J. Phys. IV France
Volume 110, September 2003
Page(s) 489 - 494

J. Phys. IV France
110 (2003) 489
DOI: 10.1051/jp4:20020741

Measurement of the mechanical properties of car body sheet steels at high strain rates and non ambient temperature

W. Bleck and P. Larour

Department of Ferrous Metallurgy, Intzestrasse 1, RWTH University of Aachen, 52072 Aachen, Germany

Crash behaviour and light weight have become the major design criteria for car bodies. Modem high strength steels offer appropriate solutions for these requirements. The prediction of the crash behaviour in simulation programs requires the information on materials behaviour during dynamic testing. The reduction of the signal waviness and the inertia effects at strain rates above 50s -1 are major issues in dynamic tensile testing. Damping techniques or load measurement on the sample itself are the common way to reduce oscillations. Strain measurement from the piston displacement or from optical devices on the specimen itself are also compared. Advantages and drawbacks of those various measurement techniques are presented.

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