Fatigue sequential loading

Karthic_22061
Karthic_22061 Altair Community Member
edited October 2020 in Community Q&A

Hi,

I am trying to learn fatigue using optistruct , Please share me with the videos and fem files regarding fatigue. I already went through the fatigue tutorials in optistruct

 

If I put all of the fatload into one fatevnt, are they now occurring simultaneously? How do I change the model that the loads occurs one after each other?

 

Thankyou

N.K

 

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Answers

  • Rahul Rajan_21763
    Rahul Rajan_21763 New Altair Community Member
    edited June 2018

    Please make sure to use latest path of OptiStruct 2017.2.3.Please refer attached screenshot for your query. 

    <?xml version="1.0" encoding="UTF-8"?>Sequential loading.JPG

    <?xml version="1.0" encoding="UTF-8"?>FATEVNT.JPG

  • Karthic_22061
    Karthic_22061 Altair Community Member
    edited June 2018

    Hi @Rahul R,

    I tried using the SQNTL in FATEVNT load collector.

    I got error ' TID field in FATLOAD 9 must be a blank because of SQTNL  in FATEVNT 10. '

     

    Tried leaving the TID field in FATLOAD 9 blank. Resulted in some other error ' ERROR # 1000 *** in the input data:  Incorrect data in field # 3.'

     

    Please guide me how to clear the SQNTL loading errors

     

    Thank you

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited July 2018

    Hi @Karthic

     

    Can you please share the .out file?

  • Karthic_22061
    Karthic_22061 Altair Community Member
    edited November 2020
    Altair Forum User said:

    Hi @Karthic

     

    Can you please share the .out file?

    Hi @Prakash Pagadala,

    I have shared the files,

    I tried using the SQNTL in FATEVNT load collector.

    I got error ' TID field in FATLOAD 9 must be a blank because of SQTNL  in FATEVNT 10. '

     

    Tried leaving the TID field in FATLOAD 9 blank. Resulted in some other error ' ERROR # 1000 *** in the input data:  Incorrect data in field # 3.'

     

    Please guide me how to clear the SQNTL loading errors

    Unable to find an attachment - read this blog

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited November 2020

    HI @Karthic

     

     

    Can you try this file?

    Unable to find an attachment - read this blog

  • Karthic_22061
    Karthic_22061 Altair Community Member
    edited July 2018

    Hi @Prakash Pagadala

    Thankyou, its working.

    My doubt is you have left the TID fields blank for the FATLOAD card. It doesn't require the loading time history ?

     How loading time history specified in Sequential loading?

     

    <?xml version="1.0" encoding="UTF-8"?>Capture.PNG

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited July 2018

    HI @Karthic

     

    I agree. But in document it says TID should be blank,

     

    I have written to experts on this to get a clarification. I will update you soon.

  • Karthic_22061
    Karthic_22061 Altair Community Member
    edited July 2018

    Hi Prakash,

    Thankyou for writing to experts, awaiting for the experts reply:)/emoticons/default_smile.png' srcset='/emoticons/smile@2x.png 2x' title=':)' width='20' />

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited July 2018

    Hi @Karthic

     

    Right now sequential loading is not supported with tabfat.  SQTNL is used for rotor dynamic cases for example. 

     

    Concern team is going to add more information on SQTNL soon. 

     

    if at all SQTNL wants to be used, then you  would have to create separate events

  • Karthic_22061
    Karthic_22061 Altair Community Member
    edited July 2018

    Hi @Prakash Pagadala,

    Altair Forum User said:

    Hi @Karthic

     

    Right now sequential loading is not supported with tabfat.  SQTNL is used for rotor dynamic cases for example.

     

    Concern team is going to add more information on SQTNL soon.

     

    if at all SQTNL wants to be used, then you  would have to create separate events

     

    Thank you for the quick response.

    1. So you mean sequential  loading without TABFAT is OK ?

                                                          OR

    2. Creating  separate events and calling all in FATSEQ card is ok ?

     

     

     

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited July 2018

    For a static case FATSEQ is what I will try first

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