Question

The solid cireular cross-section bar shown is machined from AISI 1040 CD steel and is subjected to a t60 kip fuctuating axial load as shown. 18 in 8 in 8 in 0.20 in rad." L- 2-in dia. 3-in dia. +60 kip НН -60 kip 1. Estimate the fully corrected endurance limit. Express your answer in ksi. 2. Determine the minimum factor of safety based on achieving infinite life 3. Determine the factor of safety against yielding on the first cycle. 4. Estimate the number of cycles to failure.

show all work and steps

Answer 1

一0.265 2.10, b0-26S Ka= 2.70 C85) O.332 KA! る0.1 2 Neve be 3

2. . 853 O 20 t -l 1.7 SI T2 2. A 2 2.

Suur Se Numbet Sut ウニ 0.86 6 2. O. 866 x 85 80 Ks る .1 るo.1 33.44 o

2.6 Figure A-15-7 Round shaft with shoulder fillet in tension. σ0-F/A, where 2.2 A d4. Did= K, 1.8 .10 1.4 1.02 0.100.15 0.20 0.30 100 0.25 1.0 0.05 rld

Figure 6-18 0.9 Fatigue strength fraction, f of S at 10 cycles for 0.88 -S-0.5S at 10 cycles. 086 0.84 0.82 0.8 0.78 70 80 90 100 110 120 130 140 150 160 170 180 190 200 . kpsi