セラミックスの保証試験後の打切り強度 : 除荷中に安定き裂成長の生ずる場合

概要

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This paper is concerned with a theoretical aspect of proof testing of ceramics. In the case when slow crack growth occurs during the unloading process of proof testing of ceramics, the truncation strength S_<f min> (minimum Strength after proof testing) becomes lower than the proof stress σ_p. The equations for S_<f min> in such a case were derived by Evans and Ritter. However, existence of the three distinct regions I, II and III in da/dt-K diagram was not fully taken into account in their equations. Thus, in this paper, a detailed analysis was carried out taking account of the actual crack growth characteristics, and the equation for S_<f min> was derived. A convenient diagram for determining the proof testing condition was also proposed.
一般社団法人日本機械学会の論文
1987-12-25