Behavior of stainless steel at high strain rates and elevated temperatures. Experiment and mathematical modelling
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.