APPLICATION OF THE PLASTICITY MODELS THAT INVOLVE THREE STRESS INVARIANTS

摘要: Increasing experimental evidence shows that the classical J2 plasticity theory may not fully describe plastic response of many materials, including some metallic alloys. In this paper, effect stress state on and general forms yield function flow potential for isotropic materials are assumed to be functions first invariant tensor (I1) second third invariants deviatoric (J2 J3). A 5083 aluminum alloy, Nitronic 40 (a stainless steel), Zircaloy-4 zirconium alloy) were tested under tension, compression, torsion, combined torsion–tension torsion–compression at room temperature demonstrate applicability a proposed I1-J2-J3 dependent model. The model was implemented in ABAQUS via user defined subroutine. parameters determined validated by comparing numerically predicted experimentally measured load versus displacement and/or torque twist angle curves. results showed incorporating dependence produced output matched data more closely than loading conditions tested.