PSI - Issue 13

Fuminori Yanagimoto et al. / Procedia Structural Integrity 13 (2018) 116–122 Author name / Structural Integrity Procedia 00 (2018) 000 – 000

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5. Conclusion In order to investigate the brittle crack propagation and arrest behaviors under high SIF conditions, brittle crack propagation and arrest experiments using wide width specimens were carried out under two temperatures ( −13℃ and −3℃ ) based on prediction by the numerical model. SIF transitions of the experiments were analyzed using 2D finite element analyses. As a result, the crack was arrested under −3℃ , but it penetrated the specimen under −13 ℃ although SIF reached arrest predicted by the model calculation. Based on this result, the model was modified so as that the shear lip thickness was related to effective SIF. This modified model showed good agreement with the temperature gradient crack arrest test, and it could reproduce the crack penetration under −13℃ . This result indicates that the formation of shear lip is governed by the effective SIF, which includes reduction due to the closure effects. Therefore, it is reasonable to regard whether the crack is arrested or not due to the growth of unbroken shear lip depends on the experimental temperature.

Acknowledgement

This study was partly supported by JSPS KAKENHI grant number 15H0661 and 18H03811 in financial manners. The authors express thanks to them.

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