CT試験片と押し込み誘起微小き製を含む曲げ試験片で評価したソーダ石灰ガラスのき裂成長特性 : 残留応力の影響

概要

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For comparing crack growth characteristics, subcritical crack growth data for soda-lime glass subjected to sustained load in water were obtained using conventional CT specimens with long crack and bend specimens with small Knoop indented crack. The relation between crack velocity V and stress intensity factor K_I obtained from as-indented specimens containing indentation crack shows that there is residual stress effect which increases crack growth in the region of lower K_I values. In addition, the slopes of the V - K_l curves for the as-indented specimens are much less than those for the CT specimens. However, the V - K_I curve for the indented and subsequently annealed specimen shows almost the same trend as that for the CT specimens. Thus, the effective stress intensity factor K_<Ieff> including the residual stress effect can be used to explain the anomalous growth of the indentation crack in its as-indented state.
社団法人日本セラミックス協会の論文
1989-09-01