FRF for a column model with a hole (solid elements) — Welcome to LS-DYNA Examples

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This example shows a column with a hole using solid elements. *FREQUENCY_DOMAIN_FRF is used to define x-acceleration excitation to the base. Response at different output nodes can be studied. Example 4.3 from LS-Dyna training class NVH, Fatigue and Frequency Domain Analysis with LS-DYNA by Yun Huang.

Keywords

*BOUNDARY_SPC_SET
*CONTROL_ENERGY
*CONTROL_IMPLICIT_EIGENVALUE
*CONTROL_IMPLICIT_GENERAL
*CONTROL_IMPLICIT_NONLINEAR
*CONTROL_OUTPUT
*CONTROL_TERMINATION
*DATABASE_BINARY_D3PLOT
*DATABASE_GLSTAT
*DATABASE_MATSUM
*ELEMENT_SOLID
*END
*FREQUENCY_DOMAIN_FRF
*KEYWORD  
*MAT_PIECEWISE_LINEAR_PLASTICITY
*NODE
*PART
*SECTION_SOLID
*SET_NODE_LIST
*TITLE

Reduced Input

*KEYWORD  
*TITLE
A column with a hole
*FREQUENCY_DOMAIN_FRF
                             1         1         0       20. 
      0.01
       200         1         1         1
      0.01      10.       1000
*CONTROL_IMPLICIT_EIGENVALUE
       100     0.000         0     0.000         0     0.000         2     0.000
         0         0         0         0
*CONTROL_IMPLICIT_GENERAL
         1  1.000000         2         0         2         0         0         0
*CONTROL_IMPLICIT_NONLINEAR
         1         0         0     0.000     0.000     0.000     0.000     0.000
         2         1         0         2
         0         0     0.000         1         2
*CONTROL_ENERGY
         2         2         0         0
*CONTROL_OUTPUT
         1         3         0         0     0.000         0         0         0
         0         0         2        50         0
*CONTROL_TERMINATION
  1.000000         0     0.000     0.000     0.000
*DATABASE_GLSTAT
  0.100000         0         0         1
*DATABASE_MATSUM
  0.100000         0         0         1
*DATABASE_BINARY_D3PLOT
  0.100000         0         0         0         0
         0
*SET_NODE_LIST
       100
       163       166       169       172       175       178       181       184
       187       307       310       313       316       319       322       391
       394       397       400       403       406       493       496       499
       589       592       645       648 
*SET_NODE_LIST
       200
       290       292       294       296       298       300       302       304
       306       380       382       384       386       388       390       482
       484       486       488       490       492       578       580       582
       638       640       706       708         0         0         0         0
*BOUNDARY_SPC_SET
       100         0         1         1         1         1         1         1
*PART
lower_post
         4         2         2         0         0         0         0         0
*SECTION_SOLID
         2        18         0
*MAT_PIECEWISE_LINEAR_PLASTICITY
         2 4.9900E-7 11.370000  0.320000  0.046800     0.000  0.110000     0.000
     0.000     0.000         0         0     0.000
     0.000  0.250000     0.000     0.000     0.000     0.000     0.000     0.000
  0.046800  0.047000     0.000     0.000     0.000     0.000     0.000     0.000
*PART
upper_post 
         5         2         3         0         0         0         0         0
*MAT_PIECEWISE_LINEAR_PLASTICITY
         3 4.9900E-7 110.37000  0.320000  0.046800     0.000  0.250000     0.000
     0.000     0.000         0         0     0.000
     0.000  0.250000     0.000     0.000     0.000     0.000     0.000     0.000
  0.046800  0.047000     0.000     0.000     0.000     0.000     0.000     0.000
*ELEMENT_SOLID
*NODE
*END

Figures

image03.png

image04.png

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