Assignment 3

1: Run time is taken as 55ms and the simulation is made to run.

2:No. of animation steps are taken as 25 by using this the time frequency is calculated with formula

Time freq=Total run time/no. of animation steps

Time freq=2.2ms

3: Default shell element properties are considered while running tis base simulation.

4: After the simulation was made to run the energy errors and mass error as per the below described from starting to ending of the simulation

ERROR I-ENERGY K-ENERGY T K-ENERGY R EXT-WORK MAS.ERR

0.0% 0.000 0.6131E+08 0.000 0.000 0.1659E-03

-10.3% 0.1935E+08 0.3562E+08 0.1892E+05 -3984. 0.1659E-03

Below` is the ref of the internal and kinetic energy curve plotted with respect to time.

5: The above 4&5 images are the ref for the plotting of the rigid wall force resultant forces energy internal energy.

6.

These the shell element properties that the considered for running the other simulation of case: 2

The above is the ref. for the case: 2 simulation were von mises forces are also apllied.

7, 8: The above is the attachment having the differences observed in the both the cases.

9: 4 node shell element formulation flag.

= 0

Use value in /DEF_SHELL.

= 1 Default, if /DEF_SHELL is not defined

Q4, visco-elastic hourglass modes orthogonal to deformation and rigid modes (Belytschko)

= 2

Q4, visco-elastic hourglass without orthogonality (Hallquist).

So the change in shell elements previously is:

Q4-it has more integration points.

QEPH-it has one integration point.

So these difference is the thing that it is caused several variations in energy error mass error etc. as described.

NOTE:The simulation of case 1 and the images of the forces are attached in the link.

https://1drv.ms/u/s!Av1WlNmjfvAwgxXHYf_Nrps7Js5T?e=SQuUD1