P12.20 (WP The cylinder in Figure P12.20 consists of spirally wrapped steel plates that are welded at the seams. The cylinder has an outside diameter of 280 mm and a wall thickness of 7 mm. The cylinder is subjected to axial loads P = 90 kN. For a seam angle ß = 35°, determine P (a) the normal stress perpendicular to the weld seams. (b) the shear stress parallel to the weld seams. FIGURE P12.20

A tensile load of 330,000 N is applied to a copper pipe with maximum allowable stress of 110 MPa and 80 mm inner diameter. What should be the thickness of the pipe?   Choices: A. 9.78 mm B. 12.35 mm C. 11.56 mm D. 10.55 mm

11.16 Two 20-mm steel plates are butt-welded together. Both the plate and the welding electrode materials correspond to strength properties of Su = 500 MPa and S, = 400 MPa. The imposed loading fluctuates rapidly between -20 and +60 kN. Estimate the length of weld required in order to provide a safety factor of 2.5: (a) If the weld reinforcement is not removed. (b) If the excess weld material is carefully ground off to provide smooth, continu- ous surfaces.

Please solve step by step , Don't use any Ai