Dynamic tensile test and specimen design of auto-body steel sheet at the intermediate strain rate

In this paper, the tensile testing method at the intermediate strain rate is established and tensile tests of steel sheets for an auto-body have been performed to evaluate dynamic material properties. A high speed tensile testing machine has been developed for tensile tests at the intermediate strain rate. A simple jig fixture for gripping a specimen has been designed to diminish the load ringing phenomenon induced by unstable stress propagation at the high strain rate. Design of the specimen has to be performed for the dynamic tensile test considering the inertia and wave propagation effect. Finite element simulations are carried out to investigate the geometric effect of a specimen such as the parallel region, the width and the fillet radius. Optimum dimensions of a specimen are determined from the analysis and experiment. The optimum specimen together with the dynamic tensile test machine with the special jig fixture provides an accurate stressstrain curve with negligible load ringing phenomenon.
Publisher
WIT Transaction on Engineering Sciences
Issue Date
2007-06-13
Language
ENG
Description

proc. 3rd Computational Methods and Experiments in Materials Characterisation , Bologna, Italy

Citation

3rd International Conference on Computational Methods and Experiments in Material Characterisation 2007, pp.319 - 328

ISSN
1743-3533
URI
http://hdl.handle.net/10203/5940
Appears in Collection
ME-Conference Papers(학술회의논문)
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