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为了确定岩石材料在SHPB实验中的真实应变率效应,需要去除实验中的横向惯性效应和端面摩擦效应作用引起的动态抗压强度增量。本文假定材料的真实应变率效应、横向惯性效应和端面摩擦效应三者不相关,基于数值模拟的方法确定岩石材料的横向惯性效应和端面摩擦效应。将从SHPB实验中得到的动态抗压强度数据减去分别由横向惯性效应和端面摩擦效应引起的动态压缩强度增强量,即可获得岩石类材料在SHPB实验中的真实应变率效应。
In order to determine the true strain rate effect of rock material in SHPB experiments, it is necessary to remove the dynamic inertial compressive strength increment caused by the effect of transverse inertia and end-face friction in the experiment. This paper assumes that the true strain rate effect, lateral inertia effect and end friction effect of the material are not related to each other. Based on the numerical simulation method, the lateral inertial effect and the end friction effect of the rock material are determined. The true strain rate effect of rock-like materials in SHPB experiment can be obtained by subtracting the dynamic compressive strength enhancement caused by transverse inertia effect and end-face friction effect, respectively, from the dynamic compressive strength data obtained from SHPB experiments.