SA-12-2(105) Modeling of rate dependence and creep using VBO with a minimum number of constants(Inelastic Modeling & Analysis 2)

概要

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The modeling of the inelastic deformation behavior of metals and alloys is discussed with special emphasis on the unified viscoplasticity theory based on overstress (VBO) in its simplest form. It represents nonlinear rate sensitivity, creep, relaxation as well as cyclic neutral, hardening or softening behavior. The low homologous version is obtained from the high homologous temperature version by specialization. The room temperature rate dependence of a Ta-2.5 W alloy is easily modeled. However, additional tests, such as "cold" creep or relaxation tests are needed to uniquely determine the constants. For "hot" creep the effects of diffusion must be considered. VBO has two repositories for modeling this influence, the static recovery term and softening of the isotropic stress. Their combined actions enable the modeling of primary, secondary and tertiary creep at stress levels that are in the quasi-linear region of the stress-strain diagram. These properties are demonstrated with numerical experiments of a hypothetical alloy.
2001-06-03