The present paper is aimed at investigating the effect of shot peening on the high and very-high cycle plain fatigue resistance of the Al-7075-T651 alloy. Pulsating bending fatigue tests (R = 0.05) were carried out on smooth samples exploring fatigue lives comprised between 105 and 108 cycles. Three peening treatments were considered to explore different initial residual stress profiles and surface microstruc- tural conditions. An extensive analysis of the residual stress field was carried out by measuring with the X-ray diffraction (XRD) technique the residual stress profile before and at the end of the fatigue tests. Fatigue crack initiation sites were investigated through scanning electron microscopy (SEM) fractogra- phy. The surface morphology modifications induced by shot peening were evaluated using an optical pro- filometer. The influence of surface finishing on the fatigue resistance was quantified by eliminating the surface roughness in some peened specimens through a tribofinishing treatment. The capability of shot peening to hinder the initiation and to retard the subsequent propagation of surface cracks is discussed on the basis of a model combining a multiaxial fatigue criterion and a fracture mechanics approach.

High- and very high-cycle plain fatigue resistance of shot peened high-strength aluminum alloys: The role of surface morphology / Benedetti, Matteo; Fontanari, Vigilio; M., Bandini; E., Savio. - In: INTERNATIONAL JOURNAL OF FATIGUE. - ISSN 0142-1123. - STAMPA. - 70:(2015), pp. 451-462. [10.1016/j.ijfatigue.2014.07.002]

High- and very high-cycle plain fatigue resistance of shot peened high-strength aluminum alloys: The role of surface morphology

Benedetti, Matteo;Fontanari, Vigilio;
2015-01-01

Abstract

The present paper is aimed at investigating the effect of shot peening on the high and very-high cycle plain fatigue resistance of the Al-7075-T651 alloy. Pulsating bending fatigue tests (R = 0.05) were carried out on smooth samples exploring fatigue lives comprised between 105 and 108 cycles. Three peening treatments were considered to explore different initial residual stress profiles and surface microstruc- tural conditions. An extensive analysis of the residual stress field was carried out by measuring with the X-ray diffraction (XRD) technique the residual stress profile before and at the end of the fatigue tests. Fatigue crack initiation sites were investigated through scanning electron microscopy (SEM) fractogra- phy. The surface morphology modifications induced by shot peening were evaluated using an optical pro- filometer. The influence of surface finishing on the fatigue resistance was quantified by eliminating the surface roughness in some peened specimens through a tribofinishing treatment. The capability of shot peening to hinder the initiation and to retard the subsequent propagation of surface cracks is discussed on the basis of a model combining a multiaxial fatigue criterion and a fracture mechanics approach.
2015
Benedetti, Matteo; Fontanari, Vigilio; M., Bandini; E., Savio
High- and very high-cycle plain fatigue resistance of shot peened high-strength aluminum alloys: The role of surface morphology / Benedetti, Matteo; Fontanari, Vigilio; M., Bandini; E., Savio. - In: INTERNATIONAL JOURNAL OF FATIGUE. - ISSN 0142-1123. - STAMPA. - 70:(2015), pp. 451-462. [10.1016/j.ijfatigue.2014.07.002]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11572/98120
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