Fretting-Fatigue Analysis of Shot-Peened Al 7075-T651 Test Specimens
Shot peening is a mechanical treatment that induces several changes in the material: surface roughness, increased hardness close to the surface, and, the most important, compressive residual stresses. This paper analyzes the effect of this treatment on alloy Al 7075-T651 in the case of fretting fati...
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| Format: | Article |
| Language: | English |
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MDPI AG
2019-05-01
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| Series: | Metals |
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| Online Access: | https://www.mdpi.com/2075-4701/9/5/586 |
| _version_ | 1818927933085974528 |
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| author | Vicente Martín Jesús Vázquez Carlos Navarro Jaime Domínguez |
| author_facet | Vicente Martín Jesús Vázquez Carlos Navarro Jaime Domínguez |
| author_sort | Vicente Martín |
| collection | DOAJ |
| description | Shot peening is a mechanical treatment that induces several changes in the material: surface roughness, increased hardness close to the surface, and, the most important, compressive residual stresses. This paper analyzes the effect of this treatment on alloy Al 7075-T651 in the case of fretting fatigue with cylindrical contact through the results of 114 fretting fatigue tests. There are three independent loads applied in this type of test: a constant normal load <i>N</i>, pressing the contact pad against the specimen; a cyclic bulk stress <i>σ</i> in the specimen; and a cyclic tangential load <i>Q</i> through the contact. Four specimens at each of 23 different combinations of these three parameters were tested—two specimens without any treatment and two treated with shot peening. The fatigue lives, contact surface, fracture surface, and residual stresses and hardness were studied. Improvement in fatigue life ranged from 3 to 22, depending on fatigue life. The relaxation of residual-stress distribution related to the number of applied cycles was also measured. Finally, another group of specimens treated with shot peening was polished and tested, obtaining similar lives as in the tests with specimens that were shot-peened but not polished. |
| first_indexed | 2024-12-20T03:20:53Z |
| format | Article |
| id | doaj.art-32b4f6d8e5b149dfb9ce124a233578f7 |
| institution | Directory Open Access Journal |
| issn | 2075-4701 |
| language | English |
| last_indexed | 2024-12-20T03:20:53Z |
| publishDate | 2019-05-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Metals |
| spelling | doaj.art-32b4f6d8e5b149dfb9ce124a233578f72022-12-21T19:55:14ZengMDPI AGMetals2075-47012019-05-019558610.3390/met9050586met9050586Fretting-Fatigue Analysis of Shot-Peened Al 7075-T651 Test SpecimensVicente Martín0Jesús Vázquez1Carlos Navarro2Jaime Domínguez3Department of Mechanical Engineering, University of Seville, 41004 Sevilla, SpainDepartment of Mechanical Engineering, University of Seville, 41004 Sevilla, SpainDepartment of Mechanical Engineering, University of Seville, 41004 Sevilla, SpainDepartment of Mechanical Engineering, University of Seville, 41004 Sevilla, SpainShot peening is a mechanical treatment that induces several changes in the material: surface roughness, increased hardness close to the surface, and, the most important, compressive residual stresses. This paper analyzes the effect of this treatment on alloy Al 7075-T651 in the case of fretting fatigue with cylindrical contact through the results of 114 fretting fatigue tests. There are three independent loads applied in this type of test: a constant normal load <i>N</i>, pressing the contact pad against the specimen; a cyclic bulk stress <i>σ</i> in the specimen; and a cyclic tangential load <i>Q</i> through the contact. Four specimens at each of 23 different combinations of these three parameters were tested—two specimens without any treatment and two treated with shot peening. The fatigue lives, contact surface, fracture surface, and residual stresses and hardness were studied. Improvement in fatigue life ranged from 3 to 22, depending on fatigue life. The relaxation of residual-stress distribution related to the number of applied cycles was also measured. Finally, another group of specimens treated with shot peening was polished and tested, obtaining similar lives as in the tests with specimens that were shot-peened but not polished.https://www.mdpi.com/2075-4701/9/5/586fretting fatigueshot peeningAl 7075-T651residual-stress relaxation |
| spellingShingle | Vicente Martín Jesús Vázquez Carlos Navarro Jaime Domínguez Fretting-Fatigue Analysis of Shot-Peened Al 7075-T651 Test Specimens Metals fretting fatigue shot peening Al 7075-T651 residual-stress relaxation |
| title | Fretting-Fatigue Analysis of Shot-Peened Al 7075-T651 Test Specimens |
| title_full | Fretting-Fatigue Analysis of Shot-Peened Al 7075-T651 Test Specimens |
| title_fullStr | Fretting-Fatigue Analysis of Shot-Peened Al 7075-T651 Test Specimens |
| title_full_unstemmed | Fretting-Fatigue Analysis of Shot-Peened Al 7075-T651 Test Specimens |
| title_short | Fretting-Fatigue Analysis of Shot-Peened Al 7075-T651 Test Specimens |
| title_sort | fretting fatigue analysis of shot peened al 7075 t651 test specimens |
| topic | fretting fatigue shot peening Al 7075-T651 residual-stress relaxation |
| url | https://www.mdpi.com/2075-4701/9/5/586 |
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