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On the example of 1810 stainless steel, the results of modern experimental and
theoretical analysis of high-speed deformation and destruction of a viscoplastic material are
presented. The analysis used the results of basic experiments based on the Kolsky method
under compression and tension, as a result of which stress-strain curves were obtained at
different strain rates and temperatures. On the basis of this data, the parameters of the
Johnson-Cook model with different versions of the strain-rate multiplier are obtained. For
verification of the selected model, in the framework of the Kolsky method, two schemes were
proposed for dynamic indentation and diametrical compression of cylindrical specimens.
Comparison of the numerical simulation and experimental results allowed us to estimate the
reliability of the model. Using the plane-wave shock experiment and the VISAR
interferometer, the yield strength and spall strength of stainless steel at the strain rate of
105 s-1
were determined. This data, together with the results of experiments, using the Kolsky method
under tension, allowed us to construct the dependence of the limiting strength characteristics
of stainless steel in the range of strain rates of 103 - 105 s-1.
Keywords: Kolsky method, plane wave experiment, material model, identification, verification, spall strength, stainless steel |
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