Abstract：With the modified Split Hopkinson Pressure Bar (SHPB), the dynamic and quasi-static compression responses of silica sand were tested, and it exhibited obvious stress-strain effects. With diffractometry, corresponding grain size distributions of the specimens after dynamic and quasi-static loading were measured. Under the same stress level, the breakage amount in the specimen after quasi-static compression was bigger than that after dynamic compression. Building the relationship of the relative breakage to external work, the results show that the breakage efficiency of quasi-static loading was much higher, which is the intrinsic mechanism of strain rate effects for brittle granular materials.
2013, Vol. 34 
