Numerical study of the optimum degree of cold expansion: Application for the pre-cracked specimen with the expanded hole at the crack tip

Amrouche, Abdelwaheb; Su, Meini; Aid, A.; Mesmacque, G.

doi:10.1016/j.jmatprotec.2007.06.030

Cited by 19 publications

(10 citation statements)

References 8 publications

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“…The DCE was 4.5%. 9 We note that at 20% of the process, stresses are tensile; at 60%, stresses reach the maximum value in tension (408 MPa) and at 100%, stresses are compression and to about 2300 MPa at the exit face of the pin. The maximum stress has been recorded in an area between the mid-depth and the exit face of the specimen.…”

Section: Numerical Simulationmentioning

confidence: 76%

Numerical study of the effect of double cold expansion of rivet hole on the residual stresses distribution

Elajrami

Miloud

Melouki³

et al. 2013

Proceedings of the Institution of Mechanical Engineers, Part B:

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The hardening of rivet hole is a mechanical process used to reduce the level of the resulting stresses due to loading in order to delay the crack initiation and propagation. This technique is used to improve fatigue life and to increase the intervals between structural inspections. The experimental tests have shown that the low residual stresses resulting from cold expansion and the first fatigue cracks are located at the entrance face used for hardening. To solve this problem, a double cold expansion of rivet hole in the opposite direction is proposed. This article presents the results of three-dimensional finite element simulation of double cold expansion process in the opposite direction using Abaqus software. The residual stress distribution in rivet hole of aluminum alloy Al2024-T3 induced by tapered pin was analyzed. The obtained results show that the residual stresses vary through the material depth, are maximal in mid-depth and are strong at the exit face and moderate at the entrance face. They also show that the double cold expansion in the opposite direction increases the residual stresses at the entrance face of the pin, and these stresses reached the values of those generated on the exit face, enhancing the fatigue life.

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Section: Numerical Simulationmentioning

confidence: 76%

Numerical study of the effect of double cold expansion of rivet hole on the residual stresses distribution

Elajrami

Miloud

Melouki³

et al. 2013

Proceedings of the Institution of Mechanical Engineers, Part B:

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“…The experimental results were compared to the damage calculated by the Miner's rule 15 and a new simple fatigue damage indicator 'damaged stress model' [16][17][18][19][20] . The results are given in Tables 5, 6 and illustrated in Figure 7.…”

Section: Results and Analysismentioning

confidence: 99%

“…Both aspects are illustrated in Figures 2 and 3 [17,20] . The geometry effect on the residual stresses distribution at the crack tip was study little.…”

Section: General Principle Of the Methodsmentioning

confidence: 99%

Effect of hardening induced by cold expansion on damage fatigue accumulation and life assessment of Aluminum alloy 6082 T6

et al. 2012

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Hole cold expansion (HCE) is an effective method to extend the fatigue life of mechanical structures. During cold expansion process compressive residual stresses around the expanded hole are generated. The enhancement of fatigue life and the crack initiation and growth behavior of a holed specimen were investigated by using the 6082 Aluminum alloy. The present study suggests a simple technical method for enhancement of fatigue life by a cold expansion hole of pre-cracked specimen. Fatigue damage accumulation of cold expanded hole in aluminum alloy which is widely used in transportation and in aeronautics was analyzed. Experimental tests were carried out using pre-cracked SENT specimens. Tests were performed in two and four block loading under constant amplitude. These tests were performed by using two and four blocks under uniaxial constant amplitude loading. The increasing and decreasing loading were carried. The experimental results were compared to the damage calculated by the Miner's rule and a new simple fatigue damage indicator. This comparison shows that the 'damaged stress model', which takes into account the loading history, yields a good estimation according to the experimental results. Moreover, the error is minimized in comparison to the Miner's model.

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“…The cold working expansion process was realized by forcing a hard steel ball of 6 mm inside a predrilled hole(the initial diameters of the hole are: 5.9, 5.8 and 5.75 mm, see Figure 3). The degree of expansion is calculated as follows [14]:…”

Section: Fatigue Tests and Cold Expansionmentioning

confidence: 99%

Finite Element Method Investigation of the Effect of Cold Expansion Process on Fatigue Crack Growth in 6082 Aluminum Alloy

Aid¹,

Semari²,

Benguediab³

2014

MNSMS

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Cold expansion is an efficient way to improve the fatigue life of an open hole. In this paper, three finite element models have been established to crack growth from an expanded hole which is simulated. Expansion and its degree influence are studied using a numerical analysis. Stress intensity factors are determined and used to evaluate the fatigue life. The residual stress field is evaluated using a nonlinear analysis and superposed with the applied stress field in order to estimate fatigue crack growth. Experimental test is conducted under constant loading. The results of this investigation indicate that expansion and its degree are a benefit of fatigue life and a good agreement was observed between FEM simulations and experimental results.

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Numerical study of the optimum degree of cold expansion: Application for the pre-cracked specimen with the expanded hole at the crack tip

Cited by 19 publications

References 8 publications

Numerical study of the effect of double cold expansion of rivet hole on the residual stresses distribution

Numerical study of the effect of double cold expansion of rivet hole on the residual stresses distribution

Effect of hardening induced by cold expansion on damage fatigue accumulation and life assessment of Aluminum alloy 6082 T6

Finite Element Method Investigation of the Effect of Cold Expansion Process on Fatigue Crack Growth in 6082 Aluminum Alloy

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