Assignment 2
1. Check the material properties of the rail component and calculate the speed of sound in steel rail=_______
Material properties from FIRST_RUN_0000
Density of Steel,`ρ` = 0.007850 g/mm3
Young's Modulus, E = 210000 N/mm2
Elemental Time Step Equation, `δ t c = l/c = l/sqrt (E/rho)`
From this, `c = sqrt (E/rho` ` = `sqrt ((210times 10^3)/ (7.8times 10^-3` = 5188.737
Therefore peed of sound in steel rail = 5188.737 mm/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.
We have, `δ t c = l/c = 1000/5188.737 = 0.192725`ms
3. Time for sound to travel length of rail = 0.19272 ms
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, F = Termination time/Animations Steps
= 0.192725/20 = 0.009636 ms
6.Change /print -10.
7.3d meshing tetra mesh and hex mesh
Housing - Tetra Mesh
Arm Bracket - Hexa Mesh
Learning outcome:
- Tetra meshing and Hexa meshing using Hypermesh.
- Time step calculation.
- Learned to understand details in a starter Input Deck and Engine Input files.