ERROR 153 Exactly zero pivoting encountered during Numerical Factorization
Altair EmployeeMy error is :
*** ERROR # 153 ***
Exactly zero pivoting encountered during Numerical Factorization;
the model may have rigid body mode.
Solver error no. = -503
spc set id = 3
index = 1
Possible reasons are:
1) insufficiently constrained model,
2) having rigid body mechanisms within the model,
3) extremely ill-conditioned rigid element sets,
4) extremely thin shells (as used for skinning) that have MID2/MID3,
5) gap elements with extremely high stiffness (KA, especially KT or MU).
Check the model and rerun the problem.
(MECHCHECK may be used to find the rigid body modes. To do so,
change the input to be an eigenvalue analysis and add MECHCHECK.)
(WARNING: results obtained with MECHCHECK cannot be used because
the model is changed internally.)
This error was detected in subroutine bcsmtxfct.
At this case, I want to simulate the two beams with ball and revolute joints in gravity condition.
I use the revolute joint and ball joints at two beams .
and I set the gravity at the model with no constrain condition (I use the Control Cards = PARAM INREL=-2).
This is my joint set, I also want to ask what is different at FE & MBD.
<?xml version="1.0" encoding="UTF-8"?>
This is my model.
Really thanks!
Answers
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If I only use one part to try
the error is same
I also use the non-linear quasi-static
it's ok but at the result it can't have motion
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Altair Forum User said:
no constrain condition (I use the Control Cards = PARAM INREL=-2).
At before article, I have seen you have the same problem
Do you know what is my problem?
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HI,
I will check and update you soon.
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Hi @LKZ
Can you create rigids by selecting few nodes of solid elements and check if that helps?
<?xml version="1.0" encoding="UTF-8"?>
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@Prakash Pagadala Really thanks to your apply.
You help me a lot.
Now I use your method to run the analysis, but the result it doesn't have motion.
Does I set the wrong revolute joint?
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Hi @LKZ
Sorry for a late reply.
Looks like the applied load is very small. I can see the displacement which is very less (XXe-9) on HyperView.
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I want to ask you if I want to set the part to be rigid
Did this set is correct? Because I use this set the model have no result.
My step is to set>SET_ELE>choose will be the rigid's elements>Create>rigid body>Element Sets>choose the set.
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HI
Yes LKZ you can also use RBE2 to set them as rigid.
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