The Influence of Forming Strains on the Elastic Modulus and Springback of Al Alloys
Abstract
The automotive industry is developing finite element models to predict springback and enable computer design of springback compensated dies. This application requires greater understanding of the influence of deformation on elastic behavior and reduced uncertainty measurements of elastic response. Since it is well known that plastic deformation can produce a small reduction in the elastic modulus of aluminum, experiments were conducted on two Al alloys to determine if the large plastic strains of forming can produce changes large enough to produce significant springback predictions errors. The complex modulus (damping, internal friction, etc.) of samples deformed to varying degrees in uniaxial and biaxial tension were measured by dynamic thermal-mechanical analysis. The large plastic strains of forming were found to produce significant reductions in the real component of elastic modulus. Since the elastic modulus of Al varies significantly with crystallographic orientation, texture measurements were used to evaluate the relative roles of texture changes and plastic deformation on the modulus.
- Publication:
-
APS March Meeting Abstracts
- Pub Date:
- March 2004
- Bibcode:
- 2004APS..MARP18004R