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Role of machining defects and residual stress on the AISI 304 fatigue crack nucleation

Article dans une revue avec comité de lecture
Author
YAHYAOUI, Houda
BEN MOUSSA, Naoufel
SIDHOM, H
BEN FREDJ, N
ccBRAHAM, Chedly
86289 Laboratoire Procédés et Ingénierie en Mécanique et Matériaux [PIMM]

URI
http://hdl.handle.net/10985/9901
DOI
10.1111/ffe.12243
Date
2015
Journal
Fatigue and Fracture of Engineering Materials and Structures

Abstract

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/mm2, the fatigue life decreases from -22% to -65% with respect to the electropolished surface. © 2014 Wiley Publishing Ltd.

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