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Constitutive Strength Modeling

National Laboratories:Los Alamos
Characterization:Mechanical Behavior of Materials
Computational Tools:Structure-Properties

Los Alamos National Laboratory’s Dynamic and Quasi-static Experimental Team has long-standing expertise in the development of fully parameterized Johnson-Cook, Zerilli-Armstrong, and mechanical threshold strength (MTS) model fits for materials, which includes the in-house ability to perform a full suite of mechanical tests required for the fits (over strain rates of 10-3–4000/s and temperatures of 77–1273 K). In addition, a proven capability for sheet materials has been developed on sheet-steel alloys, and model validation is available.

Capability Bounds

Typically, materials are tested in quantities of cm3, in ASTM, or other standard laboratory test platform geometries.

Unique Aspects

Unique attributes of this facility include a diverse range of environments (strain rate and temperature) that can be explored for a robust constitutive model via multiple platforms in one facility, as well as a highly collaborative team of modelers and experimentalists who have worked together for more than 20 years.


Facility use is coordinated with the capability expert, and flexible scheduling is possible.


  • Shuh Rong Chen and G.T. Gray III: Metallurgical and Materials Transactions A, 27A (1996), pp. 2994-3006. “Constitutive Behavior of Tantalum and Tantalum-Tungsten Alloys”
  • C.M. Cady, S-R, Chen, G.T. Gray III, D.A. Korzekwa, and J.F. Bingert: Metallurgical and Materials Transactions A, (2000) vol. 31A, pp. 2439-2448. "Dynamic Materials Testing, Texture, and Yield Surface Calculation of an Automotive Sheet Steel"
  • P.J. Maudlin, J.F. Bingert, and G.T. Gray III: Int. J. Plasticity (2003) vol. 19, pp. 483-515. “Low-Symmetry Plastic Deformation in BCC Tantalum: Experimental Observations, Modeling and Simulations”

Information Link(s)


George (Rusty) T. Gray III