Week 4-1D Element Creation Challenge

Assignment:3

Objectives: Mesh the Given component with the Size of 5 Units. Create 1D elements on the following component with given cross-section and DOF

1.Rod element: - Translational DOF should be Constrained with RBE2 link

Cross-Section: BOX- Dimension a= 12 mm

                              dimension b=10 mm

                              Thickness t= 0.75 mm

2.Beam element: - All DOF should be constrained with RBE3 link

Cross-Section: I Section- Dimension a= 8 mm

                                     Dimension b= 10 mm

                                     Dimension c= 8.5 mm

                                     Thickness t1= 0.75 mm

                                     Thickness t2= .6 mm

                                     Thickness t3= .6 mm

3.Bar element: - Constrain only xand y DOFs With RBE3 link

Cross-section: X section- Dimension DIM1= 5 mm

                                             Thickness DIM2= 1.2 mm

                                             Dimension DIM3= 10 mm

                                             Thickness DIM4= 1.2mm

4. At d & e. Apply the massof magnitude 10 with the RBE2 link

5. Join the two components with Spring elements

Approach:

• Import the IGES CAD model into HM.

• Delete the unwanted line elements.
• Generate the Mid-Surface using auto-mi surface with Extraction option ‘’Offset’’ to capture the internal bends in the bracket along with proper surface splits.
• Create washer splits of standard 2.5 times the hole diameter using surface split subpanel.

• Create material property as per requirement
• Using 2-D panel, generate mesh using mixed elements with 5 units as element size using ‘’auto-mesh’’ subpanel.
• Tweak the number of nodes near the bends to have a better-quality mesh.
• Create properties card for the brackets and associate them with respective component.
• Create RBE-2 elements at location ‘’a’’ using 1-D elements panel

 Procedure for Creating 1-D Elements

• Using 1-D elements panel, click on Hyberbeam option
• Create different types of beam sections as per the specification

• Create property card for the beams and associate them with proper beam collectors.
• Create mass element at location d & e and using a spring element connect the two components together

RESULT: Final model is prepared according to the specifications with appropriate 1D elements. 

Key taleaway about Rigid elements: 

A rigid element is a link from one node to one or more other nodes, where the motion of the node(s) is governed by the "degrees of freedom" you choose to connect.