(3 marks) Figure below shows a bolted joint subjected to an external force P that fluctuates from 0 to 7 kips. The steel bolt Specification is 5/8...

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[3]. (3 marks) Figure below shows a bolted joint subjected to an external force P that fluctuates from 0 to 7 kips.The steel bolt Specification is 5/8 "-I I UNC, SAE grade 5 material with rolled threads. The clamped members are steel of length I .25 in each (with a total length of 2.5 in). Plain wide washersare utilized at both ends of the bolt. [a]. Using the Goodman line, determine the factor of safety guarding against fatigue failure for thetwo cases, (i) no pre-load is applied to the joint, (ii) a recommended pre-load is applied to the jointassuming a non-permanent connection. For the calculation of member stiffness km, neglect thefrusta associated with the washers at the two ends of the bolt. For this calculation, assume that @stress concentration factor exists in the problem. [b]. Check thejoint for maximum stress in the bolt not exceeding the bolt proof stress under staticloading. Again, for this calculation, assume that no stress concentration factor exists in theproblem. p QIIQe2? P [0]. Repeat [a] by considering stress concentration factor in fatigue in the bolt threads. Repeat [b]with theoretical stress concentration factor in the bolt threads to be the same as in fatigue (i.e., notch sensitivity, q = l). sled M, 95111 um. 1': 2.5.8