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Connect Problem $07\mathrm{.}032-$ Stress intensity factor and crack propagation $-$ DEPENDENT MULTI$-$PART PROBLEM $-$ ASSIGN ALL PARTS

Consider a thick plate of aluminum alloy $7075-$T$651.$

NOTE: This is a multi$-$part question. Once an answer is submitted, you will be unable to return to this part.

Connect Problem $07\mathrm{.}032.$a $-$ Stress intensity factor and crack propagation

Calculate the largest internal crack size $(mm)$ that the plate can support when the applied stress is three$-$quarters of its yield strength. Assume $Y=1,K_{IC}=24\mathrm{.}2$MPa, and ${}_{ys}=495$MPa.

The largest size of the internal crack is decimal places.$)$ mm$.($Round the final answer to four