contact problem
Hi ...
I have a model which is shown in the picture attached.
I have defined the contacts properly for the bodies.(PCONT mu0.3)
But what i observed is the plate is very slightly sticked(or bonded ) to the body 2 .
Even the deformations in the plate alone are very small ...i woner why it is deforming at all.
I tried with 3d elements also ...but the observation is same .
please find the pics and model file for reference .
Please help me. This is very crucial for me .
<?xml version="1.0" encoding="UTF-8"?>
<?xml version="1.0" encoding="UTF-8"?>
<?xml version="1.0" encoding="UTF-8"?>
<?xml version="1.0" encoding="UTF-8"?>
Answers
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Hi
to avoid this i want to make opengap stiffness(Kb) as too small . How can i do that .
Does changing the Kb value effects the overall results (stresses or displacements) ? apart from convergence difficulties.
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Altair Forum User said:
Hi ...
I have a model which is shown in the picture attached.
I have defined the contacts properly for the bodies.(PCONT mu0.3)
But what i observed is the plate is very slightly sticked(or bonded ) to the body 2 .
Even the deformations in the plate alone are very small ...i woner why it is deforming at all.
I tried with 3d elements also ...but the observation is same .
please find the pics and model file for reference .
Please help me. This is very crucial for me .
<?xml version="1.0" encoding="UTF-8"?>
<?xml version="1.0" encoding="UTF-8"?>
<?xml version="1.0" encoding="UTF-8"?>
<?xml version="1.0" encoding="UTF-8"?>
Could you also attach .out file to take a quick look for the outcome of nonlinear run?
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Can you also give a try with PARAM LGDISP1 and refer information related to follower force. The file which you shared has Pressure load acting on upper side.
<?xml version="1.0" encoding="UTF-8"?>
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sorry sir i gave lot of trials . So files are all mixed up.
I will give a try with LRGdisp
PFA
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Sir
I tried with LGDISP but the the out come is same .
The solution is not fully completed, I loaded nlh3d file and observed the same behaviour as earlier(small displacement problem)
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any update?
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if any body have an idea ..suggest me
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please share with me if any document regarding how to asses contact results( to check if the contact working properly or not ? by checking contact pressure , contact forces )
and how to deal with sudden stress rises at the contact edges(contact sharp edges).
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Yes, you need to work on contact.I would suggest you to refer below examples of OptiStruct Example guide.
Nonlinear Large Displacement Quasi-static Analysis
OS-E: 0115 Finite Sliding Contact
OS-E: 0155 Snap-Fit Analysis (CONSLI vs FINITE)
OS-E: 0160 Nonlinear Static Analysis of Snap Fit Assembly Using Continuous Sliding
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<?xml version="1.0" encoding="UTF-8"?>
Sir i can define the contacts..My problem is i am getting deformations where i should not supposed to get .(getting deformations where the gap is not at all closed.)
I wanted to know why it is happening and how to avoid this .
I also attached model files earlier.
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