Assignment 2-RADIOSS Engine File Editing & 3D Meshing Challenge

OBJECTIVE

1. Check the material properties of the rail component and calculate the speed of sound in steel rail:

ANS

 

  

Image shows the .0000rad intial file

 

 

• From the given starter file E=210000, ρ=0.0078:
• Speed of the sound c= √ (E/ ρ)
• By substituting we get c= √(210000/0.0078) =5188.75mm/ms

 

2. The length of the rail is about 1000 mm.calculate the time takes for a shock wave to travel from one end of the rail to the other.

Ans :       

• Given L=1000mm
• Time taken (dT)=    length /sound speed
• dT=(1000/5188.75)= 192724645 ms

 

3.Time for sound to travel length of rail=______

       Ans : 

            time taken to travel the total length of the rail is (dT =0.192724645 ms)

                    

4.Edit the engine file so that the stress wave can be monitored, moving from one end of the rail to the other during impact -this will require a termination time equal to the time it takes for the sound to travel the length of the rail(set on/RUN card)

5.Set the frequency of animation output to a time that will give 20 animation steps(/ANIM/DT)

Ans :

• T freq= dT/(number of animation steps)
• T freq=192724645/20=0.00963623225

6.Change /print -10.

• N­- PRINT = 10

Before edit

After edit

 

7.

3d meshing tetra mesh and hex mesh

• Repeat class examples and, maintain the quality.
• Target tet size=5mm,hex size=10mm,tet collapse=0.15.

Procedure

Import :the model is imported into the graphical area

Import image

Measure :the thickness of the component is measured at the different point if the thickness is found above 6mm 3d mesh is to selected

3d meshing : it is the meshing done on the component without taking any mid surface the mesh is developed

• view>browsers>hypermesh>utility>quickmesh>tetra mesh>component>select

the component>enter the size=5>mesh>ok

 

Image shows Quick tetra mesh tab

Image shows the tetramesh image included tet collapse elements

• quality criteria for the 3d elements are checked
• tet collapse is checked

(tools>check elements>3d>tet collapse>check elements)

• the tet collapse elements are sorted by remeshing the tet elements
• (tetcollapse elements>savefailed>mask>elements>retrive>mask>reverse>ok)
• 

Image shows the individual tet collapse elements

• (3d>tetramesh>remesh>edit the tetra mesh parameters>remesh>ok)

 

Image shows the tetra mesh image after sorting the tet collapse

 

Image of hub after tetra mesh

HEXA MESHING

IMPORT : import the arm bracket model into the graphical area

Procedure:

• Check for the geometrical errors and open edges in the model
• Meshing

(select the arm base surface>2d>mesh>quads>element size = 10>ok)

 

Image show the 2d mesh on the arm base

• 3d mesh

Element offset

3d>element offset>select the elements>select the destination surface>select the layers based on the thickness>select the line as along surface>drag)

 

3d mesh on the arm base

2 spin

 

• As the geometry is in circular the meshing is done by using spinning the elements
• Create the center for the curvature as arefrence point
• (tools >measure>select the 3nodes on the line>ok)
• 3d>spin>select the elements>angle 90>base point circle center >select the layers as 25>drag)

Before spinning the elements

 

3d mesh image after application of 3d spin tool

3.linear solid

Here, the elements are mapped from the surface to the destination

• Create the mesh at the end of the surface which should be equal in number to the reference elements from the surface
• 3d>linear solid>select the refrence elements>select the destination elements>number of layers 12>ok

 

Before applying linear solid

 Image after linear solid (mesh mapping)

3. Solid map(general)

• Create the mesh on the circular part of the cylinder
• 3d>solidmap>select the source elements >select the destination surface>number of layers >select the mixed option from>select the reference line >select the node path to be followed by the elements>ok)
• The elements are found for any open edges and elements are equiavalenced
• (tools>edges>select the elements>preview equivalence >ok
• 

Image showing the reference points for the mesh path

Image after applying the solid mesh

Delete for the faces

Here, the 2d faces created while meshing are deleted

( tool>face>find faces>select the faces and delete the faces)

Overall image after hexa meshing

Outcomes:

• Learnt how to mesh component using the quicktetra mesh tab
• Learnt how to mesh the model using the hexa mesh