Week - 8 Mass Scaling

Week - 8 Mass Scaling

Objective:-

To run a file using mass scaling reduce the running time of the model. And run the same file in implicit and explicit.

Procedure:-

To open the given .k file and run with LS-Dyna.

Check estimation time and mass.

Trial-1 given file run.

Estimated Time:- 8hrs 56 mins

Time Step Value:- 4.40E-05

added mass:- 0

Percentage increase:-0

DT2MS:- -3.50e-05

TSSFAC:-0.9

Trial-2

Estimated Time:- 2hrs 29 mins

Time Step Value:- 4.40E-05

added mass:- 1.3544e+8

Percentage increase:-4.7600e+2

DT2MS:- -2.50e-05

TSSFAC:-0.9

Trial-3

Estimated Time:- 3hrs 35 mins

Time Step Value:- 1.35E-04

added mass:- 3.2530e+07

Percentage increase:-1.1432e+02

DT2MS:- 1.5e-4

TSSFAC:-0.9

Trial-4

Estimated Time:- 7hrs 46 mins

Time Step Value:- 9.36-05

added mass:- 2.5256e+6

Percentage increase:-8.8759

DT2MS:- -1.04e-4

TSSFAC:-0.9

Trial-5

Estimated Time:- 5hrs 43mins

Time Step Value:- 9.27-05

added mass:- 2.2952e+6

Percentage increase:-8.066

DT2MS:- -1.03e-4

TSSFAC:-0.9

For that above table we tried DT2MS -1.03e-4 but estimated time 5hrs 43mins and
mass % increase 8.066%.

After the explicit analysis with mass scaling, implicit solver is enabled by using the following control cards

CONTROL_IMPLICIT_AUTO

CONTROL_IMPLICIT_GENERAL

CONTROL_IMPLICIT_SOLUTION

CONTROL_IMPLICIT_SOLVER

The run time is not given at start of simulation but at the end of termination and it is of 2 sec.