Answer to Question #130067 in Mechanical Engineering for Nishant Mishra

Question #130067
The figure is a drawing of a 4- by 20-mm latching spring. A preload is obtained
during assembly by shimming under the bolts to obtain an estimated initial
deflection of 2 mm. The latching operation itself requires an additional
deflection of exactly 4 mm. The material is ground high-carbon steel, bent then
hardened and tempered to a minimum hardness of 490 Bhn. The inner radius of
the bend is 10 mm. Estimate the yield strength to be 90 percent of the ultimate
(a) Find the maximum and minimum latching forces.
(b) Determine the fatigue factor of safety for infinite life, using the modified
Goodman criterion.
(c) **Two Bolts of the following properties are used to fix the spring to the frame.
Determine the load carried by each bolt and the stresses in each bolt.

I wish a neat solution for PART C two bolts...

Bolt grade Bolt spec. ISO 9.8 M12 X 1.75 F 140 А A 10 R - 20- 4 Section A-A
Expert's answer
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