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What kind of stress does this graph show?

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What kind of stress does this graph show?

(a) Reversed stress

(b) Fluctuating stress

(c) Irregular stress

(d) Constant stress

I have been asked this question in semester exam.

Question is from Impact Tests on Metals, Fatigue Tests in division Wear of Metals, Mechanical Properties and Testing of Engineering Material & Metallurgy

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Correct option is (b) Fluctuating stress

Explanation: There are basically three kinds of stress cycles of fatigue loading. The graph in the question illustrates that of a fluctuating stress. Reversed stress is similar to fluctuating stress but it travels in both quadrants of the graph. Irregular stress is the third kind of stress cycle observed.

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