Q3 [20] Two steel plates of identical thickness of 20 mm are fastened together to form a non-permanent tension joint. The bolt (nominal diameter 14 mm, coarse series, metric Grade 9.8) is chosen. A preload of 0.7F is applied to ensure adequate initial loading against separation. Determine (i) the member stiffness and the bolt stiffness, and bolt stiffness constant C; (ii) the allowed value of P in accordance with the Goodman criterion if the tensile load in the tension bolt joint varies periodically from F = 0 to Fx = P. In your calculation, use a factor of safety 1.5; find the stress concentration factor for cut threads in Table 8-16; apply the factor of safety and the stress concentration to the component stress only in design for fatigue strength. F/2 F/2 F/2 F/2 Standard regular hexagonal nut