Let the bolt in Fig. 12-13 be 20 mm in diameter, and let length l be equal to 400 mm. The threads at the bottom have a pitch of 2.5 mm, slopping immediately above the nut. Ignore the effect of the weight of the bolt. The bolt is made of steel.
(a) If a mass of 30 kg drops 2.5 mm to the nut, find the stress in the gross and net sections of the boll. Take root diameter as gross diameter minus 1.3p.
(b) Find the stress if the entire body of the bolt above the nut is reduced to the stress area of the threads.
(c) Find the stress if one-half the length of the bolt is reduced to the stress area.
(d) If the bolt is made of phosphor bronze, find the stress in the net section of the thread.
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