Calculate the strength of the double riveted butt joint with two unequal cover plates The rivet diameter is 7 mm, pitch is 50 mm, back pitch is 35 mm. The plate thickness is 6 mm and the thickness of top and bottom cover plates is 4 and 3 mm respectively. The failure stresses are 360 MPa, 450 MPa and 300 MPa in tension, compression and shear respectively