Effect of specimen thickness on the crack propagation and crack branching in delayed failure

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Abstract The crack propagation and crack branching behaviors in delayed failure have been investigated on the specimens with various thickness ( B = 1.5–10 mm ). The crack propagation velocity reveals a maximum value at a medium specimen thickness ( B = 5 mm ). This fact can be understood by assuming the compound effect of two factors that the triaxiality of stress at crack tip as a driving force for hydrogen diffusion increases with increase of specimen thickness B , and that the invasion of hydrogen atoms from specimen surface increases with decrease of B . The stress intensity factor at crack branching, K IB , increases with decrease of specimen thickness B , and when B is 1.5 mm, the specimen fractures without showing the crack branching. The latter fact can be explained by connecting the necessary and sufficient conditions for crack branching with the decrease in height of plastic region at the crack tip in thin specimens.

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