ASSIGNMENT 2

ASSIGNMENT 2

1. DENSITY OF STEEL= 7.8E-3 g/mm³

(YOUNG’S MODULUS)_STEEL = 210000 N/mm²

(SPEED OF SOUND IN STEEL)_STEEL = SQRT (E/Rho)

= SQRT (210000/7.8E-3)

c=5186.52 m/s

1. LENGTH OF THE RAIL = l = 1000 m

TIME TAKEN BY THE SHOCKWAVE TO TRAVEL THE LENGTH= L/C

= 1000/5186.52

= 192.8 ms

1. TIME FOR SOUND TO TRAVEL THE LENGTH OF RAIL = 192.8 ms

5.T_freq = 24.1 ms

7.2D &3D MESHING OF THE 3 COMPONENTs A. HOUSING.HM

1. Firstly , I selected the mixed type wireframe viewing mode so as to check any discrepancies in the geometry, but there weren’t any, so I moved on to 2D meshing.

2.Then I used the automesh feature in the 2D panel to mesh the components.

3.Then , I changed the values for the mesh quality criteria parameters, according the values given in the question.

4.There were a few elements with warpage values more than 15.I used the smooth feature, with no. of iterations =10, to improve the shape of the elements. Then I used the translate feature to decrese the warpage angles to a value below 15 degrees.

5.For elements having values of warpage of about 50- 60 degrees, I used the split feature to split them into trias. The other parameters have no ill elements .

6.Then I used the tetramesh feature in the 3D menu to create 3D mesh.

7.I changed the value of the 3D mesh quality parameters , and there weren’t any ill elements.

B. ARM_BRACKET.HM

1. I made the 3d mesh for the file during the tutorials , so what’s left was to check the 3D mesh for fault elements , and there was no faulty elements when checked in the check elem feature in the tool menu and 3d subpanel.

C. 1D_ELEMENTS.HM

1. One of the two surfaces , in the file was already meshed .So , I used the the distance feature in the geom panel to check the distance between two adjacent nodes to get mesh size for the 2D mesh.
2. It came out to be 0.5 mm. I meshed the whole surface . They were all quad elements with a perfect mesh flow , so there was no need for checking the faulty elements.
3. I used the distance feature again to get the distance between the two surfaces , so as to get the density of the 3D mesh between the two surfaces.
4. It came out to be 5mm, so iset the density to 10, so that the mesh size becomes 0.5 mm.

5. I used the linear solid feature in the 3 d panel , with density equal to 10, and the respective elements selected , the corresponding nodes for the mesh , and then mesh the surfaces , the mesh had perfectly aligned brick elements , so no need for quality check parameters.

• LINKS FOR THE MESH FILES 2D & 3D :

1. HOUSING.HM : https://drive.google.com/open?id=1JKfNtWfAkf6a8HNmRIm6-YsxAz9vBNoX

2. ARM BRACKET.HM : https://drive.google.com/open?id=1dRd6qvCsHhQQ84pJ56dOf03oTNphOFzf

3. 1D_ELEMENTS.HM : https://drive.google.com/open?id=1e4EHJti_K_HERgEuWrNN3zz3qUXRItzk