Solid Meshing Using HyperMesh

Link for google drive

https://drive.google.com/drive/folders/1pXltUlPnywvpjebxUP5wN5gg1DZcDQwk?usp=sharing

Question and Answer

1. Speed of sound in Steel Rail will be around 5188.7 mm/ms.

2. The time taken for the shockwave to travel 1000 mm is 0.192 ms.

3. Time for sound to travel the length of rail = 0.192 ms.

4. Edited Engine file snippet

5. Frequency of animation output to time for 20 animation steps shall be 0.009635.

Aim

To model the given test subjects with Terta and hex Elements and satisfy the element criteria. Also provide some 1D connections in the test sample.

Procedure

1. Tria and Quad Element are used as a stepping stone for the 3d element Modeling.

2. One of the methods used for modeling Arm bracket was to use options like Solid map, Linear Solid and Solid Mesh in order to drag the 2d element over the components. Since the cross-section is uniform without any slot or cuts, it's easier to drag the elements. Since the arm bracket is having breakdown into 4 components like base, Arm Curve, Arm Straight and boss only requirement is to have element connection between all the sub-components to have an enclosed for the hex modeling.

3. For the Bracket and housing test sample, we will get rid of free edges and T connection and have an enclosed surface. Mesh the whole outer surface with trias and make sure no free edge or connection is available. Use Shift + F3 to find the edges.

4. Create a new component and make it current. Now Use the tertamesh option, choose elements, and split quads into trias. Under the parameter radio button on the left side, put 0.15 for tet collapse and finally mesh the component.

5. Make the housing as current again and then right-click and choose isolate option. Press F2 to delete the 2d elements that were used to draw out the trias.

6. Press Shift+f11 to send the tetra element made to the original component. Check the element criteria for tet collapse.

7. For 1d element, First mesh both the surfaces and then use the various option like bar, rigids, spring, etc.

Modeling

1. Arm Bracket

2. Bracket

3. 1D Element

Element Criteria

1. Hex Element

2. Tetra Element

Result

1. Arm Bracket

Equia Skew for the Hex Element is 0.417.

The maximum length is 10.79 which is around the target length for Hex Element.

2. Housing

The target Tet Collapse is 0.15.

3. 1D Element

1D connections like Truss, Rigids (RBody), Beam and RBE3, etc were used to connect both the surfaces. These connections are necessary for depicting certain scenarios without modeling everything like bolts, Weldments, etc.