An Approach for Full-Range True Stress-Strain Curves of 304 Stainless Steel Using Funnel-Type Specimens

摘要

The description of constitutive relationship of materials up to failure is very significant for structure damage and large displacement assessment.This paper presents a new method to determine the full-range uniaxial constitutive relationship of 304 stainless steel by the tensile tests of the funnel specimens with small curvature radius.APDL command stream program of ANSYS is developed to achieve the conduction of true constitutive relationship based on digital image method.The finite element simulation (FES) results for the funnel specimens show that,the simulative load versus displacement curve,diameter at the funnel root versus displacement curve and funnel deformation contours are closed to the testing results.In addition,the stress and strain for 304 stainless steel when the specimens failed are given.