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Thread: Cyclic Loading of Fastener and Fatigue

  1. #1
    Engineer
    Join Date
    Aug 2014
    Location
    Midwest, USA
    Posts
    17

    Cyclic Loading of Fastener and Fatigue

    Hi All,

    I'm trying to determine the life of the threads in a particular application, specifically, I'm trying to come up with rationale to justify ability of my design to withstand cyclic loading over the course of the product life.

    See image attached.
    Knob Problem.png

    Does anyone have any ideas how I could justify the verification of the design?
    To me it's clear it will survive the application, very little load is applied, but the designer in charge is worried about galling.

    Thanks,

  2. #2
    Project Engineer
    Join Date
    May 2015
    Posts
    125
    To you it is clear. To the designer it is not. We do not have enough information. The ones that count are those purchasing and/or using the product.

    Take the tested sample to those who issued the specification and ask for their opinion if there are doubts.

    Just my thoughts.

  3. #3
    Lead Engineer
    Join Date
    Aug 2013
    Location
    Houston TX USA
    Posts
    398
    If this becomes a major issue then there is: ASTM G98 - 17 -Standard Test Method for Galling Resistance of Materials that can be utilized but it does not apply specifically to threaded assemblies.

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