Home / Examples / Coupled Analysis / Electric-Stress Analysis [Coulomb/Galileo] / Example 1: Displacement Caused by Electrostatic Force

Example 1: Displacement Caused by Electrostatic Force

General

The model is a parallel-plate capacitor. Applied electric potential generates
electrostatic force between the electrodes, resulting in displacement.
The deformation, the displacement distribution, and the stress distribution are solved.
Unless specified in the list below, the default conditions will be applied.

Results will vary depending on Femtet version and the PC environment.

Analysis Space

Item	Settings
Analysis Space	3D
Model Unit	mm

Analysis Conditions

On the multiphysics setup, select "Electrostatic force to be taken into account".

Item	Settings
Solver	Electric Analysis [Coulomb] Stress Analysis [Galileo]
Analysis Type	Static Analysis
Multiphysics Setup	Electrostatic force to be taken into account
Options	N/A

Ambient air is not required. Deselect the automatic creation.

Tab	Setting Item	Settings
Mesh Tab	Ambient Air Creation	Create ambient air automatically: Deselect

Model

Body Attributes and Materials

Body Number/Type	Body Attribute Name	Material Name
0/Solid	PLATE	001_Alumina *

* Available from the material DB

Boundary Conditions

Boundary Condition Name/Topology	Tab	Boundary Condition Type	Settings
E2/Face	Electric	Electric Wall	Electric Potential Specified 1000 [V]
E1/Face	Electric	Electric Wall	Electric Potential Specified 0 [V]

Results

The electric potential distribution solved by Coulomb is shown below in the isosurface contour diagram.

The vectors of displacement caused by the electrostatic force are shown below.

The electrodes are attracted to each other due to the electrostatic force, generating a tensile force. The tensile force will generate the displacement in the spreading direction.

The magnitude is quite small.