An Experimental Study of Determining the Dynamic Strength and Young's Moduli of Sandstone and Limestone by Using the SHPB Method

The dynamic strengths and Young's moduli of sandstone and limestone are determined by using the SHPB method in this paper. The average strain rate is about 1×10² to 2×10²/s. Some explainations and discussions in detail concerning the techniques of using this method are given. In order to understand the effect of strainrate static experiments（ε ×10⁵/s） are also maxle.The average dynamic Young's modulus of the sandstone is 30% higher than its static one, while for the limestone it is 20% higher than its static. The average dynamic compressivc strength of the sandstone is 40% higher than its static one, but it is 30% higher than its static for the limestone. The experimental results also show that the fracture surfaces are always nearly perpendicular to its ending surfaces.