Engineering

wo grade 8.8 bolts with M20 x 2.5 rolled threads are used to attach a pillow block similar to the one shown in the figure. The bolts are initially tightened to produce a permanent connection. The stiffness of the members is estimated to be three times bolt siffess During operation the external load tending to separate the pillow block from its support varies between 0 and P. Estimate the maximum value of P that would not cause eventual fatigue failure of the bolts. Note: This problem is concerned with fatigue design only. Do not consider static design. Pillow Block attached by two bolts