Creep Relaxation of Residual Stresses Around Cold Expanded Holes
Source abstract
Abstract
The cold expansion of fastener holes in aircraft components is a standard technique to improve fatigue life. There is concern that the beneficial residual stresses arising from cold expansion may relax due to creep. This paper describes experimental measurement and finite element prediction of cold expansion residual stresses and their redistribution after creep, with and without additional mechanical load. Experimental measurements of near-surface stresses used an X-ray diffraction technique while average through-the-thickness stresses were measured using a new method based on Sachs’ boring. This new method allowed non-axisymmetric residual stresses to be measured, as was the case when creep relaxation occurred with mechanical load. Axisymmetric and three dimensional finite element analyses were used to predict the stress distribution through the thickness of the component showing good agreement with measurement. Creep relaxation of residual stress does indeed occur, but some benefit of the cold expansion remains, particularly when creep relaxation is combined with the application of mechanical load.
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Research context
OpenAlex topics: Fatigue and fracture mechanics · High Temperature Alloys and Creep · Fire effects on concrete materials
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Department of Mechanical Engineering, University of Bristol, Bristol BS8 1TR, United Kingdom
Defence and Evaluation Research Agency, Farnborough, United Kingdom
References (20)
Show source-provided references
1. Petrak, G. J., and Stewart, R. P., 1974, “Retardation of cracks emanating from fastener holes,” Eng. Fract. Mech., 6, pp. 275–282.10.1016/0013-7944(74)90025-3 ↗
2. Pavier, M. J., Poussard, C. G. C., and Smith, D. J., 1997, “A finite element simulation of the cold working process for fastener holes,” J. Strain Anal., 32, pp. 287–300.10.1243/0309324971513418 ↗
3. Smith, D. J., Poussard, C. G. C., and Pavier, M. J., 1998, “An assessment of the Sachs method for measuring residual stresses in cold worked fastener holes,” J. Strain Anal., 33, pp. 263–274.10.1243/0309324981512986 ↗
4. Zhu, L., Tao, X. Y., and Cengdian, L., 1998, “Fatigue strength and crack propagation life of in-service high pressure tubular reactor under residual stress,” Int. J. Pressure Vessels Piping, 75, pp. 871–878.10.1016/S0308-0161(98)00088-X ↗
5. Ternay, F., Burlet, H., and Robert, G., 1998, “Fatigue and creep fatigue crack growth behavior of alloy 00 at 550°C,” International HIDA Conference: Creep and Fatigue Crack Growth in High Temperature Plant, Paris, France, 15–17 Apr., Report S-1-8.10.1080/09603409.1998.11689597 ↗
6. Rudin, A. C. , 1993, “Extending the fatigue life of aircraft engine components by hole cold expansion technology,” ASME J. Eng. Gas Turbines Power, 115, pp. 165–171.10.1115/1.2906672 ↗
7. Polmear, I. J., Pons, G., Octor, H., Sanchez, C., Morton, A., Borbridge, W., and Rogers, S., 1996, “After Concorde: Evaluation of an Al-Cu-Mg-Ag Alloy for Use in the Proposed European SST,” Mater. Sci. Forum, 217–222, pp. 1759–1764.10.4028/www.scientific.net/MSF.217-222.1759 ↗
8. Chen, P. C. T. , 1986, “The Bauschinger and hardening effect on residual stresses in an autofrettaged thick-walled cylinder,” ASME J. Pressure Vessel Technol., 108, pp. 108–112.10.1115/1.3264743 ↗
9. Ashby, M. F., and Frost, H. J., 1982, Deformation Mechanisms. The Plasticity and Creep of Metals and Ceramics, Pergamon Press, UK.
10. Priest, M., Smith, D. J., Poussard, C. G. C., and Pavier, M. J., 1997, “An assessment of measured and predicted residual stresses around cold worked holes in Al 2024,” Exp. Mech., 35, pp. 361–366.10.1007/BF02317546 ↗
11. FTI, 1991, “Extending the fatigue life of metal structures,” Materials Testing, Fatigue Technology Inc., 150 Andover Park West, Seattle, WA.
12. Garcia-Granada, A. A., Smith, D. J., and Pavier, M. J., 2000, “A new procedure based on Sachs’ boring for measuring non axisymmetric residual stress,” Int. J. Mech. Sci., 42, pp. 1027–1047.10.1016/S0020-7403(99)00039-9 ↗
13. Holdway, P., Cook, R., and Bowen, A. W., 1994, “Mapping of residual stresses around fastener holes in high strength aluminum alloy,” Surf. Eng., 10, pp. 292–296.10.1179/sur.1994.10.4.292 ↗
14. Leon, A. , 1998, “Benefits of split mandrel coldworking,” Int. J. Fatigue, 20, pp. 1–8.10.1016/S0142-1123(97)00059-5 ↗
15. Garcia-Granada, A. A., Lararac, V., Smith, D. J., Pavier, M. J., Cook, R., and Holdway, P., 1999, “3D residual stresses around cold expanded holes in a new creep resistant aluminium alloy,” Proceedings of the 4th International Conference on Computer Methods and Experimental Measurements for Surface Treatment Effects, pp. 103–116, 20–22 Sept., Assissi, Italy.
16. Sachs, G. , 1927, “Der nachweis immerer spannungen in stagen und rohren,” Z. Metallkd., 19, pp. 352–357.10.1515/ijmr-1927-191-12126 ↗
17. Pavier, M. J., Poussard, C. G. C., and Smith, D. J., 1998, “Finite element modelling of the interaction of residual stress with mechanical load for a crack emanating from a cold worked fastener hole,” J. Strain Anal., 33, pp. 275–289.10.1243/0309324981512995 ↗
18. Papanikos, P., and Meguid, S. A., 1998, “Three-dimensional analysis of cold expansion of adjacent holes,” Int. J. Mech. Sci., 40, pp. 1019–1028.10.1016/S0020-7403(98)00007-1 ↗
19. Pavier, M. J., Poussard, C. G. C., and Smith, D. J., 1999, “Effect of residual stress around cold worked holes on fracture under superimposed mechanical load,” Eng. Fract. Mech., 63, pp. 751–773.10.1016/S0013-7944(99)00050-8 ↗
20. Pell, R. A., Beaver, P. W., Mann, J. Y., and Sparrow, J. G., 1989, “Fatigue of thick-section cold-expanded holes with and without cracks,” Fatigue Fract. Eng. Mater. Struct., 12, pp. 553–567.10.1111/j.1460-2695.1989.tb00563.x ↗