Week 4-1D Element Creation Challenge

Aim:

To create mid surface , mesh and 1D element as given components.

Given data:

Given CAD:

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 x and 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

d. & e. Apply the mass of magnitude 10 with the RBE2 link

f. Join the two components with Spring elements

Procedure:

¬ First import CAD file into the Hypermesh and give autoclean up.

¬ Then go to extraact mid surface geometry - midsurface - auto extraction then midsurface created.

¬Now rename the mid surface pshell as part1.

¬ Then extract another part rename mid surface pshell as part 2.

¬ Now going to mesh the components using automesh.

¬Go to 2D - automesh - element size 5 and select all surface using displayed option.

¬ Before mesh using washer split option to create circle as 5mm in the hole.

¬ Now meshed the components as element size as 5.

¬ Clear the tria in the hole area using nodes increase or decrease option used.

¬Then now going to create 1D element.

¬ now going to use rigid option to RBE2 the first holes.

¬ Other two holes are RBE3 links to connect.

¬ After completing the RBE2 and RBE3 links going to create cross section of the beams, rods and bar.

¬That go to 1D - Hyperbeam - standard section in library - section type -thinwalled box.

¬ Then create I - section beam using the below method.

¬ As well the last X-section beam.

¬ To create the link for rod, beam and bar.

¬ go to 1D bars, rods and select the respective element and its properties

¬ Then fix the spring in ' f ' portion in given cad

¬ go to 1D -spring - select nodeA and node B .

¬Finally enable the crossectional view .

¬ go to menu bar and slect the 1 detailed element representation.

Final model:

Conclusion:

¬ In this challenge i learned extract mid surface , create properties and meshed the components.

¬ Then learn the RBE2 , RBE3, spring are learned.

¬ Learn the cross sectional beam,rods and bar .

¬Mass apllied to RBE2 .