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Fatigue life improvement in fatigue-aged fastener holes using the cold expansion technique

By Xiang Zhang and Z. Wang


The use of cold expansion process as a life extension technique on aircraft structural joints was investigated. The primary focus was an experimental test programme consisting of open-hole and low-load transfer joint specimens made of 2024-T351 aluminium alloy and pre-fatigued to 25, 50 and 75% of the baseline fatigue life for plain holes. The FALSTAFF loading spectrum was applied. The results indicate that significant life improvements can be obtained through cold expansion applied at all percentages of fatigue life tested in this work with the optimum stage being around 25% of the baseline life. The major life extension was obtained through slower crack growth in the short crack stage. The life improvement factors for the open-hole and joint specimens were comparable provided that the degree of cold expansion is the same. Crack growth life of the open-hole specimen was predicted by employing an analytical residual stress model and the AFGROW computer code. The prediction results showed good agreement with the experimental results for cold expansion at build cases

Topics: Fastener holes, Cold expansion, Residual stress
Publisher: Elsevier Science B.V., Amsterdam.
Year: 2003
DOI identifier: 10.1016/S0142-1123(03)00152-X
OAI identifier:
Provided by: Cranfield CERES

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  1. (1993). 3-D axisymmetric numerical analysis and experimental study of the fastener hole coldworking process. Computer Methods and Experimental Measurements for Surface Treatment Effects,
  2. (2002). A study on predicting fatigue crack growth life for cold-worked holes based on different closed-form residual stress models. doi
  3. (1999). AFGROW Users Guide and
  4. (1995). An assessment of residual stress measurements around cold-worked holes. Experimental Mechanics, doi
  5. (1992). Beneficial effects of split sleeve cold expansion TM on the fatigue lives of pre-cycled cold expanded structure.
  6. (1995). Effect of re-coldworking on fatigue life enhancement of a fastener hole. Fatigue Fract. doi
  7. (1975). Elastic-plastic analysis of an infinite sheet having a circular hole under pressure. doi
  8. (1995). Elastic-plastic stress analysis of cold expanded fastener holes. doi
  9. (1987). Expansion of cracked fastener holes as a measure for extension of lifetime to repair. Engineering Fracture Mechanics. doi
  10. (1998). Experimental investigation on the effectiveness of cold expansion of fastener holes. doi
  11. (1977). Fatigue analysis of cold-worked and interference fit fastener holes. Cyclic Stress-Strain and Plastic Deformation Aspect of Fatigue Crack Growth, doi
  12. (2000). Fatigue life benefits of part-life cold expansion. MSc Thesis, College of Aeronautics,
  13. (1999). Fatigue Life Extension Through Cold Expansion.
  14. (1998). Fatigue Life Extension Through Cold Expansion. MSc Thesis, College of Aeronautics,
  15. (1989). Fatigue of Aluminium Alloy Joints with Various Fastener Systems, Low Load Transfer,
  16. (1975). Introduction to a Fighter Aircraft Loading Standard for Fatigue Evaluation,
  17. (2000). Life enhancement of fatigue aged fastener holes using cold expansion process, Proc Instn Mech Engrs Part G: J of Aerospace Engng. doi
  18. (1994). Method for Measurement of Fatigue Crack Growth Rates - E647. doi
  19. (1977). Prediction of fatigue crack growth at cold-worked fastener holes. doi
  20. (1997). Repair of cracked holes using cold expansion. Computer Methods and Experimental Measurements for Surface Treatment Effects,
  21. (1993). Residual stresses induced by hole cold expansion. Computer Methods and Experimental Measurements for Surface Treatment Effects,
  22. (1974). Sleeve coldworking fastener holes,
  23. (1993). Split sleeve cold expansion as a rework process for previously cold expanded holes.
  24. (1987). Standard Fatigue Test Specimens for Fastener Evaluation.
  25. Total fatigue life calculations in notched SAE 0030 cast steel under variable loading spectra. doi

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