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

AIM:

• To study the starter file and Enginefile using RADIOSS profile
• Change the parameters according to the requirement in starter file and Enginefile.
• creating Tetra mesh on housing component Hexa mesh on Arm Bracket

OBJECTIVE

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.

Procedure:

Import rad file in HYPERMESH.

open hypermesh select import

1.checking the material properties &calculating speed of the sound in mateial

goto Model<materials<steel

• we can check the material properties by opening rad000 file in notepad also

• Speed of the sound C=`sqrt(E/rho)`

`sqrt(210000/0.0078)`=5188.745 m/s.

shock wave travels with speed of the sound .shock wave speed=sound speed

=5188.745m/s

2.calculate time taken for shockwave to travel one end to other end.

Time= distance /speed

= 1000/5188.745

= 0.192725 ms

3. Calculate time for sound to travel in length of the rail = 0.192725 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)

• In run card it is given 60ms so change it to 0.192725
• change it in FIRST_RUN_001

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

frequency= Time taken/no of animation steps

= 0.192725/20

=0.00963625.

• change this value in radioss file by selecting model check<Cards

6.Change /print -10.

print value is changed by selecting model check<cards<ENG_PRINT

7.3d meshing tetra mesh and hex mesh.

Housing component:

CAD model:Housing Model

Procedure:

• Imort the model by selecting import<model
• keep the graphics area in topomode then delete solids by selecting delete<solids<displayed<delete
• quality parameters should be given by selecting Tools
• then delete fillets which are having less then 2mm
• geometry cleanup should be done by geometry clean up tools.
• remove surfaces having less distance.
• for meshing Go to 2D<automesh<Target element length 4<trias<surfaces<select displayed.2D mesh will be generated.
• For quality check Goto Tool<check elements.adjust the failed elements till failed element become zero
• Now we have to convert 2D mesh into 3d tetra mesh by selecting 3D<tetra mesh<select elements<displayed<then click on mesh
• now we have to check the quality of 3D mesh.Go to tool <check elements<3D<tet collapse we have to work on the model upto tet collapse become zero.
• same procedure have to be followed for model 2.

Hexa meshing of ARM BRACKET:

CAD file:

Procedure:

• Imort the model by selecting import<model
• keep the graphics area in topomode then delete solids by selecting delete<solids<displayed<delete
• hide all components except base.
• mesh Top surfa ce with quad elements by 2D<automesh<surfaces<select top surface<element size 10<quads only<click on mesh

• Then go to 3D<element offset< select solid layers<element offset select elements<along geometry to follow(select two side faces)< No of layers will be 5<click on offset+

• Now hide 3D elements by selecting tool<mask<click on elements<by configure<hex8<displayed<mask.now we have only 2D elements
• For arm curve we use spin option for this.Go to 2d<spin<select 2d elements which we want to spin<we need a centre point go to distance<3node<drag mouse on the line select points randomly<select circle centre.

• give angle 90<on spin 25<select axis as x-axis<select base point<select spin-

• go to tool<faces<components<select model 4<click on find faces.
• Hide all components Except arm straight go to we need destination elements for linear solid command<go to 2d<automesh<mesh<mesh elements should be same as source elements.
• go to 3D<linear solid<from elements <select elements<to elements<select elements<alignment<select 2nodes in from elements<alignment<select 3nodes in to elements<density=12<select solids
• go to tools<faces<delete faces

• for boss we need to mesh top surace 2d<automesh <select surfaces and adjust the mesh.
• then create a tempnode by projecting node on this line

• Go to 3D<solid map<general<source geometry none <destination geometry select bottom surface<along geometry as nodepath<elements to drag select topsurface elements<click on mesh

• we need to delete 2D elements go to delete<elements<by configure<quad4<displayed<select entrities<delete

conclusions :

calculations are done successfully and edited them in the engine file.

tetra mesh and hexa mesh has done on the given models