Premium
Role of machining defects and residual stress on the AISI 304 fatigue crack nucleation
Author(s) -
Yahyaoui H.,
Ben Moussa N.,
Braham C.,
Ben Fredj N.,
Sidhom H.
Publication year - 2015
Publication title -
fatigue and fracture of engineering materials and structures
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.887
H-Index - 84
eISSN - 1460-2695
pISSN - 8756-758X
DOI - 10.1111/ffe.12243
Subject(s) - materials science , machining , nucleation , coalescence (physics) , residual stress , surface roughness , scanning electron microscope , composite material , stress concentration , crack closure , surface finish , ultimate tensile strength , surface integrity , metallurgy , fracture mechanics , chemistry , physics , organic chemistry , astrobiology
Machining defects as rebuilt material and dislodgement were often induced by cutting of difficult to machining AISI 304 stainless steel. Their density increases with a decreasing of cutting speed. The effect of these defects on surface topography and residual stress was evaluated by roughness and X‐ray diffraction measurements coupled with numerical simulation. The role of the rebuilt material on the distribution of fatigue crack nucleation sites was investigated by scanning electron microscope examination of post fatigue samples loaded at different imposed strain amplitudes. The association of machining defects and fatigue crack nucleation sites was attributed to the contribution of additional tensile residual stresses induced by rebuilt material rather than local stress concentration. Moreover, the fatigue crack coalescence is promoted by increasing the rebuilt material density. When the machining defect density increases from 5 to 60 particles/mm 2 , the fatigue life decreases from −22% to −65% with respect to the electropolished surface.