Multiple-Choice Questions (MCQs)

Front

What is fatigue in materials science?

Back

A phenomenon where a material fails under repeated cyclic loading

Front

What type of loading primarily causes fatigue failure? Options: Static loading, Cyclic loading, Impact loading, Thermal loading

Back

Cyclic loading

Front

Which of the following is NOT a stage of fatigue failure? Crack initiation, Crack propagation, Sudden rupture, Creep deformation

Back

Creep deformation

Front

Where do fatigue cracks usually initiate?

Back

On the surface due to stress concentrations

Front

What is the endurance limit in fatigue?

Back

The stress level below which a material can endure an infinite number of cycles

Front

Which of the following factors affects fatigue life the most? Temperature only, Surface roughness, stress amplitude, and environment, Density of the material, Grain size only

Back

Surface roughness, stress amplitude, and environment

Front

What type of materials exhibit a well-defined endurance limit? Options: Aluminum and copper alloys, Ferrous alloys such as steels, Polymers, Ceramics

Back

Ferrous alloys such as steels

Front

What is the term for the number of cycles a material can withstand before failure?

Back

Fatigue life

Front

Increasing surface roughness affects fatigue life by:

Back

Decreasing fatigue life

Front

What is the effect of stress concentration on fatigue life?

Back

Decreases fatigue life