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

OBJECTIVE:

• TO CHECK THE MATERIAL PROPERTIES OF THE GIVEN RAIL COMPONENT AND TO CALCULATE THE SPEED OF SOUND THROUGH THE SAME.
• TO CALCULATE THE TIME TAKEN FOR A SHOCK WAVE TO TRAVEL FROM ONE END OF THE RAIL TO THE OTHER WHERE LENGTH OF THE RAIL IS ABOUT 1000 MM.
• SIMILARLY TO FIGURE OUT THE TIME FOR SOUND TO TRAVEL THROUGH THE LENGTH OF THE RAIL.
• 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.
• TO SET THE FREQUENCY OF ANIMATION OUTPUT TO A TIME THAT WILL GIVE 20 ANIMATION STEPS AND TO CHANGE /PRINT -10.
• 3D MESHING THE GIVEN MODELS MAINTAINING THE GIVEN QUALITY.

PROCEDURE:

• TO CHECK THE MATERIAL PROPERTIES, GO TO FILE>IMPORT>SOLVER DECK>'select 000.rad'>IMPORT>@MODELS>@MATERIALS>'check properties as needed'.

HERE WE HAVE GOT THE MATERIAL PROPERTIES AS NEEDED, TO CALCULATE THE SPEED OF SOUND......

c=√(E/ρ) [c-speed of sound, E-youngs modulus, ρ-density]

SO, √(210000/0.0078)=5188.74 mm/ms.

• TO CALCULATE THE TIME TAKEN FOR A SHOCK WAVE TO TRAVEL FROM ONE END OF THE RAIL TO THE OTHER WHERE LENGTH OF THE RAIL IS ABOUT 1000 MM.

Δt_c=l/c [Δt_c-elemental time step, l-length of the rail, c-speed of sound]

SO, l/(√(E/ρ)) i.e 1000/5188.74 =0.1927 ms.

• SIMILARLY TO FIGURE OUT THE TIME FOR SOUND TO TRAVEL THROUGH THE LENGTH OF THE RAIL.

Δt_c= time for sound to travel= 0.1927 ms.

• TO EDIT THE ENGINE FILE SO THAT THE STRESS WAVE CAN BE MONITORED, MOVING FROM ONE END OF THE RAIL TO THE OTHER DURING IMPACT.

MODEL>CARDS>ENG_RUN>Tstop 'edit value as required'.

Δt_c= 0.1927

• TO SET THE FREQUENCY OF ANIMATION OUTPUT TO A TIME, CHANGE /PRINT.

T_freq= Termination End Time/Steps Required =0.1927/20 =0.009635.

MODEL>CARDS>ENG_ANIM_DT>Tfreq 'edit value as required'.

Tfreq=0.009635

MODEL>CARDS>ENG_PRINT>N_print 'edit value as required'.

N_print=-10

• 3D MESHING THE GIVEN MODELS MAINTAINING THE GIVEN QUALITY.

FILE>IMPORT>MODEL>choose>IMPORT.

2D>AUTOMESH>element size '5'>mesh type 'trias'>MESH.

3D>TETRAMESH>TETRAMESH PARAMETERS>min tetra size '5'>tet collpase '0.150'>TETRA MESH>MESH.

TOOLS>CHECK ELEMENTS>3D>TET COLLAPSE.

FILE>IMPORT>MODEL>choose>IMPORT.

2D>AUTOMESH>element size '10'>mesh type 'quads'>MESH.

3D>ELEMENT OFFSET>2D ELEMENTS TO OFFSET>ALONG GEOMETRY TO FOLLOW>NUMBER OF LAYERS>TOTAL THICKNESS>OFFSET+/-.

3D>SPIN>2D ELEMENTS>angle '90'>on spin '25'>select axis>select base node created>SPIN+/-.

TOOLS>FACES>FIND FACES>3D>LINEAR SOLID>FROM/TO and ALIGNMENTS>DENSITY '15'>SOLIDS.

2D>AUTOMESH>element size '10'>mesh type 'quads'>MESH.

3D>SOLID MAP>SOURCE GEOM 'none'>DESTINATION GEOMETRY>ELEMENTS TO DRAG>ALONG GEOMETRY 'mixed' - select as needed>MESH.

SCREENSHOTS

Checking material properties @Smaple 1.

ENG_ANIM_DT edit @Sample 2.

i/p file after Radioss @Sample 3.

Time step file formation @Sample 4.

3D Meshed and masked @Sample 5,6 and 7.

Hexa Mesh formation @Sample 8 and 9.

RESULT

CALCULATED THE SPEED OF SOUND THROUGH THE GIVEN RAIL COMPONENT BY CHECKING THE MATERIAL PROPERTIES.

CALCULATED THE TIME TAKEN FOR A SHOCK WAVE TO TRAVEL FROM ONE END OF THE RAIL TO THE OTHER.

EDITED SUCESSFULLY THE ENGINE FILE SO THAT THE STRESS WAVE CAN BE MONITORED, MOVING FROM ONE END OF THE RAIL TO THE OTHER DURING IMPACT.

CHANGED THE FREQUENCY OF ANIMATION OUTPUT TO A TIME THAT WILL GIVE 20 ANIMATION STEPS.

3D MESHED THE GIVEN MODELS (TETRA AND HEXA) MAINTAINING THE GIVEN QUALITY.