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Lateral loading of a beam after buckling due to intrinsic stress
Posted Apr 24, 2015, 4:37 p.m. EDT Structural Mechanics Version 5.0 1 Reply
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I am beginner/novice COMSOL 5.0 user trying to simulate the lateral loading of a fixed-fixed flat silicon beam AFTER it has buckled due to known intrinsic stress (i.e. I want to push down on the "lump" created after buckling). I am able to create the structure and generate the buckling eigenmodes. Of course, being an eigenmode problem, the mode amplitudes are ambiguous but what I would like to do is the following:
1. Estimate the amplitude using energy/arc length considerations
2. Use the mode shape and amplitude as a pre-stressed displacement field of a new structure
3. Model lateral loading of the new structure as similarly outlined in
www.comsol.com/model/download/198735/models.sme.postbuckling_shell.pdf
Firstly, I am wondering if this is even a valid procedure. Secondly, is there canonical method to estimating the buckling mode amplitude? Lastly, how would one export the mode shape to create a new pre-stressed structure? Not sure it will help, but I've attached my .mph file.
1. Estimate the amplitude using energy/arc length considerations
2. Use the mode shape and amplitude as a pre-stressed displacement field of a new structure
3. Model lateral loading of the new structure as similarly outlined in
www.comsol.com/model/download/198735/models.sme.postbuckling_shell.pdf
Firstly, I am wondering if this is even a valid procedure. Secondly, is there canonical method to estimating the buckling mode amplitude? Lastly, how would one export the mode shape to create a new pre-stressed structure? Not sure it will help, but I've attached my .mph file.
Attachments:
1 Reply Last Post May 6, 2015, 1:31 p.m. EDT
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Posted:
10 years ago
MIT released some MATLAB code last year (May 2014) for post-bifurcation analysis via LiveLink; essentially following the procedure as outlined in the original post. The code and documentation may be found at
dspace.mit.edu/handle/1721.1/86934
I will try this out and provide feed back and perhaps a more comprehensive procedure later for those of you with similar questions.
dspace.mit.edu/handle/1721.1/86934
I will try this out and provide feed back and perhaps a more comprehensive procedure later for those of you with similar questions.