4. A cylindrical pipe contains a through-thickness circumferential crack as shown in the Figure below in which R = 100 mm, t = 10 mm, 20=2. It is subjected an axial force P and a bending moment M. For a P = 30 kN and M = 30 kN-m, calculate the total J. Note: This is not a pressure vessel rather a tubular structural element in combined loading. Assume plane stress condition, if necessary. 400 MPa, &* = = % E a=2.25, n = 7.0, E = 180 GPa. P M Flaw Ro 20 R Ri