Constitutive equations for multiphase TRIP steels at high rates of strain

Issue		J. Phys. IV France Volume 134, August 2006 EURODYMAT 2006 - 8th International Conference on Mechanical and Physical Behaviour of Materials under Dynamic Loading


Page(s)		69 - 74
DOI		10.1051/jp4:2006134012
Published online		26 July 2006

EURODYMAT 2006 - 8th International Conference on Mehanical and Physical Behaviour of Materials under Dynamic Loading
J. Cirne, R. Dormeval, et al.
J. Phys. IV France 134 (2006) 69-74
DOI: 10.1051/jp4:2006134012

Constitutive equations for multiphase TRIP steels at high rates of strain

J. Van Slycken¹, P. Verleysen¹, J. Degrieck¹ and J. Bouquerel²

¹ Mechanics of Materials and Structures, Dept. of Mechanical Construction and Production, Ghent University, 9000 Ghent, Belgium
² Laboratory of Iron and Steelmaking, Dept. of Metallurgy and Materials Science, Ghent University, 9000 Ghent, Belgium

Published online: 26 July 2006

Abstract
Multiphase TRansformation Induced Plasticity (TRIP) steels show an excellent combination of high strength and high strain values, making them ideally suited for use in vehicle body structures. A complex synergy of three different phases (ferrite, bainite and austenite) on the one hand, and the meta-stable character of the austenite on the other hand, give the material indeed a high energy absorption potential. The knowledge and understanding of the dynamic behaviour of these sheet steels is essential to investigate the impact-dynamic characteristics of the structures. Therefore split Hopkinson tensile tests are performed in a strain rate range of 500 to 2000 s^-1. Three TRIP steel grades with a different Al and Si content were studied. The experimental results show that these steels preserve their excellent shock-absorbing properties in dynamic conditions. The typical high strain rate loading conditions and the complex behaviour of TRIP steels offer a unique investigation opportunity. This behaviour can be described with phenomenological material models that can be used for numerical simulations of car crashes. The Johnson-Cook model, a frequently used model in finite element codes, is well-suited to describe the dynamic behaviour of the investigated TRIP steels. This model is compared to the Rusinek-Klepaczko model.

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