Computation of the crack opening displacements for Vickers indentation cracks
Computation of the crack opening displacements for Vickers indentation cracks
复制标题
维氏压痕裂纹的裂纹张开位移的计算
DOI：
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发表时间：
2002
期刊：
影响因子：
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通讯作者：
T. Fett
中科院分区：
文献类型：
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作者：
T. Fett
维氏压痕裂纹是一个适当的工具，以确定裂纹尖端韧性K I 0和可能的桥接关系的陶瓷与R曲线的行为从总裂纹张开位移。两个贡献的总裂纹张开位移场的解决。首先考虑了未裂纹体中的残余应力，然后计算了防止裂纹面穿透所产生的接触应力。由残余位移和接触位移叠加得到的COD解以图解插值的形式给出，以双三次样条插值的表格形式给出。此外，还给出了解析表达式。近端位移由级数展开的第一项表示。
Vickers indentation cracks are an appropriate tool to determine the crack-tip toughness K I 0 and possibly the bridging relation of ceramics with an R-curve behaviour from the total crack opening displacements. Two contributions to the total crack opening displacement field are addressed. First, the residual stresses occurring in the uncracked body are considered and then, the contact stresses generated by preventing crack-face penetration are computed. The COD solution resulting from superposition of residual and contact displacements is given in the form of diagrams for graphic interpolation and in the form of a table for interpolation by bi-cubic splines. In addition, an analytical expression is provided. The near-tip displacements are represented by the first terms of series expansions.