We want to design a tension spring with a spring outer diameter of 32 mm. The range of tensile load is 110 160 N, and the deformation range is 140~ 170 mm. We are going to use SWO-B as the material. (1) At this time, estimate and determine the diameter of the spring and the wire. (Check whether the stress exceeds the strength of the material) (2) Calculate the effective number of coils and free length. 3. As shown in the picture, there is a riveted joint on which an eccentric load P = 1200 kgf is acting. The allowable shear strength of the rivet is ra = 8.3 kgf/mm^2 and e = 60 mm (1) Find the direct shear force received by the rivet due to the eccentric load. (2) Find the maximum shear force of the rivet due to the moment generated by the eccentric load. (3) Design the diameter of the rivet. 11 -tis