Assume the internal pressure varies cyclically in the cylinder from pmin=0 to Pmax , where Pmax is 60% of the estimated maximum pressure that will lead to failure by yielding as predicted by Tresca criterion. The Paris law for the material is da = 1.6 X 10 "(AK) 9 m/cycle CA a. Find the number of cycles for the crack of initial length 200 = 0.01 m to grow to a length 20 = 0.025 m. b. Find the number of cycles before the crack reaches critical length (i. e life of the part).