Effects of Brushing and Shot-Peening Residual Stresses on the Fatigue Resistance of Machined Metal Surfaces: Experimental and Predicting Approaches

Naziha Sidhom; Habib Sidhom; Chedly Braham; Jean Lédion

doi:10.4028/www.scientific.net/MSF.681.290

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HomeMaterials Science ForumMaterials Science Forum Vol. 681Effects of Brushing and Shot-Peening Residual...

Effects of Brushing and Shot-Peening Residual Stresses on the Fatigue Resistance of Machined Metal Surfaces: Experimental and Predicting Approaches

Abstract:

Mechanical brushing of machined AA5083H11 surface, performed in optimized conditions of brush wire hammering, generates distributions of compressive residual stresses. These distributions are controlled by the process parameters such as the pressure of the brush wires on the surface, the speed of rotation or the number of passes. X-ray diffraction (XRD) measurements relative to different surface preparations show that the stresses due to brushing are less deep and that the maximal values in compression are the same as the ones from shallow shot-peening treatment (without defects). Moreover, the bushing provides high quality surface at a microscopic scale (low roughness) and integrity state of the treated surfaces, better for cyclic stability of compressive stresses. The stabilized state of residual stresses resulting from brushing and shot-peening is determined by finite element analysis. These analyses are experimentally validated by XRD using the psi-tilt method on tested fatigue specimens. Fatigue results show that the good surface topography generated by the wire brushing process compensates the reduction of the amplitude and the depth of the compressive residual stress profiles compared to shot-peening so that it could provide an equivalent fatigue improvement rate (20 to 30% of σ_D2.10⁶cycles) of the AA5083H11.

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Periodical:

Materials Science Forum (Volume 681)

Pages:

290-295

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.681.290

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Online since:

March 2011

Authors:

Naziha Sidhom, Habib Sidhom, Chedly Braham, Jean Lédion

Keywords:

Fatigue, Shot Peening, Wire Brushing

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