Transient loading of a L-beam with contact

This example is very similar to the one of Section 4.6.1, but a fully constrained, rigid transverse support (green in Figure 31) is added. Loads and boundary conditions are the same as in Section 4.6.1. A contact condition is defined between the support and the beam using *CONTACT_AUTOMATIC_SURFACE_TO_SURFACE_MORTAR. A frequency-independent (for the range 50 – 300 Hz) damping of 3 % of critical is applied using *DAMPING_FREQUENCY_RANGE. Moderate numerical damping is also applied by using GAMMA = 0.55 and BETA = 0.27563. The transient displacement response of the loaded node is shown in Figure 32. The response is quite chaotic at the beginning, but decays quickly due to the combined effect of the damping definitions.

The example keyword file is transient_nonlin001.key.

Example Files: transient_nonlin001
NOTE! All examples are included in the Complete Guideline

Main Input

*KEYWORD
$===============================================================================
$ database cards
$===============================================================================
*INCLUDE
../INCLUDE_FILES/database_cards_dynamic.key
*DATABASE_BINARY_D3PLOT
        2.
*DATABASE_HISTORY_NODE_SET
         5
*DATABASE_NODOUT
        .1  
$===============================================================================
$ Control cards
$===============================================================================
*INCLUDE
../INCLUDE_FILES/control_cards_nonlin.key
*DEFINE_CURVE_TITLE
Implicit timesteps
       700
0.,.4
1000.,.4
*CONTROL_TERMINATION
     1000.
*DAMPING_FREQUENCY_RANGE
     3.E-2    50.E-3   300.E-3
*CONTROL_IMPLICIT_DYNAMICS
         1      0.55   0.27563
$===============================================================================
$ Geometry
$===============================================================================
*INCLUDE
beam001.key
*INCLUDE
support001.key
$===============================================================================
$ Contact
$===============================================================================
*CONTACT_AUTOMATIC_SURFACE_TO_SURFACE_MORTAR_ID
       131Stopper contact
         1         3         3         3
       0.1


$===============================================================================
$ Loads and boundary conditions
$===============================================================================
*BOUNDARY_SPC_SET
         1                   1         1         1         1         1         1
*LOAD_NODE_SET
         5         2       100       0.5
*DEFINE_CURVE_TITLE
Loading_curve
100,
0.,0.
20.,1.
20.1,0.
200,0.
$===============================================================================
$ Simulation tilte
$===============================================================================
*TITLE
Transient non-linear implicit dynamics example with contact
*END