodgers, (2021). Employing a Bezier curve model for simulating microstructure generation during the additive manufacturing process to inform microstructure aware material models World Congress on Computational Mechanics 2022 Document ID: 1392774

Stewart A. Silling, John A. Mitchell, (2021). Modeling Spall in Additively Manufactured Steel With Local-Nonlocal Coupling US National Congress on Computational Mechanics (USNCCM) Document ID: 1331660

Theron Rodgers, Robert Moore, John A. Mitchell, Jeremy Trageser, Daniel Moser, Fadi Abdeljawad, Jonathan D Madison, (2021). Recent Advancements in SPPARKS AM Simulation Capabilities TMS 2022 Annual Meeting and Exhibition Document ID: 1332014

Mary Arnhart, Andrew Polonsky, Thomas Ivanoff, John A. Mitchell, Bradley Howell Jared, Daryl Dagel, Jonathan D Madison, (2021). Two-color Pyrometry As A Defect Predictor In The Additive Manufacturing Of 316l Stailess Steel Tms 2022 Document ID: 1319397

Theron Rodgers, John A. Mitchell, Aaron Jeffrey Olson, Dan Stefan Bolintineanu, Andrew Vackel, Nathan W. Moore, (2021). Fast Three Dimensional Rules-Based Simulation of Thermal Sprayed Microstructures Computational Materials Science https://www.osti.gov/search/identifier:1781556 Document ID: 1281103

Theron Rodgers, Fadi Abdeljawad, Daniel Moser, Olivia De’Haven Underwood Jackson, Jay D. Carroll, Bradley Howell Jared, Dan Stefan Bolintineanu, John A. Mitchell, Jonathan D Madison, (2021). Simulation of Powder Bed Metal Additive Manufacturing Microstructures with Coupled Finite Difference-Monte Carlo Method Additive Manufacturing https://www.osti.gov/search/identifier:1773289 Document ID: 1280917

Stewart A. Silling, John A. Mitchell, (2021). Modeling Spall in Additively Manufactured Steel With Local-Nonlocal Coupling US National Congress on Computational Mechanics (USNCCM) Document ID: 1267725

John A. Mitchell, Gerald Fredrick Lofstead, Jeremy Trageser, (2021). Stitching additive manufacturing SPPARKS microstructure simulations 16th U.S. National Congress on Computational Mechanics https://www.osti.gov/search/identifier:1844314 Document ID: 1267615

Jeremy Trageser, John A. Mitchell, (2020). A Bezier Curve Informed Melt Pool Geometry to Model Additive Manufacturing Microstructures Using SPPARKS https://www.osti.gov/search/identifier:1664647 Document ID: 1196427

Paul Elliott Specht, David P. Adams, John A. Mitchell, Justin Lee Brown, Brittany Ann Branch, Stewart A. Silling, Jack L. Wise, Donald Brown, Todd Palmer, (2020). Response of Wrought and Additively Manufactured 304L Stainless Steel at Mbar Stresses Z Fundamental Science Workshop https://www.osti.gov/search/identifier:1812161 Document ID: 1183233

Anh Tran, John A. Mitchell, Laura Painton Swiler, Timothy Michael Wildey, (2020). An active learning high-throughput microstructure calibration framework for solving inverse structure-process problems in materials informatics Acta Materialia https://www.osti.gov/search/identifier:1634790 Document ID: 1126840

Gerald Fredrick Lofstead, John A. Mitchell, Enze Chen, (2020). Stitch It Up: Using Progressive Data Storage to Scale Science 34th IEEE International Parallel and Distributed Processing Symposium https://www.osti.gov/search/identifier:1775061 Document ID: 1115562

Thomas Ivanoff, John A. Mitchell, Bradley Howell Jared, Daryl Dagel, Jonathan D Madison, Mary Arnhart, (2020). Defect Identification in the Additive Manufacturing of Metals using In-situ Pyrometry INMM 61st Annual Meeting Document ID: 1090547

Bradley Howell Jared, Jonathan D Madison, David J. Saiz, John A. Mitchell, Joshua Robert Koepke, Thomas Ivanoff, (2020). Linking Pyrometry to Porosity in AM metals AM cross-JOWOG https://www.osti.gov/search/identifier:1763169 Document ID: 1090107

Brittany Ann Branch, Jack L. Wise, Paul Elliott Specht, David M Adams, John A. Mitchell, (2019). Time-resolved imaging of shock deformation in additively manufactured 304L Stainless Steel Mach 2020 Document ID: 1068208

John A. Mitchell, Thomas Ivanoff, Daryl Dagel, Jonathan D Madison, Bradley Howell Jared, (2019). Linking Pyrometry to Porosity in Additively Manufactured Metals Additive Manufacturing https://www.osti.gov/search/identifier:1595013 Document ID: 1056571

Bradley Howell Jared, Joshua Robert Koepke, David J. Saiz, Michael Heiden, Brad Boyce, David Lee Damm, Christopher Hammetter, David G. Moore, Joshua Robbins, Shawn Christopher Stacy, Alexander S. Tappan, John A. Mitchell, Jonathan D Madison, Thomas Ivanoff, Daryl Dagel, (2019). AM cross-JOWOG abstract titles AM cross-JOWOG Document ID: 1054115

Bradley Howell Jared, Jonathan D Madison, John A. Mitchell, David J. Saiz, Joshua Robert Koepke, Daryl Dagel, Thomas Ivanoff, (2019). Detecting Process Defects in Laser-Powder Bed Fusion American Society for Precision Engineering Annual Meetinng https://www.osti.gov/search/identifier:1643040 Document ID: 1054454

Paul Elliott Specht, John A. Mitchell, David P. Adams, Justin Lee Brown, Stewart A. Silling, Jack L. Wise, Todd Palmer, (2019). Shortening the Design and Certification Cycle for Additively Manufactured Materials by Improved Mesoscale Simulations and Validation Experiments: Fiscal Year 2019 Status Report https://www.osti.gov/search/identifier:1570554 Document ID: 1031600

Veena Tikare, Theron Rodgers, Jonathan D Madison, John A. Mitchell, (2019). Simulation of Metal Additive Manufacturing Process Thermec 2020 Document ID: 1032266

Thomas Ivanoff, Jonathan D Madison, John A. Mitchell, Daryl Dagel, Bradley Howell Jared, (2019). Correlation of Porosity Defects with In-situ Pyrometry in AM 316L SS Materials Science and Technology Annual Meeting (MS&T 2019) https://www.osti.gov/search/identifier:1642630 Document ID: 1031514

John A. Mitchell, (2019). An Approach to Upscaling SPPARKS Generated Synthetic Microstructures of Additively Manufactured Metals https://www.osti.gov/search/identifier:1568985 Document ID: 1020396

Bradley Howell Jared, John A. Mitchell, David J. Saiz, Jonathan D Madison, Thomas Ivanoff, Joshua Robert Koepke, Daryl Dagel, (2019). Detecting Process Defects in Laser-Powder Bed Fusion American Society for Precision Engineering Annual Meetinng Document ID: 1020347

Bradley Howell Jared, John A. Mitchell, Thomas Ivanoff, David J. Saiz, Joshua Robert Koepke, Jonathan D Madison, Laura Swiler, (2019). Defect Detection in Metal Additive Manufacturing Through Application of In-Situ Diagnostics Solid Freeform Fabrication https://www.osti.gov/search/identifier:1641629 Document ID: 998108

Thomas Ivanoff, Jonathan D Madison, John A. Mitchell, Sharlotte LorraineBolyard Kramer, Olivia De’Haven Underwood Jackson, Daryl Dagel, Bradley Howell Jared, Lisa Anne Deibler, (2019). Investigations of Advanced Materials: Additively Manufactured Metals, Thermal Spray Coatings and Explosive Welding Los Alamos National Laboratory Postdoc Research Symposium Document ID: 996712

John A. Mitchell, Thomas Ivanoff, Daryl Dagel, Bradley Howell Jared, Joshua Robert Koepke, David J. Saiz, Laura Painton Swiler, (2019). Linking pyrometry to porosity in additive manufactured metals Solid Freeform Fabrication Symposium https://www.osti.gov/search/identifier:1641333 Document ID: 996557

Jonathan D Madison, Theron Rodgers, John A. Mitchell, Hojun Lim, Corbett C. Battaile, Kyle N. Karlson, Alyssa Jennifer Skulborstad, Maher Salloum, (2019). Materials Margins Assurance: Incorporating Material Variability in Simulation Tools and Code 5th World Congress on Integrated Computational Materials Engineering (ICME 2019) https://www.osti.gov/search/identifier:1641377 Document ID: 996605

Bradley Howell Jared, John A. Mitchell, David J. Saiz, Jonathan D Madison, Thomas Ivanoff, Joshua Robert Koepke, Daryl Dagel, (2019). Detecting Process Defects in Laser-Powder Bed Fusion American Society for Precision Engineering Annual Meetinng Document ID: 986442

Jonathan D Madison, Thomas Ivanoff, John A. Mitchell, Daryl Dagel, Joshua Robert Koepke, David J. Saiz, Bradley Howell Jared, (2019). High Value Pyrometry-To-Defect Correspondence in Laser Powder Bed Fusion of 316L Stainless Steel Gordon Research Conference on Physical Metallurgy https://www.osti.gov/search/identifier:1641111 Document ID: 985330

Paul Elliott Specht, Stewart A. Silling, John A. Mitchell, Corbett C. Battaile, Justin Lee Brown, Jack L. Wise, David P. Adams, Donald Brown, Todd Palmer, Joseph R. Michael, Michael P. Saavedra, (2019). Shortening the Design and Certification Cycle for Additively Manufactured Materials by Improved Mesoscale Simulations and Validation Experiments Radiation Effects and High Energy Density Sciences (REHEDS) review https://www.osti.gov/search/identifier:1645212 Document ID: 960831

Jonathan D Madison, Thomas Ivanoff, John A. Mitchell, Daryl Dagel, Joshua Robert Koepke, David J. Saiz, Bradley Howell Jared, (2019). High Value Pyrometry To Defect Correspondence In Laser Powder Bed Fusion Of 316l Stainless Steel Gordon Research Conference Document ID: 959772

Thomas Ivanoff, Jonathan D Madison, John A. Mitchell, Joshua Robert Koepke, Daryl Dagel, Bradley Howell Jared, (2019). Correlation of Porosity Defects with In-situ Pyrometry in AM 316L Stainless Steel Materials Science and Technology Annual Meeting (MS&T 2019) Document ID: 948454

Theron Rodgers, Daniel Moser, Fadi F. Abdeljawad, Mario J. Martinez, Kurtis Ross Ford, Bradley Trembacki, Kyle Johnson, John A. Mitchell, Jonathan D Madison, (2019). Calibrated Monte Carlo Models of Microstructure Evolution for Additive Manufacturing TMS 2019 Annual Meeting https://www.osti.gov/search/identifier:1639467 Document ID: 936600

Jonathan D Madison, Daryl Dagel, Thomas Ivanoff, Bradley Howell Jared, Joshua Robert Koepke, John A. Mitchell, David J. Saiz, Laura Painton Swiler, (2019). Defect Signatures for Metal Laser Powder-Bed Fusion Tms 2019 https://www.osti.gov/search/identifier:1639421 Document ID: 936366

Bradley Howell Jared, Jonathan D Madison, Thomas Ivanoff, Laura Painton Swiler, David J. Saiz, Daryl Dagel, John A. Mitchell, Joshua Robert Koepke, (2019). Defect Detection in Metal Additive Manufacturing Through Application of In-Situ Diagnostics Tms https://www.osti.gov/search/identifier:1639391 Document ID: 936508

John A. Mitchell, Thomas Ivanoff, Jonathan D Madison, Daryl Dagel, Bradley Howell Jared, (2019). Linking in-situ pyrometry to pores TMS2019148th Annual Meeting and Exhibition https://www.osti.gov/search/identifier:1639339 Document ID: 936361

Paul Elliott Specht, David P. Adams, Stewart A. Silling, John A. Mitchell, Corbett C. Battaile, Justin Lee Brown, Jack L. Wise, Donald Brown, Todd Palmer, Joseph R. Michael, Michael P. Saavedra, (2019). Shortening the Design and Certification Cycle for Additively Manufactured Materials by Improved Mesoscale Simulations and Validation Experiments Stewardship Science Academic Programs (SSAP) Symposium https://www.osti.gov/search/identifier:1598928 Document ID: 913766

Jonathan D Madison, Theron Rodgers, Hojun Lim, John A. Mitchell, Corbett C. Battaile, Alyssa Jennifer Skulborstad, Maher Salloum, Alexander Anthony Hanson, John M Emery, (2019). MATERIALS MARGINS ASSURANCE : INCORPORATING MATERIAL VARIABILITY IN SIMULATION TOOLS & CODE 5th World Congress on Integrated Computational Materials & Engineering Document ID: 902139

Paul Elliott Specht, David M Adams, John A. Mitchell, Stewart A. Silling, Justin Lee Brown, Jack L. Wise, Donald Brown, Todd Palmer, (2018). Response of Wrought and Additively Manufactured 304L Stainless Steel Under High Pressure, High Strain-Rate Loading Joint US/Israeli workshop on High Energy Density Physics Document ID: 900248

Gerald Fredrick Lofstead, John A. Mitchell, (2018). Lazy, Minimal, Eventually Consistent IO with Stitch Pdsw-discs https://www.osti.gov/search/identifier:1592373 Document ID: 888914

Thomas Ivanoff, Jonathan D Madison, Joshua Robert Koepke, Erich Swaller, Bradley Howell Jared, John A. Mitchell, Laura Painton Swiler, (2018). 3D Registration of Structure, Melt Pool History and Design in AM 316L Stainless Steel Materials Science and Technology 2018 Document ID: 877526

Paul Elliott Specht, David P. Adams, John A. Mitchell, Stewart A. Silling, Justin Lee Brown, Jack L. Wise, Donald (LANL) Brown, Todd (PSU) Palmer, (2018). Response of Wrought and Additively Manufactured 304L Stainless Steel Under High Pressure, High Strain-Rate Loading Jowog 32 Mat https://www.osti.gov/search/identifier:1806931 Document ID: 877335

John A. Mitchell, (2018). Clustering to upscale microstructure morphologies Multiscale Material Modeling https://www.osti.gov/search/identifier:1806930 Document ID: 877013

Theron Rodgers, Daniel Moser, John A. Mitchell, Fadi F. Abdeljawad, Kyle Johnson, Mario J. Martinez, Jonathan D Madison, (2018). Recent Advances in Metal Additive Manufacturing Microstructure Simulation 4th AM Cross JOWOG Document ID: 854226

Thomas Ivanoff, Jonathan D Madison, Joshua Robert Koepke, Bradley Howell Jared, John A. Mitchell, Laura Painton Swiler, (2018). 3D Characterization of Porosity in AM 316L SS and its Effect on Mechanical Behavior Solid Freeform Fabrication Symposium https://www.osti.gov/search/identifier:1806770 Document ID: 842869

Thomas Ivanoff, Jonathan D Madison, Joshua Robert Koepke, Bradley Howell Jared, John A. Mitchell, Laura Painton Swiler, (2018). 3D Characterization of Porosity in AM 316L SS and its Effect on Mechanical Behavior Solid Freeform Fabrication Symposium https://www.osti.gov/search/identifier:1582148 Document ID: 842657

Theron Rodgers, Daniel Moser, John A. Mitchell, Fadi F. Abdeljawad, Mario J. Martinez, Kyle Johnson, Jonathan D Madison, (2018). Powder Bed Modeling Big and Small: Simulating Microstructural Evolution from a Single Bead to (Closer to) the Part Scale Solid Freeform Fabrication Symposium 2018 https://www.osti.gov/search/identifier:1582157 Document ID: 842720

Bradley Howell Jared, Jonathan D Madison, Thomas Ivanoff, John A. Mitchell, Erich James Schwaller, Joshua Robert Koepke, David J. Saiz, Daryl Dagel, Harlan James Brown-Shaklee, Laura Painton Swiler, (2018). Defect Signatures for Metal Laser Powder Bed Fusion Solid Freeform Fabrication https://www.osti.gov/search/identifier:1581712 Document ID: 842694

Veena Tikare, Joseph E. Bishop, David John Littlewood, Mario J. Martinez, John A. Mitchell, Joshua Robbins, Theron Rodgers, Bart G van Bloemen Waanders, (2018). The Role of High Performance Computing in Enabling Additive Manufacturing Tms 2019 Document ID: 831023

John A. Mitchell, (2018). Towards upscaling microstructural effects using data analytics WCCM 201813th World Congress on Computational Mechanics https://www.osti.gov/search/identifier:1806536 Document ID: 831101

Theron Rodgers, Daniel Moser, Fadi Abdeljawad, Mario J. Martinez, Kurtis Ross Ford, Bradley Trembacki, Kyle Johnson, John A. Mitchell, Jonathan D Madison, (2018). Calibrated Monte Carlo Models of Microstructure Evolution for Additive Manufacturing TMS Annual Meeting & Exhibition Document ID: 830923

Theron Rodgers, John A. Mitchell, Jonathan D Madison, (2018). Monte Carlo Simulation of Polycrystalline Additive Manufacturing Microstructures Society for Industrial and Applied Mathematics Mathematical Aspects of Materials Science Document ID: 830226

John A. Mitchell, Thomas Ivanoff, Daryl Dagel, Bradley Howell Jared, Jonathan D Madison, Laura Painton Swiler, David J. Saiz, Joshua Robert Koepke, (2018). Process analysis of powder bed AM using two color pyrometer data TMS2019148th Annual Meeting and Exhibition Document ID: 830195

Bradley Howell Jared, Jonathan D Madison, Laura Painton Swiler, David J. Saiz, Joshua Robert Koepke, John A. Mitchell, Daryl Dagel, Thomas Ivanoff, (2018). Defect Signatures for Metal Laser Powder Bed Fusion Tms 2019 Document ID: 829921

Jonathan D Madison, Theron Rodgers, Thomas Ivanoff, Joseph E. Bishop, Bradley Howell Jared, Kyle Johnson, John A. Mitchell, Kurtis Ross Ford, Mario J. Martinez, Olivia De’Haven Underwood Jackson, (2018). Microstructural Predictions for Additive: Experiments & Simulations in 3D sharing results with an external collaboration Document ID: 819906

Sophia Lefantzi, Dan Stefan Bolintineanu, Jeremy B. Lechman, Jonathan D Madison, Mario J. Martinez, John A. Mitchell, Daniel Moser, David R. Noble, Theron Rodgers, (2018). Toward Validated Multiscale, Multiphysics Modeling for Additive Manufacturing Processes DOE AM Workshop https://www.osti.gov/search/identifier:1515726 Document ID: 807226

Paul Elliott Specht, Stewart A. Silling, John A. Mitchell, Corbett C. Battaile, Justin Lee Brown, Jack L. Wise, Michael D. Furnish, David P. Adams, Donald (LANL) Brown, Todd (PSU) Palmer, Joseph R. Michael, Michael P. Saavedra, (2018). Shortening the Design and Certification Cycle for Additively Manufactured Materials by Improved Mesoscale Simulations and Validation Experiments REHEDS External Program Review Document ID: 796173

Theron Rodgers, Daniel Moser, John A. Mitchell, Fadi F. Abdeljawad, Mario J. Martinez, Kyle Johnson, Jonathan D Madison, (2018). Powder Bed Modeling Big and Small: Simulating Microstructural Evolution from a Single Bead to (Closer to) the Part Scale Solid Freeform Fabrication Symposium Document ID: 785020

Thomas Ivanoff, Jonathan D Madison, Joshua Robert Koepke, Bradley Howell Jared, John A. Mitchell, Laura Painton Swiler, (2018). Three-Dimensional Characterization of Porosity Defects and their Correlation to Mechanical Properties in AM 316L Stainless Steel Solid Freeform Fabrication Symposium Document ID: 784810

Bradley Howell Jared, Jonathan D Madison, Thomas Ivanoff, John A. Mitchell, Erich James Schwaller, Joshua Robert Koepke, Laura Painton Swiler, David J. Saiz, Daryl Dagel, Harlan James Brown-Shaklee, (2018). Defect Signatures for Metal Laser Powder Bed Fusion Solid Freeform Fabrication Document ID: 784717

Theron Rodgers, John A. Mitchell, Jonathan D Madison, (2018). Monte Carlo Simulation of Polycrystalline Additive Manufacturing Microstructures SIAM Conference on Mathematical Aspects of Materials Science Document ID: 784356

Thomas Ivanoff, Jonathan D Madison, Joshua Robert Koepke, Erich James Schwaller, Bradley Howell Jared, John A. Mitchell, Laura Painton Swiler, (2018). Three-Dimensional Registration of Part Design, Melt Pool History and Resultant Structure in Additively Manufactured 316L Stainless Steel Materials Science & Technology Technical Meeting and Exhibition 2018 Document ID: 783839

John A. Mitchell, (2018). A local/nonlocal plasticity model for upscaling microstructural effects Multiscale Material Modeling https://www.osti.gov/search/identifier:1505276 Document ID: 783754

Bradley Howell Jared, Joshua Robert Koepke, David J. Saiz, Laura Painton Swiler, John A. Mitchell, Jonathan D Madison, Thomas Ivanoff, Kevin Webb, Jeffrey Rodelas, Erich James Schwaller, (2018). Defect Signatures for Metal Laser Powder Bed Fusion Tms 2018 https://www.osti.gov/search/identifier:1501973 Document ID: 772466

John A. Mitchell, (2017). Upscaling Microstructural Effects by Combining Local/Nonlocal Models WCCM 201813th World Congress on Computational Mechanics Document ID: 738419

Uzoma Onunkwo, Anand Ganti, John A. Mitchell, Michael Patrick Scoggin, Richard C. Schroeppel, Brian P. Van Leeuwen, Michael Wolf, (2017). High Fidelity Simulations of Large-scale Wireless Networks (Part II – FY2017) https://www.osti.gov/search/identifier:1489863 Document ID: 703904

Jonathan D Madison, Theron Rodgers, John A. Mitchell, Veena Tikare, (2017). SPPARKS – A Platform for Simulation of Material Microstructures + High Throughput Testing at Sandia National Laboratories visit to General Electric, Global Research Center Document ID: 692982

Theron Rodgers, John A. Mitchell, Veena Tikare, (2017). A Monte Carlo model for 3D grain evolution during welding Modelling and Simulation in Materials Science and Engineering https://www.osti.gov/search/identifier:1374751 Document ID: 637938

Theron Rodgers, Kyle Johnson, Judith Alice Brown, Fadi F. Abdeljawad, Jonathan D Madison, John A. Mitchell, Veena Tikare, (2017). Modeling Microstructure Evolution During Metal Additive Manufacturing Gordon Research Symposium on Physical Metallurgy https://www.osti.gov/search/identifier:1508469 Document ID: 638407

Theron Rodgers, Jonathan D Madison, John A. Mitchell, Veena Tikare, (2017). Numerical Simulation Of Microstructural Evolution During Additive Manufacturing Of Metals Computational Mechanics of Particle-Functionalized Fluid and Solid Materials for Additive Manufacturing and 3D Printing Processes https://www.osti.gov/search/identifier:1458098 Document ID: 625113

Theron Rodgers, Kyle Johnson, Judith Alice Brown, Fadi F. Abdeljawad, Jonathan D Madison, Joseph E. Bishop, John A. Mitchell, Veena Tikare, (2017). Modeling Microstructure Evolution During Metal Additive Manufacturing Physical Metallurgy Gordon Research Conference Document ID: 612543

Veena Tikare, Theron Rodgers, Jonathan D Madison, John A. Mitchell, (2017). Numerical Simulation of Microstructural Evolution during Additive Manufacturing of Metals Computational Mechanics of Particle-Functionalized Fluid and Solid Materials for Additive Manufacturing and 3D Printing Processes Document ID: 612996

John A. Mitchell, (2017). Grain Growth Modeling and Novel Data Analytics for Weld Process 2017 SIAM Conference on Computational Science and Engineering https://www.osti.gov/search/identifier:1425305 Document ID: 589156

John A. Mitchell, Stewart A. Silling, David John Littlewood, (2016). A Position-Aware Linear Solid Constitutive Model for Peridynamics Journal of Mechanics of Materials and Structures https://www.osti.gov/search/identifier:1338382 Document ID: 565591

Andrew R. Castillo, John A. Mitchell, Stephen D Bond, (2016). Using and Developing Novel Data Analytics for Digitalized Microstructures https://www.osti.gov/search/identifier:1762013 Document ID: 553983

John A. Mitchell, (2016). Potts model for grain growth during welding using SPPARKS 8th International Conference on Multiscale Materials Modeling https://www.osti.gov/search/identifier:1397119 Document ID: 530336

Veena Tikare, Andrew Castillo, Stephen D Bond, Jonathan D Madison, John A. Mitchell, Theron Rodgers, (2016). Methods for Quantitative Characterization of Microstructures NSF Workshop on Emerging Opportunities in Ceramics and Glass Science https://www.osti.gov/search/identifier:1392762 Document ID: 529621

John A. Mitchell, (2016). Grain Growth Modeling and Novel Data Analytics for Weld Process 2017 SIAM Conference on Computational Science and Engineering Document ID: 529646

John A. Mitchell, (2016). Novel Applica,on of Po0s Model for Grain Growth During Welding using SPPARKS 2016 SIAM Conference on Mathematical Aspects of Materials Science https://www.osti.gov/search/identifier:1365319 Document ID: 442351

John A. Mitchell, Veena Tikare, (2016). Novel Application of Potts Model for Grain Growth During Welding using SPPARKS 8th International Conference on Multiscale Materials Modeling Document ID: 397617

Eunja Kim, Philippe F Weck, Veena Tikare, Frederic Poineau, Kenneth Czerwinski, John A. Mitchell, (2016). First-principles study of mechanical properties of zirconium alloys and zirconium hydrides 2016 ANS Annual Meeting Document ID: 376616

David John Littlewood, John A. Mitchell, Aidan P. Thompson, (2015). Materials Modeling Capabiities Joint Sandia-Georgia Tech Materials Focus Area Kick-Off Meeting https://www.osti.gov/search/identifier:1340213 Document ID: 365466

John A. Mitchell, Veena Tikare, (2015). Novel Application of Potts Model for Grain Growth During Welding using SPPARKS 2016 SIAM Conference on Mathematical Aspects of Materials Science Document ID: 365694

John A. Mitchell, (2015). Ordinary, Isotropic Constitutive Models for Peridynamics Nonlocal Models in Mathematics, Computation, Science, and Engineering https://www.osti.gov/search/identifier:1506748 Document ID: 343294

John A. Mitchell, Veena Tikare, Philippe F Weck, (2015). Towards Using Eshelby Calculations to Enhance Kinetic Model for Zirconium Hydride Precipitation https://www.osti.gov/search/identifier:1504854 Document ID: 341675

John A. Mitchell, Theron Rodgers, (2015). Distributed-Parallel Kinetic Monte Carlo Modeling for Grain Growth 17th SIAM Conference on Parallel Processing for Scientific Computing Document ID: 342670

Veena Tikare, Philippe F Weck, John A. Mitchell, (2015). Modeling of hydride precipitation and re-orientation https://www.osti.gov/search/identifier:1332940 Document ID: 341898

David John Littlewood, Stewart A. Silling, John A. Mitchell, Pablo D. (ORNL) Seleson, Stephen D Bond, Michael L. Parks, Daniel Z. Turner, Damon J. Burnett, Jakob Ostien, Max (FSU) Gunzburger, (2015). Strong Local-Nonlocal Coupling for Integrated Fracture Modeling https://www.osti.gov/search/identifier:1221526 Document ID: 321749

Philippe F Weck, Eunja Kim, Veena Tikare, John A. Mitchell, (2015). Mechanical properties of zirconium alloys and zirconium hydrides predicted from density functional perturbation theory CrystEngComm https://www.osti.gov/search/identifier:1259850 Document ID: 319842

David John Littlewood, Stewart A. Silling, Pablo Seleson, John A. Mitchell, (2015). Coupling Approaches for Integrating Meshfree Peridynamic Models with Classical Finite Element Analysis 13th US National Congress on Computational Mechanics https://www.osti.gov/search/identifier:1339330 Document ID: 318790

John A. Mitchell, (2015). Ordinary, Isotropic Constitutive Models for Peridynamics Nonlocal Models in Mathematics, Computation, Science, and Engineering Document ID: 307861

John A. Mitchell, (2015). Ordinary Isotropic Peridynamic Models: Position Aware Viscoelastic(PAVE) 1st Pan-american Congress on Computational Mechanics https://www.osti.gov/search/identifier:1249043 Document ID: 264574

John A. Mitchell, Veena Tikare, (2015). Numerical Simulation of Ni Grain Growth in a Thermal Gradient SIAM Conference on Computational Science and Engineering https://www.osti.gov/search/identifier:1246844 Document ID: 232419

Andrew David Baczewski, Adam (UW Madison) Frees, John King Gamble, Xujiao Gao, Noah Tobias Jacobson, John A. Mitchell, Ines Montano, Richard P. Muller, Erik Nielsen, (2015). Device-Level Models Using Multi-Valley Effective Mass APS March Meeting 2015 https://www.osti.gov/search/identifier:1240116 Document ID: 221886

John A. Mitchell, (2015). Ordinary Isotropic Peridynamic Models; Position Aware Linear Solid (PALS) Telecon seminar with personnel at Corning corporation https://www.osti.gov/search/identifier:1239086 Document ID: 221492

John A. Mitchell, (2015). Verification and Validation Studies of Ordinary Peridynamic Solid Models 13th US National Congress on Computational Mechanics Document ID: 221336

Richard P. Muller, John B. Aidun, Andrew David Baczewski, Xujiao Gao, Tzvetan S. Metodi, John A. Mitchell, Jonathan David Sterk, John King Gamble, Robin J Blume-Kohout, Noah Tobias Jacobson, (2015). Silicon Qubits By Design Quantum Noise and Model Reduction Workshop https://www.osti.gov/search/identifier:1244872 Document ID: 220023

John A. Mitchell, Veena Tikare, (2014). Numerical Simulation of Ni Grain Growth in a Thermal Gradient SIAM Conference on Computational Science and Engineering https://www.osti.gov/search/identifier:1315397 Document ID: 219380

John A. Mitchell, (2014). Peridynamics, Ordinary Isotropic Plasticity Model ASME 2014 International Mechanical Engineering Congress & Exposition https://www.osti.gov/search/identifier:1367575 Document ID: 208461

Andrew David Baczewski, Adam Frees, John King Gamble, Xujiao Gao, Noah Tobias Jacobson, John A. Mitchell, Ines Montano, Richard P. Muller, Erik Nielsen, (2014). Device-Level Models Using Multi-Valley Effective Mass APS March Meeting 2015 Document ID: 207895

David John Littlewood, Stewart A. Silling, Pablo D. Seleson, John A. Mitchell, (2014). Coupling Approaches for Integrating Meshfree Peridynamic Models with Classical Finite Element Analysis 1st Pan-American Congress on Computational Mechanics Document ID: 207888

David John Littlewood, Stewart A. Silling, Pablo D Seleson, John A. Mitchell, (2014). Integrating Meshfree Peridynamic Models with Classical Finite Element Analysis Meshfree Methods for Large-Scale Computational Science and Engineering https://www.osti.gov/search/identifier:1242046 Document ID: 197538

John A. Mitchell, (2014). On a Position Aware Viscoelastic (PAVE) Model for Peridynamics Panacm 2015 Document ID: 166281

John A. Mitchell, Stewart A. Silling, David John Littlewood, (2014). A Position-Aware Linear Solid Constitutive Model for Peridynamics Journal of Mechanics of Materials and Structures https://www.osti.gov/search/identifier:1497668 Document ID: 176523

John A. Mitchell, (2014). A Simple One Step Line Search For Use in Quasi-static Solid Mechanics Contact Calculations 7th Annual US National Congress On Computational Mechanics https://www.osti.gov/search/identifier:1502170 Document ID: 144172

David John Littlewood, Stewart A. Silling, Pablo D. Seleson, John A. Mitchell, (2014). Integrating Meshfree Peridynamic Models with Classical Finite Element Analysis Workshop for Meshfree Methods for Large-Scale Computational Science and Engineering Document ID: 143609

Stewart A. Silling, John A. Mitchell, (2014). Unifying the mechanics of continua, cracks, and particles Seminar at 3M Corp. https://www.osti.gov/search/identifier:1496960 Document ID: 143453

John A. Mitchell, Stewart A. Silling, David John Littlewood, (2014). Ordinary Isotropic Peridynamic Models\\ Position Aware Linear Solid (PALS) US National Congress Theoretical and Applied Mechanics https://www.osti.gov/search/identifier:1497522 Document ID: 101543

David John Littlewood, Stewart A. Silling, John A. Mitchell, Michael L. Parks, Jakob Ostien, Daniel Z. Turner, P.D. Seleson, M. Gunzburger, (2014). Coupling Peridynamics and Classical Finite Element Analysis for Integrated Fracture Modeling Cis Erb Document ID: 5336016

David John Littlewood, Stewart A. Silling, Richard B. Lehoucq, Michael L. Parks, John A. Mitchell, Daniel Z. Turner, Stephen D Bond, (2014). Peridynamic Modeling of Material Failure and Fracture Cis Eab https://www.osti.gov/search/identifier:1706390 Document ID: 5335185

Michael L. Parks, David John Littlewood, John A. Mitchell, Stewart A. Silling, Daniel Z. Turner, John Foster, Chris Lammi, (2013). Peridigm: A New Paradigm in Computational Peridynamics SIAM Conference on Analysis of Partial Differential Equations https://www.osti.gov/search/identifier:1673906 Document ID: 5330728

David John Littlewood, Michael L. Parks, John A. Mitchell, Stewart A. Silling, (2013). The Peridigm Framework for Peridynamic Simulations U.S. National Congress on Computational Mechanics https://www.osti.gov/search/identifier:1106141 Document ID: 5325229

Michael L. Parks, David John Littlewood, John A. Mitchell, Stewart A. Silling, John Foster, Dan Turner, (2013). Peridigm: A New Paradigm in Computational Peridynamics SIAM Conference on Mathematical Aspects of Materials Science https://www.osti.gov/search/identifier:1661360 Document ID: 5323435

Michael L. Parks, David John Littlewood, John A. Mitchell, Stewart A. Silling, (2013). Peridigm: A New Paradigm in Computational Peridynamics Workshop on Nonlocal Damage and Failure https://www.osti.gov/search/identifier:1657016 Document ID: 5319680

David John Littlewood, Michael L. Parks, John A. Mitchell, Stewart A. Silling, (2013). The Peridigm Framework for Peridynamic Simulations U.S. National Congress on Computational Mechanics https://www.osti.gov/search/identifier:1062955 Document ID: 5318561

Michael L. Parks, David John Littlewood, John A. Mitchell, Stewart A. Silling, (2013). Computational Peridynamics 2013 Joint Mathematics Meetings https://www.osti.gov/search/identifier:1649818 Document ID: 5317135

Michael L. Parks, David John Littlewood, John A. Mitchell, Stewart A. Silling, Richard B. Lehoucq, (2012). Peridynamics for Material Failure Nuclear Explosive Code Development Conference https://www.osti.gov/search/identifier:1648018 Document ID: 5313636

Michael L. Parks, David John Littlewood, John A. Mitchell, Stewart A. Silling, (2012). Peridigm Users Guide v1.0.0 https://www.osti.gov/search/identifier:1055619 Document ID: 5313055

Michael L. Parks, David John Littlewood, Stewart A. Silling, Richard B. Lehoucq, John A. Mitchell, (2012). Peridynamics for Material Failure Presentation at LANL https://www.osti.gov/search/identifier:1656996 Document ID: 5306672

Michael L. Parks, David John Littlewood, Andrew G. Salinger, John A. Mitchell, (2011). Peridigm Summary Report: Lessons Learned in Development with Agile Components https://www.osti.gov/search/identifier:1029829 Document ID: 5299879

Jonathan W. Wittwer, Michael Baker, John A. Mitchell, David Epp, Rebecca C. Clemens, Matthew Robert Brake, Jeremy A. Walraven, (2008). The Sandia MEMS Passive Shock Sensor: FY08 Design Summary https://www.osti.gov/search/identifier:945193 Document ID: 5265772

David Epp, Jill Blecke, Matthew Robert Brake, Michael Baker, Jonathan W. Wittwer, Rebecca C. Clemens, John A. Mitchell, Jeremy A. Walraven, (2008). The Sandia MEMS Passive Shock Sensor: FY08 Testing for Functionality, Model Velidation, and Technology Readiness https://www.osti.gov/search/identifier:943322 Document ID: 5265663

Jeremy A. Walraven, Michael Baker, Jonathan W. Wittwer, David Epp, Matthew Robert Brake, Rebecca C. Clemens, John A. Mitchell, (2008). The Sandia MEMS Passive Shock Sensor: FY08 Failure Analysis Activities https://www.osti.gov/search/identifier:939847 Document ID: 5264244

Michael Baker, John A. Mitchell, David Epp, (2008). MEMS Passive Latching Mechanical Shock Sensor Idetc 2008 https://www.osti.gov/search/identifier:1143218 Document ID: 5264112

Mary Anna McWherter-Payne, Michael Baker, Jason R. Brown, Blake E. Jakaboski, John A. Mitchell, Steven M. Thornberg, Richard W. Wavrik, MICHAEL I. WHITE, (2007). Impact of Die Adhesives on MEMS Reliability Components for military and space electronics https://www.osti.gov/search/identifier:1146318 Document ID: 5258390

David Epp, John A. Mitchell, Hartono Sumali, Jonathan W. Wittwer, (2007). Measuring Eddy Current Damping of a Meso-Scale Spring-Mass Structure International Modal Analysis Conference https://www.osti.gov/search/identifier:902585 Document ID: 5239253

Jonathan S. Custer, John A. Mitchell, (2006). On the Integration of Technology Readiness Levels at Sandia National Laboratories https://www.osti.gov/search/identifier:893160 Document ID: 5245976

Dwayne L. Knirk, John A. Mitchell, (2002). On the Treatment of Multiple Contact Constraints at a Node in an Explicit Enforcement Algorithm WCCM V – Fifth World Congress on Computational Mechanics https://www.osti.gov/search/identifier:893160 Document ID: 4290900

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