Publications

Kramer, Sharlotte L.; Bolintineanu, Dan S.; Long, Kevin N.; Hamel, Craig H.; Frankel, Ari L.; Jones, Reese E.; Swiler, Laura P.; Johnson, Kyle J.

Abstract not provided.

Littlewood, David J.; Jones, Reese E.; Plews, Julia A.; Hetmaniuk, Ulrich L.; Lifflander, Jonathan

Abstract not provided.

World Congress in Computational Mechanics and ECCOMAS Congress

Littlewood, David J.; Jones, Reese E.; Morales, Nicolas M.; Plews, Julia A.; Hetmaniuk, Ulrich; Lifflander, Jonathan J.

Software development for high-performance scientific computing continues to evolve in response to increased parallelism and the advent of on-node accelerators, in particular GPUs. While these hardware advancements have the potential to significantly reduce turnaround times, they also present implementation and design challenges for engineering codes. We investigate the use of two strategies to mitigate these challenges: the Kokkos library for performance portability across disparate architectures, and the DARMA/vt library for asynchronous many-task scheduling. We investigate the application of Kokkos within the NimbleSM finite element code and the LAMÉ constitutive model library. We explore the performance of DARMA/vt applied to NimbleSM contact mechanics algorithms. Software engineering strategies are discussed, followed by performance analyses of relevant solid mechanics simulations which demonstrate the promise of Kokkos and DARMA/vt for accelerated engineering simulators.

Littlewood, David J.; Plews, Julia A.; Morales, Nicolas M.; Jones, Reese E.

Abstract not provided.

Materials Science and Engineering: A

Heckman, Nathan H.; Ivanoff, Thomas I.; Roach, Ashley M.; Jared, Bradley H.; Tung, Daniel J.; Brown-Shaklee, Harlan J.; Huber, Todd H.; Saiz, David J.; Koepke, Joshua R.; Rodelas, Jeffrey R.; Madison, Jonathan D.; Salzbrenner, Bradley S.; Swiler, Laura P.; Jones, Reese E.; Boyce, Brad B.

The mechanical properties of additively manufactured metals tend to show high variability, due largely to the stochastic nature of defect formation during the printing process. This study seeks to understand how automated high throughput testing can be utilized to understand the variable nature of additively manufactured metals at different print conditions, and to allow for statistically meaningful analysis. This is demonstrated by analyzing how different processing parameters, including laser power, scan velocity, and scan pattern, influence the tensile behavior of additively manufactured stainless steel 316L utilizing a newly developed automated test methodology. Microstructural characterization through computed tomography and electron backscatter diffraction is used to understand some of the observed trends in mechanical behavior. Specifically, grain size and morphology are shown to depend on processing parameters and influence the observed mechanical behavior. In the current study, laser-powder bed fusion, also known as selective laser melting or direct metal laser sintering, is shown to produce 316L over a wide processing range without substantial detrimental effect on the tensile properties. Ultimate tensile strengths above 600 MPa, which are greater than that for typical wrought annealed 316L with similar grain sizes, and elongations to failure greater than 40% were observed. It is demonstrated that this process has little sensitivity to minor intentional or unintentional variations in laser velocity and power.

Kramer, Sharlotte L.; Bolintineanu, Dan S.; Long, Kevin N.; Waymel, Robert W.; Quintana, Enrico C.; Jones, Reese E.; Roberts, Scott A.; Newcomer, Justin T.; Stracuzzi, David J.; Swiler, Laura P.

Abstract not provided.

Jones, Reese E.; Rimsza, Jessica R.; Littlewood, David J.; LaForce, Tara

Abstract not provided.

Littlewood, David J.; Rimsza, Jessica R.; Frederick, Jennifer M.; Jones, Reese E.; LaForce, Tara

Abstract not provided.

Bochev, Pavel B.; Collis, Samuel S.; Jones, Reese E.; Lehoucq, Richard B.; Parks, Michael L.; Scovazzi, Guglielmo S.; Silling, Stewart A.; Templeton, Jeremy A.

This report is a collection of documents written as part of the Laboratory Directed Research and Development (LDRD) project A Mathematical Framework for Multiscale Science and Engineering: The Variational Multiscale Method and Interscale Transfer Operators. We present developments in two categories of multiscale mathematics and analysis. The first, continuum-to-continuum (CtC) multiscale, includes problems that allow application of the same continuum model at all scales with the primary barrier to simulation being computing resources. The second, atomistic-to-continuum (AtC) multiscale, represents applications where detailed physics at the atomistic or molecular level must be simulated to resolve the small scales, but the effect on and coupling to the continuum level is frequently unclear.

Jones, Reese E.; Templeton, Jeremy A.; Parks, Michael L.; Lehoucq, Richard B.; Olmsted, David L.

Abstract not provided.

Jones, Reese E.; Parks, Michael L.; Slepoy, Alexander S.; Lehoucq, Richard B.

Abstract not provided.

Brown, Kevin H.; Brown, Kevin H.; Voth, Thomas E.; Glass, Micheal W.; Gullerud, Arne S.; Heinstein, Martin W.; Jones, Reese E.

An effort is underway at Sandia National Laboratories to develop a library of algorithms to search for potential interactions between surfaces represented by analytic and discretized topological entities. This effort is also developing algorithms to determine forces due to these interactions for transient dynamics applications. This document describes the Application Programming Interface (API) for the ACME (Algorithms for Contact in a Multiphysics Environment) library.

Brown, Kevin H.; Summers, Randall M.; Glass, Micheal W.; Gullerud, Arne S.; Heinstein, Martin W.; Jones, Reese E.; Summers, Randall M.

An effort is underway at Sandia National Laboratories to develop a library of algorithms to search for potential interactions between surfaces represented by analytic and discretized topological entities. This effort is also developing algorithms to determine forces due to these interactions for transient dynamics applications. This document describes the Application Programming Interface (API) for the ACME (Algorithms for Contact in a Multiphysics Environment) library.

Brown, Kevin H.; Glass, Micheal W.; Gullerud, Arne S.; Heinstein, Martin W.; Jones, Reese E.; Summers, Randall M.

An effort is underway at Sandia National Laboratories to develop a library of algorithms to search for potential interactions between surfaces represented by analytic and discretized topological entities. This effort is also developing algorithms to determine forces due to these interactions for transient dynamics applications. This document describes the Application Programming Interface (API) for the ACME (Algorithms for Contact in a Multiphysics Environment) library.