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含偏置裂纹材料断裂韧性的焦散线实验测试

李清 曹怀建 杨鸣泽 郭洋 薛耀东 于强

李清, 曹怀建, 杨鸣泽, 郭洋, 薛耀东, 于强. 含偏置裂纹材料断裂韧性的焦散线实验测试[J]. 矿业科学学报, 2017, 2(3): 243-250.
引用本文: 李清, 曹怀建, 杨鸣泽, 郭洋, 薛耀东, 于强. 含偏置裂纹材料断裂韧性的焦散线实验测试[J]. 矿业科学学报, 2017, 2(3): 243-250.
Li Qing, Cao Huaijian, Yang Mingze, Guo Yang, Xue Yaodong, Yu Qiang. Experimental investigation on dynamic fracture toughness of offset crack material using caustic method[J]. Journal of Mining Science and Technology, 2017, 2(3): 243-250.
Citation: Li Qing, Cao Huaijian, Yang Mingze, Guo Yang, Xue Yaodong, Yu Qiang. Experimental investigation on dynamic fracture toughness of offset crack material using caustic method[J]. Journal of Mining Science and Technology, 2017, 2(3): 243-250.

含偏置裂纹材料断裂韧性的焦散线实验测试

基金项目: 国家自然科学基金(51374212,51134025)
详细信息
    作者简介:

    李清(1969—),男,湖南岳阳人,博士,教授,主要从事爆破工程及土木工程方面的教学与研究工作.

  • 中图分类号: TB2

Experimental investigation on dynamic fracture toughness of offset crack material using caustic method

  • 摘要: 应用落锤冲击加载系统,对含偏置裂纹的半圆盘试件在冲击载荷作用下的动态断裂行为进行了实验研究.结果表明:随着预制裂纹偏置距离的增大,剪应力在裂纹尖端的作用增强,裂纹逐渐由I型向I-II复合型裂纹转变,裂纹起裂需要的时间也略有增加,裂纹在扩展过程中的曲裂程度显著增大;在动态载荷作用下,裂纹的扩展速度在起裂后迅速增大到某一值后呈现不断波动变化的特点,裂纹扩展的平均速度随偏置距离的增加逐渐减小,当裂纹扩展的归一化裂纹竖向长度λ>0.8时,由于冲击点处局部压应力场的影响,裂纹的扩展速度迅速降低;随着裂纹偏置距离的增大,材料的起裂韧性KIC减小、KIIC增大.随着裂纹的扩展,裂纹的扩展韧性有所增大.
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出版历程
  • 收稿日期:  2016-08-26
  • 刊出日期:  2017-06-30

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