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Stress intensity factor

hi all,

I am facing problem in understanding stress intensity factor. How exactly i can analyse crack propagation through SIF. In books it is given that SIF characterises the crack. But in numbers how can i know whether this crack will propagate for this value of SIF. According to westergaard equation crack tip stresses will go to infinity if θ and r tends to zero for any value of crack length. Please somebody help regarding this. If iam technically wrong please correct me.

Thank you



AS's picture


There are several papers on this topic indeed, starting from the early days of fracture mechanics. This is one of mine, maybe you may find it useful: "Crack kinking in brittle materials", Journal of the Mechanics and Physics of Solids 58 (2010) 1835–1846.

Hope it helps.

Best regards


Zhigang Suo's picture

Perhaps you'd like to read the classic paper by Paul Paris on how the stress intensity factor governs the growth of a crack.

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