Mixed-mode fracture angle and fracture locus of materials subjected to compressive loading
Mixed-mode fracture angle and fracture locus of materials subjected to compressive loading
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DOI：
10.1016/0013-7944(81)90017-5
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发表时间：
1981
影响因子：
5.4
通讯作者：
J. Tirosh;E. Catz
中科院分区：
文献类型：
--
作者：
J. Tirosh;E. Catz
通过分析和实验研究了预刻痕脆性材料在压缩载荷作用下的初始断裂角和断裂轨迹。问题的分析包括通过实验室测试对断裂产生显着影响的参数，即：缺口尖端曲率、缺口产生的亚临界微裂纹和裂纹闭合过程。这些考虑因素与拉伸载荷中完善的断裂标准（如本工作中使用的临界能量释放率、临界能量密度、J 积分和临界最大应力）相结合，得出了每个标准的相关断裂轨迹。由于情况（K1 和 K2）的混合模式性质，断裂角度的预评估非常有用。临界（远场）压缩载荷数据以及在 PMMA 和碳化钨样品上测量的断裂角度用于描述最合适的断裂位置，从而区分扩展至压缩载荷下断裂时的各种断裂标准。二维椭圆形裂纹完全闭合的阈值载荷的精确表达式用于界定断裂轨迹。
The incipient fracture angle and fracture loci of prenotched brittle-like material subjected to compressive loading are investigated analytically and experimentally.The analysis of the problem includes parameters whose effects on fracture were pronounced via laboratory tests, namely: notch-tip curvature, subcritical microcracks emanating from the notch and crack closure process. Such considerations, jointly with the well-established fracture criteria in tensile loading (like the critical energy release rate, the critical energy density,J-integral and critical maximum stress used in this work) yielded an associated fracture locus for each criterion. Due to the mixed mode nature of the situation (K1andK2) preevaluation of the fracture angle was instrumental.Data on critical (far-field) compressive load along with measured fracture angles performed on PMMA and Tungsten Carbide specimens are used to depict the most suitable fracture locus and thus to distinguish between the various fracture criteria when extended to fracture under compressive loading. An exact expression for the threshold load for complete closure of 2D elliptical cracks is used to delimit the fracture locus.