Effect of impact velocity on dynamic mechnaical behaviors of marble after high temperatures

The tests on marble after different temperatures under dynamic loading at different impact velocities are carried out by using the split Hopkinson pressure bar (SHPB) apparatus 100 mm in diameter. The influences of impact velocity on the peak stress, peak strain and elastic modulus are studied. The test results show that the peak stress and peak strain after the same temperature increase linearly with the increasing impact velocity. When the temperature is above 800℃, the peak stress increases slightly and the peak strain increases obviously with the increase of impact velocity. However, the elastic modulus has no obvious impact velocity effect. The elastic modulus gradually declines with the increase of temperature. When the temperature reaches 1000℃, the elastic modulus nearly does not change with the variation of impact velocity. Considering the microstructure characteristics and the energy absorbency of marble, the effect of impact velocity on the dynamic mechanical characteristics is analyzed.