Virtual elements

About the development of the FEM module/workbench.

Moderator: bernd

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Pauvres_honteux
Posts: 259
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Re: Virtual elements

Post by Pauvres_honteux » Wed Jan 08, 2020 7:09 pm

See if you can get anything out of this:
Virtual_element_types.pdf
(55.6 KiB) Downloaded 11 times
Last edited by Pauvres_honteux on Thu Jan 09, 2020 7:21 pm, edited 1 time in total.
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Pauvres_honteux
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Re: Virtual elements

Post by Pauvres_honteux » Wed Jan 08, 2020 7:22 pm

I do not think there are a lot of virtual element types.
Probably there are A LOT of different ways of configuring them / assign properties/behavior.
Maybe some automation is in order here? Or not. I don't know... :oops:
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bernd
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Re: Virtual elements

Post by bernd » Thu Jan 09, 2020 9:29 am

On what are Virtual elements defined in ccx input file. Nodes or elements? An simple example or an input file would be great.
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Pauvres_honteux
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Re: Virtual elements

Post by Pauvres_honteux » Thu Jan 09, 2020 7:17 pm

I've never opened an input file for a FEM program so I have no idea what to look for in the first place. Even less so, manipulating one.
However, I have searched on DHondt's site and Calculix homepages but came up with absolutely nothing.
.
If anyone in this forum have an account on any of these sites perhaps he (or she) could ask the authors of Calculix how to set up a virtual element in Calculix and paste the resulting input file here?
.
I'll keep on searching the net though. And ask the pro's at work if they have any suggestions.
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bernd
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Re: Virtual elements

Post by bernd » Thu Jan 09, 2020 8:10 pm

UR_
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Re: Virtual elements

Post by UR_ » Thu Jan 09, 2020 8:27 pm

Please see:

http://www.dhondt.de/ccx_2.16.pdf page 521: *RIGID BODY

Example:
*RIGID BODY,NSET=rigid1,REF NODE=100,ROT NODE=101
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bernd
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Re: Virtual elements

Post by bernd » Thu Jan 09, 2020 9:12 pm

and example file would be beamrb.inp

das sollten wir versuchen nachzubauen ...

Code: Select all

**
**   Structure: cantilever beam.
**   Test objective: rigid body option (rotation)
**
*HEADING
Model: beam     Date: 10-Mar-1998
*NODE
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    62,      0.000000,      0.000000,      0.500000
    63,      1.000000,      1.000000,      0.500000
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    65,      1.000000,      1.000000,      1.500000
    66,      1.000000,      1.000000,      2.000000
    67,      1.000000,      1.000000,      2.500000
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    73,      1.000000,      1.000000,      5.500000
    74,      1.000000,      1.000000,      6.000000
    75,      1.000000,      1.000000,      6.500000
    76,      1.000000,      1.000000,      7.000000
    77,      1.000000,      1.000000,      7.500000
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   101,      0.750000,      0.500000,      8.000000
   102,      0.500000,      0.750000,      8.000000
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   105,      0.500000,      0.000000,      1.000000
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   126,      0.750000,      0.000000,      6.000000
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   128,      0.250000,      0.000000,      7.000000
   129,      0.500000,      0.000000,      7.000000
   130,      0.750000,      0.000000,      7.000000
   131,      0.500000,      0.000000,      7.500000
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   135,      1.000000,      0.750000,      1.000000
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   139,      1.000000,      0.750000,      2.000000
   140,      1.000000,      0.500000,      2.500000
   141,      1.000000,      0.250000,      3.000000
   142,      1.000000,      0.500000,      3.000000
   143,      1.000000,      0.750000,      3.000000
   144,      1.000000,      0.500000,      3.500000
   145,      1.000000,      0.250000,      4.000000
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   147,      1.000000,      0.750000,      4.000000
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   168,      0.250000,      1.000000,      2.000000
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   180,      0.250000,      1.000000,      5.000000
   181,      0.500000,      1.000000,      5.500000
   182,      0.750000,      1.000000,      6.000000
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   184,      0.250000,      1.000000,      6.000000
   185,      0.500000,      1.000000,      6.500000
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   223,      0.750000,      0.500000,      1.000000
   224,      0.500000,      0.750000,      1.000000
   225,      0.500000,      0.500000,      1.500000
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   231,      0.500000,      0.500000,      2.500000
   232,      0.500000,      0.250000,      3.000000
   233,      0.250000,      0.500000,      3.000000
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   235,      0.750000,      0.500000,      3.000000
   236,      0.500000,      0.750000,      3.000000
   237,      0.500000,      0.500000,      3.500000
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   242,      0.500000,      0.750000,      4.000000
   243,      0.500000,      0.500000,      4.500000
   244,      0.500000,      0.250000,      5.000000
   245,      0.250000,      0.500000,      5.000000
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   247,      0.750000,      0.500000,      5.000000
   248,      0.500000,      0.750000,      5.000000
   249,      0.500000,      0.500000,      5.500000
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   253,      0.750000,      0.500000,      6.000000
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   255,      0.500000,      0.500000,      6.500000
   256,      0.500000,      0.250000,      7.000000
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   259,      0.750000,      0.500000,      7.000000
   260,      0.500000,      0.750000,      7.000000
   261,      0.500000,      0.500000,      7.500000
262,0.,0.,0.
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*ELEMENT, TYPE=C3D20R   , ELSET=B1
     1,     1,    10,    95,    19,    61,   105,   222,   192,     9,    93,
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     2,    10,     2,    13,    95,   105,    34,   134,   222,    11,    12,
           96,    93,   106,   133,   223,   220,   103,    33,   132,   219
     3,    19,    95,    16,     4,   192,   222,   163,    79,    94,    97,
           17,    18,   221,   224,   164,   191,   190,   219,   161,    78
     4,    95,    13,     3,    16,   222,   134,    64,   163,    96,    14,
           15,    97,   223,   135,   162,   224,   219,   132,    63,   161
     5,    61,   105,   222,   192,    59,   109,   228,   196,   104,   220,
          221,   193,   108,   226,   227,   197,    60,   107,   225,   194
     6,   105,    34,   134,   222,   109,    36,   138,   228,   106,   133,
          223,   220,   110,   137,   229,   226,   107,    35,   136,   225
     7,   192,   222,   163,    79,   196,   228,   167,    81,   221,   224,
          164,   191,   227,   230,   168,   195,   194,   225,   165,    80
     8,   222,   134,    64,   163,   228,   138,    66,   167,   223,   135,
          162,   224,   229,   139,   166,   230,   225,   136,    65,   165
     9,    59,   109,   228,   196,    57,   113,   234,   200,   108,   226,
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    10,   109,    36,   138,   228,   113,    38,   142,   234,   110,   137,
          229,   226,   114,   141,   235,   232,   111,    37,   140,   231
    11,   196,   228,   167,    81,   200,   234,   171,    83,   227,   230,
          168,   195,   233,   236,   172,   199,   198,   231,   169,    82
    12,   228,   138,    66,   167,   234,   142,    68,   171,   229,   139,
          166,   230,   235,   143,   170,   236,   231,   140,    67,   169
    13,    57,   113,   234,   200,    55,   117,   240,   204,   112,   232,
          233,   201,   116,   238,   239,   205,    56,   115,   237,   202
    14,   113,    38,   142,   234,   117,    40,   146,   240,   114,   141,
          235,   232,   118,   145,   241,   238,   115,    39,   144,   237
    15,   200,   234,   171,    83,   204,   240,   175,    85,   233,   236,
          172,   199,   239,   242,   176,   203,   202,   237,   173,    84
    16,   234,   142,    68,   171,   240,   146,    70,   175,   235,   143,
          170,   236,   241,   147,   174,   242,   237,   144,    69,   173
    17,    55,   117,   240,   204,    53,   121,   246,   208,   116,   238,
          239,   205,   120,   244,   245,   209,    54,   119,   243,   206
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    19,   204,   240,   175,    85,   208,   246,   179,    87,   239,   242,
          176,   203,   245,   248,   180,   207,   206,   243,   177,    86
    20,   240,   146,    70,   175,   246,   150,    72,   179,   241,   147,
          174,   242,   247,   151,   178,   248,   243,   148,    71,   177
    21,    53,   121,   246,   208,    51,   125,   252,   212,   120,   244,
          245,   209,   124,   250,   251,   213,    52,   123,   249,   210
    22,   121,    42,   150,   246,   125,    44,   154,   252,   122,   149,
          247,   244,   126,   153,   253,   250,   123,    43,   152,   249
    23,   208,   246,   179,    87,   212,   252,   183,    89,   245,   248,
          180,   207,   251,   254,   184,   211,   210,   249,   181,    88
    24,   246,   150,    72,   179,   252,   154,    74,   183,   247,   151,
          178,   248,   253,   155,   182,   254,   249,   152,    73,   181
    25,    51,   125,   252,   212,    49,   129,   258,   216,   124,   250,
          251,   213,   128,   256,   257,   217,    50,   127,   255,   214
    26,   125,    44,   154,   252,   129,    46,   158,   258,   126,   153,
          253,   250,   130,   157,   259,   256,   127,    45,   156,   255
    27,   212,   252,   183,    89,   216,   258,   187,    91,   251,   254,
          184,   211,   257,   260,   188,   215,   214,   255,   185,    90
    28,   252,   154,    74,   183,   258,   158,    76,   187,   253,   155,
          182,   254,   259,   159,   186,   260,   255,   156,    75,   185
    29,    49,   129,   258,   216,     5,    22,   100,    31,   128,   256,
          257,   217,    21,    98,    99,    32,    48,   131,   261,   218
    30,   129,    46,   158,   258,    22,     6,    25,   100,   130,   157,
          259,   256,    23,    24,   101,    98,   131,    47,   160,   261
    31,   216,   258,   187,    91,    31,   100,    28,     8,   257,   260,
          188,   215,    99,   102,    29,    30,   218,   261,   189,    92
    32,   258,   158,    76,   187,   100,    25,     7,    28,   259,   159,
          186,   260,   101,    26,    27,   102,   261,   160,    77,   189
*NSET, NSET=CN7
    97,    96,    95,    94,    93,    20,    19,    18,    17,    16,    15,
    14,    13,    12,    11,    10,     9,     4,     3,     2,     1
*BOUNDARY
CN7,1,3
*ELSET,ELSET=EALL,GENERATE
1,32
*NSET,NSET=NALL,GENERATE
1,263
*MATERIAL,NAME=EL
*ELASTIC
210000.,.3
*SOLID SECTION,ELSET=EALL,MATERIAL=EL
*NSET,NSET=Ntip 
5, 
6, 
7, 
8, 
21, 
22, 
23, 
24, 
25, 
26, 
27, 
28, 
29, 
30, 
31, 
32, 
98, 
99, 
100, 
101, 
102,
*RIGID BODY,NSET=Ntip,REF NODE=263,ROT NODE=262
*STEP,NLGEOM,INC=100
*STATIC
1.,1.
*BOUNDARY
262,3,3,0.1745
*NODE PRINT,NSET=NALL
U,RF
*EL PRINT,ELSET=EALL
S
*END STEP
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bernd
Posts: 8959
Joined: Sun Sep 08, 2013 8:07 pm
Location: Zürich, Switzerland

Re: Virtual elements

Post by bernd » Fri Jan 10, 2020 6:50 am

beamrb and beamrb2
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