モードIとモードIIの混合モード負荷条件における2024-T3Al合金薄板き裂材の安定き裂発生条件

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In this study, the mode I-II mixed-mode tests were carried out on thin-sheet center-cracked specimens of 2024-T3 Al-alloy using the mixed-mode testing method shown in Fig. 1(b), which was been proposed by the present authors in a previous paper. The condition for initiation of stable crack growth was investigated in terms of the J-integral. The results were compared with those obtained in the previous paper using slant center-cracked specimens of 2024-T3 Al-alloy, as shown in Fig. 1(a). The following conclusions were obtained. (1) When the proposed testing was applied, the stable crack initiation load was considerably lower than the plastic collapse load in every mode I-II mixed-mode region, whereas in the mixed-mode tests using slant center-cracked specimens, the stable crack initiation load was almost eqaul to the plastic collapse load in the region near the pure mode II condition. (2) When the proposed testing method was used, stable crack initiation was found to follow the relation J_I+ηJ_<II>=(J_i)_I in every mode I-II mixed-mode region, where J_I and J_<II> are the mode I and mode II components of the J-integral, (J_i)_I is the J-value at stable crack initiation under the pure mode I condition, and η is a constant. On the other hand, in the mixed-mode test using slant center-cracked specimens, the experimental results deviated from the relation J_I+ηJ_<II>=(J_i)_I in the region near the pure mode II condition.
一般社団法人日本機械学会の論文
1991-08-25

モードIとモードIIの混合モード負荷条件における2024-T3Al合金薄板き裂材の安定き裂発生条件

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