(a) Draw the Goodman and Gerber lines for a steel whose ultimate stress is 1,250 MPa and whose fatigue limit (assuming completely reversed loading) is 400 MPa.

(b) If this steel is loaded sinusoidally with an alternation stress, ??=150 MPa, what is the maximum stress that can be applied to the specimen without its failing if the Goodman line is taken as valid?




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