8 – 7. A boiler is constructed of 8 – mm thick steel plates that are fastened together at their ends using a butt joint consisting of two 8 – mm cover plates and rivets having a diameter of 10 mm and spaced 50 mm apart as shown. If the steam pressure in the boiler is 1.35 MPa, determine (a) the circumferential stress in the boiler’s plate apart from the seam, (b) the circumferential stress in the outer cover plate along the rivet line a – a, and (c) the shear stress in the rivets.
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