how to get electric output from piezoelectric analysis?

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how to get electric output from piezoelectric analysis?

pumpkinwiz1
to put it straight forward, I am trying to extract any potential charges/voltages from applied forces in a piezoelectric material.  it is a very simple 3 point bending situation, and have defined the material constants, but output involving electricity (current, potential gradient, reactionary charge, etc) doesn't show anything.  Looking at examples don't help.

It seems that abaqus is just set to see output when there is charge-based boundary condition involved.  Any advice will be helpful.  Thanks.
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Re: how to get electric output from piezoelectric analysis?

Raviteja.P
This post was updated on .
Hi pupmpkinwiz,

Did you give Stress/Strain Coefficients (coupling matrix),,.. in material properties?
In piezo electric analysis this defines the relation between electrical and mechanical relationship for the material.,
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Re: how to get electric output from piezoelectric analysis?

pumpkinwiz1
Thanks for your response.  I have set all the material constants involving piezoelectricity.  I have also done numerous static tests in abaqus before.  I have a feeling that I am doing something wrong or not setting something up in the boundary condition cases.  As stated before, I am just applying a load and expecting electrical output.  I do set the electrical boundary condition at the initial step.  Do i need to set specific outputs?  Any help will be awesome. tia.

 

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Re: how to get electric output from piezoelectric analysis?

pumpkinwiz1
In reply to this post by Raviteja.P
i replied through the yahoo list, but just in case it won't show- I actually did defined all of the coefficients and teh matrix in the material properties.  

I have done many static and dynamic tests in abaqus- it seems that for piezoelectric analysis I am missing something.  I also set electrical boundary conditions in both the initial and the push down step by asssigning it to 0.  

Am i missing something?  Do i need to define some nodal conditions or surface conditions?  Do i need to have it generate some output?  any more information will be greatly helpful!

sam
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Re: how to get electric output from piezoelectric analysis?

ashokkumar.d
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can u provide the input file (.inp) of your problem,so that by checking all the parameters we will be able to find the missing data in the analysis.

with regards
Ashok
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Re: how to get electric output from piezoelectric analysis?

pumpkinwiz1
Again, thanks.  here is a copy of the inp file (from text form).

To describe- my test model here is a very simple static test of pzt material.  i "clamped" one side, and applied tensile load to the other.  I have told the system to display all field outputs involving electrical.  (I couldn't do history output request, because it gave an error, saying ECD1-3 didn't exist).  I gave the electrical boundary condition on the entire material on the initial and the bending step.  

At this point, I dont' know how to see the electrical output from my model. Looking at the dropdown menu in the results options doesn't reveal any variables involving electric output.

any help or questions will be greatly appreciated. thanks!
-------------------------------------
*Heading
** Job name: Job-6 Model name: Model-1
** Generated by: Abaqus/CAE 6.11-2
*Preprint, echo=NO, model=NO, history=NO, contact=NO
**
** PARTS
**
*Part, name=pzttest
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    259,  0.075000003,  0.150000006, 0.0500000007
    260,  0.100000001,  0.175000012, 0.0500000007
    261,  0.100000001,  0.200000003,  0.075000003
    262,  0.075000003,  0.200000003, 0.0500000007
    263,  0.100000001,  0.224999994, 0.0500000007
    264,  0.100000001,         0.25,  0.075000003
    265,  0.075000003,         0.25, 0.0500000007
    266,  0.100000001,           0., 0.0250000004
    267,  0.100000001, 0.0250000004,           0.
    268,  0.100000001, 0.0500000007, 0.0250000004
    269,  0.075000003, 0.0500000007,           0.
    270,  0.075000003,           0.,           0.
    271,  0.100000001,  0.075000003,           0.
    272,  0.100000001,  0.100000001, 0.0250000004
    273,  0.075000003,  0.100000001,           0.
    274,  0.100000001,        0.125,           0.
    275,  0.100000001,  0.150000006, 0.0250000004
    276,  0.075000003,  0.150000006,           0.
    277,  0.100000001,  0.175000012,           0.
    278,  0.100000001,  0.200000003, 0.0250000004
    279,  0.075000003,  0.200000003,           0.
    280,  0.100000001,  0.224999994,           0.
    281,  0.100000001,         0.25, 0.0250000004
    282,  0.075000003,         0.25,           0.
    283,  0.150000006,           0.,        0.125
    284,  0.150000006, 0.0250000004,  0.100000001
    285,  0.150000006, 0.0500000007,        0.125
    286,  0.150000006, 0.0250000004,  0.150000006
    287,        0.125, 0.0500000007,  0.150000006
    288,        0.125,           0.,  0.150000006
    289,        0.125, 0.0500000007,  0.100000001
    290,        0.125,           0.,  0.100000001
    291,  0.150000006,  0.075000003,  0.100000001
    292,  0.150000006,  0.100000001,        0.125
    293,  0.150000006,  0.075000003,  0.150000006
    294,        0.125,  0.100000001,  0.150000006
    295,        0.125,  0.100000001,  0.100000001
    296,  0.150000006,        0.125,  0.100000001
    297,  0.150000006,  0.150000006,        0.125
    298,  0.150000006,        0.125,  0.150000006
    299,        0.125,  0.150000006,  0.150000006
    300,        0.125,  0.150000006,  0.100000001
    301,  0.150000006,  0.175000012,  0.100000001
    302,  0.150000006,  0.200000003,        0.125
    303,  0.150000006,  0.175000012,  0.150000006
    304,        0.125,  0.200000003,  0.150000006
    305,        0.125,  0.200000003,  0.100000001
    306,  0.150000006,  0.224999994,  0.100000001
    307,  0.150000006,         0.25,        0.125
    308,  0.150000006,  0.224999994,  0.150000006
    309,        0.125,         0.25,  0.150000006
    310,        0.125,         0.25,  0.100000001
    311,  0.150000006,           0.,  0.075000003
    312,  0.150000006, 0.0250000004, 0.0500000007
    313,  0.150000006, 0.0500000007,  0.075000003
    314,        0.125, 0.0500000007, 0.0500000007
    315,        0.125,           0., 0.0500000007
    316,  0.150000006,  0.075000003, 0.0500000007
    317,  0.150000006,  0.100000001,  0.075000003
    318,        0.125,  0.100000001, 0.0500000007
    319,  0.150000006,        0.125, 0.0500000007
    320,  0.150000006,  0.150000006,  0.075000003
    321,        0.125,  0.150000006, 0.0500000007
    322,  0.150000006,  0.175000012, 0.0500000007
    323,  0.150000006,  0.200000003,  0.075000003
    324,        0.125,  0.200000003, 0.0500000007
    325,  0.150000006,  0.224999994, 0.0500000007
    326,  0.150000006,         0.25,  0.075000003
    327,        0.125,         0.25, 0.0500000007
    328,  0.150000006,           0., 0.0250000004
    329,  0.150000006, 0.0250000004,           0.
    330,  0.150000006, 0.0500000007, 0.0250000004
    331,        0.125, 0.0500000007,           0.
    332,        0.125,           0.,           0.
    333,  0.150000006,  0.075000003,           0.
    334,  0.150000006,  0.100000001, 0.0250000004
    335,        0.125,  0.100000001,           0.
    336,  0.150000006,        0.125,           0.
    337,  0.150000006,  0.150000006, 0.0250000004
    338,        0.125,  0.150000006,           0.
    339,  0.150000006,  0.175000012,           0.
    340,  0.150000006,  0.200000003, 0.0250000004
    341,        0.125,  0.200000003,           0.
    342,  0.150000006,  0.224999994,           0.
    343,  0.150000006,         0.25, 0.0250000004
    344,        0.125,         0.25,           0.
    345,  0.200000003,           0.,        0.125
    346,  0.200000003, 0.0250000004,  0.100000001
    347,  0.200000003, 0.0500000007,        0.125
    348,  0.200000003, 0.0250000004,  0.150000006
    349,  0.175000012, 0.0500000007,  0.150000006
    350,  0.174999997,           0.,  0.150000006
    351,  0.175000012, 0.0500000007,  0.100000001
    352,  0.175000012,           0.,  0.100000001
    353,  0.200000003,  0.075000003,  0.100000001
    354,  0.200000003,  0.100000001,        0.125
    355,  0.200000003,  0.075000003,  0.150000006
    356,  0.175000012,  0.100000001,  0.150000006
    357,  0.175000012,  0.100000001,  0.100000001
    358,  0.200000003,        0.125,  0.100000001
    359,  0.200000003,  0.150000006,        0.125
    360,  0.200000003,        0.125,  0.150000006
    361,  0.175000012,  0.150000006,  0.150000006
    362,  0.175000012,  0.150000006,  0.100000001
    363,  0.200000003,  0.175000012,  0.100000001
    364,  0.200000003,  0.200000003,        0.125
    365,  0.200000003,  0.175000012,  0.150000006
    366,  0.175000012,  0.200000003,  0.150000006
    367,  0.175000012,  0.200000003,  0.100000001
    368,  0.200000003,  0.224999994,  0.100000001
    369,  0.200000003,         0.25,        0.125
    370,  0.200000003,  0.225000009,  0.150000006
    371,  0.174999997,         0.25,  0.150000006
    372,  0.175000012,         0.25,  0.100000001
    373,  0.200000003,           0.,  0.075000003
    374,  0.200000003, 0.0250000004, 0.0500000007
    375,  0.200000003, 0.0500000007,  0.075000003
    376,  0.175000012, 0.0500000007, 0.0500000007
    377,  0.175000012,           0., 0.0500000007
    378,  0.200000003,  0.075000003, 0.0500000007
    379,  0.200000003,  0.100000001,  0.075000003
    380,  0.175000012,  0.100000001, 0.0500000007
    381,  0.200000003,        0.125, 0.0500000007
    382,  0.200000003,  0.150000006,  0.075000003
    383,  0.175000012,  0.150000006, 0.0500000007
    384,  0.200000003,  0.175000012, 0.0500000007
    385,  0.200000003,  0.200000003,  0.075000003
    386,  0.175000012,  0.200000003, 0.0500000007
    387,  0.200000003,  0.224999994, 0.0500000007
    388,  0.200000003,         0.25,  0.075000003
    389,  0.175000012,         0.25, 0.0500000007
    390,  0.200000003,           0., 0.0250000004
    391,  0.200000003, 0.0250000004,           0.
    392,  0.200000003, 0.0500000007, 0.0250000004
    393,  0.175000012, 0.0500000007,           0.
    394,  0.174999997,           0.,           0.
    395,  0.200000003,  0.075000003,           0.
    396,  0.200000003,  0.100000001, 0.0250000004
    397,  0.175000012,  0.100000001,           0.
    398,  0.200000003,        0.125,           0.
    399,  0.200000003,  0.150000006, 0.0250000004
    400,  0.175000012,  0.150000006,           0.
    401,  0.200000003,  0.175000012,           0.
    402,  0.200000003,  0.200000003, 0.0250000004
    403,  0.175000012,  0.200000003,           0.
    404,  0.200000003,  0.225000009,           0.
    405,  0.200000003,         0.25, 0.0250000004
    406,  0.174999997,         0.25,           0.
*Element, type=C3D20
 1,  25,  26,  32,  31,   1,   2,   8,   7, 124, 123, 122, 121, 125, 126, 127,
    128, 130, 129, 131, 132
 2,  26,  27,  33,  32,   2,   3,   9,   8, 135, 134, 133, 123, 136, 137, 138,
    126, 129, 139, 140, 131
 3,  27,  28,  34,  33,   3,   4,  10,   9, 143, 142, 141, 134, 144, 145, 146,
    137, 139, 147, 148, 140
 4,  28,  29,  35,  34,   4,   5,  11,  10, 151, 150, 149, 142, 152, 153, 154,
    145, 147, 155, 156, 148
 5,  29,  30,  36,  35,   5,   6,  12,  11, 159, 158, 157, 150, 160, 161, 162,
    153, 155, 163, 164, 156
 6,  31,  32,  38,  37,   7,   8,  14,  13, 122, 167, 166, 165, 127, 168, 169,
    170, 132, 131, 171, 172
 7,  32,  33,  39,  38,   8,   9,  15,  14, 133, 174, 173, 167, 138, 175, 176,
    168, 131, 140, 177, 171
 8,  33,  34,  40,  39,   9,  10,  16,  15, 141, 179, 178, 174, 146, 180, 181,
    175, 140, 148, 182, 177
 9,  34,  35,  41,  40,  10,  11,  17,  16, 149, 184, 183, 179, 154, 185, 186,
    180, 148, 156, 187, 182
10,  35,  36,  42,  41,  11,  12,  18,  17, 157, 189, 188, 184, 162, 190, 191,
    185, 156, 164, 192, 187
11,  37,  38,  44,  43,  13,  14,  20,  19, 166, 195, 194, 193, 169, 196, 197,
    198, 172, 171, 199, 200
12,  38,  39,  45,  44,  14,  15,  21,  20, 173, 202, 201, 195, 176, 203, 204,
    196, 171, 177, 205, 199
13,  39,  40,  46,  45,  15,  16,  22,  21, 178, 207, 206, 202, 181, 208, 209,
    203, 177, 182, 210, 205
14,  40,  41,  47,  46,  16,  17,  23,  22, 183, 212, 211, 207, 186, 213, 214,
    208, 182, 187, 215, 210
15,  41,  42,  48,  47,  17,  18,  24,  23, 188, 217, 216, 212, 191, 218, 219,
    213, 187, 192, 220, 215
16,  49,  50,  56,  55,  25,  26,  32,  31, 224, 223, 222, 221, 124, 123, 122,
    121, 226, 225, 227, 228
17,  50,  51,  57,  56,  26,  27,  33,  32, 231, 230, 229, 223, 135, 134, 133,
    123, 225, 232, 233, 227
18,  51,  52,  58,  57,  27,  28,  34,  33, 236, 235, 234, 230, 143, 142, 141,
    134, 232, 237, 238, 233
19,  52,  53,  59,  58,  28,  29,  35,  34, 241, 240, 239, 235, 151, 150, 149,
    142, 237, 242, 243, 238
20,  53,  54,  60,  59,  29,  30,  36,  35, 246, 245, 244, 240, 159, 158, 157,
    150, 242, 247, 248, 243
21,  55,  56,  62,  61,  31,  32,  38,  37, 222, 251, 250, 249, 122, 167, 166,
    165, 228, 227, 252, 253
22,  56,  57,  63,  62,  32,  33,  39,  38, 229, 255, 254, 251, 133, 174, 173,
    167, 227, 233, 256, 252
23,  57,  58,  64,  63,  33,  34,  40,  39, 234, 258, 257, 255, 141, 179, 178,
    174, 233, 238, 259, 256
24,  58,  59,  65,  64,  34,  35,  41,  40, 239, 261, 260, 258, 149, 184, 183,
    179, 238, 243, 262, 259
25,  59,  60,  66,  65,  35,  36,  42,  41, 244, 264, 263, 261, 157, 189, 188,
    184, 243, 248, 265, 262
26,  61,  62,  68,  67,  37,  38,  44,  43, 250, 268, 267, 266, 166, 195, 194,
    193, 253, 252, 269, 270
27,  62,  63,  69,  68,  38,  39,  45,  44, 254, 272, 271, 268, 173, 202, 201,
    195, 252, 256, 273, 269
28,  63,  64,  70,  69,  39,  40,  46,  45, 257, 275, 274, 272, 178, 207, 206,
    202, 256, 259, 276, 273
29,  64,  65,  71,  70,  40,  41,  47,  46, 260, 278, 277, 275, 183, 212, 211,
    207, 259, 262, 279, 276
30,  65,  66,  72,  71,  41,  42,  48,  47, 263, 281, 280, 278, 188, 217, 216,
    212, 262, 265, 282, 279
31,  73,  74,  80,  79,  49,  50,  56,  55, 286, 285, 284, 283, 224, 223, 222,
    221, 288, 287, 289, 290
32,  74,  75,  81,  80,  50,  51,  57,  56, 293, 292, 291, 285, 231, 230, 229,
    223, 287, 294, 295, 289
33,  75,  76,  82,  81,  51,  52,  58,  57, 298, 297, 296, 292, 236, 235, 234,
    230, 294, 299, 300, 295
34,  76,  77,  83,  82,  52,  53,  59,  58, 303, 302, 301, 297, 241, 240, 239,
    235, 299, 304, 305, 300
35,  77,  78,  84,  83,  53,  54,  60,  59, 308, 307, 306, 302, 246, 245, 244,
    240, 304, 309, 310, 305
36,  79,  80,  86,  85,  55,  56,  62,  61, 284, 313, 312, 311, 222, 251, 250,
    249, 290, 289, 314, 315
37,  80,  81,  87,  86,  56,  57,  63,  62, 291, 317, 316, 313, 229, 255, 254,
    251, 289, 295, 318, 314
38,  81,  82,  88,  87,  57,  58,  64,  63, 296, 320, 319, 317, 234, 258, 257,
    255, 295, 300, 321, 318
39,  82,  83,  89,  88,  58,  59,  65,  64, 301, 323, 322, 320, 239, 261, 260,
    258, 300, 305, 324, 321
40,  83,  84,  90,  89,  59,  60,  66,  65, 306, 326, 325, 323, 244, 264, 263,
    261, 305, 310, 327, 324
41,  85,  86,  92,  91,  61,  62,  68,  67, 312, 330, 329, 328, 250, 268, 267,
    266, 315, 314, 331, 332
42,  86,  87,  93,  92,  62,  63,  69,  68, 316, 334, 333, 330, 254, 272, 271,
    268, 314, 318, 335, 331
43,  87,  88,  94,  93,  63,  64,  70,  69, 319, 337, 336, 334, 257, 275, 274,
    272, 318, 321, 338, 335
44,  88,  89,  95,  94,  64,  65,  71,  70, 322, 340, 339, 337, 260, 278, 277,
    275, 321, 324, 341, 338
45,  89,  90,  96,  95,  65,  66,  72,  71, 325, 343, 342, 340, 263, 281, 280,
    278, 324, 327, 344, 341
46,  97,  98, 104, 103,  73,  74,  80,  79, 348, 347, 346, 345, 286, 285, 284,
    283, 350, 349, 351, 352
47,  98,  99, 105, 104,  74,  75,  81,  80, 355, 354, 353, 347, 293, 292, 291,
    285, 349, 356, 357, 351
48,  99, 100, 106, 105,  75,  76,  82,  81, 360, 359, 358, 354, 298, 297, 296,
    292, 356, 361, 362, 357
49, 100, 101, 107, 106,  76,  77,  83,  82, 365, 364, 363, 359, 303, 302, 301,
    297, 361, 366, 367, 362
50, 101, 102, 108, 107,  77,  78,  84,  83, 370, 369, 368, 364, 308, 307, 306,
    302, 366, 371, 372, 367
51, 103, 104, 110, 109,  79,  80,  86,  85, 346, 375, 374, 373, 284, 313, 312,
    311, 352, 351, 376, 377
52, 104, 105, 111, 110,  80,  81,  87,  86, 353, 379, 378, 375, 291, 317, 316,
    313, 351, 357, 380, 376
53, 105, 106, 112, 111,  81,  82,  88,  87, 358, 382, 381, 379, 296, 320, 319,
    317, 357, 362, 383, 380
54, 106, 107, 113, 112,  82,  83,  89,  88, 363, 385, 384, 382, 301, 323, 322,
    320, 362, 367, 386, 383
55, 107, 108, 114, 113,  83,  84,  90,  89, 368, 388, 387, 385, 306, 326, 325,
    323, 367, 372, 389, 386
56, 109, 110, 116, 115,  85,  86,  92,  91, 374, 392, 391, 390, 312, 330, 329,
    328, 377, 376, 393, 394
57, 110, 111, 117, 116,  86,  87,  93,  92, 378, 396, 395, 392, 316, 334, 333,
    330, 376, 380, 397, 393
58, 111, 112, 118, 117,  87,  88,  94,  93, 381, 399, 398, 396, 319, 337, 336,
    334, 380, 383, 400, 397
59, 112, 113, 119, 118,  88,  89,  95,  94, 384, 402, 401, 399, 322, 340, 339,
    337, 383, 386, 403, 400
60, 113, 114, 120, 119,  89,  90,  96,  95, 387, 405, 404, 402, 325, 343, 342,
    340, 386, 389, 406, 403
*Nset, nset=_PickedSet2, internal, generate
   1,  406,    1
*Elset, elset=_PickedSet2, internal, generate
  1,  60,   1
*Nset, nset=_PickedSet3, internal, generate
   1,  406,    1
*Elset, elset=_PickedSet3, internal, generate
  1,  60,   1
*Nset, nset=_PickedSet9, internal, generate
   1,  406,    1
*Elset, elset=_PickedSet9, internal, generate
  1,  60,   1
*Orientation, name=Ori-1
1., 0., 0., 0., 1., 0.
1, 0.
** Section: pztsection
*Solid Section, elset=_PickedSet2, orientation=Ori-1, material=PZT5h
,
*End Part
**  
**
** ASSEMBLY
**
*Assembly, name=Assembly
**  
*Instance, name=pzttest-1, part=pzttest
*End Instance
**  
*Nset, nset=volt_top, instance=pzttest-1
   1,   2,   3,   4,   5,   6,  25,  26,  27,  28,  29,  30,  49,  50,  51,  52
  53,  54,  73,  74,  75,  76,  77,  78,  97,  98,  99, 100, 101, 102, 124, 125
 129, 130, 135, 136, 139, 143, 144, 147, 151, 152, 155, 159, 160, 163, 224, 225
 226, 231, 232, 236, 237, 241, 242, 246, 247, 286, 287, 288, 293, 294, 298, 299
 303, 304, 308, 309, 348, 349, 350, 355, 356, 360, 361, 365, 366, 370, 371
*Elset, elset=volt_top, instance=pzttest-1
  1,  2,  3,  4,  5, 16, 17, 18, 19, 20, 31, 32, 33, 34, 35, 46
 47, 48, 49, 50
*Nset, nset=volt_bot, instance=pzttest-1
 115,
*Nset, nset=wholething, instance=pzttest-1, generate
   1,  406,    1
*Elset, elset=wholething, instance=pzttest-1, generate
  1,  60,   1
*Nset, nset=_PickedSet12, internal, instance=pzttest-1
   1,   2,   3,   4,   5,   6,  25,  26,  27,  28,  29,  30,  49,  50,  51,  52
  53,  54,  73,  74,  75,  76,  77,  78,  97,  98,  99, 100, 101, 102, 124, 125
 129, 130, 135, 136, 139, 143, 144, 147, 151, 152, 155, 159, 160, 163, 224, 225
 226, 231, 232, 236, 237, 241, 242, 246, 247, 286, 287, 288, 293, 294, 298, 299
 303, 304, 308, 309, 348, 349, 350, 355, 356, 360, 361, 365, 366, 370, 371
*Elset, elset=_PickedSet12, internal, instance=pzttest-1
  1,  2,  3,  4,  5, 16, 17, 18, 19, 20, 31, 32, 33, 34, 35, 46
 47, 48, 49, 50
*Nset, nset=_PickedSet15, internal, instance=pzttest-1, generate
   1,  406,    1
*Elset, elset=_PickedSet15, internal, instance=pzttest-1, generate
  1,  60,   1
*Elset, elset=__PickedSurf4_S5, internal, instance=pzttest-1
 11, 12, 13, 14, 15, 26, 27, 28, 29, 30, 41, 42, 43, 44, 45, 56
 57, 58, 59, 60
*Surface, type=ELEMENT, name=_PickedSurf4, internal
__PickedSurf4_S5, S5
*Elset, elset=_pzt_top_S3, internal, instance=pzttest-1
  1,  2,  3,  4,  5, 16, 17, 18, 19, 20, 31, 32, 33, 34, 35, 46
 47, 48, 49, 50
*Surface, type=ELEMENT, name=pzt_top
_pzt_top_S3, S3
*Elset, elset=_pztbot_S5, internal, instance=pzttest-1
 11, 12, 13, 14, 15, 26, 27, 28, 29, 30, 41, 42, 43, 44, 45, 56
 57, 58, 59, 60
*Surface, type=ELEMENT, name=pztbot
_pztbot_S5, S5
*End Assembly
**
** MATERIALS
**
*Material, name=PZT5h
*Density
7500.,
*Dielectric, type=ORTHO
 1.505e-08, 1.301e-08, 1.505e-08
*Elastic, type=ENGINEERING CONSTANTS
 6.061e+10, 4.831e+10, 6.061e+10,     0.512,     0.289,     0.408,   2.3e+10,  2.35e+10
   2.3e+10,
*Piezoelectric, type=E
0.,        0.,        0.,  7.41e-10,        0.,        0., -2.74e-10,  5.93e-10
 -2.74e-10,        0.,        0.,        0.,        0.,        0.,        0.,        0.
        0.,  7.41e-10
**
** BOUNDARY CONDITIONS
**
** Name: BC-3 Type: Symmetry/Antisymmetry/Encastre
*Boundary
_PickedSet12, ENCASTRE
** Name: bottomsurface Type: Electric potential
*Boundary
wholething, 9, 9
** ----------------------------------------------------------------
**
** STEP: apply p load
**
*Step, name="apply p load", nlgeom=YES
*Static
1., 1., 1e-05, 1.
**
** BOUNDARY CONDITIONS
**
** Name: bot Type: Electric potential
*Boundary
_PickedSet15, 9, 9
**
** LOADS
**
** Name: pressure load   Type: Pressure
*Dsload
_PickedSurf4, P, -500.
**
** OUTPUT REQUESTS
**
*Restart, write, frequency=0
**
** FIELD OUTPUT: F-Output-1
**
*Output, field
*Node Output
CECUR, CF, EPOT, RCHG, RECUR, RF, U
*Element Output, directions=YES
EFLX, EPG, LE, PE, PEEQ, PEMAG, S
*Contact Output
CDISP, CSTRESS
**
** FIELD OUTPUT: F-Output-4
**
*Node Output
CECHG, CECUR, EPOT, RCHG, RECUR
*Element Output, directions=YES
ECD, EFLX, EPG, NCURS
*Contact Output
ECD, ECDA, ECDT, ECDTA
**
** FIELD OUTPUT: F-Output-3
**
*Node Output, nset=volt_bot
CECHG, CECUR, EPOT, RCHG, RECUR
**
** FIELD OUTPUT: F-Output-2
**
*Node Output, nset=volt_top
CECHG, CECUR, EPOT, RCHG, RECUR
*Element Output, elset=volt_top, directions=YES
EFLX, EPG
**
** HISTORY OUTPUT: H-Output-2
**
*Output, history
*Node Output, nset=volt_bot
CECHG, EPOT, RCHG
**
** HISTORY OUTPUT: H-Output-3
**
*Node Output, nset=volt_top
CECHG, EPOT, RCHG, RECUR
*Element Output, elset=volt_top
EFLX1, EFLX2, EFLX3, EFLXM, EPG1, EPG2, EPG3, EPGM
**
** HISTORY OUTPUT: H-Output-1
**
*Output, history, variable=PRESELECT
*End Step
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Re: how to get electric output from piezoelectric analysis?

Raviteja.P
Hi pumpkinwiz,

the element type you have specified is not a piezoelectric element (you have specified Element, type=C3D20),
Try changing it to C3D20E.

You can change this in Mesh> Element type
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Re: how to get electric output from piezoelectric analysis?

ashokkumar.d
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In reply to this post by pumpkinwiz1
Hii,

As mentioned above by Mr.ravi the mistake in your analysis is of not providing piezoelectric element types(piezoelectric elements have E at the end of the element name such as C3D8E ).change element type to C3D20E.

below all are the output requests you have given in your analysis.you will get all the outputs you have given in field output request

** OUTPUT REQUESTS
**
*Restart, write, frequency=0
**
** FIELD OUTPUT: F-Output-1
**
*Output, field
*Node Output
CECUR, CF, EPOT, RCHG, RECUR, RF, U
*Element Output, directions=YES
EFLX, EPG, LE, PE, PEEQ, PEMAG, S </b
*Contact Output D
CDISP, CSTRESS
**
** FIELD OUTPUT: F-Output-4
**
*Node Output
CECHG, CECUR, EPOT, RCHG, RECUR
*Element Output, directions=YES
ECD, EFLX, EPG, NCURS
*Contact Output
ECD, ECDA, ECDT, ECDTA
**
** FIELD OUTPUT: F-Output-3
**
*Node Output, nset=volt_bot
CECHG, CECUR, EPOT, RCHG, RECUR
**
** FIELD OUTPUT: F-Output-2
**
*Node Output, nset=volt_top
CECHG, CECUR, EPOT, RCHG, RECUR
*Element Output, elset=volt_top, directions=YES
EFLX, EPG
**
** HISTORY OUTPUT: H-Output-2
**
*Output, history
*Node Output, nset=volt_bot
CECHG, EPOT, RCHG
**
** HISTORY OUTPUT: H-Output-3
**
*Node Output, nset=volt_top
CECHG, EPOT, RCHG, RECUR
*Element Output, elset=volt_top
EFLX1, EFLX2, EFLX3, EFLXM, EPG1, EPG2, EPG3, EPGM
**
** HISTORY OUTPUT: H-Output-1
**
*Output, history, variable=PRESELECT
*End Step
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Re: how to get electric output from piezoelectric analysis?

pumpkinwiz1
In reply to this post by Raviteja.P
Hello Raviteja,  

 Thank you so much for this advice- it was such a small piece of the puzzle, but now I am seeing the output.  So just to clarify, is it also needed that I request the history and field output variables every time, or will abaqus automatically request these outputs if a piezoelectric material has been chosen in the material and mesh type?
 

 This is such a big step- thanks again.
 

 sam
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Re: how to get electric output from piezoelectric analysis?

pumpkinwiz1
In reply to this post by ashokkumar.d
Hello Ashokkumar.d, (and others)

Thanks so much for the added advice.  Following your help and some of the example tutorials via abaqus, I revised my simple model.  Just like the example tutorial involving the piezoelectric transducer, I made my simple pzt rectangular model so that the top and bottom surfaces are constrained to the top and bottom node using the EQUATION option, respectively (I assigned DOFs and coefficients as well).  I have then imposed the open circuit conditions by creating an electrical boundary condition at the initial step, and also creating the same electrical boundary condition at the static step (in terms of the mechanical BC, I am just imposing a known displacement value and pinning the other end surface).  

However, upon trying to execute, I get this error:
"2 nodes are missing degree of freedoms. The MPC/Equation/kinematic coupling constraints can not be formed. The nodes have been identified in node set ErrNodeMissingDofConstrDef "

The 2 nodes are the master nodes I assigned to the top and bottom surface.  The weird thing is that the transducer example had the same boundary conditions applied to the master nodes and it executed with no problems.  In addition, there seems to be no other place to set a DOF value to master nodes other than the EQUATION option part- which I already did so.

Why do you think that is?  Any help will be awesome!  Thank you so much so far.

sam
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Re: how to get electric output from piezoelectric analysis?

ashokkumar.d
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Hello sam,

can u forward  your simple PZT rectangular model file to my email id so that i can review the things and tell what is the actual mistake in the file.
my mail id is ashokkumar.d@gowra.com

with regards
Ashok
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Re: how to get electric output from piezoelectric analysis?

pumpkinwiz1
In reply to this post by pumpkinwiz1
Alright just to self-reply- was hoping to see some help regarding this message, but to no avail.   A search involving that nomenclature online didn't reveal anything.  However, debugging my model, I was able to find out that in order to set the equation restraints properly, the master node cannot be a part of the slave surface, and I had to use "geometry" feature to define the surface.  I followed the example tutorial to define a node+element setup to define the surface set, and excluded the one node position.  

 Now, I wanted to see the open circuit situation to monitor the voltage on the pzt part when it is in tension, and therefore created potential boundary conditions in the "initial" step on the master node.  
 

 However, when I look at the results, all I see are Eflux values and Rchg values, and nothing else (ECD, EPOT, etc)- all other values shows 0.  In addition, the Rchg value just shows in magnitude of -12, which seems too low.
 

 is this correct?  I am especially confused about how to set up open circuit conditions and short circuit conditions- any help or reference documents will be useful.
 

 thanks
 sam
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Re: how to get electric output from piezoelectric analysis?

ashish.pandey
This post has NOT been accepted by the mailing list yet.
pumpkinwiz1 wrote
Alright just to self-reply- was hoping to see some help regarding this message, but to no avail.   A search involving that nomenclature online didn't reveal anything.  However, debugging my model, I was able to find out that in order to set the equation restraints properly, the master node cannot be a part of the slave surface, and I had to use "geometry" feature to define the surface.  I followed the example tutorial to define a node+element setup to define the surface set, and excluded the one node position.  

 Now, I wanted to see the open circuit situation to monitor the voltage on the pzt part when it is in tension, and therefore created potential boundary conditions in the "initial" step on the master node.  
 

 However, when I look at the results, all I see are Eflux values and Rchg values, and nothing else (ECD, EPOT, etc)- all other values shows 0.  In addition, the Rchg value just shows in magnitude of -12, which seems too low.
 
 thanks
 is this correct?  I am especially confused about how to set up open circuit conditions and short circuit conditions- any help or reference documents will be useful.
 
 sam
Hello All, I am a relatively new user to Abaqus. I am working on piezoelectric steady state dynamic analysis of a transducer. Currently I only have a circular piezo transducer. My main aim now is to get the Impedance values for a given input voltage. I am exciting the transducer at a frequency of 1 kHz. I would use the relation of Z = Input voltage / Output current.

I apply Potential difference of 60 V as Boundary conditions on the top and bottom surfaces and want to get the electrical current density as field output ( ECD, ECDA, ECDTA ....)
But I am only able to get Nodal charges ( RCHG) as output variable. I get error message that ECD is not available for this type of analysis.

Can someone tell me what this "type of analysis" means and how to get the ECD as output or any other way to calculate the current to get the Impedance values.

Regards
Ashish

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Re: how to get electric output from piezoelectric analysis?

foxtrot
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can u provide the input file (.inp) neerajsinghgeu@gmail.com. I am also working on the same analysis.
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Re: how to get electric output from piezoelectric analysis?

P M G
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Hi all,
A good day.
I want to know what is EFLX (can we treat it as Electrical Displacement D with C/m^2 as unit)? Can we get electrical charges by integrating the value of EFLX (say in z direction)?
I am getting very min RCHG value (10^-10). Can we treat it as the charge generated for static loading?
(I am working on  a charge sensor modeling in Abaqus. I need charges output.)
Thanks all for motivating discussions here.
Regards,
PMG
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