The bracket in figure P15-2 (p. 924) is fastened to the wall by 4 cap screws equ
ID: 1858492 • Letter: T
Question
The bracket in figure P15-2 (p. 924) is fastened to the wall by 4 cap screws equispaced on a 10 cm diameter bolt circle and arranged as shown. The wall is the same material as the bracket. The bracket is subjected to a sinusoidal force-time function with Fmax=F and Fmin=-F where F and the beam's other data are given in the row assigned from Table p15-1. Find the forces acting on each of the 4 cap screws due to this fully reversed loading and choose a suitable cap screw diameter, length, and preload that will give a minimum safety factor of 1.5 for any possible mode of failure for N=5x10^8 cycles.
Row a Data: Bolt Thread is M8x1, Member Material is steel, length, l=30 mm.
The correct answer is Four M4x0.7x20mm long cap screws, class 4.8, Fpreload=2.04kN (75% of proof), load on top bolts when force is maximum and load on bottom when force is minimum: 2.05kN, load on top bolts when force is minimum and load on bottom when force is maximum: 2.05kN, Ny=1.5, Nsep=69, Nf=10.
Explanation / Answer
lengthy question. repost it plz
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