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Help to describe the equations
Posted 2 apr 2019, 02:47 GMT-4 General, Materials, Studies & Solvers Version 5.4 1 Reply
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Can anyone help with a detailed description of attached below equations (Solid Mechanics and Linear Elastic Material), because Comsol's help is not very useful.
I will be glad to any links with help or your expirience and advices. Thanks!
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Hi,
The equations shown in the Equation section of the settings for a physics feature is only intended as an indication of the type of its contribuitons. They are not inteded as a complete theory. As an example, notation is not introduced.
To get the in-depth theory, you should read the Structural Mechanics Theory chapter in the Structural Mechanics Module User's Guide.
This said, the first equation represents the equation of motion (density*acceleration = gradient of 1st Piola-Kirchhoff stress + volume forces).
The second eqution is the computation of elastic stresses, under the assumption of geometric nonlinearity.
You can also find related information on
https://www.comsol.com/multiphysics/stress-and-equations-of-motion
https://www.comsol.com/multiphysics/analysis-of-deformation
Regards,
Henrik
Henrik Sönnerlind
COMSOL