Modeling of Anisotropic Inelastic Behavior

Nikkel, D.J. ; Nath, D.S. ; Brown, A.A. ; Casey, J.

Lawrence Livermore National Laboratory

关键词: Lawrence Livermore National Laboratory;    Plasticity;    Elasticity;    Plastics;    Materials;   

DOI  :  10.2172/793453
RP-ID  :  UCRL-ID-137748
RP-ID  :  W-7405-Eng-48
RP-ID  :  793453

美国|英语

来源: UNT Digital Library

【 摘 要 】

An experimental capability, developed at Lawrence Livermore National Laboratory (LLNL), is being used to study the yield behavior of elastic-plastic materials. The objective of our research is to develop better constitutive equations for polycrystalline metals. We are experimentally determining the multidimensional yield surface of the material, both in its initial state and as it evolves during large inelastic deformations. These experiments provide a more complete picture of material behavior than can be obtained from traditional uniaxial tests. Experimental results show that actual material response can differ significantly from that predicted by simple idealized models. These results are being used to develop improved constitutive models of anisotropic plasticity for use in continuum computer codes.