Challenge

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

RRisheb Rasheed27 Aug 2021

Assignment 2

Objective

To 3D mesh the given components
To modify the .rad file and calculate timestep

Procedure

Given Density =0.0078 g/mm³Youngs Modulus E=210Gpa
Speed of Sound = `sqrt (E/rho)`
Applying the values to the formula above, we get the speed of sound as 164.08 mm/s
The length of the rail is 1000mm
The time is taken for sound to travel across the rail = `l/sqrt(E/rho)`
This gives us a value of 6.094 seconds
To calculate tfreq for 20 animations the formula is= 6.094/20 =0.3047
The desired changes can either be directly added to the .radfile but care needs to be taken that the number of digits remains the same

Figure 1

An alternate method is to modify the files using hypermesh
Import the .000rad file using import solver deck.

Figure 2
Make the necessary changes in ENG_ANIM_DT,ENG_RUN and ENG_PRINT Cards

Figure 3

After the changes are made,it is necessary to export it to a folder

Figure 4

After exporting,open the .0001 rad file in notepad to verify the changes.

Figure 5

The 3D meshing of the given models
Criteria

Tetra element Length=5mm

Tet collapse = 0.15

Using Volume tetra mesh

Figure 6

Set element length to 5 and mesh the volume.Mask a few elements to confirm volume formation

Figure 7

Check for tet collapse of 0.15 in check elements 3D panel, use tetra remesh if necessary

Figure 8

Similarly, for the second component follow the same procedure.

Figure 9

Mask elements to confirm volume formation

figure 10

Check for tet collapse of 0.15

Figure 11

The final Meshed Model is shown below.

Figure 12

Figure 13

For Hexa meshing, we start from the base and create a pure quad mesh of size 10mm.

Figure 14

Using this layer we offset it using elem offset command to create the solid layer

Figure 15
Now we move to the arm for which we will use the spin command
Before we do this, we can mask the formed Hexa elements for simplicity using the by config option

Figure 16

After this, we need to form a centre for the given curve using the 3node circle centre option.

Figure 17

Select the appropriate elements and point to spin, set angle to 90 and on spin to 25

Figure 18

Figure 19

Use spin- to get the desired result.

Figure 20

Now for the next component, we will use linear solid to generate the Hexa mesh
Before that, using the faces option, we generate 2d elements of the arm component

Figure 21

Figure 22

Then, we mesh the last surface of the component making sure the number of elements is the same as the previous one

Figure 23

In 3D linear solid, we now select the elements accordingly.
Note: For alignment, you must select mirror elements

Figure 24

Figure 25

After meshing we get the hex meshed component.

Figure 26

For the final component, we will use the solid map to generate the 3d mesh.
First, we generate the 2d mesh on the surface
Now, we project a node to the bottom surface to further improve mapping accuracy.

Figure 27