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A double riveted double strap butt joint is made with 15mm thick plates and 20 mm diameter of rivets. The pitch of the joints

A double riveted double strap butt joint is made with 15mm thick plates and 20 mm diameter of rivets. The pitch of the joints is 90 mm. Allowable stresses are o = 115 & o = 160 MPa. Oc MPa, T = 90 MPa Calculate the efficiency of the joint. (a) 62 % (b) 76 % (c) 56 % (d) 68 %

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