【摘要】 以砂岩为研究对象,采用ANSYS/LS-DYNA软件建立分离式霍布金森压杆数值模型,模拟砂岩在不同应变率及应力波加载次数下的冲击过程。研究结果表明:随着应力波的传递,砂岩表现为三种破坏模式:张应变破坏、沿径向劈裂拉伸破坏、压碎破坏阶段;随着应变率的增大,动态峰值应力和峰值应变也随之增大;应变率一定时,随着应力波加载次数的增加,岩样的入射能、反射能、耗散能都呈现减小的趋势,而总耗能却表现为逐渐增大。更多还原

【Abstract】 The sandstone was taken as the research object,and ANSYS/LS-DYNA software was used to establish a discrete Hopkinson compression bar numerical model to simulate the impact process of sandstone under different strain rates and stress wave loading times. The results show that with the transfer of stress wave,sandstone shows three failure modes:tensile strain failure,radial splitting tensile failure and crushing failure. With the increase of strain rate,the dynamic peak stress and peak strain also increase. When the strain rate is constant,with the increase of stress wave loading times,the incident energy,reflected energy and dissipated energy of rock samples all show a decreasing trend,while the total dissipated energy gradually increases.更多还原