Triple pendulum

- February 23, 2023 at 10:10 am
  
  amir.mb1377
  Subscriber
  
  Hello. How i should considering 3 series elements for mat-197 in ls dyna software??
- February 23, 2023 at 4:30 pm
  
  Andreas Koutras
  Ansys Employee
  
  Here are some sample keywords that may help.
  
  $ ====================
  $ MAT (Material) cards
  $ ====================
  $
  *MAT_SEISMIC_ISOLATOR
  $ sliding isolator
  1 2000.0 0.0 0.0 0.0 0.005 1.e8 0
  1.0e5
  0.2 0.10 0.5 0.150
  
  $
  *MAT_SEISMIC_ISOLATOR
  $ elastomeric isolator
  2 2000.0 0.0 0.0 0.0 0.005 1.e8 1
  1.0e5
  0.0 0.0 0.0 0.0 0.0 0.0
  30.e3 0.05 0.150
  *MAT_SEISMIC_ISOLATOR
  $ sliding isolator with radii
  10 2000.0 0.0 0.0 0.0 0.005 1.e8 2
  -1.0e5
  0.2 0.10 0.5 0.5 0.5 0.50 1.e5
  0.1 0.40 0.30
  $
  $
  $
  $ =============
  $ SECTION cards
  $ =============
  $
  *SECTION_BEAM
  1 6 0.0 0.0 0.0 0.0
  $ vol iner cid ca offset rrcon srcon trcon
  0.125 10.0 0 0.0 0.0 0.0 0.0 0.0
  $
  2 6 0.0 0.0 0.0 0.0
  $ vol iner cid ca offset rrcon srcon trcon
  0.125 10.0 0 0.0 0.0 0.0 0.0 0.0
  $
  $
  $
  $ ==========
  $ PART cards
  $ ==========
  $
  *PART
  sliding isolator
  1 1 10 0 0 0 0 0
  $
  *PART
  sliding isolator
  2 2 2 0 0 0 0 0
  *PART
  sliding isolator with radii
  10 1 10 0 0 0 0 0
  $
  $
  $
  $ ==========
  $ NODE cards
  $ ==========
  $
  *NODE
  1 0.0 0.0 0.0 0 0
  2 0.0 0.0 0.0 0 0
  3 0.24974091 0.0 0.0 0 0
  4 0.24974091 0.0 0.0 0 0
  13 0.5 0.0 0.0 0 0
  14 0.5 0.0 0.0 0 0
  $
  $
  $ =============
  $ ELEMENT cards
  $ =============
  $
  *ELEMENT_BEAM
  1 1 1 2 0
  2 2 3 4 0
  10 10 13 14 0
  $
  $
  $ ==============
  $ BOUNDARY cards
  $ ==============
  $
  *BOUNDARY_PRESCRIBED_MOTION_NODE
  2 1 0 1 2.0 0 0.0 0.0
  $ 2 2 0 2 2.0 0 0.0 0.0
  4 1 0 1 2.0 0 0.0 0.0
  $ 4 2 0 2 2.0 0 0.0 0.0
  $ 14 1 0 1 2.0 0 0.0 0.0
  14 2 0 1 2.0 0 0.0 0.0
  *BOUNDARY_SPC_NODE
  1 0 1 1 1 0 0 0
  3 0 1 1 1 0 0 0
  13 0 1 1 1 0 0 0
- February 24, 2023 at 2:49 pm
  
  amir.mb1377
  Subscriber
  
  Hello. You don't have the image of the isolator modeled in ls dyna. And that you don't have the file of these samples that you sent?
- February 24, 2023 at 7:55 pm
  
  Andreas Koutras
  Ansys Employee
  
  Hello, the model consists of three zero-length elform 6 discrete beams. You should be able to reproduce it using the keywords above. Unfortunately, we cannot share file through the forum. Here are pictures from the model in LSPP:
- February 24, 2023 at 8:16 pm
  
  amir.mb1377
  Subscriber
  
  Hello. The model consists of 3 beam elements with zero length. What does the distance between 3 and the element depend on? Should the mesh be added to the elements?