Henrik Sönnerlind
COMSOL Employee
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Posted:
6 years ago
2019年4月2日 GMT-4 07:50
Updated:
6 years ago
2019年4月2日 GMT-4 07:50
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
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
Regards,
Henrik