Fatigue ductility

Fatigue ductility Fatigue failure Fatigue limit Fatigue strength... 

Influence of active environments on rupture, fatigue, ductile-... 

Here As/2 = total strain amplitude, Ase/2 = elastic strain amplitude = a/(IE), Asp/2 = plastic strain amplitude = As/2 - AsJ2 = Ae/2 - a/(2E), Si = fatigue ductility coefficient (related to fracture strain in a monotonic tensile test), and cTf = fatigue strength coefficient (related to fracture stress in a mono tonic tensile test). 

For the fatigue ductility coefficient ej, the true fracture strain in tensile loading can be used as a good approximation. The fatigue ductility exponent b depends on the hardening of the material. Typical values for b are in the range of 0.4 to 0.73 [113,130]. 

Strain hardening exponent of the material n is needed together with the fatigue strength coefficient a f and the fatigue ductility coefficient f. these last two coefficient have been already calculated in sample problem 1. of Sect. 5.3 and are... 

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