Based on the dynamics stress-strain curves of Cu-matrix
powder metallurgy(Cu-PM) at high strain rate, a numerical constitutive
equation is proposed. The dynamic compression tests are made at strain rate 10 2/s～10 3/s by Split Hopkinson Pressure Bar(SHPB), with bullet speed of 4*!m/s～15*!m/s. During the dynamic compression test, the measurement technology of semiconductor gage is suggested on the transmitted bar. The quasi-static test are made at strain rate 10 -4/s～10 -3/s by MTS machine. Unload and reload are conducted at strain 0.005, 0.01, 0.02, 0.035; show the material properties of visco-elastic plastics. By analysis the state and dynamics curves, the harden effect is shown under 300/s and quasi-static load, but the negative strain-rate effect is observed at high strain rate (more than 500/s). The damage weakening mechanism resulted from a rate-dependent evolution of cracks are discussed, it is impossible to take place the adiabatic shearing at high strain-rate for Cu-PM,proving that Cu-PM is a visco-elastic-plastic material with damage. A visco-elastic-plastic model for fitting the load curve at high strain rate is proposed. It fills up the blank of the dynamic data for PM material and supplies the credibility experiment data for the engineering application.