Assignment 4-RADIOSS Material Laws Challenge

Case 1

• Import the FAILURE_JOHNSON_0000.rad file and run the model as it is. Give the title name as Law2_epsmax_failure.

Ans:

Import the model

Perform the simulation.

Simulation result with ploted graph with Energies

f

Simulation Time :- 211.88 s

Error percentage :-0.8%

Mass Percentage :- DM/M= 0.0000E+00

TOTAL NUMBER OF CYCLES : 49380

Case 2

• Import the case 1 rad file, named “Law2_epsmax_failure” and perform the simulation with failure plastic strain (EPS_p_max) and fail_Johson card enabled.
• Changes to be made in /FAIL/JOHNSON card:

• ifail_sh= 1
• Dadv= 1
• Ixfem= 1

• Use the recommended values for the property card.
• Give the title name as Law2_epsmax_crack.

Ans :-

Import the case 1 rad file.

Changes to be made in /FAIL/JOHNSON card and simulated.

Simulated.

Ploted energies graph

TOTAL NUMBER OF CYCLES : 49217

Energy error:- 4.1%

Mass error:- 0.0000E+00

Simulation time :- 600.50 s

Case 3

• Import the case 2 rad file, named “Law2_epsmax_crack” and perform the simulation by removing the fail_Johnson failure card. Give the title name as Law2_epsmax_nofail.

Ans :-

Simulated.

Ploted Energy graph.

TOTAL NUMBER OF CYCLES : 49408

Energy error:-0.8%

Mass error:- 0.0000E+00

Simulation time :- 127.50 s

Case 4

• Import the case 3 rad file, named “Law2_epsmax_nofail” and perform the simulation by removing both the failure plastic strain (EPS_p_max) and the fail_Jhonson failure card.

Ans :-

Removed the plastic strain (eps_p_max) and simulated.

Ploted Energy graph.

Total number of cycles : 48737

Energy error:-3.0%

Mass error:- 0.0000E+00

Simulation time :- 128.13 s

Case 5

• Import the case 4 rad file and perform the simulation by changing the material card to Law 1. Keep the same value for rho, E, and nu values.

Ans :-

Changed the material card as Law 1 (elastic) and given the parameters as same.

Simulated.

Ploted a Energy graph.

Total number of cycles : 47969

Energy error:- 1.3%

Mass error:- 0.000

Simulation time :-162.30 s

Case 6

• Import the case 1 rad file, named “Law2_epsmax_failure” and perform the simulation with the law 36 material card. Refer to the video titled "Materials 7" for further information.

Ans :- Assigned the material card as Law 36 an d given parameters. aploted a curve and assigned to it.

Simulated.

Ploted a Energy graph.

Total number of cycles : 53143

Energy error:--1.9%

Mass error:- 0.000

Simulation time :- 153.46 s

Case 7

• Open the Law27_0000.rad file and perform the simulation with the law 27 material card. Use the recommended shell properties.

Ans :-

Imported the law 27 model and assigned material card as law27-pals-brit.

Assigned the shell properties as recommended .

Simulated.

Ploted Energy Graph.

Total number of cycles : 49508

Energy error:-0.8%

Mass error:- 0.000

Simulation time :- 143.94 s

1. The Total number of cycles, Energy error, mass error, and simulation time.

Cases	Total number of cycles	Energy error	Mass error	Simulation time
Case1	49380	0.8%	0.0000E+00	211.88 s
Cases2	49217	4.1%	0.0000E+00	600.50 s
Cases3	49408	0.8%	0.0000E+00	127.50 s
Cases4	48737	3.0%	0.0000E+00	128.13 s
Cases5	47969	1.3%	0.0000E+00	162.30 s
Cases6	53143	1.9%	0.0000E+00	153.46 s
Cases7	49508	0.8%	0.0000E+00	143.94 s

A

Case 1 :- we were used johns material card and simulated ,then the element is deleted feom the material because we were gievn Maximum plastic strain as 0.15 means 15% palstic strain failure .

Energy Graph :- After the maximum plastic strain ,the material falied and element deleted .

In case 2 ,Assigned Failure johnson and given the values of

• ifail_sh= 1
• Dadv= 1
• Ixfem= 1 ,

hence the material is failed in the plastic region oin the range of 0.15 but only crack happen because we were given Ixfem as 1.

Case 3 :- Removed the johnsons failure and simulated then the element is deleted from the material.

Case 4:- Removing johnsons failure and failure plastic strain (EPS_p_max) ,then simulated.then the maerial is only elasted only ,not deleted or cracked because we removed thefailure plastic strain.

Case 5 :- Changing the material card as Law 1 (Elastic) ,keeping the same E,Rho and Poissons ratio and simulated .then l got the material is stretcing behavour due to elastic proerty.

Case 6:- Import the case 1 rad file, named “Law2_epsmax_failure” and perform the simulation with the law 36 material card . then simulated and i got the contact element is fully deleted because we were using material card as Platic-TAB ,then after maximum plastic strain ,the element is failed and delelted from the material.

Case 7:-Open the Law27_0000.rad file and perform the simulation with the law 27 material card and simulated we were used brittle marerial,we were the stetched and the max plastic strain then the after the plstic strain its directly we to maximum tensile failure and the element is failed and deleted from the material.

Energy Graphs :-

Case 1 :- we were used johns material card ,Maximum enenrgy is 26492 kgmm2/ms2 and after that the stress being contant and the material failed.

Case 2 :- ,Assigned Failure johnson ,the Maximum enenrgy is 29160 kgmm2/ms2 ,the energy graph is linearly because we were added johnsons failure hence we wrer give a maximum plastic strain and after plastic strain the material is cracking .

Case 3 :-We were removed the johnson failure ,hence the maximum energy is 2722kgmm2/ms2 and the energy graph is after reached the maximum plastic strain the material breaks and enengry being contant.

Case 4 :We were removed Johnsons failure and plastic strain (EPS_p_max).then the materila can behave like elatic behavour ,the energy grapg is linearly .the materimum enenrgy is 61458 kgmm2/ms2 hence there is no deletetion of element .

Case 5 :Changing the material card to Law 1 ,then the material is in elastic .the energy graph is linearly . The maximum enenrgy is 8.0126E+05 kgmm2/ms2,which has a maxiumu enenrgy compare to reset cases beacaue materila has elastic property ,hence it can got at maximum limit ,if we unloaded the material will regbains its orginal position.

Case 6:Import the case 1 rad file and changed the material card as law 36 material card. the maximum enengry is 38453 after that the material failed and deleted from the model.the grapg is linear upto maximum enenrgy after that its being variated due to the material.

Cse 27 :- law 27 material card which is a brittle materilal ,hence it maxumum enenrgy is 31446 kgmm2/ms2 after that the maerioa is failed and deleted .

* Mostly case 2 is used in the filed senario.