Verification of flow curve determination from plane strain compression tests

Abstract

The work-hardening curve of sheet metals under large plastic strains can be extracted from the Plane Strain Compression Test (PSCT) using an analytical method that relies on several simplifying assumptions and correction factors (friction, boundary conditions, lateral spreading, tool geometry, yield criterion, anisotropy). This study rigorously assesses each of these correction factors using finite element simulations. Synthetic materials with predefined hardening laws are used to enable direct comparison between the reference curves and those extracted from simulated PSCTs. Dedicated simulation setups were developed to isolate the effect of each factor through progressive 2D and 3D configurations. The results show that the analytical method is generally valid when appropriate corrections are applied, with improved accuracy observed when using rounded tools with small radii under low-friction conditions. Recommendations for the selection of correction factors are provided to enhance the reliability of flow curves obtained through this method.