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Mechanical Fatigue is caused by:
Cyclic stresses occurring over a long period of time
Which of the following materials are affected by Mechanical Fatigue?
A) Only carbon steel
B) Only carbon steel, and high nickel alloys C) All materials
D) Only carbon steel and chromes
C) All materials
(this multiple choice question has been scrambled)
Fatigue will not occur in carbon steel if stresses are below the:
Which condition contributes to Mechanical Fatigue.
A) Temperature:Low temps/High temps/ Not a factor.
B)Steel properties:Dirty steels/Clean steel/Not a factor
C)Grain structure:Fine-grain/Coarse-grain/Not a factor
D)Surface Condition:Notches/Smooth surface/Not a factor
E)Process ph:High ph/Low ph/Not a factor
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 material's ultimate tensile strength
Which material does not have an endurance limit
Mechanical Fatigue can cause cracks that initiate from the surface and often form a :
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