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Fatigue sequential loading

Karthic_22061

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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Rahul Rajan_21763

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"?>

Karthic_22061

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

Hi @Karthic

Can you please share the .out file?

Karthic_22061

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

HI @Karthic

Can you try this file?

Unable to find an attachment - read this blog

Karthic_22061

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"?>

Altair Forum User

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

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

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

Hi @Prakash Pagadala,

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 ?

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

Altair Forum User

For a static case FATSEQ is what I will try first