Tension/compression Test Of Auto-body
Steel Sheets With The Variation Of The Pre-strain
And The Strain Rate
Author(s)
G. H. Bae & H. Huh
Abstract
This paper investigates the tension/compression hardening behaviour of autobody
steel sheets with the variation of the pre-strain and the strain rate. To
conduct tension/compression tests with the variation of the pre-strain and the
strain rate, an experimental method was established by using a newly developed
clamping device to suppress buckling of a specimen. The clamping device
provides the supporting force from compression-type coil springs during the test
with a conventional dynamic material fatigue testing machine. From
experiments, the tension/compression hardening behaviour was observed with
the variation of the pre-strain and the strain rate. Effects of the pre-strain and the
strain rate on the hardening behaviour were also investigated based on the
tension/compression test results.
Keywords: tension/compression test, clamping device, pre-strain, strain rate.
1 Introduction
Spring-back caused by the elastic recovery of the residual stress inside a formed
part has been one of the most significant sources of defects in the sheet metal
forming process in recent years. Spring-back predictability of numerical
simulation, however, has not been satisfactory because its performance is not
good enough to calculate accurate residual stress during the forming process. To
improve spring-back predictability in numerical simulation, many researchers
have been trying to use accurate information of the hardening behaviour of sheet
materials in finite element analysis. The hardening behaviour of sheet materials
Keywords
tension/compression test, clamping device, pre-strain, strain rate
Related Book
Other papers in this volume
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