Predicting Performance Margins

Predicting Performance Margins

  • Texture density plots

    EBSD measurements and CP-FEM predictions of tantalum oligocrystal.

    Texture density plots
  • Strain field

    A comparison of measured and predicted surface strain fields at 4.3% applied strain.

    Strain field
  • Grain boundary structure

    Atomic-resolution image of a grain boundary structure in iron

    Grain Boundary
  • Modeling Material Response

    Stress field for homogenized I-Beam in torsion

    I-Beam in torsion
  • Modeling Material Response

    Stress field with grains explicitly resolved using DNS for an I-Beam in torsion

    DNS for I-Beam in torsion
  • Modeling Material Response

    Strain field for homogenized tube under tensile-torsion loading

    Tube under tensile-torsion loading
  • Modeling Material Response

    Strain field with grains explicity resolved using DNS for an I-Beam in tensile-torsion

    DNS for an I-Beam in tensile-torsion

Mission

Predicting Performance Margins (PPM) is a multi-disciplinary team that was created as an effort to integrate the many different areas of Materials Sciences, leveraging both experimental and modeling expertise at Sandia. The PPM project goal is to provide a science-based, probabilistic underpinning for design and analysis capabilities that links microstructure differences to macro-scale property variability.

Issue

One of the challenges at Sandia National Laboratories is addressing the issue of predictively connecting the macroscopic properties of metals to their micro– and nanostructures. While this issue may seem straightforward, it is anything but trivial. Materials are intrinsically inhomogeneous, and consequently, the specific relationship between microstructural variability and resulting properties and performance is often unknown.

Approach

PPM is comprised  of a group of multidisciplinary staff, post-docs, and university collaborators.  These individuals are dedicated to addressing major gaps in material science understanding in compelling and high-stakes mission-driven work.  Staff from different centers  actively seek science-based, probabilistic underpinnings which will provide much needed links between material  variability and material performance.   These centers include Physical, Chemical, Materials Science, Engineering Science,  and Nano Science across both Sandia New Mexico and Sandia California sites.

Initial PPM efforts have focused largely on development  of tools and insight  towards ensuring the mechanical safety of welded components.  The major benefit of the PPM approach is that it is a bellwether program designed to enable the core theme of the strategic investigation of material variability and then expand this same framework into many other topics, arenas, and materials needs.

PPM Factsheet

For more information, please contact:

Amy Sun, Program Manager, acsun@sandia.gov
Brad Boyce, Principal Investigator, blboyce@sandia.gov
Corbett Battaile, Co-Principal Investigator, ccbatta@sandia.gov 

Page Contact
:
Sandra O'Canna, snocann@sandia.gov