and can you please write the name of the formulas used if you can, thanks :)

calculation with uploading your answer sheet of solution steps and answers (copy) A thin wall pipe with a flaw of depth a is under tensile hoop stress of =320MPa due to internal gas pressure P. The crack length 2c is 3 times of the depth a (a/2c=0,33). the fracture toughness of the material is 40MPam1/2 and the yield strength of the material is 533MPa stress intensity factor K2=1.2102ma/Q 1. what is the critical crack depth a in mm? 2. The pipe wall t is 10mm thick. is this a leak-before-break or break-before-leak situation? Is this situation good or bad for abrupt fracture prevention? igure 11-5 Flaw geometry and design of cylindrical pressure vessel. igure 11-6 Flaw-shape paramler Q for surface and internal liptical cracks