Question

In a connection using 5/8-inch Φ (UNF-18, SAE Grade 8) bolts, each bolt is subjected to a varying axial load between 10 Kips to 20 Kips. Bolts can be preloaded between 0% (none) and 100%, at 10% intervals, of their proof strength.

What range of preload is ideal so that the fatigue life of this joint is infinite without join separation?

Use Modified Goodman Criteria for fatigue and show calculations for the preload levels between 0% and 100% (or at least the two cases of 0% and 50%). Calculate max stress and factor of safety for infinite life vs. preload as % of proof strength; find gross yielding & joint separation of bolts; then establish a workable range and ideal value for preload.

Answer 1