Dynamic Tensile Test And Specimen Design Of
Auto-body Steel Sheet At The Intermediate
Strain Rate
Author(s)
S. B. Kim, J. H. Song, H. Huh & J. H. Lim
Abstract
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.
Keywords: intermediate strain rate, dynamic material properties, dynamic
tensile test, load ringing phenomenon, tensile specimen.
1 Introduction
The dynamic tensile properties of auto-body steel sheets in an auto-body are
important since the range of the strain rate is several tens to hundreds per second
under 500/s in a real auto-body crash and at which the dynamic response of steel
Keywords
intermediate strain rate, dynamic material properties, dynamic
tensile test, load ringing phenomenon, tensile specimen.
Related Book
Other papers in this volume
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