Problem 1: The lap joint shown in the figure is fastened by nine 20mm diameter rivets. Each plate H chickness of 25mm and width of 250mm. Assuming that P = 50kN. a) Determine the shearing stress in each rivet b) Determine the bearing stress in each plate c) Determine the maximum average tensile stress in the most stress part of each plate.

a.) Calculate the stresses of tension bars AB and BC.  b.) Calculate the elongation of tension bars AB and BC c.) Calculate the displacement of joint B

15 kN 2) Two objects are glued on the angled plane as shown in figure. If the ultimate stress for the glued joint are 20 MPa and 10 MPa for tension and shearing stress respectively, find the value of 0 that corresponds to the maximum factor of safety and find the value of this maximum factor of safety. 0.035 m 0.05 m

A helical spring used in an automobile suspension is having a wire diameter of 7mm and an outside diameter of 72mm. The spring has 16 active coils. If the permissible shear stress of the spring material is 345 N/mm2 and the Modulus of rigidity is 83 kN/mm2.   a) Calculate the axial load in N and the deflection of the spring in mm, considering the effect of curvature. b) Calculate the value of axial load in N neglecting the effect of curvature.