EnginSoft - Conference Abstracts

EnginSoft International Conference 2010
CAE Technologies for Industry

Advanced prediction of material failure in metal forming and crash simulation with material model MFGenYld+CrachFEM

Gese Helmut - MATFEM Partnerschaft Dr. Gese & Oberhofer (Germany)

Abstract

I wide range of new materials has been introduced by the automotive industry to fullfill the increased needs for lightweight design and passenger safety. Examples are advanced high strength steels, ultra high strength steels and light-metal structures (sheets, extrusions and castings from aluminium and magensium alloys). A predictive simulation of these materials must include a comprehensive failure prediction.
The material model MF GenYld+CrachFEM has been developed for an advanced failure prediction. This material model can be coupled to LS-DYNA and other explicit FEA codes via the user material interface. The module MF GenYld allows for a modular combination of yield loci and hardening laws to cover the elasto-viscoplastic material behaviour. The module CrachFEM can be used for a failure prediction including criteria for localized necking (in case of shell elements), ductile normal fracture and ductile shear fracture.
Failure prediction for different kind of materials will be schown in the lecture:
• failure prediction in the process chain of deep drawing and crash of steel sheets
• failure prediction for aluminium and magnesium extrusions in crash
• failure prediction for magnesium high pressure die castings in crash