Detection of cracks in ceramic matrix composites based on surface temperature

被引:3
作者
Byrd, LW
Birman, VM
机构
[1] Univ Missouri, Engn Educ Ctr, St Louis, MO 63121 USA
[2] Wright Patterson AFB, Dayton, OH USA
关键词
ceramic matrix composites; matrix cracks; nondestructive testing;
D O I
10.1016/S0263-8223(99)00075-6
中图分类号
O3 [力学];
学科分类号
08 ; 0801 ;
摘要
Ceramic matrix composites are processed at high temperatures and experience significant residual thermal stresses upon cooling to room temperature. These stresses often result in matrix cracking prior to the application of external loads. Matrix cracks may also appear as a result of thermomechanical loading. It is important to detect these matrix cracks using a nondestructive technique. The method proposed in this paper is based on measurements of the surface temperature of a ceramic matrix material subjected to cyclic stresses. The elevated surface temperature is due to friction between the fibers and the matrix that occurs in the presence of bridging matrix cracks. The solution presents a relationship between surface temperature and matrix crack spacing that can be used to identify the extent of the damage. (C) 1999 Elsevier Science Ltd. All rights reserved.
引用
收藏
页码:71 / 77
页数:7
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