Fracture Flashcards
1
Q
Equation for stress ratio, R
A
R = Omin/Omax
O - stress
2
Q
Equation for amplitude ratio, A
A
A = Oa / Om
3
Q
Definition of fatigue limit
A
Some materials, like steel, have fatigue limits under which a material’s life is infinite (or Nf > 10^7)
4
Q
How many regions of crack nucleation
A
three regions
5
Q
Region I
A
Crack propagation depends on microstructure
