5 (a) A steel bar is subjected to a sequence of completely reversed stress cycles which vary over a 20 second time period as follows: Five tycles at 570 N/mm, two cycles at 630 N/mm2 and one cycle at 700 N/mm?. The corresponding lives for the above stresses are 10°, 3.8 x 10* and 1.6 x 10* cycles. The endurance limit of the steel used is 430 N/mm?. Evaluate the fatigue life of the bar for the given repeating sequence of loading.

5 (a) A steel bar is subjected to a sequence of completely reversed stress cycles which vary over a 20 second time period as follows: Five tycles at 570 N/mm, two cycles at 630 N/mm2 and one cycle at 700 N/mm?. The corresponding lives for the above stresses are 10°, 3.8 x 10* and 1.6 x 10* cycles. The endurance limit of the steel used is 430 N/mm?. Evaluate the fatigue life of the bar for the given repeating sequence of loading.

Mechanics of Materials (MindTap Course List)

9th Edition

ISBN:9781337093347

Author:Barry J. Goodno, James M. Gere

Publisher:Barry J. Goodno, James M. Gere

Chapter2: Axially Loaded Members

Section: Chapter Questions

Problem 2.5.1P: The rails of a railroad track are welded together at their ends (to form continuous rails and thus...

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5 (a)
A steel bar is subjected to a sequence of completely reversed stress cycles which
vary over a 20 second time period as follows:
Five tycles at 570 N/mm, two cycles at 630 N/mm2 and one cycle at 700 N/mm?.
The corresponding lives for the above stresses are 10°, 3.8 x 10* and 1.6 x 10* cycles.
The endurance limit of the steel used is 430 N/mm?.
Evaluate the fatigue life of the bar for the given repeating sequence of loading.

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