In fatigue failure, the stresses need to be above the yield strength of the material for ultimate fracture to occur. Group of answer choices True False
Added by Enrique F.
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Fatigue failure occurs due to repeated cyclic loading, which causes the initiation and growth of cracks over time, even if the applied stress is below the yield strength of the material. Show more…
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a. If the most conservative fatigue criterion as shown in the figure below were used for infinite life design, the first cycle yield failure check is not needed. True or False b. It is easier to find the asymptotic value of fatigue strength as the endurance limit on the S-N curve for the CZ3000 alloy than that of endurance limit on the S-N curve for the 1045 steel. True or False c. "Through the notch sensitivity approach, you obtain a fatigue stress concentration factor higher than the stress concentration factor under static loading condition." True or False d. Since the contact stress and load relation is not linear in rolling, the Hertzian endurance strength should increase nonlinearly with the hardness of the contact material. True or False e. Refer to the figure below. Even though the cyclic loading accidentally caused the stresses to exceed the levels at point A slightly (as marked by the red arrow), the machine part may not break instantly according to the Modified Goodman fatigue failure criterion. True or False Yield (Langer) line Alternating stress ̃̃a Gerber line Load line, slope r = Sa/Sm Modified Goodman line ASME-elliptic line Soderberg line Sm Sy Sut Midrange stress ̃̃m
Supreeta N.
The strength coefficient is the flow stress of the material for a true strain of 1. True False
Madhur L.
Between yield stress and ultimate tensile stress which stress is present
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