Shot peening (SP) is a mechanical surface treatment commonly performed to improve the fatigue behavior through creation of compressive residual stresses close to surface and work hardening of the surface material. Notwithstanding wide application of shot peening in the industrial environment, the determination of optimal peening condition for Ti alloys is still more an art than a science, taking into account that there is not a well established method to choose the process parameters in order to enhance the fatigue behavior. In this paper a comprehensive numerical and experimental study is presented aimed at finding the optimized peening conditions based on characterization of surface layer of material after multiple impacts. The numerical simulations provide a quantitative description of shot peening effects in terms of residual stress field and thickness of work-hardened surface layer. Comparison with numerical results, obtained by means of X-ray diffraction (XRD), shows a very good correspondence. Finally the results of experimental bending fatigue tests, performed on shot peened specimens by means of Rumul Cracktronics machine, confirm that shot peening significantly increases the fatigue strength of the considered Titanium alloy.
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ASME 2010 10th Biennial Conference on Engineering Systems Design and Analysis
July 12–14, 2010
Istanbul, Turkey
Conference Sponsors:
- International
ISBN:
978-0-7918-4916-3
PROCEEDINGS PAPER
Experimental and Numerical Analysis of Fatigue Properties Improvement in a Titanium Alloy by Shot Peening
Sara Bagherifard
,
Sara Bagherifard
Politecnico di Milano, Milano, Italy
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Marco Giglio
,
Marco Giglio
Politecnico di Milano, Milano, Italy
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Lorenzo Giudici
,
Lorenzo Giudici
Politecnico di Milano, Milano, Italy
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Mario Guagliano
Mario Guagliano
Politecnico di Milano, Milano, Italy
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Sara Bagherifard
Politecnico di Milano, Milano, Italy
Marco Giglio
Politecnico di Milano, Milano, Italy
Lorenzo Giudici
Politecnico di Milano, Milano, Italy
Mario Guagliano
Politecnico di Milano, Milano, Italy
Paper No:
ESDA2010-25030, pp. 317-322; 6 pages
Published Online:
December 28, 2010
Citation
Bagherifard, S, Giglio, M, Giudici, L, & Guagliano, M. "Experimental and Numerical Analysis of Fatigue Properties Improvement in a Titanium Alloy by Shot Peening." Proceedings of the ASME 2010 10th Biennial Conference on Engineering Systems Design and Analysis. ASME 2010 10th Biennial Conference on Engineering Systems Design and Analysis, Volume 2. Istanbul, Turkey. July 12–14, 2010. pp. 317-322. ASME. https://doi.org/10.1115/ESDA2010-25030
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