径向惯性对水泥砂浆动态压缩强度的影响

Effect of Radial Inertia on Dynamic Compressive Strength of Cement Mortar

通过弹性力学分析,得到了因轴向应变加速度引起的径向应力沿试件半径的分布曲线,对相同条件下实心和空心试件产生的径向应力进行比较。利用空心SHPB试件方法分析水泥砂浆试件在动态压缩破坏过程中应力分布的变化,分析了试件压缩破坏过程中应变、应变率、应变加速度等量值之间的关系;估算了动态测试中的围压水平。通过理论计算结果与实验数据的对比,分析了径向惯性对水泥砂浆动态压缩强度的影响。此结果对大直径SHPB实验设计、数据处理方法以及混凝土类材料动态压缩强度增强因子DIF的应用具有一定参考价值。

The distributions of radial stresses induced by axial strain acceleration along the radius of solid and tubular specimens were obtained by using elasticity mechanics analysis,the radial stress distribution of the solid specimen was compared with that of the tubular one under the same conditions.Using the tubular SHPB test method,the changes of the stress distribution during dynamic compression were obtained;the relationship among the strain,strain rate and strain acceleration in the dynamic compressive damage were analyzed;the lateral confinement level during the dynamic process was estimated.The influence of the radial inertia on the dynamic compressive strength of cement mortar was analyzed by comparing the calculated with the experimented.The investigated results can provide reference for large diameter SHPB test design,data processing method and application of DIF of concrete material.