Journal of Failure Analysis and Prevention

, Volume 5, Issue 6, pp 25–29 | Cite as

Stresses in bent copper tubing: Application to fatigue and stress-corrosion cracking failure mechanisms

  • M. E. Stevenson
  • J. L. McDougall
  • M. E. Barkey
Case Histories

Abstract

The residual and applied stresses in u-bent copper tubing are addressed in the context of both cyclic fatigue and stress-corrosion cracking. Failures as a result of fatigue and stress corrosion cracking in u-bent copper tubing have been observed to initiate at nonintuitive locations when only the applied stresses on the component are considered. This paper presents both qualitative classical and quantitative finite-element stress analysis results for the forming of u-bends. The resulting residual stress distributions are compared to fracture patterns generated by both fatigue and stress-corrosion cracking mechanisms.

Keywords

copper fatigue metal forming residual stresses stress-corrosion cracking 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. 1.
    D.H. Duffner: “Air Conditioner Failure Investigation—Intergranular Cracking in a Pure Copper Condenser Tube,” J. Failure Analysis and Prevention, 2005, 5(1), pp. 79–85.CrossRefGoogle Scholar
  2. 2.
    J.L. McDougall and M.E. Stevenson: “Stress-Corrosion Cracking in Copper Refrigerant Tubing,” J. Failure Analysis and Prevention, 2005, 5(1), pp. 13–18.CrossRefGoogle Scholar
  3. 3.
    J. Lubliner: Plasticity Theory, Macmillan Publishing Company, N.Y., 1990, p. 224.Google Scholar
  4. 4.
    N.C. Tang: “Plastic-Deformation Analysis in Tube Bending,” Int. J. Pres. Ves. Pip., 2000, 77, pp. 751–59.CrossRefGoogle Scholar
  5. 5.
    R.D. Cook and W.C. Young: Advanced Mechanics of Materials, Macmillan Publishing Company, N.Y., 1985, pp. 413–15.Google Scholar

Copyright information

© ASM International 2005

Authors and Affiliations

  • M. E. Stevenson
    • 1
  • J. L. McDougall
    • 1
  • M. E. Barkey
    • 2
  1. 1.Metals & Materials Engineers, LLCSuwanee
  2. 2.Department of Aerospace Engineering and MechanicsMetals & Materials Engineers, LLC and University of AlabamaTuscaloosa

Personalised recommendations