Materials insight

Improved Plasticity and Failure models for Extruded MgProfiles in Crash Simulations

by Helmut Gese5,639 views

"The Crash Simulation of Magnesium Structures with Finite Element Methods demands the use of suitable material and failure models. An associated plasticity model describing the complex asymmetric yield behaviour in tension and compression of Mg extrusions has been developed during the InMaK-project (Innovative Magnesium Compound Structures for Automobile Frames) supported by the German Federal Ministry for Education and Research (BMBF). Differences to the material model 124 in LS-DYNA are exposed. In order to describe the failure behaviour of Mg extrusions under multiaxial loading in FEM crash simulation this constitutive model has been combined with a fracture model for ductile and shear fracture. The fracture model has been added to the user defined constitutive magnesium model in LS-DYNA. The experimental investigations carried out on model components are compared with numerical derived results. Experimental methods for fracture parameter evaluation are shown and general aspects of metal failure due to fracture as well as different modelling techniques are discussed."

Gernot Oberhofer (Sp), Harry Dell, Dmitri Dell, Helmut Gese, Horst Lanzerath, Jürgen Wesemann, Elke Hombergsmeier

AutomotiveHigh Speed TestingLS-DYNAMechanicalMetalsRate DependencyResearch PapersYielding/Failure Analysis

Further reading

Links

About the author

Helmut Gese

Dr. Helmut Gese is the founder of MATFEM, and is an owner of MATFEM together with Dipl.-Ing. Gernot Oberhofer. Dr. Gese is responsible for the organization and coordination of technical projects. 

MATFEM offers technical and scientific services for industrial companies in the fields of material sciences and finite element methods. MATFEM coordinates material tests together with partner labs (branch ´CommonLAB´), derive new mathematical material models from the tests and implement these models into commercial finite element codes (branch `SoftMat´). Additionally MATFEM offers FEM consulting with a focus on nonlinear problems (branch ´FEM Services´). Most of the turnover is created in the field of technical services. A growing part of the turnover is created with technical software. MATFEM was founded in 1993.

http://matfem.de/en/index.html

 

Keep exploring