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Simple plate bending 3D - local bending moment
Posted 31.08.2020, 08:04 GMT-4 Structural & Acoustics Version 5.5 3 Replies
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Hi, I have modelled a plate in 3D with a pressure load and some boundary conditions. I want to find the bending moment in the global X and Y directions. When I go to evaluate the results I find that there are 6 quanitites from which I can choose from. My question is what does the following corresponds to in terms of the global coordinate system:
Local bending moment, 11 component Local bending moment, 12 component Local bending moment, 13 component
and so on?
I have also noticed that it says local bending moment, but the unit is N, how come? As you can tell I am a beginner with using COMSOL.
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As long as you have not changed to a local coordinate system explicitly (in the Linear Elastic Material) the local directions will coincide with the global directions.
The unit for a plate bending moment is Nm/m, or equivalently N.
-------------------Henrik Sönnerlind
COMSOL
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I have not changed any coordinate system. So Local beding component 11 correspond to the bending around the X-axis or the y-axis?
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The indices correspond to the stress component that causes this moment (or other section force). Thus, Ml11 will be bending around the Y-axis, while Nl11 will be a membrane force (which is zero in a linear plate bending problem) in the X-direction.
-------------------Henrik Sönnerlind
COMSOL