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Fatigue failure occurs due to repeated loading and unloading of materials.
True
Fatigue failure occurs only at high loads above the tensile or yield strength for a static load.
False
Fatigue failure occurs after a short period of repeated stress or strain cycling.
False
Fatigue strength is determined when the material fails above its strength.
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The strength limits for fatigue failure under dynamic load are higher than under static load.
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For fatigue to occur, the stress in the material has to be purely compressive.
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Fatigue failure is a common phenomenon in load-bearing components/structures, bridges, and airplanes, but not in consumer products.
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Fatigue failure is ductile in nature and involves gross plastic deformation associated with failure.
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The fracture surface in fatigue failure is usually perpendicular to the direction of an applied compressive stress.
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Repeated (alternating) stress cycle is characterized by asymmetrical maximum and minimum stresses.
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In the tensile, compression, and bending tests, the intensity of the stress increases slowly but steadily until the load finally fractures the specimen. True or false?
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Components are always subjected to dynamic loads, where not only the stress intensity changes constantly but also the direction of the stress. True or false?
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Dynamic stress can only be cyclic and never random. True or false?
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Statically loaded components may provide useful values for material selection and component dimensioning. True or false?
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The applied load on the material in service application must always cause permanent deformation. True or false?
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The S-N curve is a result obtained from fatigue test? True or false?
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