Numerical investigation of the dynamic compressive strength of rocks based on split Hopkinson pressure bar tests

摘要

Development of material models for engineering design and numerical simulation in a range of applications where high loading rate is encountered requires reliable material properties determined by experiments over a wide range of strain-rates, which has attracted extensive investigations. Strain-rate effects on tensile (Fig. I a) and compressive (Fig. 1 b) strengths have been examined for a number of rock-like materials, where the dynamic increase factor (DIF) is defined as the ratio of the dynamic strength to the quasi-static strength in uniaxial compression or tension, which has been widely accepted as an important parameter to measure the strain-rate effect on the strength of brittle materials. This study will focus on the compressive DIF.