Assignment 2

Assignment 2

Questions:

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

-- Speed of sound in steel rail

Given:

E = 210000 N/mm²

Density = 0.0078 g/mm³

Unit system is in grams, millimetre and milliseconds from starter input file.

Hence by substitution we get speed as 5188.78 mm/ ms or 5188 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.

-- t = L / c

Where L length of the element and c is speed of sound in the material

Given L = 1000mm ; c = 5188.78 mm/ ms

Hence by substitution we get time as 0.192 ms

3.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)

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

-- Dividing the termination time by 20 will give the animation output time as 0.0096 ms

5.Change /print -10.

--

Objective

Generate the FE Model of the given cad model using the given quality criteria.

Target tet size=5mm,hex size=10mm,tet collapse=0.15

Procedure

1. Open the given CAD and understand the geometry for meshing
2. Perform 3d meshing – Tetramesh/ Brickmesh
3. Check for tet collapse

Briefing about the options used to generate the 3d mesh.

In the 3d panel Tetramesh

• First perform 2d meshing with trias on the surface of the model
• Go to tetramesh , give parameter such as tet collapse and min element size
• Select 2d trias and perform the mesh

Brickmesh

• Use element offset option for offsetting 2d mesh across the geometry to create a 3d mesh
• Use Spin elems for spinning the mesh across the angle of rotation.
• Solid map for dragging 2d elems with parameters such as source, destination geometry , along the given vectors

Results

FE Model is generated.

Drive Link - https://drive.google.com/file/d/1TFzZdw_yFvth6d6a05U-YszVL9LVGyAY/view?usp=sharing