The paper presents the results of experimental testing by magnetic-pulse method of Cu-ETP samples with crack type macro defect. Three-dimensional modeling of the magnetic field in the loading device -sample system was performed, on the basis of which the magnetic pressure was calculated and mechanical simulation was performed with Johnson-Cook plasticity model and fracture criteria. Comparison of the obtained results of residual deformation indicates the applicability of Johnson Cook plasticity model for OFHC copper for describing the behavior of Copper ETP in the deformation rate range up to 104 1/s.