The data file for this exercise is located in directory: mech_001\Exercises\Case1F\Data. Look for ! TODO  text in the datafile and follow the instructions.

 

This case considers the response when the surface load is applied as an instantaneous load; i.e. a drop load due to impact.   Two cases are considered:

 

1Case 1F1 - Without Damping.

2Case 1F2 - With 2% percentage damping for the complete domain.

 

As the simulation is for illustrative purposes only the time scaling, and therefore the natural frequency, is the same as Case 1E, although strictly time scaling cannot be used in true dynamic simulations.

 

 

 

 

The solutions show that, as expected the vertical stress oscillates between zero and twice the quasi-static load of 10 MPa for the case with no damping (note that the gradiual reduction in magnitude is due to the low levels of high frequency damping that is applied by default).  When 2% percentage damping is applied, however, the oscillations almost die out by t = 2.0.

 

 

The results are visualized by plotting the high definition history data for global energy and points output in files mech_001_2d_Case1f1_001.hdh and mech_001_2d_Case1f2_001.hdh respectively.