花岗岩和混凝土动态拉伸性能研究

Analysis on the dynamic tension strength of granite and concrete materials under high strain-rate

为了研究岩石类材料在高加载率下的动态拉伸性能,利用纯铜波形整形器改进后的分离式Hopkin-son压杆装置(SHPB),在不同加载率下分别对花岗岩和混凝土试件进行了动态巴西圆盘实验.基于实验结果,分析了岩石类材料的动态拉伸破坏时间、劈裂破坏模式、动态拉伸应变和拉伸应力的加载率相关性规律.通过对比研究表明岩石类材料在高加载率下抗拉强度的加载率敏感性远大于其抗压强度,混凝土的动态力学性能的加载率敏感性大于花岗岩.

In order to investigate the dynamic tensile strength of rock-materials, the dynamic Brazilian disc experiments of granite and concrete under high strain-rate were produced on the modified split Hopkinson pressure bar （SHPB） with a thin copper circular plate as a pulse shaper. The results of analysis on experiments show that the failure pattern and the tension stress of rock-materials have the strong influence with the strain rate. On the other hand, the tension failure time of the rock materials can be seen as irrelative with the strain rate. Meanwhile, through comparative analysis, it can be seen that the dynamic tension mechanics performance of rock materials have the stronger sensitivity of strain rate than the dynamic compression mechanics performance of rock materials.