Comparision of simulation results of the base setup and improved shell element properties using Hypermesh Hyperview and Hypergraph

Objective:

To compare the simulation results of the base setup and improved shell element properties.

Case set up and Execution:

Case 1:

1. Open the \"Element_Formulation_Shell-3_assignment_0001.rad\" file using TextPad software to edit the values.

2. Change the runtime from 60 ms to 55 ms.

• The runtime value can also be changed by opening Hypermesh-import solver desk-select  \"Element_Formulation_Shell-3_assignment_0000.rad\" file-import-solvers-ENGINE_KEYWORDS-RUN and change the Tstop value to 55 ms.

3. Now open the RADIOSS 2018 software, select the \"Element_Formulation_Shell-3_assignment_0000.rad\" file and click on Run.

• Now we will get 25-60 animation step files.

4. Now open the \"Element_Formulation_Shell-3_assignment_0001.out\" file to check whether the energy and mass error are less than 15%.

• Now open Hyperview and select \"Element_Formulation_Shell-3_assignment.h3d\" file.
• Select contour-von mises-simple method and click apply.

5. Now select multi-window and open Hypergraph to plot the graphs and save the file as template as initial.tpl file.

Case 2:

6. Now change the current property values to the given property values and save in different folder or with different file name.

• Open Hypermesh and change the properties.

7. Now repeat steps 3-5 mentioned above in Case 1.

• After the property values are changed, we run the new \"Element_Formulation_Shell-3_assignment_0000.rad\" file to get the animation steps.
• Next check for the energy and mass error.

• Now open Hyperview and select new changed properties \"Element_Formulation_Shell-3_assignment.h3d\" file.
• Select contour-von mises-simple method and click apply.

• Now select multi-window and open Hypergraph to plot the graphs and save the file as template as final.tpl file, or
• We can use the initial.tpl file which was saved earlier to get the graphs. Open Hyperview-File-Open-Templete-select initial.tpl file-click open. Now for Graphic and Result file select the new \"Element_Formulation_Shell-3_assignment.h3d\" file and select \"Element_Formulation_Shell-3_assignmentT01\" file for plot file and click on apply. 
• We will get the graphs similar to base graphs but with new property values.

8 & 9. Comparision:

• The energy error in case 1 is -10.3% which is more than the energy error in case 2 which is -0.1% whereas mass error in both the cases is same.
• In the contour plot, we can see that the node at which max von-mises stress occurred has changed from node 706 in case 1 to node 708 in case 2.
• The internal energy in case 1 is more linear than case 2.
• The kinetic energy is not zero because of energy error but if we increase the runtime more than 55 ms then KE may become zero.
• There is contact energy in both cases but it was captured better in case 2.
• The total energy is more linear in case 1 when compared with case 2.
• In the rigid wall force graph, we can see that initially the force was high but decreased gradually as the frictional force started.

Result and Conclusion:

• As mentioned above we have compared all the results that are obtained from the simulation of given files.
• To get effective deformations and stresses we have changed the property values as recommended of the shell elements using QEPH ISHELL 24 with inbuilt hourglass stabilization.

Thus, all the points mentioned in objective are successfully carried out using Hypermesh, Hyperview, and Hypergraph.