A finite element simulation on creep behavior in welded joint of chrome-molybdenum steel including interaction between void evolution and dislocation dynamics

Abstract

This paper deals with a new framework of a numerical method for a prediction of creep behavior in a welded joint with a chrome-molybdenum steel by including both void evolution and dislocation dynamics. For a creep consitituive equation with void evolution, the model proposed in the past is generalized by vanishing the locally coupled analysis. A dislocation model with a scalar variable of dislocation density, which the dislocation can be piled up and annihilated, is included into the creep constitutive equation. Interactions between the void and dislocation are newly considered, as the void becomes an obstacle against the dislocation motion and a dense dislocation field becomes a source and a sink of the void.