32 Questions
What is the primary cause of fatigue failure in materials?
Repeated loading and unloading
Which type of stress is required for fatigue failure to occur?
Part of the stress has to be tensile
When does fatigue failure typically occur?
After a lengthy period of repeated stress or strain cycling
What type of stress cycle has symmetrical amplitude about a mean zero stress level?
Reversed (pure alternating) stress cycle
What is the nature of fatigue failure?
Catastrophic and insidious
Where is fatigue failure commonly observed?
In load-bearing components/structures, cars, and airplanes
What type of stress cycle has asymmetric maximum and minimum stresses?
Repeated (alternating) stress cycle
What type of machine components are susceptible to fatigue failure?
Crankshafts, drive shafts, gears, and springs
What is the nature of fatigue failure even in normally ductile metals?
Brittle with no gross plastic deformation during failure
In which type of consumer products can fatigue failure occur?
Shoes subjected to repetitive stresses
What type of stress is experienced by components subjected to dynamic loads?
Cyclic stress
What are the fatigue properties obtained from the fatigue test?
The S–N Curve and Strength Areas
What type of failure is particularly relevant for components subjected to dynamic loads?
Fatigue failure
What type of components are typically designed to withstand dynamic loads without permanent deformation?
Statically loaded components
What kind of test provides useful values for material selection and component dimensioning for statically loaded components?
Tensile, compression, and bending tests
What type of stress increases slowly but steadily until the load finally fractures the specimen in tensile, compression, and bending tests?
Static stress
What type of stress cycle has symmetrical amplitude about a mean zero stress level?
Reversed (pure alternating) stress cycle
What type of failure is particularly relevant for components subjected to dynamic loads?
Fatigue failure
What is the nature of fatigue failure even in normally ductile metals?
Brittle in nature
What kind of test provides useful values for material selection and component dimensioning for statically loaded components?
Tensile test
What type of components are typically designed to withstand dynamic loads without permanent deformation?
Elastic components
What are the fatigue properties obtained from the fatigue test?
Fatigue limit and endurance limit
What type of stress increases slowly but steadily until the load finally fractures the specimen in tensile, compression, and bending tests?
Static stress
What is the primary cause of fatigue failure in materials?
Repeated loading and unloading
When does fatigue failure typically occur?
At low loads lower than the tensile or yield strength for a static load
In which type of consumer products can fatigue failure occur?
Products subjected to repetitive stresses below the yield strength
Which type of stress can be cyclic or random when components are subjected to dynamic loads?
Dynamic stress
What type of failure is particularly relevant for components subjected to dynamic loads?
Fatigue failure
In which tests does the intensity of the stress increase slowly but steadily until the load finally fractures the specimen?
Bending tests
Which type of machine components are particularly susceptible to fatigue failure?
Dynamically loaded components
What type of stress cycle has asymmetric maximum and minimum stresses?
Random cycle
What is the primary cause of fatigue failure in materials?
Cyclic or dynamic loading
Test your knowledge of the contents of Chapter 4 'Fatigue Failure and Design Against Fatigue' in the Mechanical Engineering Fourth Year First Term curriculum (2023-2024). This quiz covers topics such as cyclic stresses, fatigue failure criteria, factors affecting fatigue properties, and fatigue life improvement techniques.
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