Crack opening displacements of Vickers indentation cracks
Crack opening displacements of Vickers indentation cracks
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DOI：
10.1016/j.engfracmech.2004.07.003
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发表时间：
2005-03
影响因子：
5.4
通讯作者：
T. Fett;A. B. K. Njiwa;J. Rödel
中科院分区：
文献类型：
--
作者：
T. Fett;A. B. K. Njiwa;J. Rödel
维氏压痕裂纹是一个适当的工具，以确定裂纹尖端韧性KI 0，并可能，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。给出了残余位移和接触位移叠加的COD解，并给出了解析表达式。近端位移由级数展开的第一项表示。作为应用实例，给出了窗玻璃维氏压痕后1h的实际应力强度因子的计算。
Vickers indentation cracks are an appropriate tool to determine the crack-tip toughness KI0and, 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 the superposition of residual and contact displacements is given and an analytical expression is provided. Near-tip displacements are represented by the first terms of series expansions. As an example of application, an evaluation of the actual stress intensity factor is presented for a window glass 1h after Vickers indentation.