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

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

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.

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

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)

6.Change /print -10.

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.

Solution:

Speed of sound', C= √E/ρ

for steel, E= 210000.0 MPa

              ρ= 0.0078 g/mm^3

∴ C=  √210000/0.0078

∴ C= 5188.75 m/s

speed of sound in still rail is 5188.75 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.

Speed = Distance/Time

∴ 5188.75= 1000/ T

∴ T= 0.1927ms

3. Time for sound to travel the length of rail=0.1927ms.

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)

6. Change /print -10.

open 0001.rad file in text:

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.

case1: housing

import geometry

go to 2D>automesh> element size >5 >type >tria >mesh

select the 3D> tetra mesh option

check quality, fix element tet collapse<0>

case 2: arm bracket

import geometry

mesh base surface

drag 5 layers

select elements and spin -90 based on x-axis

use 3d-linear solid 

create 2d mesh

use solid map-general

final mesh

Conclusion:

The animation time,sound wave propagation and the engine file edit was done. The model was tetra meshed with the given tet collapse condition.