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压应力对压剪裂纹扩展的影响研究

王勃 张阳博 左宏 王厚锦

王勃, 张阳博, 左宏, 王厚锦. 压应力对压剪裂纹扩展的影响研究[J]. 力学学报, 2019, 51(3): 845-851. doi: 10.6052/0459-1879-18-369
引用本文: 王勃, 张阳博, 左宏, 王厚锦. 压应力对压剪裂纹扩展的影响研究[J]. 力学学报, 2019, 51(3): 845-851. doi: 10.6052/0459-1879-18-369
Bo Wang, Yangbo Zhang, Hong Zuo, Houjin Wang. STUDY ON THE INFLUENCE OF COMPRESSIVE STRESS ON THE COMPRESSION SHEAR CRACK PROPAGATION[J]. Chinese Journal of Theoretical and Applied Mechanics, 2019, 51(3): 845-851. doi: 10.6052/0459-1879-18-369
Citation: Bo Wang, Yangbo Zhang, Hong Zuo, Houjin Wang. STUDY ON THE INFLUENCE OF COMPRESSIVE STRESS ON THE COMPRESSION SHEAR CRACK PROPAGATION[J]. Chinese Journal of Theoretical and Applied Mechanics, 2019, 51(3): 845-851. doi: 10.6052/0459-1879-18-369

压应力对压剪裂纹扩展的影响研究

doi: 10.6052/0459-1879-18-369
基金项目: 1) 国家自然科学基金资助项目(11572235).
详细信息
    通讯作者:

    左宏

  • 中图分类号: O344.3;

STUDY ON THE INFLUENCE OF COMPRESSIVE STRESS ON THE COMPRESSION SHEAR CRACK PROPAGATION

  • 摘要: 本文针对压剪裂纹的启裂及扩展问题,研究了脆性材料中裂纹面压应力变化对其扩展的影响规律.借助双轴加载试验机可自由调节两个轴位移和力的优势,设计了一种单边对称双裂纹压剪试样.试验中,施加裂纹面压应力至不同的预设值后,使剪应力单调增大直至裂纹启裂及扩展,得到不同预设压应力下压剪裂纹启裂及扩展规律. 随着预设压应力增大,启裂角增大,裂纹扩展路径与初始裂纹的偏角也增大.但随着压应力增大,启裂角增大至一定值后趋于稳定,实验发现,依据裂纹是否闭合,压应力对压剪裂纹扩展的作用大致可分为两个阶段:闭合前,压应力对裂纹启裂载荷及启裂角、扩展路径均有影响,预设压应力增大,裂纹启裂载荷增大、启裂角增大,扩展路径愈来愈偏离初始裂纹方向;闭合后,压应力虽然增大,启裂角和临界压剪应力比始终恒定,压应力对临界剪力和扩展路径存在一定影响.研究表明,裂纹启裂角与启裂时的压剪应力比存在一定的对应关系.启裂时的压剪应力比增大,启裂角增大,启裂时的压剪应力比恒定,启裂角不变.

     

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出版历程
  • 收稿日期:  2018-11-06
  • 刊出日期:  2019-05-18

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