Edge distance effects on residual stress distribution around a cold expanded hole in Al 2024 alloy

Ayatollahi, M.R.; Nik, Mahdi Arian

doi:10.1016/j.commatsci.2009.01.018

Cited by 28 publications

(18 citation statements)

References 15 publications

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“…For this reason the local amplitude, depending on both the remote stress and the interference level, has been calculated and analysed. A number of Finite Element Analyses (FEA) have been carried out in order to confirm what stated above by directly following the method proposed by [6,7,13]. In Fig.…”

Section: Discussionmentioning

confidence: 96%

“…The holes cause a geometrical discontinuity, which leads to stress concentration during the loading; furthermore, the drilling operation creates rough surfaces or damages so that the fatigue life of the component may be drastically reduced. Such situation forces a compensation of the fatigue life reduction that can be obtained with different techniques such as the cold expansion [6,7] or the interference fit connections. The present paper aims at investigating the effect of the interference fit level on the fatigue life of holed plates, which can be used in riveted connections schematically sketched in Fig.…”

Section: Introductionmentioning

confidence: 99%

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Interference fit effect on holed single plates loaded with tension-tension stresses

Croccolo

Agostinis

Vincenzi

2012

Frattura Ed Integrità Strutturale

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This paper deals with the influence of interference fit coupling on the fatigue strength of holed plates. The effect was investigated both experimentally and numerically. Axial fatigue tests have been carried out on holed specimens made of high performance steel (1075MPa of Ultimate strength and 990MPa of Yield strength) with or without a pin, made of the same material, press fitted into their central hole. Three different conditions have been investigated: free hole specimens, specimens with 0.6% of nominal specific interference and specimens with 2% of nominal specific interference. The experimental stress-life (S-N) curves pointed out an increased fatigue life of the interference fit specimens compared with the free hole ones. The numerical investigation was performed in order to analyse the stress fields by applying an elastic plastic 2D simulation with a commercial Finite Element software. The stress history and distribution along the contact interference of the fitted samples indicates a significant reduction of the local stress range due to the externally applied loading (remote stress) since a residual and compressive stress field is generated by the pin insertion. SOMMARIO.In questo lavoro è stata analizzata l'influenza di un accoppiamento per interferenza sulla resistenza a fatica di piastre forate. L'effetto è stato studiato sia sperimentalmente sia numericamente. Le prove di fatica sono state condotte su provini forati in acciaio ad alte prestazioni (1075MPa di sollecitazione massima e 990MPa di snervamento) con o senza un perno dello stesso materiale, inserito per interferenza nel foro centrale. Tre diverse condizioni dei provini sono state studiate: provini con foro libero, provini con 0,6% d'interferenza specifica nominale generata dal perno e provini con 2% di interferenza specifica nominale generata dal perno. La curva di vita a fatica (S-N) ottenuta ha evidenziato un'influenza positiva dell'interferenza sulla resistenza a fatica dei provini. L'indagine numerica è stata realizzata al fine di calcolare lo stato di deformazione e sollecitazione in campo elasto-plastico su una geometria semplificata 2D del provino in esame; allo scopo è stato impiegato un software commerciale agli elementi finiti. La storia di carico e la distribuzione delle sollecitazioni intorno al foro generato sia dall'interferenza sia dal carico esterno applicato, mostra una significativa riduzione dell'ampiezza della sollecitazione locale nel caso di interferenza dovuta alla presenza di tensioni residue di compressione.

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Section: Discussionmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

Interference fit effect on holed single plates loaded with tension-tension stresses

Croccolo

Agostinis

Vincenzi

2012

Frattura Ed Integrità Strutturale

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“…Ayatollahi investigated the influence of EDR on the residual stress distribution around a cold expanded hole using a 2D finite element model. The results showed that edge distance ratios higher than 3.0 has no effect on the residual stress field [16]. A small edge distance ratio results in change of the residual stress distribution around a cold expanded hole, and it influences the hole's fatigue life.…”

Section: Introductionmentioning

confidence: 95%

Effect of edge distance ratio on residual stresses induced by cold expansion and fatigue life of TC4 plates

Liu

Yang

et al. 2013

Engineering Fracture Mechanics

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“…al. (2008), Ayatollahi and Arian Nik (2009), Maximov et al (2009), Reese et al (2009) and Yan et al (2012). Gopalakrishna et al (2010) have considered the effect of two kinds of the cold working process at different expansion levels on the fatigue life.…”

Section: Introductionmentioning

confidence: 99%

Residual strains around cold worked holes from statistical view

Pooladi¹,

Farhangdoost²

2014

10.5267/j.esm

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Cold working a hole decreases tendency of fatigue crack initiation and growth near the hole. It is due to creation of some compressive tangential residual stresses around the hole. But there are many uncertainties which affect the residual strain and residual stress field. In fact these uncertainties lead to have scatter in the test results and considering the residual strains and residual stresses as random variables. In this paper strains recorded by strain gages mounted around the hole during cold working process in seven pieces specimens, were analyzed by statistical tests and stochastic properties of mentioned random variables were obtained using SPSS software. The residual strains have been also distributed by normal probability distribution function.

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Edge distance effects on residual stress distribution around a cold expanded hole in Al 2024 alloy

Cited by 28 publications

References 15 publications

Interference fit effect on holed single plates loaded with tension-tension stresses

Interference fit effect on holed single plates loaded with tension-tension stresses

Effect of edge distance ratio on residual stresses induced by cold expansion and fatigue life of TC4 plates

Residual strains around cold worked holes from statistical view

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