Mechanical Engineering Dept - Fatigue Failure and Design Quiz

In fatigue failure, the stress intensity increases slowly but steadily until the load finally fractures the specimen. 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?

In service application, components must be designed such that the applied load on the material doesn’t cause permanent deformation. True or False?

The S–N Curve is a result obtained from tensile, compression, and bending tests. True or False?

Fatigue failure criteria are not influenced by any factors. True or False?

Fatigue life improvement techniques are not discussed in the chapter. True or False?

Fatigue failure occurs only at loads higher than the tensile or yield strength for a static load.

Fatigue failure normally occurs after a short period of repeated stress or strain cycling.

Fatigue failure is more likely to occur under dynamic load than under static load.

For fatigue to occur, the stress in the material must be compressive in nature.

Fatigue failure involves significant plastic deformation associated with failure.

Fatigue failure can occur in load-bearing components/structures and biomedical implants.

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.

Fatigue failure can occur in machine components such as crankshafts, gears, and springs.

Fatigue failure is more likely to occur at loads below the yield strength of the material.