Assignment 3-2D Element Formulation Challenge

Live Session

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

Old file without change

Run time = 55ms

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

Let's take animation steps = 55

So the time frequency = `55/55 = 1`

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

The base simulation property card is

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

The energy and mass errors are given in the below image

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.

% energy error = -3.8% Acceptable (acceptable range 5 to -15%)

% mass error = 0.01659 % Not Acceptable (acceptable range is 3 to 3%)

7. Follow steps 5 and 6.

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

• There is a change is element formulation in the later simulation file which is Ishell, Ismstr, Ish3n properties. Which changed the elemental behaviour in the simulation and reduced the hourglass energy.

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

• In the second we assigned the element formulation and strain rate which increased the efficiency of the solver and also created less unstabilised elements while running the simulation.