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# Example7Electrostatic Forces Applied on Dielectric Material

General

• In this exercise, an alumina block is inserted in the parallel plates which have the potential difference.

• The electrostatic forces applied on the alumina block and the electric field are solved.

• Unless specified in the list below, the default conditions will be applied.

### Analysis Space

 Item Settings Analysis Space 3D Model unit mm

### Analysis Conditions

Select “Static analysis” as the potential is static.

 Item Settings Solver Electric Field Analysis [Coulomb] Analysis Type Static analysis Material Type Dielectric material Options N/A

In actuality, the electric field exists outside the analysis domain. Therefore the open boundary condition below is applied initially.

 Tabs Setting Item Settings Open Boundary Tab Type Absorbing boundary Order of Absorbing Boundary 1st degree

### Model

Create 2 sheet bodies for electrodes. Then, specify the voltage on each as boundary condition.

Finally, create a box solid body for the alumina block.

### Body Attributes and Materials

Two sheet bodies are used to imprint the voltage-specified boundary condition.

They are called “imprinting body”.

You don’t need to set the body attribute or the material property on them.

 Body Number/Type Body Attribute Name Material Name 1/Sheet Imprinting body 2/Sheet Imprinting body 3/Solid Block 001_Alumina *

* Available from the Material DB

### Boundary Conditions

 Boundary Condition Name/Topology Tab Boundary Condition Type Settings Electrode1/Face Electric Electric wall Voltage specified, +1[V] Electrode2/Face Electric Electric wall Voltage specified, -1[V] Outer Boundary Condition * Electric Open boundary

To set Outer Boundary Condition, go to the [Model] tab

and click [Outer Boundary Condition] .

### Results

To see the electrostatic force applied on the alumina block, go to the [Results] tab

click [Table] .

You can observe the alumina block is pulled toward the electrodes.

The vectors of the electrostatic force are shown below.

The vectors of the electric field are shown below.

The electric field is concentrated in between the alumina block and the electrodes.

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