Question: Repeat Prob. 817 with no washer under the head of the bolt, and two washers stacked under the nut. Repeat Prob. 817, Two identical aluminum

Repeat Prob. 8–17 with no washer under the head of the bolt, and two washers stacked under the nut.
Repeat Prob. 8–17, Two identical aluminum plates are each 2 in thick, and are compressed with one bolt and nut. Washers are used under the head of the bolt and under the nut.
Washer properties: steel; ID = 0.531 in; OD = 1.062 in; thickness = 0.095 in
Nut properties: steel; height = 7/16 in
Bolt properties: 1/2 in-13 UNC grade 8
Plate properties: aluminum; E = 10.3 Mpsi; Su = 47 kpsi; Sy = 25 kpsi
(a) Determine a suitable length for the bolt, rounded up to the nearest ¼ in.
(b) Determine the bolt stiffness.
(c) Determine the stiffness of the members.

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