Nonlocal numerical modelling of the deformation and failure behavior of hydrostatic-stress-dependent ductile metals

摘要

The paper deals with the numerical modelling of the large strain elastic-plastic deformation and failure behavior of metals which are sensitive to hydrostatic stresses. The model is based on an efficient logarithmic strain theory taking into account a generalized macroscopic yield criterion as well as a non-associated flow rule. In addition, the influence of nonlocal plastic variables is discussed. Numerical analyses show the influence of the geometry and boundary conditions of metal specimens as well as of various model parameters on the deformation behavior and failure modes of hydrostatic-stress-dependent metals.