API 571 Mechanical Fatigue

Mechanical fatigue is caused by:

cyclic stresses occurring over a long period of time
What materials are affected by Mechanical fatigue?

All materials - the number of cycles necessary to cause failure vary per material.
Fatigue will NOT occur in carbon steel if stresses are below what?

Endurance limit
What conditions contribute to Mechanical fatigue?
- Temperature - Not a factor
- Steel Properties - Dirty Steel
- Grain Structure - Coarse-grain
- Surface Condition - Notches
- Process pH - Not a factor
The endurance limit is usually about:

40-50% of a materials ultimate tensile strength
What material does not have an endurance limit?

Stainless steel
Mechanical fatigue can cause cracks that initiate from the surface and often form what?

clam shell appearance
The best defense against mechanical fatigue is a:

Good design that minimizes stress concentrations
Inspecting for high-cycle fatigue can be difficult since:

once the crack begins, only a few cycles are needed for the crack to lead to failure.

Author

Gibby

333975

Card Set

API 571 Mechanical Fatigue

Description

API 571 Mechanical Fatigue

Updated

2017-09-06T02:25:33Z

Show Answers