A Geometry-Dependent Void Closure Model Considering Void Deformation and Orientation Changes during Hot Metal Formation

In this paper, a void closure model applicable to the general hot forming process has been proposed. Through representative volume element (RVE) method, influences of shape, orientation, and stress state on tendency were analysed. The was established so that it could consider these cross effects. calculates changing radius orientation during deformation by considering rate change parameters affecting with respect effective strain. predicted well RVE scale adequately in multi-stage random voids. results compared stress-triaxiality-based (STB) model, which showed proposed study is situations. A cogging analysed, degree at end each pass calculated model. For experimental verification spherical ellipsoid voids placed rectangular specimen, radii after compression measured. measurement calculation