Some basic fracture mechanics concepts in functionally graded materials

被引：311
|
作者：
Jin, ZH
Batra, RC
机构：
[1] Dept. of Eng. Science and Mechanics, Virginia Polytech. Inst. Stt. Univ., Blacksburg
来源：
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS | 1996年 / 44卷 / 08期
关键词：
residual strength; strengthening mechanisms; crack mechanics; inhomogeneous material;
D O I：
10.1016/0022-5096(96)00041-5
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
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
引用
收藏
页码：1221 / 1235
页数：15
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