Virtual Labs

1. During a fatigue test, the specimen is subjected to ____ loading.

a: Static Explanation

Explanation

b: Cyclic Explanation

Explanation

c: Impact Explanation

Explanation

d: Thermal Explanation

Explanation

2. In a rotating bending fatigue test, each point on the specimen surface experiences ____.

a: Only tensile stress Explanation

Explanation

b: Only compressive stress Explanation

Explanation

c: Alternating tensile and compressive stresses Explanation

Explanation

d: No stress Explanation

Explanation

3. Which quantity is recorded when the fatigue specimen fractures?

a: Number of cycles to failure Explanation

Explanation

b: Young's modulus Explanation

Explanation

c: Poisson's ratio Explanation

Explanation

d: Hardness number Explanation

Explanation

4. If the applied stress amplitude is increased, the fatigue life of the specimen generally ____.

a: Increases Explanation

Explanation

b: Remains unchanged Explanation

Explanation

c: Decreases Explanation

Explanation

d: Becomes infinite Explanation

Explanation

5. The S–N curve relates the applied stress to the ____.

a: Specimen diameter Explanation

Explanation

b: Number of cycles to failure Explanation

Explanation

c: Young's modulus Explanation

Explanation

d: Temperature Explanation

Explanation

6. The endurance limit of a material represents the stress below which the material can withstand ____.

a: Only one loading cycle Explanation

Explanation

b: A specified impact load Explanation

Explanation

c: An indefinitely large number of loading cycles without failure Explanation

Explanation

d: Only compressive loading Explanation

Explanation

7. Fatigue failure generally occurs due to the ____.

a: Instantaneous yielding of the entire specimen Explanation

Explanation

b: Gradual initiation and propagation of cracks under cyclic loading Explanation

Explanation

c: Melting of the material Explanation

Explanation

d: Sudden increase in temperature Explanation

Explanation

8. Which of the following generally improves the fatigue life of a component?

a: Sharp notches Explanation

Explanation

b: Poor surface finish Explanation

Explanation

c: Smooth surface finish Explanation

Explanation

d: High stress concentration Explanation

Explanation

9. Which of the following engineering components is most likely to fail due to fatigue?

a: A stationary concrete block carrying a constant load Explanation

Explanation

b: A rotating crankshaft in an automobile engine Explanation

Explanation

c: A brick resting on the ground Explanation

Explanation

d: A water storage tank under no fluctuating load Explanation

Explanation

Fatigue Test Experiment