FATLOAD with LCID entry

Altair Forum User
Altair Forum User
Altair Employee
edited October 2020 in Community Q&A

Hello,

 

for a Fatigue Analysis I am using the LCID entry to refer to a transient reponse load case to evaluate stress history.

 

My question in which manner the stress history is processed. If the Fatigue LC reads stress from h3d-file the output frequency for transient response analysis is very important.

 

Thanks for your comments.

 

JD

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Answers

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited August 2018

    Hi,

     

    It is same as loading frequency

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited August 2018

    Hi Prakash,

     

    the loading frequency is not given since the transient response analysis is based an random displacement data via TABLED1 in a TLOAD1 entry.

    So frequency of stress history output is defined via TSTEP Load Collector, but in TSTEP there is one Entry for Time Increment and One for Output in h3d.

     

    So if fatigue analysis would be calculated parallel the frequency for Time Increment could be used. Is that the case?

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited August 2018

    Hi,

     

    Sorry for the confusion, I meant to say that Fatigue subcase considers the N on Tstep. For example, if N= 20, Fatigue subcase automatically considers outputs of all 20 and there is no way to filter for peaks or lows. 

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited August 2018

    Thanks @Prakash Pagadala that was very helpful

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