Applying the Constraints to the Solid Region

To constrain the solid region, you apply four constraints.

These constraints are:

Rigid contact constraint that models the contact between the diaphragm and the plunger.
Rigid contact constraint that models the contact between the seal and the housing.
Fixed constraint that connects the diaphragm to the housing.
Displacement constraint that models the symmetry condition.

To create the rigid contact constraint between the plunger and the diaphragm:

Right-click the Regions > Structure > Segments node and select Create Segment > Surface Segment.
Rename Surface Segment 1 to ContactPlunger.
Set Surfaces to Diaphraghm > Surfaces > Rim_Top, Top, and Top_SealImprint.

Select the Contact Plunger node and set the following properties:


Node	Property	Setting
ContactPlunger	Type	Constraint
Physics Conditions > Solid Stress Constraints	Method	Rigid Contact
Physics Conditions > Rigid Contact Obstacle	Contact Obstacle	Tessellated Geometry Parts
Physics Values > Tessellated Geometry Parts	Tessellated Geometry Parts	Plunger
Physics Values > Tessellated Geometry Parts	Rigid Motion	Translation
Physics Values > Penalty Contact Enforcement	Penalty Parameter	1.0E11 Pa/m

To create the rigid contact constraint between the seal and housing:

Right-click the Structure > Segments node and select Create Segment > Surface Segment.
Rename Surface Segment 1 to ContactSealAndHousing.
Set Surfaces to Seal > Surfaces > Bottom.

Select the ContactSealAndHousing node and set the following properties:


Node	Property	Setting
ContactSealAndHousing	Type	Constraint
Physics Conditions > Solid Stress Constraints	Method	Rigid Contact

Create a new coordinate system for the ContactSealAndHousing:

Right-click the Tools > Coordinate Systems > Laboratory > Local Coordinate Systems node and select New > Cartesian.
In the Edit dialog, set Origin to [0.0,0.0,12.5]mm,mm,mm and click Create then Close.
Rename Cartesian 1 to ContactHousing.

Select the Segments > ContactSealAndHousing > Physics Values node and set the following properties:


Node	Property	Setting
Penalty Contact Enforcement	Penalty Parameter	1.0E11 Pa/m
Rigid Contact Plane	Origin	[0.0,0.0,0.0]mm
	Normal	[0.0,0.0,1.0]
	Coordinate System	Laboratory > ContactHousing

To create the fixed constraint for the diaphragm:

Select the Segments > Fixed node and set the following properties:


Node	Property	Setting
Fixed	Type	Constraint
Physics Conditions > Solid Stress Constraints	Method	Fixed (default)

To create the displacement constraint for the symmetry plane:

Select the Symmetry node and set the following properties:


Node	Property	Setting
Symmetry	Type	Constraint
Physics Conditions > Solid Stress Constraint	Method	Displacement
Physics Values > Displacement	Method	Composite
Physics Values > Displacement > Composite	Constrain X	Deactivated
Physics Values > Displacement > Composite	Constrain Z	Deactivated