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Thermal stress modeling - problems with boundary conditions
Posted 2012/01/03 9:16 GMT-5 Structural Mechanics Version 4.2a 0 Replies
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I'm trying to solve a problem of modeling of thermal stresses in layer compost materials. I need it for my master's diploma.
I attached a file that describes the heating conditions of my composite. So as you see my task is a simple 2d task.
When I set boundary conditions for Solid Mechanics I set point "A" as a "Fixed Constraint" and point "B" as a "Prescribed displacement" in y direction = 0.
The material properties I set from the Comsol library.
When I begin solving I face with the error:
Undefined value found.
" - Detail: Undefined value found in the equation residual vector.
.There are 569 degrees of freedom giving NaN/Inf in the vector for the variable mod1.u
. at coordinates: (-0.85,-0.35), (-0.85,-0.296429), (-0.85,-0.242857), (-0.814082,-0.260358), (-0.778163,-0.27786), ...
There are 569 degrees of freedom giving NaN/Inf in the vector for the variable mod1.v
. at coordinates: (-0.85,-0.35), (-0.85,-0.296429), (-0.85,-0.242857), (-0.814082,-0.260358), (-0.778163,-0.27786), ..."
But if I change the coefficient of thermal expansion, if I put a constant value for it, instead of one that Comsol offers for both materials, everything solves ok. But the results seem to be very far from the reality.
So please help me with this problem.
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Hello Mikhail Trunov
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