强角闪石化橄榄二辉岩的动态拉伸强度实验研究

Dynamic tensile strength of amphibolized olivine websterite (AOW) rock

1.
College of Science, Wuhan University of Technology, Wuhan 430070, Hubei, China;
2.
Laboratory for Shock Wave and Detonation Physics Research, Institute of Fluid Physics, China Academy of Engineering Physics, Mianyang 621900, Sichuan, China

摘要: 对强角闪石化橄榄二辉岩的动态拉伸断裂强度进行了实验研究。设计了能在样品中产生持续时间大约为1.5 s拉伸应力脉冲的平板冲击回收实验。通过对回收样品的宏观和微观观察，确定了样品出现拉伸破坏开始阶段以及破坏裂纹的扩展阶段，进而确定了该岩石样品的动态拉伸强度约为265.6~315.3 MPa。同时，基于线弹性近似，导出了在一维应变条件下样品内拉伸应力和作用时间的估算公式。
- 固体力学 /
- 岩石 /
- 动态拉伸强度 /
- 冲击波
Abstract: The dynamic response and failure behavior of AOW rock subjected to tensile loads has been studied experimentally. With the help of an one-stage light gas gun, the AOW rock samples, which were subjected to the plane plate impact by PMMA flyer with different speeds, have been recovered. The impact generated a tensile stress pulse of about 1.5 s duration in AOW rock by superposing rarefaction waves to induce spall. Based on the analyses of macro-and micro-examination for the recovered samples, the dynamic tensile strength of AOW rock was determined as 265.2-314.7 MPa.
- solid mechanics /
- rock /
- dynamic tensile strength /
- shock wave