What would be the associate crack length size if we assume that the cracks below are all same size and the failure will occur when their plastic zones touch. Assume the collinear holes are in a $2024-$T$3$ sheet, Hole diameter $=0\mathrm{.}25"$ and fastener pitch distance$=1\mathrm{.}0".$ Structure is subject to $16$ Ksi $.$

Compare the plastic zone sizes calculated from all models presented in class with net section yield criteria.