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About linear buckling mode.
Posted 17 feb 2011, 06:43 GMT-5 MEMS & Nanotechnology, MEMS & Piezoelectric Devices, Structural Mechanics Version 4.1 1 Reply
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I'm wondering whether 'Linear Buckling' is working correctly.
In 2D, for example,
rectangle(GaAs) 23um X 0.1um with fixed two boundaries(0.1um) is placed.
And I gave +-400000000N/m as an compressive force per length to the fixed boundaries.
Also, perturbation is included.
I think compressive force per length is sufficiently large to make buckling mode.
However, It does gives a lot of warning and defected result, regardless of mode n=1,2,3.....
Not to speak of complex 2D model or 3D one.
I think that sine-shape result must be given.
What is the problem? Is there any program defect about Linear Buckling in COMSOL?
Thank you.
Hello Byeong Gyun Oh
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I am not sure if this answer is still needed, but there is a basic problem here. If my understanding is correct, you are applying stress on a fixed support. This is incorrect, since since you cannot have both on the same boundary. Instead, try to impose an internal body stress of the same amount. I would first try to do a static calculation with no buckling analysis with very low stress, just to see if the model is correct. Then after that, do the buckling.
doni