ASM Residual Stress Technical Committee

  • 1.  Residual Stress Handbook - Chapter on Failure Analysis and Residual Stress

    Posted 09-21-2021 13:23
    I forgot to cross post the message that I posted on FAS.  Here it is!  I've already had a reply, which I'm adding to the outline. 

    I am reaching out again for assistance with the chapter on failure analysis for our Residual Stress Handbook project.  This project is part of the Residual Stress Technical Committee that formed in 2020.

     Many of you have already provided guidance, and I truly appreciate the help.  I have attempted to put together an outline.  Case histories will be covered in a separate chapter.  Together, we can get a solid chapter that will advance knowledge of how residual stresses cause failures and how to detect them.

     Proposed outline:

    1.  The residual stress failure dilemma – The failure often relieves the stresses we are trying to measure
    2. Failures often attributed to residual stress
      1. Quench cracking
      2. Fastener failures
      3. Welding failures
      4. Warpage
      5. ?
    3. The relationship between residual stress and fatigue
    4. The special cases of stress corrosion cracking and hydrogen embrittlement
    5. Methods to detect residual stress and the applicability to the type of failure
    6. ?
    7. ?

    Please comment/expand/modify the above so we can cover the topic fully.  I would like to see a collaboration between FAS and RSTC.  I feel it would be a win/win for both entities.

    Thank you!
    Beth



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    Beth Snipes Chapter Council Chair 2020-2021
    Sr. Materials Engineer, FASM
    TEC Materials Testing
    Knoxville TN
    (865) 458-1991
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  • 2.  RE: Residual Stress Handbook - Chapter on Failure Analysis and Residual Stress

    Posted 09-23-2021 12:06
    We deal with residual stress in cooling of a tin alloy bonded to steel (or copper) in the production of a babbitted bearing.  We anticipate high levels of residual stress after the cooling due to the differential thermal expansion.  Under certain parameters, the residual stress is sufficient to break the iron-tin bond on cooling.  Always, the residual stress is sufficient to distort the part as the babbitt is machined to size.

    Lyle Branagan
    Engineering Manager
    Pioneer Motor Bearing Company
    Kings Mountain, NC  USA

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    Lyle Branagan
    Engineering Manager
    Pioneer Motor Bearing Company
    Kings Mountain NC
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  • 3.  RE: Residual Stress Handbook - Chapter on Failure Analysis and Residual Stress

    Posted 10-21-2021 09:36
    Lyle,

    Thank you for the comment.  I believe residual stress during manufacturing will be covered in another section.  I have added warpage/distortion to the outline.  Maybe we should have a topic on thermal effects on RS that lead to failure.

    Regards,
    Beth

    ------------------------------
    Beth Snipes Chapter Council Chair 2020-2021
    Sr. Materials Engineer, FASM
    TEC Materials Testing
    Knoxville TN
    (865) 458-1991
    ------------------------------