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Rock Dynamic Fracture Characteristics Based on NSCB Impact Method

机译:基于NSCB冲击法的岩石动态断裂特征。

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摘要

In 2012, the International Society for Rock Mechanics (ISRM) recommended a new Notched Semicircular Bend (NSCB) method for the determination of dynamic fracture toughness of rock materials, but it did not consider the effect of some uncontrollable factors in the course of the experiment on the test result. This thesis firstly carried out dynamic fracture toughness experiments on several typical rock materials such as sandstone using the modified Split-Hopkinson Pressure Bar (SH PB) experimental system with high-speed photography, directly compared the dynamic fracture failure characteristics of several rock materials, and examined the loading rate dependency of the dynamic fracture toughness of rock materials. Based on the numerical analysis method of Discrete Lattice Spring Model (DLSM), it focused on the effect of bullet impact loading rate, loading area of incident bar, support restraints of clamping specimen, and other uncontrollable factors in the course of SHPB experiment on test results. The findings can be referenced for the improvement of NSCB method.
机译:2012年,国际岩石力学学会(ISRM)推荐了一种新的缺口半圆弯曲(NSCB)方法来确定岩石材料的动态断裂韧性,但并未考虑实验过程中某些不可控因素的影响在测试结果上。本文首先利用改进的Split-Hopkinson压力棒(SH PB)实验系统和高速照相技术对几种典型的岩石材料如砂岩进行了动态断裂韧性试验,直接比较了几种岩石材料的动态断裂破坏特性,并且研究了岩石材料动态断裂韧度的加载速率依赖性。基于离散晶格弹簧模型(DLSM)的数值分析方法,重点研究了SHPB试验过程中子弹冲击加载速率,入射棒加载面积,夹持试样的支撑约束以及其他不可控因素的影响。结果。研究结果可为NSCB方法的改进提供参考。

著录项

  • 来源
    《Shock and vibration》 |2018年第5期|3105384.1-3105384.13|共13页
  • 作者

    Wang Yanbing;

  • 作者单位

    State Key Lab Geomech & Deep Underground Engn, Beijing 100083, Peoples R China;

    Univ South Carolina, Dept Mech Engn, Columbia, SC 29208 USA;

    China Univ Min & Technol Beijing, Sch Mech & Architecture Engn, Beijing 100083, Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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