An overstress elasto-viscoplasticity model for high/low cyclic strain rates loading conditions: Part I – Formulation and computational aspects

摘要: Abstract Plastic deformations of metallic materials depend on the rate loading or deformation, implying rate-independent constitutive theories cannot catch a realistic response material when condition is not quasi-static. Considering conventional rate-dependent algorithms, description irreversible does show smooth transition so-called viscoplastic strain from elastic domain to domain. In fact, sudden generation deformation takes place whenever stress state exceeds macroscopic yield during loading. Moreover, some models that adopt overstress concept are suitable for impact loadings, since they predict an unrealistic response, could bear infinite load. The present paper adopted subloading surface theory, which overcame previous drawbacks. equations were modified take into account movement similarity centre with extend rate-dependency cyclic conditions. aspects finite step accuracy algorithm and local convergence discussed.