2D 3D Mesh in HyperMesh and Performing animation using Radioss as solver

OBJECTIVE: Surface mesh and volume mesh generation on given housing and arm bracket model.

LINK TO HYPER MESH RADIOSS FILES:

https://drive.google.com/file/d/1h0tOn4b9e9EDoVFqaGuKCjnWRgrHxUvL/view

3D MESHING:

3D Elements should be used when all dimensions are comparable.

x~y~z

Element shape: Tetra, Penta, Hex, Pyramid

Element type: Solid

DOFs for solid elements: 3 Translational and no rotational DOFs.

Quality Checks for TETRA elements:

TETRA Collapse: ideal value 1.0

PROCEDURE :

HOUSING:

The hub was first 2D meshed by assigning parameters like min length, max length, aspect ratio skewness, warping. After removing all errors for given parameters, 3D meshing was done using Tetramesh. Tet collapse was set to 0.15. Any element with tet collapses less than 0.15 has to be fixed. 

 

Cover geometry was directly 3D meshed with Volumetetra with an element size of 5mm.

ARM BRACKET: 3D meshing using brick elements.

This geometry had four parts. Base, arm curve, arm straight, and boss.

The base of the arm bracket was meshed using element offset under 3D Solid mesh. This was done by first meshing one face of the base and then no of layer and thickness was assigned to get the brick mesh.

For meshing arm curve, spin option under 3D solid was used.2D elements from the top face of the base were selected and parameters like axis perpendicular to 2d elements,  center of rotation and on spin equal to 25 were set.

Next arm straight was meshed using linear solid. Here 2 faces were selected between which hex elements have to be created. To get the 3D mesh, no of elements on both selected face must match.

Next part was boss, which was meshed using solid map.

RADIOSS FILES:

Here animation files were created using .rad files. To do this first we imported FIRST_RUN_0000.rad file. To get 20 animation files, for the given runtime of 0.192 ms, which was calculated using speed of sound in a given material(5188m/s) and length of the rail(1metre), animation frequency was changed to 0.0096.

      

no of animation files= runtime/animation frequency

To open the animation file, go to HYPERVIEW and open h3d files.

CONCLUSION:

3D mesh can be generated in 3 ways.

Method1: First creating 2D mesh and then using TETRA option to convert it into 3D MESH.

Method2: Using VOLUME TETRA under 3D. This directly gives 3D mesh.

Method 3: Using Utility quick tetra mesh.

To get better control over meshed elements, method 1 is preferred.

For tetra mesh, tet collapse has to be under control.

For creating a brick mesh, we have to first generate 2D mesh and then have to convert into 3D mesh. There is no algorithm that can give directly 3D brick elements.

_0000.rad is the starter input file and _0001.rad is the engine input file

Animation files was manipulated using runtime and animation frequency input values

Animation files are h3d files and HyperView is used to run these files.

 

LINK TO HYPER MESH RADIOSS FILES:

https://drive.google.com/open?id=1h0tOn4b9e9EDoVFqaGuKCjnWRgrHxUvL

 

 

 

 

 

 

 

 

 

 

 


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