Constitutive Strength Modeling

National Laboratory: 
Los Alamos National Laboratory
Characterization Class: 
Mechanical Behavior of Materials
Computational Tools Class: 
Structure-Properties
Description: 

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.

Availability: 

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

Single Point of Contact: 

Name: George (Rusty) T. Gray III
Email: rusty@lanl.gov
Phone: 505-667-5452

References: 
  1. 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”
  2. 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"
  3. 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”
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