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Double loading

Question asked by 1-1KYWMD on Mar 19, 2009
Latest reply on Mar 20, 2009 by 1-1KYWMD

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When I check the Result Force for an entire model of a static stress analysis I am getting double the resultant than the input. I am just putting a single face force in the Z direction. Eg 100 pound force on a single face. When I look at the Reaction force for the entire model it says 200 lbs. What might be the issue, or what am I not understanding? I am not using gravity. I did a small test case it works as I expected, it is just this model that is giving me the issue.
Thanks
Bruce

1-1KYWMD Mar 20, 2009 10:29 PM

Correct Answer

Thank you thank you thank you.
I upgraded to Sp2.1 and the reactions now balance the forces perfect- nasty bug there!
Bruce

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1-DEXHLY Mar 19, 2009 5:54 PM

Can you upload the file so I can check?

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1-DEXHLY Mar 20, 2009 5:13 PM

Bruce this may be the problem.
When you specify the force magnitude you have two options, PER ITEM or TOTAL. If on the edge you have specified you have to arrows stating the load you are going to apply on your model be sure to select TOTAL otherwise you will have x2,x3,...,xN times the load you want to apply
Hope is clear

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1-1KYWMD @ 1-DEXHLY on Mar 20, 2009 5:20 PM

Thanks - that was the first thing I looked at as in prior versions of Designstar I did not have the "total" option. I tried both ways total and per item but get the same result (it is only one face or edge I am applying the force to while I am trying to solve this issue).

What is different for me in this study is that it is surfaces with shell mesh - I have mostly worked in solids before. Is there anything around that I may not be understanding? I Think I will recreate the study from scratch and see if it's a bug.
I am unable to send the model because of confidentiality, but otherwise would.
Bruce

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1-DEXHLY Mar 20, 2009 5:27 PM

Try to apply a force on a single edge and check Total as option and see your RF. Weird but if I cannot see what you did I cannot really help you.
Good luck!!

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1-YJ1IM Mar 20, 2009 5:32 PM

There was a bug with pressures on surfaces with shell mesh doubling the load. This was fixed in 2009 Sp2.1. Did not test if force was doing the same thing.

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1-1KYWMD @ 1-YJ1IM on Mar 20, 2009 10:29 PM

Thank you thank you thank you.
I upgraded to Sp2.1 and the reactions now balance the forces perfect- nasty bug there!
Bruce

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6 Replies

1-DEXHLY Mar 19, 2009 5:54 PM
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Can you upload the file so I can check?
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1-DEXHLY Mar 20, 2009 5:13 PM
Mark Correct
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Bruce this may be the problem.
When you specify the force magnitude you have two options, PER ITEM or TOTAL. If on the edge you have specified you have to arrows stating the load you are going to apply on your model be sure to select TOTAL otherwise you will have x2,x3,...,xN times the load you want to apply
Hope is clear
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- 1-1KYWMD @ 1-DEXHLY on Mar 20, 2009 5:20 PM
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  Correct Answer
  Thanks - that was the first thing I looked at as in prior versions of Designstar I did not have the "total" option. I tried both ways total and per item but get the same result (it is only one face or edge I am applying the force to while I am trying to solve this issue).
  
  What is different for me in this study is that it is surfaces with shell mesh - I have mostly worked in solids before. Is there anything around that I may not be understanding? I Think I will recreate the study from scratch and see if it's a bug.
  I am unable to send the model because of confidentiality, but otherwise would.
  Bruce
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1-DEXHLY Mar 20, 2009 5:27 PM
Mark Correct
Correct Answer
Try to apply a force on a single edge and check Total as option and see your RF. Weird but if I cannot see what you did I cannot really help you.
Good luck!!
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1-YJ1IM Mar 20, 2009 5:32 PM
Mark Correct
Correct Answer
There was a bug with pressures on surfaces with shell mesh doubling the load. This was fixed in 2009 Sp2.1. Did not test if force was doing the same thing.
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- 1-1KYWMD @ 1-YJ1IM on Mar 20, 2009 10:29 PM
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  Correct Answer
  Thank you thank you thank you.
  I upgraded to Sp2.1 and the reactions now balance the forces perfect- nasty bug there!
  Bruce
  Like • Show 0 Likes0
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