Problem 1 (2+8 marko Why is preloading important for a bolted connection? How should one control the applied presad? 11. A hydro-cylinder with an inner diameter of D-160 mm is shown in Figure 1. Oil pressure is p-IN mm The cylindrical barrel and the flange are connected by eight uniformly distributed bolts. The relative stiffness of the bolted connection is kk)-03. The applied preload is Q-25F (F is the operating force) and the allowable stress of bolt material is [e] 120 Nmm Decide: a. The total tensile load carried by cach bolt; b. The resultant load on the clamped members; 4 The minor diameter required for the bolts Tolestun Jaskin 1. Figure 1 Problem 2 (5+ 6 marks) A seamless spherical shell, 900 mm in diameter and 10 mm thick is being filled with a fluid under pressure until its volume increases by 150 x 10 mm'. Calculate the pressure exerted by the fluid on the shell, taking modulus of elasticity for the material of the shell as 200 kN/mm and Poisson's ratio as 0.3. II. The steel strap with thickness of 12 mm is to be welded to a rigid frame to carry a static load of F-20 kN. The strap and frame are welded together by fillet welds along two sides, each of which has a length of /-40 mm, as shown in Figure. Select steel for strap, with yield strength of 350 MPa. The strap is to be welded with an E70 electrode. With a safety factor of S-3, decide the size of weld leg. Glossary the strength for a preloaded tension bolt subjected to a transverse load: a= 1.30p 50] 4 F T= PL The static strength for a preloaded bolt subjected to combined preload and static axial loads: (0) stress and strength at the throat section of a fillet weld F F sin 45' 0.707 strl Page 1 of 1 for