Optimized Calculation Of High Strain Rate
Stress-strain Curves
Author(s)
P. Verleysen & J. Degrieck
Abstract
The knowledge and understanding of high strain rate material behaviour have
become increasingly important. For the dynamic characterization of materials
very often split Hopkinson bar experiments are used. However, as will be shown,
the specimen geometry and other parameters related with the actual test setup
and execution have a distinct influence on the obtained stress-strain curves. In
this contribution a technique is presented which iteratively corrects the stressstrain
curve extracted from an experiment by combination of numerical
simulations and experimental results. A major advantage of the technique
presented here is that the stress-strain curve extracted from the experiment itself
is corrected; no prior assumptions on the material behaviour have to be made.
Keywords: high strain rate, split Hopkinson bar, Kolsky apparatus, stress-strain
curve, optimization.
1 Introduction
In numerous applications materials are subjected to high strain rate loading: fast
forming processes, magnetic pulse or explosive welding techniques, vehicle
crashes, etc. In order to understand and/or model these processes, knowledge of
the strain rate dependent mechanical properties of the materials involved is
crucial. In the strain rate range of 500 to 2000/s very often Split Hopkinson Bar
(SHB) setups are used to subject materials to a high strain rate compression or
tensile load. From measurements during a SHB experiment the dynamic stressstrain
curve in the material can be calculated.
However, from experiments, it is clear that the influence of the specimen
geometry, or more general of the experimental setup, on the observed behaviour
Keywords
high strain rate, split Hopkinson bar, Kolsky apparatus, stress-strain
curve, optimization.
Related Book
Other papers in this volume
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