REPORT OF ASSIGNMENT 4

Objective:¶

• Run the model as it is. Name it as Law2_epsmax_failure.¶

• In FAIL/JOHNSON, change Ifail_sh=1, Dadv=1 & Ixfem=1. Run the model as Law2_epsmax_crack.¶

• Delete /Fail/JOHNSON card. Run the model as Law2_epsmax_nofail.¶

• Delete the value of Eps_p_max and the run the model with name Law2.¶

• Convert this material model into Law1 elastic with the same density, E, nu and run. Check the results.¶

• Open Law27_0000.rad.¶

• Check the shell properties and change it to recommended shell properties.¶

• Notice the material card. Johnson cook parameters but different values for EPS based failure.¶

• Run the model and name it as Law27¶

Compare 7 cases as discussed in last 3 slides, in a tabulated format on the basis of:¶

• The total number of cycles, Energy error, mass error and simulation time.¶

• Notice the animation of all 5 and describe the animations in brief on the⏎
  basis of whether the elements are being deleted or cracked.¶

• Plot energies and notice any difference.¶

• Based on all the results, which case would represent the on-field⏎
  scenario.¶

• Prepare a ppt/Docx and list down case by case result and your conclusion⏎
  as to why the failure happened.¶

Procedure:¶

Case-1:¶

• Open the Hypermesh software and select the profile as "RADIOSS".¶

• Import the FAILURE_JOHNSON_0000.rad File by using the "Import Solverdeck" option present in the File menu at the top left of the window.¶

• After importing the file, run the model as it is without changing the properties.¶

• Click on the Analysis panel and select the Radioss tool in it.¶

• In the Input file select a folder to save the file by clicking on the Save as option.¶

• Change the file name as Law2_epsmax_failure and save the file.¶

• In the options enter the value as -nt 4 and click on the Radioss button to run the model.¶

• Split the window into 2 layouts and open the HyperView in the 2nd window.¶

• Open the Law2_epsmax_failure.h3d file in the HyperView window and also check on the load results option in order to run the simulation.¶

• Split the windows into another layout and open HyperGraph to plot the results.¶

• Open the Law2_epsmax_failure T01 file in the HyperGraph window and plot the Total energy, Hourglass energy, Contact energy, Internal energy & Total resultant force for the model.¶

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CASE 1 ANIMATION FILE¶

Case-2:¶

• After completing the case 1 use the same file and proceed onto the next case. ¶

• Change the Ixfem, Dadv and Ifail_sh values to the recommended values in the Failure_johnson card and run the file.¶

• Click on the Analysis panel and select the Radioss tool in it. ¶

• In the Input file select a folder to save the file by clicking on the Save as option.¶

• Change the file name as Law2_epsmax_crack and save the file.¶

• In the options enter the value as -nt 4 and click on the Radioss button to run the model.¶

• Split the window into 2 layouts and open the HyperView in the 2nd window.¶

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Crack visualization¶

¶ CASE 2 ANIMATION FILE¶

Open the Law2_epsmax_crack.h3d file in the HyperView window and also check on the load results option in order to run the simulation.¶

• Split the windows into another layout and open HyperGraph to plot the results.¶

• Open the Law2_epsmax_crack T01 file in the HyperGraph window and plot the Total energy, Hourglass energy, Contact energy, Internal energy & Total resultant force for the model.¶

Case-3:¶

• Use the same file from case 2 to perform the case 3 analysis.¶

• Click on the Analysis panel and select the Radioss tool in it.¶

• In the Input file select a folder to save the file by clicking on the Save as option.¶

• Change the file name as Law2_epsmax_nofail and save the file.¶

• Delete the Failure_Johnson card in the solver browser and run the file.¶

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DELETING THE FAILURE JOHNSON CARD¶

• In the options enter the value as -nt 4 and click on the Radioss button to run the model.¶

• Split the window into 2 layouts and open the HyperView in the 2nd window.¶

• Open the Law2_epsmax_nofail.h3d file in the HyperView window and also check on the load results option in order to run the simulation.¶

• Split the windows into another layout and open HyperGraph to plot the results.¶

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CASE 3 ANIMATION FILE¶

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• Open the Law2_epspmax_nofail T01 file in the HyperGraph window and plot the Total energy, Hourglass energy, Contact energy, Internal energy & Total resultant force for the model.¶

Case-4:¶

• Use the same file from case 3 to perform the case 4 analysis.¶

• Click on the Analysis panel and select the Radioss tool in it.¶

• In the Input file select a folder to save the file by clicking on the Save as option. ¶

• Delete the Eps_P_max value and make it as 0 in the material card and then run the file. ¶

¶ CHANGE THE EPS_p_max VALUE TO ZERO¶

• Change the file name as Law2 and save the file.¶

• In the options enter the value as -nt 4 and click on the Radioss button to run the model.¶

• Split the window into 2 layouts and open the HyperView in the 2nd window.¶

• Open the Law2 .h3d file in the HyperView window and also check on the load results option in order to run the simulation.¶

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• Split the windows into another layout and open HyperGraph to plot the results.¶

• Open the Law2 T01 file in the HyperGraph window and plot the Total energy, Hourglass energy, Contact energy, Internal energy & Total resultant force for the model.¶

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CASE 4 ANIMATION FILE¶

Case-5:¶

• Use the same file from the case 4 to perform the case 5 analysis.¶

• In this case, change the material model to Law1 Elastic with the same Density, E, Nu in the material card and run.¶

¶ CHANGING THE MATERIAL MODEL IN THE MATERIAL CARD¶

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• Click on the Analysis panel and select the Radioss tool in it.¶

• In the Input file select a folder to save the file by clicking on the Save as option.¶

• Change the file name as Law1_Elastic and save the file.¶

• In the options enter the value as -nt 4 and click on the Radioss button to run the model.¶

• Split the window into 2 layouts and open the HyperView in the 2nd window.¶

• Open the Law1_Elastic.h3d file in the HyperView window and also check on the load results option in order to run the simulation.¶

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• Split the windows into another layout and open HyperGraph to plot the results.¶

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• Open the Law1_Elastic T01 file in the HyperGraph window and plot the Total energy, Hourglass energy, Contact energy, Internal energy & Total resultant force for the model.¶

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CASE 5 ANIMATION FILE¶

Case-6:¶

• Open the Hypermesh software and select the profile as "RADIOSS".¶

• Import the Law_27_0000.rad File by using the "Import Solverdeck" option present in the File menu at the top left of the window.¶

• After importing the file, notice the properties and change the properties to the recommended properties and assign the property to the component.¶

• After assigning the property, click on the Analysis panel and select the Radioss tool in it.¶

• In the Input file select a folder to save the file by clicking on the Save as option.¶

• Change the file name as the Law_27 and save the file.¶

• In the options enter the value as -nt 4 and click on the Radioss button to run the model. ¶

• Split the window into 2 layouts and open the HyperView in the 2nd window.¶

• Open the Law_27.h3d file in the HyperView window and also check on the Load results option in order to run the simulation.¶

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• Split the windows into another layout and open HyperGraph to plot the results.

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• Open the Law_27 T01 file in the HyperGraph window and plot the Total energy, Hourglass energy, Contact energy, Internal energy & Total resultant force for the model.¶

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CASE 6 ANIMATION FILE¶

Case-7:

• Open the Hypermesh software and select the profile as "RADIOSS".¶

• Import the Failure_Johnson File by using the "Import Solverdeck" option present in the File menu at the top left of the window.¶

• After importing the file, notice the properties and change the properties to the recommended properties and assign the property to the component.¶

• Create a New curve according to the recommended parameters and name it as Test curve in the model tab.¶

• After creating the curve change the material model to Law36 in the material card and enter the values given in the Plas_tab card wherever necessary and assign the material to the component.¶

ENTER THE VALUES GIVEN IN THE LAW36 PLAS_TAB CARD

• After assigning the property and material to the component, click on the Analysis panel and select the Radioss tool in it.In the Input file select a folder to save the file by clicking on the Save as option.¶

• Change the file name as the Law 36_Failure_Johnson and save the file.¶

• In the options enter the value as -nt 4 and click on the Radioss button to run the model.¶

• Split the window into 2 layouts and open the HyperView in the 2nd window.¶

• Open the Law_36 Failure_Johnson.h3d file in the HyperView window and also check on the Load results option in order to run the simulation.¶

• Split the windows into another layout and open HyperGraph to plot the results.¶

• Open the Law_36_Failure_Johnson T01 file in the HyperGraph window and plot the Total energy, Hourglass energy, Contact energy, Internal energy & Total resultant force for the model.¶

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CASE 7 ANIMATION FILE¶

Comparison of all the cases: ¶

.Out file data:¶

Cases Total no of cycles Energy error Mass error Simulation Time¶

1. Case-1 49380 + 0.8% 0.000 106.24s¶
2. Case-2 49217 + 4.1% 0.000 122.28s¶
3. Case-3 49408 + 0.8% 0.000 107.01s¶
4. Case-4 49304 + 1.1% 0.000 110.13s¶
5. Case-5 47968 + 0.3% 0.000 100.32s¶
6. Case-6 49508 +0.8 % 0.000 110.03s¶
7. Case-7 49010 -1.5% 0.000 104.49s¶

Animation Comparison:¶

• Case 1:The elements get deleted during the simulation.¶

• Case 2: After changing the values in the Failure Jhonson card in case 2 the elements also get Deleted during the simulation,but the cracks are visible ¶

• Case 3: After deleting the Failure Jhonson card in case 3 the elements get Deleted during the simulation.This happens due to the stress and strain max limit¶

• Case 4: After deleting the Eps max value in the Material card in case 4 there is No rupture during the simulation.¶

• Case 5: After changing the material model to Law 1 Elastic with the same values in E, Nu & Density etc. There is No rupture taking place because of the elastic behaviour during the simulation.¶

• Case 6: In this case, the Law 27 file is used. The elements get Deleted during the simulation.¶

• Case 7: In this case, the Law 36 file is used. In this, the elements get Ruptured during the simulation.¶

Graph Comparison:¶

• The Hourglass energy and Contact energy have remained the same for all the cases.¶

• The Hourglass energy varies in the case of Law_27 file but the Contact energy remains the same.¶

• There is a steady increase in the Total energy & Internal energy at the start of the simulation and it stabilises just before the end for the first 3 Cases (i.e., Case 1, 2 & 3).¶

• There is a stable increase in the Total energy & Internal energy right from the start of the simulation and to the end for case 4, case 5, case 6 & case 7.¶

Conclusion:¶

After looking at all the cases we can conclude that M36_PLAS_TAB /LAW36 represents the most real-life l scenario where the experimental or Lab data can be used in the simulation which is case 7. Other than that case 2 with M2_PLAS_JOHN/LAW2 material card and failure johnson model card demonstrate very relevant information about the failure of the plate(crack and delete). The LAW 27 /M27_PLAS_BRITT is mostly used for brittle material(glass).

Link for report:
https://docs.google.com/document/d/1ozBeFCHx2OvyT_UDaKJlT2dPmSG65zMpjWI880tnapk/edit?usp=sharing