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Questions and Answers
Fatigue failure occurs due to repeated loading and unloading of materials.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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?
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?
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?
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?
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?
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?
The S-N curve is a result obtained from fatigue test? True or false?
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