High strain rate study of OFHC copper by experiments and simulations

Dynamic behavior of materials is generally dependent on the strain rate, so that a high strain rate test is usedto study the behavior of materials in dynamic loads. Commonly used strain rate tests include Taylor Test, HopkinsonTest, Dynamic Tensile Testing, and Ballistic Testing. The strain rate in dynamic deformations is an importantparameter in most of the material models such as Johnson-Cook which is used in many finite element software tosimulate material behaviors. J-C model has 5 constants that are mainly determined through experiments, optimizationand FE simulation. Selected material in this study are OFHC pure copper. Samples made of this materials were testedusing high strain rate condition such as Tensile Hopkinson tests, Taylor, dynamic tensile extrusion (DTE) and ballimpact. In the optimization stage the difference between the change of geometry in simulation results and dynamicexperiments is considered as objective function. Finally, material constants are determined and validated by other testdata.

کلیدواژه ها:

High strain rate ، Dynamic test ، Experiment ، Optimization ، Material constants ، Johnson-Cook model