The Utility browser opens. |
The model file contains 3D geometric information of the seat.
A model opens containing the geometry data. Use the Model Browser to view the model structure while providing full find, display and editing control of the entities. If the Model Browser is not already open, from the menu bar, click View > Model Browser. In seat_model.hm the solid seat geometric information is organized in a component collector called frpseat3d. |
In this step you will create automatic tetra mesh of the seat model. The Solid Meshing Wizard is used to create a solid mesh model data deck for RTM analysis starting from solids. The model file seat_model.hm contains 3D geometric information of the seat.
Solid Meshing Wizard
seat3d component selected for tetra mesh
A dialog opens. Input mesh data
The meshed seat model is generated and organized in a new component collector called seat3d_tetmesh1.
Mesh seat model |
In this step you will select materials for the model and assign them to the appropriate components.
A dialog opens.
The material appears in the Selected materials. Material assignment 5. Right-click Default_Preform and select Assign Material. A table opens in the Material Database Editor.
Assign material to component 6. Activate the seat3d_tetmesh1 checkbox to apply Default_Preform material. 7. Click Update. The material shows a tree view in the Selected materials list. When the material item is expanded, the components that use the material are listed. |
In this step you will create boundary conditions on the seat model. The boundary condition in RTM has two entities; a load collector card image that defines the boundary and a component collector to store the boundary faces. The Boundary Condition Editor is used to create boundary conditions on faces. In the seat model there are specific boundary conditions that need to be specified.
RTM simulation boundary conditions
A dialog opens.
Data fields appear in the dialog. 3. To create inlet boundary conditions:
Inlet boundary condition
Element selection for inlet BC face creation 4. To create outlet boundary conditions:
Vent boundary conditions
5. To create wall boundary conditions:
Wall boundary condition
Note: Before proceeding to the next step, run a check for undefined and duplicate BCs.
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In this step you will setup process parameters. The process parameters allow you to control the run by specifying the equations/physics to be solved and defining control parameters, such as convergence tolerance and number of iterations/time steps.
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In this step you will load the OptiStruct user profile. Draping analysis is performed in OptiStruct. Resin transfer molding consists of mainly two process draping analysis and RTM simulation.
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Midsurfaces can be extracted for sheet metal stampings, molded plastic parts with ribs, and other parts that have a thickness smaller than width and length. During midsurface extraction, the original geometry that you select to extract the midsurface from remains unchanged, and the new geometry that represents the midsurface is created. The (variable) thickness of each middle surface is calculated and stored with the surface definition. You can either create the midsurface from the seat model or you can import it.
A midsurface representation of a solid part of solid geometry is generated and organized in a new component collector called Middle Surface.
Extracted midsurface
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In this step, you will set the mesh parameters and create CQUAD4 mesh on the midsurface created in the previous step. Note: The RTM solver supports only quad mesh for the draping operation.
Note: The seat2d component collector is now the current component collector, and any component created will be placed in this collector.
HyperMesh opens the density subpanel in the meshing module. The model displays a node seeding and a number on each surface edge. The number displayed in the graphics area is the number of elements that were created along the edge.
Meshed component |
Use the Systems panel to create a rectangular coordinate system.
System creation |
In this step you will generate two plies of unit thickness.
In the Model Browser, a new ply and an element set that consists of all the elements selected to define the shape of the ply will be added.
The Entity Editor opens and displays the component’s corresponding data. You can change this data, if needed.
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In this step you will perform drape calculation. The preform is characterized in the lay-flat orientation. This characterization can be done in either of the following coordinate-systems: oblique, cylindrical, spherical. For the seat model, permeability is known in the Cartesian system. To produce a part of the desired shape, the unsaturated preform is draped on the mold before the resin infusion. To accurately perform the RTM simulation, you need to determine the permeability of the preform in the global coordinate system by taking into account the effect of the mold geometry.
Once the Drape Estimator has finished generating the drape data, HyperMesh creates a drape table for each selected ply inside the Tables folder in the Model Browser.
Review drape table |
In this step you will create a laminate.
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In this step you will export the RTM data deck.
6. Click Export. |
In this step you will perform RTM simulation.
With a successful launch of the run, you can monitor the status of the simulation. |