The mechanism of the residual stress relaxation during the fatigue life of shot peened high-strength aluminum alloys was investigated. Experiments were conducted on specimens subjected to three different shot peening treatments and tested under reverse bending fatigue. x-ray diffraction (XRD) measurements were carried out to determine the initial and stabilized residual stress fields. The residual stress field created by the surface treatments has been introduced into a finite element (FE) model by means of a fictitious temperature distribution. The elastic-plastic response of the superficial layers affected by the shot peening treatments has been derived through reverse strain axial testing combined with microhardness tests and implemented in the FE model. The proposed numerical/experimental approach is able to satisfactorily predict the residual stress field evolution. Notably, relaxation has been correctly simulated in the low-cycle fatigue regime and imputed to plastic flow in compression when the superposition of compressive residual and bending stresses exceeds the local cyclic yield strength of the material. Conversely, the residual stress field remains stable at load levels corresponding to the fatigue endurance.
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e-mail: matteo.benedetti@ing.unitn.it
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January 2010
Research Papers
Numerical Simulation of Residual Stress Relaxation in Shot Peened High-Strength Aluminum Alloys Under Reverse Bending Fatigue
M. Benedetti,
M. Benedetti
Department of Materials Engineering and Industrial Technologies,
e-mail: matteo.benedetti@ing.unitn.it
University of Trento
, Via Mesiano 77, 38100 Trento, Italy
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V. Fontanari,
V. Fontanari
Department of Materials Engineering and Industrial Technologies,
University of Trento
, Via Mesiano 77, 38100 Trento, Italy
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B. D. Monelli
B. D. Monelli
Department of Materials Engineering and Industrial Technologies,
University of Trento
, Via Mesiano 77, 38100 Trento, Italy
Search for other works by this author on:
M. Benedetti
Department of Materials Engineering and Industrial Technologies,
University of Trento
, Via Mesiano 77, 38100 Trento, Italye-mail: matteo.benedetti@ing.unitn.it
V. Fontanari
Department of Materials Engineering and Industrial Technologies,
University of Trento
, Via Mesiano 77, 38100 Trento, Italy
B. D. Monelli
Department of Materials Engineering and Industrial Technologies,
University of Trento
, Via Mesiano 77, 38100 Trento, ItalyJ. Eng. Mater. Technol. Jan 2010, 132(1): 011012 (9 pages)
Published Online: December 1, 2009
Article history
Received:
January 28, 2009
Revised:
March 28, 2009
Online:
December 1, 2009
Published:
December 1, 2009
Citation
Benedetti, M., Fontanari, V., and Monelli, B. D. (December 1, 2009). "Numerical Simulation of Residual Stress Relaxation in Shot Peened High-Strength Aluminum Alloys Under Reverse Bending Fatigue." ASME. J. Eng. Mater. Technol. January 2010; 132(1): 011012. https://doi.org/10.1115/1.3184083
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