Deploying 1D elements on the given component and assigning cross-sections & properties to them.

Objective: To create 1D elements on the given model with given cross-sections and DOF.

CAD model images:

Imported geometry model

Procedure:

• First, import the given model into Hypermesh using import geometry feature.
• After importing the geometry, create midsurface on both the brackets using the “midsurface” option in the geometry tab as shown in the below image. Rename them in the entities tab & give desired colors to them.

• Create one separate component because the two midsurfaces created will be shown as single component in the entities tab which creates problem in meshing.
• Now move the separately created midsurface to the new component by using “organize” feature in the tool tab. After moving it, delete that midsurface.
• Using the “delete” option delete the solids present in the model & make sure only midsurfaces are present.
• At this stage create washer splits around all the holes and mesh the component.
• Meshing is basically done using the automesh option in the 2D tab section.

• After meshing the component, create 3 separate properties for rod, beam, bar elements. In the Hyperbeam window create 3 different cross sections for those elements according to the given dimensions using Hyperbeam option in the 1D tools tab.

Rod cross-section Beam cross-section

Bar cross-section

• Create RBE2 & RBE3 links at respective places using “rigids” option in the 1D tools tab.

RBE2 link RBE3 link

• At region “a” in the given figure, create an RBE2 link with only translational DOF. Now create a “rod” element connecting them using the rod option in the 1D tools tab.
• At region “b” in the given figure, create an RBE3 link with all DOF. Now create a “beam” element connecting them using the bar option & selecting the element type as “CBEAM”.
• At region “c” in the given figure, create an RBE3 link with only x and y DOFs. Now create a “bar” element connecting them using the bar option & selecting the element type as “CBAR”.
• At regions “d” & “e” create RBE2 links and apply the mass of magnitude 10 using “masses” option in the 1D tools tab.
• Connect “d” & “e” regions using spring element by clicking on “springs” tab in the 1D tools tab & select the element type as “CELAS1”.
• Now update the “card image” and “beamsec” for each created property in the entities tab to the left & also update the elements respectively.

• In order to view the elements with their respective cross-sectional areas, click on the drop-down menu of the “1D Traditional Element Representation” icon & change it to “1D Detailed Element Representation” in the tool menu bar.

Results:

Final model images

View 1 showing spring, rod, beam, bar elements

View 2 showing different cross-sections from top.

View 3 showing final image