Next Article in Journal
3D Printed Acetabular Cups for Total Hip Arthroplasty: A Review Article
Previous Article in Journal
Effect of Clearances in Mill Stands on Strip End Motion During Finishing Rolling
Previous Article in Special Issue
Effect of Laser Peening Process Parameters and Sequences on Residual Stress Profiles
Article Menu

Export Article

Open AccessArticle

The Effect of Laser Peening without Coating on the Fatigue of a 6082-T6 Aluminum Alloy with a Curved Notch

Department of Industrial Engineering, University of Bologna, 47121 Forlì, Italy
*
Author to whom correspondence should be addressed.
Metals 2019, 9(7), 728; https://doi.org/10.3390/met9070728
Received: 20 May 2019 / Revised: 24 June 2019 / Accepted: 26 June 2019 / Published: 28 June 2019
(This article belongs to the Special Issue Laser Shock Processing and Related Phenomena)
  |  
PDF [6311 KB, uploaded 28 June 2019]
  |  

Abstract

Laser shock peening has established itself as an effective surface treatment to enhance the fatigue properties of metallic materials. Although a number of works have dealt with the formation of residual stresses, and their consequent effects on the fatigue behavior, the influence of material geometry on the peening process has not been widely addressed. In this paper, Laser Peening without Coating (LPwC) is applied at the surface of a notch in specimens made of a 6082-T6 aluminum alloy. The treated specimens are tested by three-point bending fatigue tests, and their fatigue life is compared to that of untreated samples with an identical geometry. The fatigue life of the treated specimens is found to be 1.7 to 3.3 times longer. Brinell hardness measurements evidence an increase in the surface hardness of about 50%, following the treatment. The material response to peening is modelled by a finite element model, and the compressive residual stresses are computed accordingly. Stresses as high as −210 MPa are present at the notch. The ratio between the notch curvature and the laser spot radius is proposed as a parameter to evaluate the influence of the notch. View Full-Text
Keywords: laser shock peening; fatigue; notch; aluminium alloys; finite element method laser shock peening; fatigue; notch; aluminium alloys; finite element method
Figures

Figure 1

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
SciFeed

Share & Cite This Article

MDPI and ACS Style

Troiani, E.; Zavatta, N. The Effect of Laser Peening without Coating on the Fatigue of a 6082-T6 Aluminum Alloy with a Curved Notch. Metals 2019, 9, 728.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Related Articles

Article Metrics

Article Access Statistics

1

Comments

[Return to top]
Metals EISSN 2075-4701 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top