Assignment 2

Assignment 2

1. Check the material properties of the rail component and calculate the speed of sound in steel =75
2. The length of the rail is about 1000mm. calculate the time takes for a shock wave to travel from one end of the rail to other =1927s
3. Time for sound to travel length of rail=1927s
4. Edit the engine file so that the stress wave can be monitored, moving from one end of the rail to the other during impact -this will require a termination time equal to the time it takes for the sound to travel the length of the rail(set on/RUN card)

Methodology:

Select FIRST_RUN_00001 file open in note pad as Time for sound to travel length of rail=0.1927s put this value in below (/RUN/FIRST_RUN/1/)

In hypermesh import FIRST_RUN_0000 –analysis – radios- view result. We can see same time step for both simulation have frame 2=1.0561e-02s

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

Methodology:

Select FIRST_RUN_00001 file open in note pad as freq. of animation output=0.009635hzs put this value in below (/ANIM/DT)

• Change /print -10.
• 3d meshing tetra mesh and hex mesh

Repeat class examples and, maintain the quality.

Target Tet size=5mm, hex size=10mm, Tet collapse=0.15.

Methodology: 1) arm bracket

• Open arm bracket.hm file.
• Check for geometry clean up.
• Press f12 –select base sufs-element size=10 –mesh.
• Go to 3D-line drag- select 2D elements- select line perpendicular to mesh element size=10- mesh.
• Create node at center of arm curve –spin – spin element –select 2D arm curve element on the base-select x-axis –select base point which create early – angle 90degree –on spin 10 – spin.
• Faces-select arm curve –find faces.
• Press f12 select arm straight curved portion –mesh –give element no as opposite surf of arm straight.
• Linear solid-select element from arm curve face –select n1,n2,n3 one of the element nodes-select elements of arm straight – select alignment of element of arm straight same sequence as n1,n2,n3- solid.
• Press f12 select sufs of boss – mesh.
• Solid map-general- source geometry: (none), dest geom.: bottom surf of boss, along geom.: mixed-select nodes of the arm straight which are attached to the boss – select line- select elements of boss – element size – mesh.
• Check element.

2) Housing component:

• Open Housing component.hm file.
• Check for geometry clean up.
• Go to 3D teramesh-volume tetra mesh- select all surfs- 2d type: trias,3d type :tetras ,element order :first- check proximity and curvature give min element size =3.5mm, element size =5,tetra parameter tet collapse :>0.15 mesh.
• Check element criteria.