Assignment 2

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

• Density: 7.8 x10^-3g/mm3
• E =210000 Pascal
• Answer: C=5.188 x10^3mm/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.

3.Time for sound to travel length of rail= 0.19ms

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)

Updated to have 0.2ms (~0.19) run time

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

Updated to have 0.01ms (~0.0096ms)

6.Change /print -10.

7a. Tetra mesh of Cover and Hub.

Tetra mesh of the Cover and Hub is created by

2D --> Automesh --> selecting surface --> Mesh with tetra mesh

3D --> Tetramesh --> selecting elements

(or)

3D --> Tetrmesh--> component

7b. Hex mesh of Arm bracket.

Base:

2d mesh is created on one side of base

Then, 3d mesh is is done by element offset.

Arm curve.

The centre of the Curve arm is created by using Distance option

Then, 3d mesh is created using Spin elements option using previously created 2d elements

Arm Straight.

The Straight arm is meshed using Linear solid command

Bush.

The Bush is meshed using solid map command.

Conclusion.

Thus Hub and Arm bracket is 3d meshed.