Test Your Fatigue Knowledge

1 / 8

We are talking about low cycle fatigue when the number of cycles to failure is less than 1000 cycles

True

False

2 / 8

What is the effect of notches compared to unnotched material?

Lower fatigue strength and unchanged tensile strength.

Lower fatigue strength and lower tensile strength.

Unchanged fatigue strength and unchanged tensile strength.

3 / 8

The fatigue life of a structure can be calculated with an accuracy of

Less than 1% on life.

Less than 10% on life.

Less than a factor 2 on life.

A factor 2 or more on life.

4 / 8

What is the stress concentration factor of a circular hole in an infinite sheet under tension?

2.5

2.73

3.0

3.36

4.0

5 / 8

What is decisive for fatigue?

Mean stress

Stress amplitudes

6 / 8

Fatigue cracks initiate much easier at the surface than in the core of a material.

True

False

7 / 8

What is the effect of mean stresses on the fatigue limit?

The fatigue limit decreases with increasing mean stress

The fatigue limit increases with increasing mean stress

There is no effect

8 / 8

Compressive residual stresses at a critical location are favourable for the fatigue behaviour.

True

False

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