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DAMAGE & LIFE VALUES IN FATIGUE ANALYSIS

User: "Sivaprakash_V"
Sivaprakash_V
Altair Community Member
Updated by Sivaprakash_V

Hi Good Evening,

I am trying to perform a Fatigue Analysis for Shaft and Gear Assembly. But I got the Results of Damage as 0 and Life as 1.000E+20.
I didn't the got the expected Results. What are the Other consideration can take into account for performing Fatigue.

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    User: "Adriano_Koga"
    Adriano_Koga
    Altair Employee
    Updated by Adriano_Koga

    hi,

    unfortunately, fatigue assessment is a huge field, and there are so many effects that might come into play and affect your results that it is impossible to point all.

     

    First:

    - loading is ok? what kind of loading you have?

    - what are you comparing to? test data? real world issues? analytic solution?

    - material curve for fatigue and parameters are ok? is that SN? where does the material data come from?

    - does your model represent well the stress distribution (disregarding fatigue, for now). fatigue damage is really affected by your FE model quality, and a small error in stress might cause a huge difference in damage/life

    - what tool exactly you're using for calculating the fatigue? OptiStruct? HyperLife?

    - are you familiarized with the tool? have you run a simple known model that you can compare to analytical solutions? if yes, at least the workflow you're using should be fine

     

    In summary, there are a bunch of places to check, to make sure you will have a better representation.

     

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