Question: Problem 6 . 2 6 Repeat Prob. 6 - 2 5 for a load that fluctuates from 1 2 kN to 2 8 kN .

Problem

6.26

Repeat Prob.

6 - 25

for a load that fluctuates from

12

kN to

28

.

Use the Modified Goodman, Gerber, and ASME

-

elliptic criteria and compare their predictions.

Problem

6.25

The cold

-

drawn AISI

1040

steel bar shown in the figure is subjected to a completely reversed axial load fluctuating between

28

kN in compression to

28

kN in tension. Estimate the fatigue factor of safety based on achieving infinite life and the yielding factor of safety. If infinite life is not predicted, estimate the number of cycles to failure.

Problem 6 . 2 6 Repeat Prob. 6 - 2 5 for a load

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