Study on dynamic characteristics of marble under impact loading and high temperature

• The high temperature split Hopkinson pressure bar experimental system is set up.
• The stress-strain curves under impact loadings and different temperatures are analyzed.
• The temperature effects on dynamic mechanical characteristics of marble are studied.
• The dynamic failure modes of marble under different temperatures are investigated.

Dynamic mechanical experiments are carried out on marble under different temperatures and different impact loadings by using the high temperature split Hopkinson pressure bar (SHPB) experimental system which is set up by integrating the 100 mm diameter SHPB with high temperature device. Combining the transformation of mineral components with the change of mineral particles under high temperatures, the dynamic mechanical characteristics are analyzed and the essence of rock fracture is explored. The experimental results show that the stress–strain curves under impact loadings and different temperatures have the same change law below 800 °C. When temperature exceeds 800 °C, the densification stage prolongs, the curve moves towards right quickly, the slope decreases and the yielding stage extends evidently. The dynamic mechanical characteristics of marble take on obvious temperature effects. The peak stress, peak strain and elastic modulus with the same impact velocity fluctuate in different extents with the increase of temperature before 400 °C. When temperature is above 400 °C, the peak stress, peak strain and elastic modulus increase or decline nearly linearly with the increase of temperature. There is remarkable difference among dynamic failure modes of marble under different temperatures. Especially, when temperature reaches 1000 °C, the fragments are powder and uniform particles.