Assignment 3-2D Element Formulation Challenge

OBJECTIVE

• RUN THE BASE SIMULATION (ASSIGNMENT 2 FILES) AND COMPARE THE RESULTS OBTAINED WITH SAME FILE AFTER MODIFICATION AS SPECIFIED BELOW.

run time = 55 ms.

animation steps max @60 and min @25.

I_shell = 24

I_smstr = 2

I_sh3n = 2

N = 5

I_thick = 1

I_plas = 1

COMPARE THE MASS AND ENERGY ERROR, VARIATION IN RIGID WALL FORCES, INTERNAL ENERGY, KINETIC ENERGY, HOURGLASS ENERGY, TOTAL ENERGY, CONTACT ENERGY V/S TIME.

PROCEDURE

• FILE>IMPORT>SOLVER DECK>FILE 'select file - 000.rad'>IMPORT.
• ANALYSIS>RADIOSS>INPUT FILE 'select destination'>RADIOSS.

ALL SIMULATION FILES ARE SAVED IN THE DESTINATION FOLDER.

TO PLOT ERROR GRAPHS, GO TO

• HYPERMESH>HYPER GRAPH 2D>DATA FILE 'select T01 file'>'select subcase variables x/y components'>APPLY.

FOLLOW THE SAME AFTER EDITING THE BASE FILE (000.rad), TO MODIFY CARDS AND PROPERTIES AS SPECULATED...

• @HYPERWORKS>MODEL>CARDS>ENG_RUN>Tstop '55'.
• MODEL>CARDS>ENGINE_ANIM_DT>Tfreq '1.375'.

T_freq=Run time/Animation Step =55/40 =1.375, for animation step took average of maximum and minimum given.

BY CHECKING THE GRAPH, ENERGY ERRORS ARE WITHIN THE SPECULATED VALUE AND MASS ERRORS REMAINS THE SAME. RESULTS OBTAINED ARE ACCEPTABLE.

GRAPHS ARE COMPARED AS PER THE REQUIREMENT...

• RIGID WALL FORCE VS TIME.
• INTERNAL/KINETIC/TOTAL/HOURGLASS ENERGY VS TIME.
• CONTACT ENERGY VS TIME.

SCREENSHOTS

• BASE FILE WITHOUT EDIT @Sample 1
• EDITED CARDS AND PROPERTIES @Sample 2,3 and 4.
• UN-EDITED FILE GRAPHS @Sample 5,6 and 7.
• EDITED FILE GRAPHS @Sample 8,9 and 10.

RESULTS

• CHANGING THE RUN TIME, ANIMATION STEP AND VARIOUS MATERIAL PROPERTIES WAS DONE AND SIGNIFICANT DIFFERENCES WERE NOTED WHILE PLOTTING FORCES AND ENERGIES.
• AS WE HAVE INTRODUCED PROPERTIES TO THE MATERIAL, MORE AMOUNT OF FORCE IS GETTING TRANSFERRED TO THE WALL WHICH CAN BE SEEN. (Sample 5 vs 8)
• THE CALCULATIONS HAVE MORE ACCURACY AT THE ELEMENTAL LEVELS BY GETTING ACCURATE RESULTS SINCE THE INTRODUCTION OF QEPH and Ismtrn.
• HOURGLASS ENERGY INCREASES WITH TIME @Sample 6 BUT @Sample 9, THERE IS NO HOURGLASS BECAUSE THE NODAL CALCULATION TAKES EXCESSIVE AMOUNT OF DEFORMATION.
• MORE AMOUNT OF ENERGY IS GETTING TRANSFERED DUE TO APPLIED PROPERTIES, THE MAGNITUDE OF APPLIED PROPERTIES HAS GONE DOWN. @Sample 7 CONTACT ENERGY AT 2500 AND @Sample 10 CONTACT ENERGY 6200.

HOURGLASS ENERGY ARE ZERO ENERGY DEFORMATIONS I.E ELEMENTS ARE SEEN DEFORMED BUT NO ENERGY RECORDED. THESE OCCOUR IN UNDER INTEGRATED ELEMENTS AND PRODUCE NO STRESS BUT CAN LEAD TO ELEMENT DISTORTIONS.