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

AIM : RADIOSS Engine File Editing & 3D Meshing Challenge

OBJECTIVE :

• To checkthe material properties of the rail component and calculate the speed of sound in steel rail.
• To calculate the time taken for shock wave to travel.
• To edit the engine file so that the stress wave can be monitored.
• To set the frequency of animation otput
• to perform 3D meshing on the given component.

importing and reading RADIOSS starter file:

Import the file FIRST_RUN_0000.rad.

Now to calculate the speed of sound in steel rail,

C=√E/rho

C= speed of sound.

E = young's modulus.

using the values in rail component in the material properties.

E = 210000.0

rho =0.00781.

Calcultions:

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

C=√E/rho

C =√21000.0/0.00781

C= 5188.74521 m/s.

Check the material properties of the rail component and calculate the speed of sound in steel rail = 5188.74 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.

L = 1000mm

speed = Distance / time

time = distance/speed

Time = 1000/5188.74

Time = 0.1927250 ms

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. 0.1927250 ms

3.Time for sound to travel length of rail

Time for sound to travel length of rail = time / no. of animation steps

Time for sound to travel length of rail = 0.1927250 / 20

Time for sound to travel length of rail = 0.00963500

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)

Frequency = (l/c)*time

= (1/0.1927)*20

104HZ

6.Change /print -10.

1D ELEMENT CREATION:

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.

Import the geometry into workspace and make it shaded .

• imprort the geometry of the given model file.
• clean up the geometry of the following models given
• Initially mesh the surface in 2D mesh

• Initially mesh the surface in 2D mesh

check the minimum and maximum element size zero

perform 3D tetramesh using the tria elements. 3D- TETRAMESH.

Check the tet collapse for o15, in tools-check elements - 3D-tet collapse and fix the error.

MODEL:2

CONCLUSION:

• Understood ho wto calculate speed of sound in difeerent material
• Understood how to read input radioss file
• Understood how to import the radioss solver file
• get to know how to create 3D tetra mesh and hexa mesh