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Cold work simulation of hole expansion process and its effect on crack closure | ||
| Iranian Journal of Materials Forming | ||
| مقاله 2، دوره 1، شماره 1، تیر 2014، صفحه 11-23 اصل مقاله (826.79 K) | ||
| نوع مقاله: Research Paper | ||
| شناسه دیجیتال (DOI): 10.22099/ijmf.2014.2276 | ||
| نویسندگان | ||
| Mehrdad Aghaie-khafri* 1؛ Mohamad-Hossen Gozin2 | ||
| 1Khajenasir University of Technology | ||
| 2Khajenasir university of Technology | ||
| چکیده | ||
| Using cold working fastener holes is a simple life enhancement procedure that strengthens metallic components by retarding crack growth around a hole. In the present paper, the residual stress field that is induced by the hole expansion process is obtained based on different material models namely elastic perfect plastic, isotropic hardening and kinematic hardening using three-dimensional finite element method. Moreover, crack closure analysis was performed following introduction of residual stress. The effect of modeling parameters such as percent of cold work, remote tensile stress and crack length is considered. Crack closure analysis indicates that the material model would affects normalized crack opening loads especially at low level of remote tensile stress where small scale yielding is dominant. Cold work simulation results indicate that the residual stress variation through the thickness is considerable. At low stress level, the effect of material behavior model is considerable and at high stress levels the crack opening load is dropped. Moreover, increasing the cold work interference percent results in a higher and deeper compressive residual stress. | ||
| کلیدواژهها | ||
| material behavior؛ cold work؛ Residual Stress؛ finite elements | ||
| مراجع | ||
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[1] J.P. Gallagher, F.J. Giessler, A.P. Berens. USAF Damage tolerance design handbook: Guidelines for the analysis and design of damage tolerant aircraft structures. USAF systems command, Wright-Patterson Air Force Base, OH, USA, 1984. [2] FTI, Cold Expansion Holes Using the Standard Split Sleeve System and Countersink Cold Expansion, Fatigue Technology Inc., Seattle, WA, USA, 2002. [3] FTI, Extending the Fatigue Life of Metal Structures, Materials Testing, Fatigue Technology Inc., Seattle, WA, USA, 1991. [4] P.M.G.P. Moreira, P.F.P. de Matos, S.T. Pinho, S.D. Pastramˇa, P.P. Camanho, P.M.S.T. de Castro, The residual stress intensity factors for cold worked cracked holes: a technical note, Fatigue and Fracture of Engineering Material and Structures, 27 (2004) 879-886. [5] P.F.P. De Matos, P.M.G.P. Moreira, P.P. Camanho, P.M.S.T. de Castro, Numerical simulation of cold working of rivet holes, Finite Element in Analysis and Design, 41 (2005) 989-1007. [6] W. Elber, Fatigue crack closure under cyclic tension, Engineering Fracture Mechanics, 2 (1970) 37-45. [7] S.S. Carlson, Application of beta corrections to model and predict fatigue crack growth at cold expanded holes in 2024-T351 Aluminum alloys, M.Sc. Thesis, University of Utah, 2008. [8] B. Clausen, M.B. Prime, S. Kabra, D.W. Brown, P. Pagliaro. Residual stress and plastic anisotropy in indented 2024-T351 aluminum disks, Proceedings of the SEM Annual Conference and Exposition on Experimental and Applied Mechanics, (2009) 1639-1646. [9] J. Lemaitre, J.L. Chaboche,. Mechanics of solid materials, Cambridge University Press, Cambridge, 1990. [10] M.J. Pavier, C.G.C. Poussard, D.J. Smith, A finite element simulation of the cold working process for fastener holes, Journal of Strain Analysis for Engineering Design, 32 (1997) 287-300. [11] M.J. Pavier, C.G.C. Ponssard, D.J. Smith, Finite element modeling of the interaction of residual stress with mechanical load for a crack emanating from a cold worked fastener hole, Journal of Strain Analysis for Engineering Design, 33 (1998) 275-289. [12] M.J. Pavier, C.G.C. Poussard, D.J. Smith, Effect of residual stress around cold worked holes on fracture under superimposed mechanical load, Engineering Fracture Mechanics, 63 (1999) 751-773. [13] E.W. O’Brien, Beneficial residual stress from the cold expansion of large holes in thick light alloy plate, Journal of Strain Analysis for Engineering Design, 35 (2000) 261-276. [14] M.H. Gozin, M. Aghaie-Khafri, 2D and 3D finite element analysis of crack growth under compressive residual stress field, International journal of solid and structures, 49 (2012) 3316-3322. | ||
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