Some basic fracture mechanics concepts in functionally graded materials
Some basic fracture mechanics concepts in functionally graded materials
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DOI：
10.1016/0022-5096(96)00041-5
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发表时间：
1996-08-01
影响因子：
5.3
通讯作者：
Batra, RC
中科院分区：
文献类型：
--
作者：
Jin, ZH;Batra, RC
本文总结了一般非均匀材料中裂纹尖端场的理论。基于裂纹桥联的概念和混合规则，研究了功能梯度材料的断裂韧性和R曲线。结果表明，当裂纹从富陶瓷区扩展到富金属区时，铝镍功能梯度材料的断裂韧性显著提高。将增韧机制的概念应用于功能梯度材料强度行为的研究，发现陶瓷侧边裂纹的Al 2 O3-Ni功能梯度材料的剩余强度对缺口相当不敏感。版权所有（C）1996 Elsevier Science Ltd
In this paper, the crack-tip fields in a general nonhomogeneous material are summarized. The fracture toughness and R-curve of functionally graded materials (FGMs) are studied based on the crack-bridging concept and a rule of mixtures. It is shown that the fracture toughness is significantly increased when a crack grows from the ceramic-rich region into the metal-rich region in an alumina-nickel FGM. By applying the concept of the toughening mechanism to the study of the strength behavior of FGMs, it is found that the residual strength of the alumina-nickel FGM with an edge crack on the ceramic side is quite notch insensitive. Copyright (C) 1996 Elsevier Science Ltd