Assignment 3-2D Element Formulation Challenge

Assignment 3 - 2D Element Formulation Challenge

AIM

Comparison of results with base simulation and improved shell element properties

1.Using the crash beam file from the previous assignment, change the run time to 55 ms.

2. Change the number of animation steps during simulation to a minimum of 25 and maximum of 60.

3. Run the base simulation without any modification to element properties.

4. At the end of the simulation, do the energy error and mass error checks and determine whether results would be acceptable.

5. If acceptable, Plot rigid wall forces, internal energy, hourglass energy, contact energy, total energy of the simulations.

6. Change all the shell elements properties to recommended properties, save this as separate, rad files and run the simulation.

7. Follow steps 5 and 6.

8. Create a brief report comparing all the results from steps 5 and 6 for both simulations.

9. Comment whether there is any change in the results and why there is any change in the result.

PROCEDURE

• to insert the starter file in the working place
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• we have to change the run time to 55 ms
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• now we have to Change the number of animation steps during simulation to a minimum of 25 and maximum of 60.
• we choose 50 so it will start from 5 only
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• after enroll the details run the simulation
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• after completing the simulation we have pop up box like this we have to give the result option
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• when we click the results button it will move to the this page
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• now we have to plot the graphs
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• and now we move to the case 2

• 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.

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• now this time we have a different kind of graphical approaches are there
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• CONCLUSION
• RIGID WALL
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• CONTACT ENERGY
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• HOURGLASS ENERGY
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• TOTAL ENERGY
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• WHEN WE COMPARED TO THE TWO CASES
• THERE IS NO HOURGLASS EFFECT IN CASE 2 BECAUSE IN CASE 2 WE USE Ishell = 24 QEPH
• IN CONTACT ENERGY IN CASE2 AFTER 40 ms THE GRAPH REACH ALL TIME HIGH BEACUSE OF THE PARAMETERS
• I_shell =24
• I_smstr=2
• I_sh3n=2
• N=5
• I_thick=1
• I_plas=1