Challenge

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

RRajath Acharya13 Feb 2022

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

Import the given Radioss file into the GUI, File>import solver deck> Select file type> Import

Now to check for the material property of the given component, to calculate the speed of the sound in steel

Material is steel:

Given:

E: 210000.00 MPA

Nu: 0.29

Rho:0.0078 kkg/l

Formula :- C= Sqrt(E/ρ)

= sqrt(210000/0.0078)

= sqrt(2,69,23,076.923)

The speed of sound in steel rail (C) =5,188.75 m/s

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.

Given:-

l=1000mm

Formula:- T=l/c

=1000/5188.75

Time taken T =0.1927s

3.Time Taken for sound to travel length of rail T =0.1927s

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)

Expand Cards From Model browse> ENG_Run.

Editing the Tstop or termination time is equal to time taken for the sound to travel the length of the rail.

Tstop=T=0.1927

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

Animation steps= 20

Formula: Tfreq = Tstop/ No of animation step.

= 0.1927/20

Tfreq = 0.009635‬s

Now to edit the value of the Tfreq in from ENG_ANIM

6.Change /print -10.

7.3d meshing tetra mesh and hex mesh.

OBJECTIVE: To Create a Tetramesh from 2d tria mesh to 3d tetramesh for Housing component.

PROCEDURE:

Step1: To import the model give model to the interface or GUI.

Import>import the model select the file type and import.

Step2: Generating the tria mesh on the surface which is the 2D mesh.

Geom>2D mesh element Size 5 units> selecting the surface
Using R tria in Edge fillet to capture the fillet.

Step3: Now generating the 3d mesh for the components.

3d>tetramesh>Selecting the 2d elements > Mesh
The 3d Tetra mesh is generated.

Step4: Checking for tet collapse which is the element is failure in 3D mesh.

F10 or Tools>check elements>entering the tet collapse value>selecting the tet collapse>save failed.
F5 or Tools>mask>elements>retrive>mask>reverse.
The failed elements are shown
Removing Tet collapse by translate option and tetra remesh option

Pictures of the Model:

RESULT: Successfully meshed the components with a tria element (2D) and then converted into tetrahedral or 3D mesh with the given Quality and mesh parameters.

Hexa Mesh

OBJECTIVE: To Create a Hexamesh from 2d quad mesh to 3d Hexamesh for component.

PROCEDURE:

Step1: To import the given model to the interface or GUI.

Step2: To mesh the pedal with the 2D quad.

Geom>2D> Mesh size 10mm> Select quad only.

3D> element offest selecting the elements and the surface to be followed and number of layers.

Now Hexa mesh is created or solid mesh.

Now to mesh the above component and generate the hexa element.

Now to have only 2D elements in oder to Spin the elemts to create the hexa mesh.

Using mask option or F5> select elements> By config>Hex8 to hide the elements>displayed>Mask.

Now to create the node for the axis of rotation
Using Geom> distance or F4 >three node option>circle centre> the node is created.
The axis is selected Perpendicular to golbal axis of rotation
3D>spin> selecting the elements to rotate > selecting the base point and also providing the angle and the number of elemts to creat> Spin.
The hexa elemets are created.

To create the hexa mesh for the varing cross section component as shown above.

Now to mesh the other side of the component with 2D Elements
Matching the elemets on the other end of the face to avoid the penta elements.

Tools> Faces>selecting the components>Find face to create the 2D elements.

3D> Linear solids> Selecting the elements from one side and also selecting the other elements on the other side.
The Hexa mesh is created in varying cross sections.