SUBCRITICAL CRACK-GROWTH OF MACROCRACKS IN ALUMINA WITH R-CURVE BEHAVIOR

被引：51
|
作者：
FETT, T
MUNZ, D
机构：
[1] Kernforschungszentrum Karlsruhe, Institut für Materialforschung II, Karlsruhe
来源：
JOURNAL OF THE AMERICAN CERAMIC SOCIETY | 1992年 / 75卷 / 04期
关键词：
D O I：
10.1111/j.1151-2916.1992.tb04166.x
中图分类号：
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Subcritical crack growth of macroscopic cracks in two Al2O3 ceramics is investigated with single-edge-notched bending specimens under constant load. The resulting v-K(I)-curves are in complete contrast to the behavior of natural cracks. In spite of the monotonic increase of the externally applied stress intensity factor due to crack extension, the crack growth rates first decrease. This behavior is caused by crack shielding due to crack border interaction and can be described by a rising crack growth resistance. Two methods are applied to determine the R-curve under subcritical crack growth conditions.
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页码：958 / 963
页数：6
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