Assessment of full field crystal plasticity finite element method for forming limit diagram prediction

TL;DR

This paper evaluates the use of full field crystal plasticity finite element modeling to predict forming limit diagrams in sheet metal forming, aiming to improve virtual material testing accuracy without extra assumptions.

Contribution

It demonstrates the feasibility of applying crystal plasticity models directly for forming limit prediction, bypassing traditional empirical or simplified models.

Findings

Successful application of crystal plasticity for forming limit prediction

Avoidance of additional assumptions in forming limit calculations

Potential for more accurate virtual material testing

Abstract

This study is inspired by the recent development of "virtual material testing laboratory" in which the main equipment is a full field crystal plasticity modeling tool. Ample examples have demonstrated its applications to sheet forming operations. In those applications, the mechanical anisotropy originated from the crystallographic texture can be adequately described, such as r-values and earing. Formability is another important property in sheet metal forming, which has yet not been equipped in these virtual laboratories. Though theoretical models for formability can be dated back to 1885 due to Consid\`{e}re, all popular models at the moment suffer from their respective limitations. In this study, we explore the feasibility of applying full field crystal plasticity model for calculating forming limit diagram, avoiding using additional assumptions or models for determining the forming limits.