Anisotropic behaviour law for sheets used in stamping: A comparative study of steel and aluminium

TL;DR

This paper compares the anisotropic behaviour laws of steel and aluminium sheets used in stamping, focusing on aluminium's improved simulation accuracy through the Hill 48 quadratic yield criterion with hardening.

Contribution

It validates the Hill 48 quadratic yield criterion with hardening for aluminium sheets, enhancing stamping simulation reliability.

Findings

Aluminium's stamping simulation accuracy improves with the Hill 48 model.

The study confirms the effectiveness of the yield surface and experimental tests.

Comparison highlights differences between steel and aluminium behaviour laws.

Abstract

For a car manufacturer, reducing the weight of vehicles is an obvious aim. Replacing steel by aluminium moves towards that goal. Unfortunately, aluminium's stamping numerical simulation results are not yet as reliable as those of steel. Punch-strength and spring-back phenomena are not correctly described. This study on aluminium validates the behaviour law Hill 48 quadratic yield criterion with both isotropic and kinematic hardening. It is based on the yield surface and on associated experimental tests (uniaxial test, plane tensile test, plane compression and tensile shearing).