Podcast
Questions and Answers
In fatigue failure, the stress intensity increases slowly but steadily until the load finally fractures the specimen. True or False?
In fatigue failure, the stress intensity increases slowly but steadily until the load finally fractures the specimen. True or False?
True
Components are usually subjected to dynamic loads, where not only the stress intensity changes constantly but also the direction of the stress. True or False?
Components are usually subjected to dynamic loads, where not only the stress intensity changes constantly but also the direction of the stress. True or False?
True
In service application, components must be designed such that the applied load on the material doesn’t cause permanent deformation. True or False?
In service application, components must be designed such that the applied load on the material doesn’t cause permanent deformation. True or False?
True
The S–N Curve is a result obtained from tensile, compression, and bending tests. True or False?
The S–N Curve is a result obtained from tensile, compression, and bending tests. True or False?
Signup and view all the answers
Fatigue failure criteria are not influenced by any factors. True or False?
Fatigue failure criteria are not influenced by any factors. True or False?
Signup and view all the answers
Fatigue life improvement techniques are not discussed in the chapter. True or False?
Fatigue life improvement techniques are not discussed in the chapter. True or False?
Signup and view all the answers
Fatigue failure occurs only at loads higher than the tensile or yield strength for a static load.
Fatigue failure occurs only at loads higher than the tensile or yield strength for a static load.
Signup and view all the answers
Fatigue failure normally occurs after a short period of repeated stress or strain cycling.
Fatigue failure normally occurs after a short period of repeated stress or strain cycling.
Signup and view all the answers
Fatigue failure is more likely to occur under dynamic load than under static load.
Fatigue failure is more likely to occur under dynamic load than under static load.
Signup and view all the answers
For fatigue to occur, the stress in the material must be compressive in nature.
For fatigue to occur, the stress in the material must be compressive in nature.
Signup and view all the answers
Fatigue failure involves significant plastic deformation associated with failure.
Fatigue failure involves significant plastic deformation associated with failure.
Signup and view all the answers
Fatigue failure can occur in load-bearing components/structures and biomedical implants.
Fatigue failure can occur in load-bearing components/structures and biomedical implants.
Signup and view all the answers
Reversed (pure alternating) stress cycle involves asymmetric stress amplitudes about a mean zero stress level.
Reversed (pure alternating) stress cycle involves asymmetric stress amplitudes about a mean zero stress level.
Signup and view all the answers
Repeated (alternating) stress cycle involves symmetric stress amplitudes about a mean zero stress level.
Repeated (alternating) stress cycle involves symmetric stress amplitudes about a mean zero stress level.
Signup and view all the answers
Fatigue failure can occur in machine components such as crankshafts, gears, and springs.
Fatigue failure can occur in machine components such as crankshafts, gears, and springs.
Signup and view all the answers
Fatigue failure is more likely to occur at loads below the yield strength of the material.
Fatigue failure is more likely to occur at loads below the yield strength of the material.
Signup and view all the answers
Study Notes
Fatigue Failure
- Fatigue failure occurs due to slow and steady increase in stress intensity until the load finally fractures the specimen.
Loading Conditions
- Components are subjected to dynamic loads, which involve constant changes in stress intensity and direction.
Service Application
- Components must be designed to withstand applied loads without causing permanent deformation.
S-N Curve
- The S-N Curve is not a result of tensile, compression, and bending tests.
Factors Influencing Fatigue Failure
- Fatigue failure criteria are influenced by various factors.
Fatigue Life Improvement
- Fatigue life improvement techniques are discussed in the chapter.
Fatigue Failure Characteristics
- Fatigue failure can occur at loads below the tensile or yield strength for a static load.
- Fatigue failure typically occurs after a long period of repeated stress or strain cycling.
- Fatigue failure is more likely to occur under dynamic load than under static load.
- The stress in the material need not be compressive in nature for fatigue to occur.
- Fatigue failure does not involve significant plastic deformation associated with failure.
Types of Stress Cycles
- Reversed (pure alternating) stress cycle involves asymmetric stress amplitudes about a mean zero stress level.
- Repeated (alternating) stress cycle involves symmetric stress amplitudes about a mean zero stress level.
Applications of Fatigue Failure
- Fatigue failure can occur in load-bearing components/structures and biomedical implants.
- Machine components such as crankshafts, gears, and springs are prone to fatigue failure.
Studying That Suits You
Use AI to generate personalized quizzes and flashcards to suit your learning preferences.
Description
Test your knowledge on Chapter (4) Fatigue Failure and Design Against Fatigue, covering topics such as cyclic stresses, fatigue failure criteria, factors affecting fatigue properties, and fatigue life improvement techniques. Prepared by Dr. Reham Reda Abbas.
