Mechanical Engineering Fourth Year: Fatigue Failure and Design Quiz

What type of stress can be cyclic or random in dynamic loads?

What type of test provides useful values for material selection and component dimensioning for statically loaded components?

Which factor constantly changes in dynamic loads?

For what type of applications must components be designed to avoid permanent deformation?

What type of test is used to determine the properties obtained from the fatigue test, such as the S–N curve?

What type of failure mechanism is addressed in Chapter 4 of the text?

What is the term used to describe the failure of a material subjected to repeated loading and unloading even at low loads?

Which type of stress cycle has an amplitude symmetrical about a mean zero stress level?

What type of stresses are required for fatigue to occur in a material?

What kind of deformation is associated with fatigue failure in materials?

In which components/structures is fatigue failure a common phenomenon?

What type of load results in lower strength limits under dynamic load than under static load?

What is the nature of fatigue failure?

In what direction is the fracture surface usually oriented in fatigue failure?

In which machine components does fatigue failure occur?

What type of implants can experience fatigue failure?

The intensity of stress in tensile, compression, and bending tests increases slowly but steadily until the load finally fractures the specimen.

Components are always subjected to dynamic loads with constantly changing stress intensity and direction.

The dynamic stress in components can only be cyclic and never random.

Fatigue failure criteria is mainly affected by a few factors.

The applied load on the material must cause permanent deformation in service applications.

The S-N curve is used to determine the properties obtained from static load tests.

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

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

The strength limits to be met under dynamic load are higher than under static load.

For fatigue to occur, at least part of the stress in the material has to be compressive.

Fatigue failure can occur due to flexural, torsional, or compressive stress cycles.

Fatigue failure is gradual and gives ample warning before occurring.

Fatigue failure involves significant plastic deformation before failure.

Fatigue failure is only common in load-bearing components and structures.

Fatigue failure only occurs in components subjected to stresses above the yield strength of the material.

Reversed (pure alternating) stress cycle has asymmetric amplitude about a mean zero stress level.