Week 4-1D Element Creation Challenge

AIM:

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

A. 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

B. 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

C. 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= 1.2m

D & E. Apply the massof magnitude 10 with the RBE2 linK.

F. Join the two components with Spring elements

PROCEDURE:

• Import the given model by using Import geometry option

• Extract the midsurface for the given model
• Goto Geometry > midsurface
• Since the model is of uniform thickness, autoextraction is preferred
• Select the whole model and extract the mid

• since both the mid are generated in a single component
• we can seperate to two components, by creating a new component and move the mid
• For moving the midsurface to different component Goto Tool > Organise > move

• Assign the material for the component as steel in the model browser.

• Similalry assign properties for the components in the model browser
• Give card id as PSHELL , select the material as steel and provide thickness value

• Give washer splits fort the holes,Goto Geometry > Quickedit > Washer split
• provide offset value as 5mm and select the holes

• Mesh the mid ,Goto 2D > AUTOMESH , give target element size as 5mm
• Adjust the nodes by matching the numbers after meshing

• Hide the surafaces of the component ,Goto model browser > components

• Connections:
• For holes we use RBE2 and RBE3 elements in 1D module
• For creating RBE 2 elements ,Goto 1D module > Rigids > Elemnt type RBE2

• After meshing Create 1D elements such as Bar ,Rod and Beam
• For Bar and Beam select element type CBAR and CBEAM respectively
• For Rods element type is CROD and select the nodes

• Create cross sections for Bar ,Rod and Beam
• For creating cross sections goto hyper beams > create
• For rod:
• Cross-Section: BOX - Dimension a= 12 mm

  Dimension b=10 mm

  Thickness t= 0.75 mm

• For beam:

• 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

• For Bar:

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

  Thickness DIM2= 1.2 mm

  Dimension DIM3= 10 mm

  Thickness DIM4= 1.2mm

• Create new properties for the sections
• Use PROD, PBEAM, PBAR as property ID for Rod ,Beam and Bar respectively

• After creating properties, Update the 1D elements by selecting the property and matching them
• Mass is applied with the magnitude of 10 in RBE2 links
• spring elements are created as shown below

• Finally, Change from traditional 1D element representation to 1D detailed element represnetation

CONCLUSION:

• Mid-surface is taken for the given model , assigned material property and created new properties for the component.
• Provided washer splits to the holes and Meshed the mid with the given target element size
• The Holes has been connected with RBE2 & RBE3 elements.
• Created 1D elements like Rod,Bar,Beam and created cross section for them .
• Created new properties for the cross sections and updated the property with 1D elements
• The mass has been applied with the magnitude of 10 on RBE2 links
• The spring elements are created to join the two components