RADIOSS Material Laws Challenge

OBJECTIVE:-

To compare the 7 cases the behaviour of the elements with changes in the materials and properties. plot energy graphs and compare all cases.

CASE1:-

1.First import the file Select→Import→Import solver deck→File→Import.

2.Next click on the import the model is displayed in the graphical area as shown below.

3.Next go to the tab bar and click on the properties as shown below.

4.After changing the properties go to analysis.

5.Select→Analysis→Radioss as shown below.

6.Click on the Radioss the simulation will be run as shown below.

7.It shows the simulation completed shown below while completing the simulation some files are stored.

8.Next check the energy error, mass error and simulation time.

9.In the above files select the FAILURE_ JONSON_0001.out file and open in note pad as shown below.

10.The mass error and energy error are acceptable ranges, simulation time is 63.93s and the total number of cycles is 49380.

11.Next go-to toolbar select page window layout as shown below.

12.Let's divided the graphical area into 3 pages as shown below.

13.Click on the second page and select client selector click the hyper view as shown below.

 change the graphical area as shown below.

14.Click on the apply see the graphical area.

15.Click on the animation and see the below.

 see the behaviour of elements, the elements cracked and fly.

16.Next plot the graphs such as internal energy, hourglass energy, total energy and rigid wall forces.

17.Goto 3rd page and click Select client→Hypergraph 2D as shown below.

18.Next click on global variables →Internal energy→MAG→Apply as shown below.

→INTERNAL ENERGY.

The internal energy is increased with respect to time at the end it is constant.

→KINETIC ENERGY.

The kinetic energy initially starts with zero the time increases the kinetic energy is increased and decreased. At the time 4ms the kinetic energy is going to peak point 180 and Finally, the kinetic energy is increased.

→TOTAL ENERGY.

The total energy is also increased and it is similar to the internal energy graph.

Case2:-

1.Frist import the radios file as already discussed in the above case as follow.

2.After importing the file goto tab bar and select failure as shown below.

3.See the given question those values are given thus why I am changing the values.

4.Goto the main menu bar and select Analysis→Radioss as discussed in the above case same as it is doing.

5.Run the simulations it is completed successfully as shown below.

 The radios job is completed.

6.The simulation files are created as shown below.

 see this figure.

7.Next check the energy error, mass error, simulation time and a total number of cycles see below.

8.The total number of cycles-49217, Energy error is 4.1% it is an acceptable range, the mass error is 0.00 and simulation time is 54.94.

9.Next go to hyper view select h3d file and click on apply as shown below.

10.Next plot the energies graphs as shown below.

 →INTERNAL ENERGY.

 I am observing the internal energy graph it is increased with respect to time at the end it is constant.

→KINETIC ENERGY.

In the Kinetic energy graph, it is slightly increased and decreased with respect to the time and see the end it is going to peak point then slowly decrease.

→TOTAL ENERGY.

In the total energy graph, it starts from zero to increase with respect to time and see the end it is constant in some time.

CASE3:-

1.Here delete the failures and start the simulations as shown below.

2.Run the simulation goto the main menu bar select analysis click on the radios.

 The simulation is completed.

3.Next check the energy error, mass error, simulation time and a total number of cycles.

4.open 0001.out file scroll the bottom and see the values as shown below.

5.See the above figures the Energy error is 0.8% it is an acceptable range, Mass error is 0.000, Simulation time is 65.03s and the Total number of cycles is 49408.

6.Next go to hyper view select h3d file and apply the animation will apply in the screen as shown below.

7.See the material behaviour in the above animation it is slowly deformed and at the end, elements will be separate from the component.

8.Next plot the energies graphs as shown below.

→INTERNAL ENERGY.

In the internal energy graph, it starts from zero ends with approximately 27500 and it is increased with respect to time.

→KINETIC ENERGY.

In the Kinetic energy graph, starts with zero and ends with 90.the peak point is 325 at the time is 4ms Finally, it is increased with respect to time.

→TOTAL ENERGY.

In the total energy graph, It also starts from zero ends with 28000(approximately) so the total energy is increased with respect to time.

CASE4:-

1.Delete the EPS_p_max value goto tab bar and select the materials and click on the aluminium it shows the EPS_p_max value see to zero as shown below.

2.Next run the simulation.

 the simulation is completed.

3.Check the energy error, mass error, simulation time and a total number of cycles.

4.Open the 0001.out file in note pad see these values on the file as shown below.

 

 

5.In the above figures shows,

Energy error is 1.1% it is an acceptable range.

Mass error is 0.000.

Simulation time 63.40s and

The total number of cycles is 49304.

6.Next go to hyper view and select the animation file h3d and click apply as shown below.

7.See the above animation the elements will be deformed properly.

8.Next plot the energies graphs click on the hypergraph 2d and select the T01 file as shown below.

→INTERNAL ENERGY.

In the internal energy graph, it starts zero and ends with 39500 so it is increased with respect to time. the time increases automatically the internal energy also increases.

→KINETIC ENERGY.

In the kinetic energy graph, it starts with 3 and ends with 4.It is slightly increased and decreased and at a time is 4.7 the kinetic energy is going to peak value is 16 as a shown graph.

→TOTAL ENERGY.

In the total energy graph, it starts with zero and ends with 39500 as see the internal energy both are similar graphs and the total energy is increased.

CASE5:-

1.Convert the material into law1 Elastic goto the tab bar select material click on the aluminium as shown below.

2.Next run the simulation as shown below.

 the simulation is completed.

3.Next check the energy error, mass error, simulation time and a total number of cycles.

4.Open the 0001.out file, in notepad, as shown below.

5.Here energy error is 1.3% it is an acceptable range, the mass error is 0.000, simulation time is 63.58s and the total number of cycles 47969.

6.Next go to hyper view select h3d file click on apply as shown below.

7.See the above animation while giving the law1 elastic material the elements having elastic properties when the load is applied see the behaviour it is only stretched.

8.Next go to hypergraph 2D select the T01 file to plot the energies graphs as shown below.

→INTERNAL ENERGY.

The internal energy is increased with respect to time.

→KINETIC ENERGY.

The kinetic energy initially starts at 0 it maintains at 1.8ms time and next it is going to increased and decreased due to some vibrations it causes. At the end of the simulation, the kinetic energy is going to peak value.

 →TOTAL ENERGY.

The total energy is also increased with respect to time.

CASE6:-

1.Import the file LAW27_0000.rad.

2.Next run the simulation goto tab bar and select Analysis click on radios as shown below.

 The simulation is completed.

3.Next check the mass error, energy error, simulation time and a total number of cycles.

4.Goto animation files select 0001.out file open in note pad, it shows those values as shown below.

5.The energy error is -7.1%, the Mass error is 0.000, simulation time is 43.64s and the total number of cycles is 41113.

6.Next go to the hyper view select animation file h3d click apply as shown below.

7.See the behaviour of the elements it is slowly deformed at the end of the elements is beside the component.

8.Next go to hypergraph 2D plot the energies graphs, Select the T01 file plot the internal energy, kinetic energy and total energy as shown below.

→INTERNAL ENERGY.

The internal energy is increased with respect to time.

→KINETIC ENERGY.

The kinetic energy is initial slowly increased at the middle time it goes maximum is 155.and next, it is slowly decreased 50 finally the kinetic energy is increased.

→TOTAL ENERGY.

The total energy is increased with respect to time.

CASE7:-

1.In this case the material law is changed into LAW 36(PLAST_TAB).

2.Go to the tab bar and select material to change the material name into PLAS_TAB click the material as shown below.

3.Next create the new curve by giving the plastic strains(X) and post-yield stress(Y) as shown below.

 

 

4.Next go to the material selected put the value 1 for N_funct and the below fct_ID assign the curve M36 as shown below.

5.Next run the simulation goto the main menu bar select Analysis to click on the radioss to run the simulation.

 the simulation is completed.

6.Next check the energy error, mass error, simulation time and a total number of cycles.

7.Go to simulation files by using note pad 0001.out file open, those values are visible as shown below.

8.In the above figures energy error is 1.4% it is an acceptable range, the mass error is 0.000, Simulation time is 43.39s and the total number of cycles is 48846.

9.Next go to the hyper view and select the animation h3d file as shown below.

 See the behaviour of the elements it is perfect deformation shows the above animation.

10.Next plot the energies graphs goto hypergraph 2D and select the T01 file as shown below.

→INTERNAL ENERGY.

The internal energy is increased with respect to time.

→KINETIC ENERGY.

The Kinetic energy starts with zero ends at 25 the peak value is 37.5 at the time is 2.2ms.

 →TOTAL ENERGY.

 The total energy is also increased with respect to time.

COMPARISON:-

Now going to compare all 7 cases.

Case	No. of cycles	Energy error(%)	Mass error(%)	Simulation time(s)	Elements behaviour
case-1	49380	0.8	0.0	63.93	Deformed and fly the elements
case-2	49217	4.1	0.0	54.94	Cracked and fly
case-3	49408	0.8	0.0	65.03	Cracked and fly
case-4	49304	1.1	0.0	63.4	Cracked
case-5	47969	1.3	0.0	63.58	Stretching
case-6	41113	-7.1	0.0	43.64	Cracked and fly
case-7	48846	1.4	0.0	43.64	Cracked

I am observing the best result in case4 and case7 according to elements behaviour it is only cracked in other cases, the elements are cracked and fly.

CONCLUSION:-

Comparison between material cards and each case observing the behaviour of the elements. Run the simulation in all cases by changing the material cards and plotting the energies graphs. Finding the best result for those cases.