3D MESHING AND ANALYSIS OF RADIOS FILES IN HYPERMESH

Aim 

1.To check the material properties of the rail component and calculate the speed of sound in steel rail.

2.To calculate the time taken for shick wave to to travel from one end to the other end of the rail and time for the sound to travel length of rail.

3. Edit the engine file of steel rail component.

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

5. 3D Meshing of the given files.

Solution

1.Our task begins with opening the First_RUN_0000.rad file .After this we open the file using notepad and we get the following displayed:

Now the following information can be read as follows :

Material = Steel

Density  =  0.0078 g/mm^3

Young Modulus = 210000 Gpa

The speed of sound in any material is given by the formula:

Speed of sound in any material = (Modulus of Elasticity/ Density of material)^1/2

                                              =    (210000/0.0078)^1/2

                                              =  51888 mm /s

Therefore the speed of sound in Steel is 51888mm/s.

Now we will calculate the time takes for a shock wave to travel 1000 mm from one end to the other end of the rail component.

Since we know the speed of sound in steel and distance it has to travel is 1000 mm we can calculate the time as the formula for time is given by:

Time = Distance / Speed

Time = 1000/51888

        = 0.0192722 s

Therefore the time taken to travel 1000 mm is 0.0192722 s .

2.Editing Engine file in Hypermesh

Now the default engine file is given by :

Now in order to edit the engine file we will open it using the notepad .After editing  the file we get as follows :

Now after the run time has been edited we will edit the frequency of animation so we will get 20 animation steps.Now frequency is given by 

Frequency =    Termination time/no of steps

Therefore Frequency =  0.0192722 /20

                               = 9.638*10^-4

Hence inputting this value in the notepad we get :

Hence the engine file has been edited .

3. 3D MESHING OF THE COMPONENTS

We will be 3D meshing the following parts :

a. Housing

b. Arm Bracket

a.Housing

We will first create 2D meshing and using that 2D meshing we will create 3D meshing for the whole component.

Creating the 2D meshing:

As you can see 2D meshing has been created with element size 5mm and trias being used.

Now a 3D mesh has been created using tetramesh by using minimum tetra size of 3mm and using 0.15 in tet collapse.

After this we will check for any failures in elements for tet collapse  and the following results were obtained for quality check:

Now we will go for the meshing of the covering of the component:

As you can see the meshing of the above component has been done with volume tetrameshing with 5 mm element size and 0.15 tetra collapse

b.Arm Bracket

Now we will go forward with 3D meshing of arm bracket as follows :

We will mesh the sub components of arm bracket in order to get the whole mesh:

Meshing of the base :

As you can see we have applied quads with element size of 10 .

Now we will go for the meshing for arm curve as shown:

After meshing with quad elements and element size of 10 mm we have :

We use quad elements with element size of 10 mm.

Now we will go for the meshing of arm staright component as shown:

Now we have meshed it again with parameters as mentioned above.

Now we will be meshing the bosh as shown first we create 2D mesh and after that we project it so that we get a 3D mesh.

Creation of 2D mesh as shown :

Element type = Quads only

Element size = 10 mm

As you can see a 2D mesh has been created but the no of nodes on the inner surface are not equal hence the mesh created is not aligned and smooth ,hence we will make it equal so that they become aligned and smooth .

As you can see the total no of nodes on the inner and outer boundary are equal and hence we get aligned and smooth surface.

Now in order to make a 3D mesh we will use project command and select a node for guidance aslo a surface till where the 3D meshing will take place as shown:

Now after using projection and solidmap command we get :

Hence the the whole component has been 3D meshed