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Note: This discussion is about an older version of the COMSOL Multiphysics® software. The information provided may be out of date.

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combining trusses and solids

Posted 2013年10月22日 GMT-4 05:13 Version 4.3 2 Replies

Albert Geertsema
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I am struggling with combining trusses and solids in a spokes wheel. The error "The relative error is greater than the relative tolerance" still remains, allthough I tried a lot of different meshes, loads and constraints.
Can anyone solve this problem?
I attached a COMSOL 4.3 file of the spokes wheel.

Regards,
Albert

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2 Replies Last Post 2013年10月22日 GMT-4 05:53
Frank van Gool COMSOL Employee

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Posted: 1 decade ago 2013年10月22日 GMT-4 05:41
Dear Albert,

As trusses can only sustain axial forces, it is needed to enable the checkbox "geometric nonlinearity" in the study.
This will take the extra stress of the truss into account when there is a small rotation in the wheel. Thus resulting in the minimal stress state when there is no rotation.

Attached you can find the model.
Note that the "include geometric nonlinearity" checkbox can be found in step 1 under study 1.

Best regards,
Frank
Dear Albert, As trusses can only sustain axial forces, it is needed to enable the checkbox "geometric nonlinearity" in the study. This will take the extra stress of the truss into account when there is a small rotation in the wheel. Thus resulting in the minimal stress state when there is no rotation. Attached you can find the model. Note that the "include geometric nonlinearity" checkbox can be found in step 1 under study 1. Best regards, Frank
Albert Geertsema
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Posted: 1 decade ago 2013年10月22日 GMT-4 05:53
Frank,
Thanks a lot
Frank, Thanks a lot

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