Assignment 4-RADIOSS Material Laws Challenge

OBJECTIVE: Aim to run the analysis for different materials , plot the graph and compare the results.

CASE1: To run the given model in the name of law2_epsmax_failure without making any changes.

1. To import the given file into the GUI.

• Import>import solver deck>selecting the 0000.rad file>import.

2. Now to open material card.

• Under model tab> material card and failure card have been made no changes.

3. After reviewing the material card saving the model and runing the simulation.

• Choosing the destination to save the simulation files.
• -nt 4 it is the command which will use all the 4 cores to run the simulation.
• Analysis>Radios>saving the file>Radioss.

• From the above result the energy error 0.8% which is in the acceptable range
• The mass energy error is 0.

4. Since all the Errors are falling under acceptable range now runing contour simulation for Von mises stress.

• Hyper view> selecting the h3d file to run the animation from the analysis file>apply.
• To plot Von mises and displacement stress using contour Plot

• From the above simulation
• Maximum von mises stress=316.3MPA
• Here we can see that the elements are deleted because the stess is greater than the EPSmax.
• The plate has ruptured completely

5. To Plot internal energy, hourglass energy, contact energy, total energy for the simulations.

• Now selecting T01 file obtained from the analysis folder
• Global variable> selecting internal energy, hourglass energy, contact energy, total energy and kinetic energy to be ploted >Mag>Apply.

• Internal energy increases linearly till 4ms and then energy becomes constant after deletion of the elements.
• kinetic energy reaches to the peak when elements are deleted at 4ms
• Contact energy and hour glass energy is zero.

Case2: To make changes in the Fail/Johnson card Ifail_sh=1, Dadv+1 and Ixfem=1. Run the model as law2_epsmax_crack.

1. Model tab> Failure_Johnson_1

• Changed the values of Ifail_sh=1, Dadv+1 and Ixfem=1.

2. After making necessary changes to the card now runing the simulation.

• From the above result the energy error4.1% which is in the acceptable range
• The mass energy error is 0.

3. Since all the Errors are falling under acceptable range now runing contour simulation for Von mises stress.

• From the above simulation
• Maximum von mises stress=295.1MPA
• Here the cracking of elements is seen and then the elements are deleted.

4. To Plot internal energy, hourglass energy, contact energy, total energy for the simulations.

• Internal energy is increasing linearly till 4.6ms and becomes constant becuase of the element deletion occurs at time.
• Kinetic energy is reached to its peak at 4.6ms when the elemts are deleted.
• Contact energy and hourglass energy is zero.

Case3: To delete/ fail/johnson card and to rub the model as Law2_epsmax_nofail.

1. deleting / fail/johnson card.

• The above card Failure johnson_1 card is deleted.

2. After deleting the Failure johnson_1 card now runing the simulation.

• From the above result the energy error 0.8% which is in the acceptable range
• The mass energy error is 0.

3. Since all the Errors are falling under acceptable range now runing contour simulation for Von mises stress.

• From the above simulation
• Maximum von mises stress=310.9MPA
• There is no crack observed but the elements are deleted.

4. To Plot internal energy, hourglass energy, contact energy, total energy for the simulations.

• Internal energy increases linearly till 4ms and then energy becomes constant after deletion of the elements.
• kinetic energy reaches to the peak when elements are deleted at 4ms
• Contact energy and hour glass energy is zero.

Case4: To delete the value of EPS_pmax and run the model with name Law2.

1. From the material card changing the values of EPS_pmax to 0.

2. After changing the values of EPS_pmax to 0 and now runing the simulation.

• From the above result the energy error 1.1% which is in the acceptable range
• The mass energy error is 0.

3. Since all the Errors are falling under acceptable range now runing contour simulation for Von mises stress.

• From the above simulation
• Maximum von mises stress=325MPA
• There is no deletion of the elements because the by changing the values of EPS_pmax to 0 it will take the default values which is higher.

4. To Plot internal energy, hourglass energy, contact energy, total energy for the simulations.

• Internal energy increases linearly till the end of the cycle and since there was no deletion of elemts hence no change in the energy .
• kinetic energy is very small when compared to the internal energy
• Contact energy and hour glass energy is zero.

Case 5: To convert the material model to Law1 elastic with same density, E nu.

1. changing the card image to M1_ Elastic.

Rho=0.0028kkg/l, E=71000.00MPA, Nu=0.33

2. After changing the card image and now runing the simulation.

• From the above result the energy error 1.3% which is in the acceptable range
• The mass energy error is 0.

3. Since all the Errors are falling under acceptable range now runing contour simulation for Von mises stress.

• From the above simulation
• Maximum von mises stress=11020MPA
• Since the material is elastic there was no plastic deformation nor the elements had ruptured.

4. To Plot internal energy, hourglass energy, contact energy, total energy for the simulations.

• Internal energy increases linearly till the end of the cycle, the internal energy is high compared to other cases .
• kinetic energy is increased at the end of the cycle because of the larger stress delevoped .
• Contact energy and hour glass energy is zero.

Case6: To run the given model in the name of law27_000.rad and change the shell properties to the recommended property and also material card to johnson cook.

1. To import the given file into the GUI.

Import>import solver deck>selecting the 0000.rad file>import.

2. Now to open material card.

• Changed the property card to the belows values and no chamges have been made for the material property.

Parameters		Comment
Ishell =24		QEPH 4 nodes shells are best combination of cost and accuracy.
Ismstr=2		Full geometric nonlinearities (default)with possible small strain formulation activation in RADIOSS Engine.
Ish3n=2		Standard 3 noded shell (C0)with modification for large rotation(default)
N=5		Number of integration points set to 5 for accuracy bending.
Ithick=1		Thickness change is taken into account for accuracy.
Iplas=1		Iterative plasticity for good accuracy.

3. After changing the card image also property parameters and now runing the simulation.

• From the above result the energy error 0.8% which is in the acceptable range
• The mass energy error is 0.

3. Since all the Errors are falling under acceptable range now runing contour simulation for Von mises stress.

• From the above simulation
• Maximum von mises stress=327.9MPA
• Since the materials is elasto plastic, the materials and undergone larger deformation and ruptured and the elements are deleted.

4. To Plot internal energy, hourglass energy, contact energy, total energy for the simulations.

• Internal energy is increasing linearly till 4.2 ms and becomes almost becomes constant due to element deletion.
• Kinetic energy is reached to its peak at 4.2ms when the elements are deleted and the reduced.
• Contact energy and hourglass energy is zero.

Case7: To change the the Card Image to Law36_Plast_Tab.

1. changing the card image toLaw36_Plast_Tab.

Rho=0.0028kkg/l, E=71000.00MPA, Nu=0.33

2. Adding the curve using N-funtion attribute.

• Adding the valuse as per the test results a selecting the curve for the card image.

3. After changing the card image and selecting the curve and now runing the simulation.

• From the above result the energy error 1.2% which is in the acceptable range
• The mass energy error is 0.

3. Since all the Errors are falling under acceptable range now runing contour simulation for Von mises stress.

• From the above simulation
• Maximum von mises stress=1652MPA
• Here the elements are deleted no cracks are developed.

4. To Plot internal energy, hourglass energy, contact energy, total energy for the simulations.

• Internal energy is increasing linearly till the end of the cycle.
• Kinetic energy is flutauting and reached peak at 3.8ms.
• Contact energy and hourglass energy is zero.

RESULT:

Now to compare all the cases.

Cases	Total No cycles	Energy Errors	Von mises stress	Element Behaviors
Case1 (Law2_epsmax_failure )	49380	0.8%	316.3MPA	Elements are Deleted
Case2 (law2_epsmax_crack)	49217	4.1%	295.1MPA	Cracking of elements is seen and then the elements are deleted
Case3 (Law2_epsmax_nofail)	49408	0.8%	310.9MPA	Element Behaviors
Case4 (Law2, EPS_pmax)	49304	1.1%	325MPA	Elements are not deleted due to maximum EPS_pmax value.
Case5 (M1_ Elastic)	47969	1.3%	11020MPA	Elements are not deleted due elastic property
Case6 ( law27_ )	49508	0.8%	327.9MPA	Element Behaviors
Case7 (Law36_Plast_Tab )	52023	1.2%	1652MPA	Element Behaviors