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

AIM

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Meshing of the 3 components as per the target element length and answer the following question reasonably.

OBJECTIVE

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• Answers the following questions given.
• Deploy the beam connection between two meshed plates and also deploy Line mesh.
• Hexa mesh on the “ARM BRACKET” component.
• Solid mesh on the “HOUSING” component.

Detail

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

Soln: Different material properties of rail component are

1 High wear resistance

2 Resistance to deformation caused by compression

3 High fatigue strength

4 High yield strength, toughness/tensile strength and hardness

5 High resistance to brittle fracture

6 Good weldability

7 Low residual stresses after manufacturing and straightening

Speed of sound of steel rail will be = `sqrt((Young^' s Modulus)/ Density)`

= `sqrt (210/7800`)

= 5,188.7452166277082559808867736521m/s

2 The length of rail is about 1000mm.Calculate the time takes for shock wave to travel from one end of the rail to other.

Soln: Time takes for shock wave too travel from one end to another of length 1000m is =`1/5188.92`

= second

= 1.927E-4 second

3 Time for sound to travel length of rail

Time =length of rail/ speed of sound

=`30.489/5188745`

= 5.87E-6 seconds

4 Edit the engine file so that stress can be monitored, moving from one end of rail to other during impact this will require termination time equal to times it takes for the sound to travel the length of the rail (set on/RUN card).

Soln: This is the run card which signifies at what time duration the simulation will go.

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

Frequency is the inverse of time step.

so v = 1/0.192

= 104 hz

6 Charge /Print – 10

This sets printout frequency for output file.

If N_print is negative then print out is made in the standard output.

If N_print is positive then print out is only made in output file.

7 Meshing of 3 components

Quality criteria

max length 7

min length 3.5

aspect ratio 5

Warpage 15

Skewness 60

Jacobian 0.5

tria angles 20 to 120

quad angles 40 to 140

3D mesh tetra and hex mesh

Target element length for tetra is 5mm and hex is 10 mm and tet collapse is 0.15

Procedure for meshing

1 Check for the connection

2 Quality criteria

Preferences < Criteria file setting

3 Meshing

Tetra mesh

Mesh panel < 3D < tetramesh

Hexa Mesh

Mesh panel < 3D < line drag

2D mesh

Beam element

1D < bars

CONCLUSION

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Hence all the 3 components are meshed and all the questions is being answered.