I reduced the speed and the program seemed to work. However, the speed of the plate was still uneven and was still being bent by the speed boundaries at both ends.
I think like Victor that the easiest way would be if you could post the whole inp with nodes and sets included. A complete âworkingâ version even if results are unexpected would be enough so we could help.
The above are all my files. This can run normally, but it diverge in the early stage of the operation. The reason may be that the boundary speed of the two edges is too fast and the speed of the plate is inconsistent.
hope you can give me some suggestions.
Best regards
Plain inp file in text format please. You can use the preformated text.
Your file shouldnât be more than 100 nodes Âżright?. Enough to show the problem and post it in the forum.
Is it normal the ball rebound is killed just after touching the plate?
*INCLUDE, INPUT=all.msh
*INCLUDE, INPUT=interface_beam.nam
*INCLUDE, INPUT=Nlr.nam
*MATERIAL, Name=EL
*ELASTIC
73100000000, 0.33
*DENSITY
3000
*SOLID SECTION, Elset=Eall, Material=EL
*STEP, NLGEOM, INC=1000000
*DYNAMIC, ALPHA=0.01, DIRECT
*DAMPING,ALPHA=0.01,BETA=0.0004
1E-5, 1.0
*INITIAL CONDITIONS,TYPE=VELOCITY
Nall, 1, 40
Nall, 2, -1.5
*AMPLITUDE, NAME=RAMP_X
0.0, 0.0
1.0, 40
*AMPLITUDE, NAME=RAMP_Y
0.0, 0.0
1.0, -1.5
*BOUNDARY, AMPLITUDE=RAMP_X
Nlrmoving, 1, 1, 1
*BOUNDARY, AMPLITUDE=RAMP_Y
Nlrmoving, 2, 2, 1
*BOUNDARY
Nall, 3
*CLOAD
Nsurface, 1, 0.0
Nsurface, 2, 0.0
Nsurface, 3, 0.0
*NODE FILE
U,V
*EL FILE
S, E
*END STEP
The parameter ALPHA takes an argument between -1/3 and 0.
ÂżCould you post the file with nodes , sets and all BC in a unique file?. It can be a simplified version. It is to check you are defining properly the BC and nodesets.
I understand your problem is that the plate deforms before collision. During the free flight against the obstacle.Âżisnât it?
Your understand is right. The plate deforms before impact, probably due to the velocity boundary. The file containing the nodes contains many lines, you can access it through this link: plate_impact
*STEP, NLGEOM, INC=1000000
*DYNAMIC, ALPHA=0.01, DIRECT
*DAMPING,ALPHA=0.01,BETA=0.0004
1E-5, 1.0
The step card is waiting for the increment size and all the other data but there is a *DAMPING card inbetween. I would try:
*STEP, NLGEOM, INC=1000000
*DYNAMIC, ALPHA=-0.01, DIRECT
1E-5, 0.001
*DAMPING,ALPHA=0.01,BETA=0.0004
Note I have change the overall time to 0.001. During tests you donât want to waste time until being sure everything works fine.
Amplitudes and initial conditions outside the Step.
Why donât you try Prepomax to configure your analisys? You can later look at the inp to see how itâs done. At least you avoid most common mistakes.
Thanks for your suggestion, I will try it. What about others? It seems to me that my boundary nodes are faster, what could be the reason?
What others?
I think we are more lost than Adam on Motherâs Day.
If you have not apply Initial velocity to the whole body your plate could be rotating.
Gravity: ŠAlfonso Cuarón Orozco
My question is: why canât other nodes on the plate move with the displacement boundary I applied to the nodes on the plateâs boundary? Is this a problem with the calculix algorithm? I tried to use ABAQUS to do this case, and all nodes on the plate can move with the points on the boundary.
There must be an error in the BC definition or the Node set definition. Cut your plate to 1/10th itâs size . If you are able to share the full inp in plain text I could try to help .I canât download files for safety reasons. If not, I canât help you sorry. Maybe someone else.
This is the first part of my all.msh file:
*NODE, NSET=Nall
1, 0.493706226, 0.179438025, 0.25
2, 0.493706226, 0.179438025, -0.25
3, 0.492403865, 0.186824083, 0.25
4, 0.492403865, 0.186824083, -0.25
5, 0.491101503, 0.194210142, 0.25
6, 0.491101503, 0.194210142, -0.25
7, 0.483858168, 0.177701548, 0.25
8, 0.483858168, 0.177701548, -0.25
9, 0.482555807, 0.185087606, 0.25
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560, -0.422164977, 0.0179452263, -0.25
561, -0.423467338, 0.025331283, 0.25
This is the second part of my all.msh fileďź
562, -0.423467338, 0.025331283, -0.25
563, -0.4247697, 0.0327173434, 0.25
564, -0.4247697, 0.0327173434, -0.25
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581, -0.454313934, 0.0275078956, 0.25
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606, -0.493706226, 0.0205619689, -0.25
*ELEMENT, TYPE=C3D8I, ELSET=Eall
1, 7, 8, 10, 9, 1, 2, 4, 3
2, 9, 10, 12, 11, 3, 4, 6, 5
3, 13, 14, 16, 15, 7, 8, 10, 9
4, 15, 16, 18, 17, 9, 10, 12, 11
5, 19, 20, 22, 21, 13, 14, 16, 15
6, 21, 22, 24, 23, 15, 16, 18, 17
7, 25, 26, 28, 27, 19, 20, 22, 21
8, 27, 28, 30, 29, 21, 22, 24, 23
9, 31, 32, 34, 33, 25, 26, 28, 27
10, 33, 34, 36, 35, 27, 28, 30, 29
11, 37, 38, 40, 39, 31, 32, 34, 33
12, 39, 40, 42, 41, 33, 34, 36, 35
13, 43, 44, 46, 45, 37, 38, 40, 39
14, 45, 46, 48, 47, 39, 40, 42, 41
15, 49, 50, 52, 51, 43, 44, 46, 45
16, 51, 52, 54, 53, 45, 46, 48, 47
17, 55, 56, 58, 57, 49, 50, 52, 51
18, 57, 58, 60, 59, 51, 52, 54, 53
19, 61, 62, 64, 63, 55, 56, 58, 57
20, 63, 64, 66, 65, 57, 58, 60, 59
21, 67, 68, 70, 69, 61, 62, 64, 63
22, 69, 70, 72, 71, 63, 64, 66, 65
23, 73, 74, 76, 75, 67, 68, 70, 69
24, 75, 76, 78, 77, 69, 70, 72, 71
25, 79, 80, 82, 81, 73, 74, 76, 75
26, 81, 82, 84, 83, 75, 76, 78, 77
27, 85, 86, 88, 87, 79, 80, 82, 81
28, 87, 88, 90, 89, 81, 82, 84, 83
29, 91, 92, 94, 93, 85, 86, 88, 87
30, 93, 94, 96, 95, 87, 88, 90, 89
31, 97, 98, 100, 99, 91, 92, 94, 93
32, 99, 100, 102, 101, 93, 94, 96, 95
33, 103, 104, 106, 105, 97, 98, 100, 99
34, 105, 106, 108, 107, 99, 100, 102, 101
35, 109, 110, 112, 111, 103, 104, 106, 105
36, 111, 112, 114, 113, 105, 106, 108, 107
37, 115, 116, 118, 117, 109, 110, 112, 111
38, 117, 118, 120, 119, 111, 112, 114, 113
39, 121, 122, 124, 123, 115, 116, 118, 117
40, 123, 124, 126, 125, 117, 118, 120, 119
41, 127, 128, 130, 129, 121, 122, 124, 123
42, 129, 130, 132, 131, 123, 124, 126, 125
43, 133, 134, 136, 135, 127, 128, 130, 129
44, 135, 136, 138, 137, 129, 130, 132, 131
45, 139, 140, 142, 141, 133, 134, 136, 135
46, 141, 142, 144, 143, 135, 136, 138, 137
47, 145, 146, 148, 147, 139, 140, 142, 141
48, 147, 148, 150, 149, 141, 142, 144, 143
49, 151, 152, 154, 153, 145, 146, 148, 147
50, 153, 154, 156, 155, 147, 148, 150, 149
51, 157, 158, 160, 159, 151, 152, 154, 153
52, 159, 160, 162, 161, 153, 154, 156, 155
53, 163, 164, 166, 165, 157, 158, 160, 159
54, 165, 166, 168, 167, 159, 160, 162, 161
55, 169, 170, 172, 171, 163, 164, 166, 165
56, 171, 172, 174, 173, 165, 166, 168, 167
57, 175, 176, 178, 177, 169, 170, 172, 171
58, 177, 178, 180, 179, 171, 172, 174, 173
59, 181, 182, 184, 183, 175, 176, 178, 177
60, 183, 184, 186, 185, 177, 178, 180, 179
61, 187, 188, 190, 189, 181, 182, 184, 183
62, 189, 190, 192, 191, 183, 184, 186, 185
63, 193, 194, 196, 195, 187, 188, 190, 189
64, 195, 196, 198, 197, 189, 190, 192, 191
65, 199, 200, 202, 201, 193, 194, 196, 195
66, 201, 202, 204, 203, 195, 196, 198, 197
67, 205, 206, 208, 207, 199, 200, 202, 201
68, 207, 208, 210, 209, 201, 202, 204, 203
69, 211, 212, 214, 213, 205, 206, 208, 207
70, 213, 214, 216, 215, 207, 208, 210, 209
71, 217, 218, 220, 219, 211, 212, 214, 213
72, 219, 220, 222, 221, 213, 214, 216, 215
73, 223, 224, 226, 225, 217, 218, 220, 219
74, 225, 226, 228, 227, 219, 220, 222, 221
75, 229, 230, 232, 231, 223, 224, 226, 225
76, 231, 232, 234, 233, 225, 226, 228, 227
77, 235, 236, 238, 237, 229, 230, 232, 231
78, 237, 238, 240, 239, 231, 232, 234, 233
79, 241, 242, 244, 243, 235, 236, 238, 237
80, 243, 244, 246, 245, 237, 238, 240, 239
81, 247, 248, 250, 249, 241, 242, 244, 243
82, 249, 250, 252, 251, 243, 244, 246, 245
83, 253, 254, 256, 255, 247, 248, 250, 249
84, 255, 256, 258, 257, 249, 250, 252, 251
85, 259, 260, 262, 261, 253, 254, 256, 255
86, 261, 262, 264, 263, 255, 256, 258, 257
87, 265, 266, 268, 267, 259, 260, 262, 261
88, 267, 268, 270, 269, 261, 262, 264, 263
89, 271, 272, 274, 273, 265, 266, 268, 267
90, 273, 274, 276, 275, 267, 268, 270, 269
91, 277, 278, 280, 279, 271, 272, 274, 273
92, 279, 280, 282, 281, 273, 274, 276, 275
93, 283, 284, 286, 285, 277, 278, 280, 279
94, 285, 286, 288, 287, 279, 280, 282, 281
95, 289, 290, 292, 291, 283, 284, 286, 285
96, 291, 292, 294, 293, 285, 286, 288, 287
97, 295, 296, 298, 297, 289, 290, 292, 291
98, 297, 298, 300, 299, 291, 292, 294, 293
99, 301, 302, 304, 303, 295, 296, 298, 297
100, 303, 304, 306, 305, 297, 298, 300, 299
101, 307, 308, 310, 309, 301, 302, 304, 303
102, 309, 310, 312, 311, 303, 304, 306, 305
103, 313, 314, 316, 315, 307, 308, 310, 309
104, 315, 316, 318, 317, 309, 310, 312, 311
105, 319, 320, 322, 321, 313, 314, 316, 315
106, 321, 322, 324, 323, 315, 316, 318, 317
107, 325, 326, 328, 327, 319, 320, 322, 321
108, 327, 328, 330, 329, 321, 322, 324, 323
109, 331, 332, 334, 333, 325, 326, 328, 327
110, 333, 334, 336, 335, 327, 328, 330, 329
111, 337, 338, 340, 339, 331, 332, 334, 333
112, 339, 340, 342, 341, 333, 334, 336, 335
113, 343, 344, 346, 345, 337, 338, 340, 339
114, 345, 346, 348, 347, 339, 340, 342, 341
115, 349, 350, 352, 351, 343, 344, 346, 345
116, 351, 352, 354, 353, 345, 346, 348, 347
117, 355, 356, 358, 357, 349, 350, 352, 351
118, 357, 358, 360, 359, 351, 352, 354, 353
119, 361, 362, 364, 363, 355, 356, 358, 357
120, 363, 364, 366, 365, 357, 358, 360, 359
121, 367, 368, 370, 369, 361, 362, 364, 363
122, 369, 370, 372, 371, 363, 364, 366, 365
123, 373, 374, 376, 375, 367, 368, 370, 369
124, 375, 376, 378, 377, 369, 370, 372, 371
125, 379, 380, 382, 381, 373, 374, 376, 375
126, 381, 382, 384, 383, 375, 376, 378, 377
127, 385, 386, 388, 387, 379, 380, 382, 381
128, 387, 388, 390, 389, 381, 382, 384, 383
129, 391, 392, 394, 393, 385, 386, 388, 387
130, 393, 394, 396, 395, 387, 388, 390, 389
131, 397, 398, 400, 399, 391, 392, 394, 393
132, 399, 400, 402, 401, 393, 394, 396, 395
133, 403, 404, 406, 405, 397, 398, 400, 399
134, 405, 406, 408, 407, 399, 400, 402, 401
135, 409, 410, 412, 411, 403, 404, 406, 405
136, 411, 412, 414, 413, 405, 406, 408, 407
137, 415, 416, 418, 417, 409, 410, 412, 411
138, 417, 418, 420, 419, 411, 412, 414, 413
139, 421, 422, 424, 423, 415, 416, 418, 417
140, 423, 424, 426, 425, 417, 418, 420, 419
141, 427, 428, 430, 429, 421, 422, 424, 423
142, 429, 430, 432, 431, 423, 424, 426, 425
143, 433, 434, 436, 435, 427, 428, 430, 429
144, 435, 436, 438, 437, 429, 430, 432, 431
145, 439, 440, 442, 441, 433, 434, 436, 435
146, 441, 442, 444, 443, 435, 436, 438, 437
147, 445, 446, 448, 447, 439, 440, 442, 441
148, 447, 448, 450, 449, 441, 442, 444, 443
149, 451, 452, 454, 453, 445, 446, 448, 447
150, 453, 454, 456, 455, 447, 448, 450, 449
151, 457, 458, 460, 459, 451, 452, 454, 453
152, 459, 460, 462, 461, 453, 454, 456, 455
153, 463, 464, 466, 465, 457, 458, 460, 459
154, 465, 466, 468, 467, 459, 460, 462, 461
155, 469, 470, 472, 471, 463, 464, 466, 465
156, 471, 472, 474, 473, 465, 466, 468, 467
157, 475, 476, 478, 477, 469, 470, 472, 471
158, 477, 478, 480, 479, 471, 472, 474, 473
159, 481, 482, 484, 483, 475, 476, 478, 477
160, 483, 484, 486, 485, 477, 478, 480, 479
161, 487, 488, 490, 489, 481, 482, 484, 483
162, 489, 490, 492, 491, 483, 484, 486, 485
163, 493, 494, 496, 495, 487, 488, 490, 489
164, 495, 496, 498, 497, 489, 490, 492, 491
165, 499, 500, 502, 501, 493, 494, 496, 495
166, 501, 502, 504, 503, 495, 496, 498, 497
167, 505, 506, 508, 507, 499, 500, 502, 501
168, 507, 508, 510, 509, 501, 502, 504, 503
169, 511, 512, 514, 513, 505, 506, 508, 507
170, 513, 514, 516, 515, 507, 508, 510, 509
171, 517, 518, 520, 519, 511, 512, 514, 513
172, 519, 520, 522, 521, 513, 514, 516, 515
173, 523, 524, 526, 525, 517, 518, 520, 519
174, 525, 526, 528, 527, 519, 520, 522, 521
175, 529, 530, 532, 531, 523, 524, 526, 525
176, 531, 532, 534, 533, 525, 526, 528, 527
177, 535, 536, 538, 537, 529, 530, 532, 531
178, 537, 538, 540, 539, 531, 532, 534, 533
179, 541, 542, 544, 543, 535, 536, 538, 537
180, 543, 544, 546, 545, 537, 538, 540, 539
181, 547, 548, 550, 549, 541, 542, 544, 543
182, 549, 550, 552, 551, 543, 544, 546, 545
183, 553, 554, 556, 555, 547, 548, 550, 549
184, 555, 556, 558, 557, 549, 550, 552, 551
185, 559, 560, 562, 561, 553, 554, 556, 555
186, 561, 562, 564, 563, 555, 556, 558, 557
187, 565, 566, 568, 567, 559, 560, 562, 561
188, 567, 568, 570, 569, 561, 562, 564, 563
189, 571, 572, 574, 573, 565, 566, 568, 567
190, 573, 574, 576, 575, 567, 568, 570, 569
191, 577, 578, 580, 579, 571, 572, 574, 573
192, 579, 580, 582, 581, 573, 574, 576, 575
193, 583, 584, 586, 585, 577, 578, 580, 579
194, 585, 586, 588, 587, 579, 580, 582, 581
195, 589, 590, 592, 591, 583, 584, 586, 585
196, 591, 592, 594, 593, 585, 586, 588, 587
197, 595, 596, 598, 597, 589, 590, 592, 591
198, 597, 598, 600, 599, 591, 592, 594, 593
199, 601, 602, 604, 603, 595, 596, 598, 597
200, 603, 604, 606, 605, 597, 598, 600, 599
Here is my interface_beam.nam file:
** Names based on surface
*NSET,NSET=Nsurface
1,
2,
3,
4,
5,
6,
7,
8,
11,
12,
13,
14,
17,
18,
19,
20,
23,
24,
25,
26,
29,
30,
31,
32,
35,
36,
37,
38,
41,
42,
43,
44,
47,
48,
49,
50,
53,
54,
55,
56,
59,
60,
61,
62,
65,
66,
67,
68,
71,
72,
73,
74,
77,
78,
79,
80,
83,
84,
85,
86,
89,
90,
91,
92,
95,
96,
97,
98,
101,
102,
103,
104,
107,
108,
109,
110,
113,
114,
115,
116,
119,
120,
121,
122,
125,
126,
127,
128,
131,
132,
133,
134,
137,
138,
139,
140,
143,
144,
145,
146,
149,
150,
151,
152,
155,
156,
157,
158,
161,
162,
163,
164,
167,
168,
169,
170,
173,
174,
175,
176,
179,
180,
181,
182,
185,
186,
187,
188,
191,
192,
193,
194,
197,
198,
199,
200,
203,
204,
205,
206,
209,
210,
211,
212,
215,
216,
217,
218,
221,
222,
223,
224,
227,
228,
229,
230,
233,
234,
235,
236,
239,
240,
241,
242,
245,
246,
247,
248,
251,
252,
253,
254,
257,
258,
259,
260,
263,
264,
265,
266,
269,
270,
271,
272,
275,
276,
277,
278,
281,
282,
283,
284,
287,
288,
289,
290,
293,
294,
295,
296,
299,
300,
301,
302,
305,
306,
307,
308,
311,
312,
313,
314,
317,
318,
319,
320,
323,
324,
325,
326,
329,
330,
331,
332,
335,
336,
337,
338,
341,
342,
343,
344,
347,
348,
349,
350,
353,
354,
355,
356,
359,
360,
361,
362,
365,
366,
367,
368,
371,
372,
373,
374,
377,
378,
379,
380,
383,
384,
385,
386,
389,
390,
391,
392,
395,
396,
397,
398,
401,
402,
403,
404,
407,
408,
409,
410,
413,
414,
415,
416,
419,
420,
421,
422,
425,
426,
427,
428,
431,
432,
433,
434,
437,
438,
439,
440,
443,
444,
445,
446,
449,
450,
451,
452,
455,
456,
457,
458,
461,
462,
463,
464,
467,
468,
469,
470,
473,
474,
475,
476,
479,
480,
481,
482,
485,
486,
487,
488,
491,
492,
493,
494,
497,
498,
499,
500,
503,
504,
505,
506,
509,
510,
511,
512,
515,
516,
517,
518,
521,
522,
523,
524,
527,
528,
529,
530,
533,
534,
535,
536,
539,
540,
541,
542,
545,
546,
547,
548,
551,
552,
553,
554,
557,
558,
559,
560,
563,
564,
565,
566,
569,
570,
571,
572,
575,
576,
577,
578,
581,
582,
583,
584,
587,
588,
589,
590,
593,
594,
595,
596,
599,
600,
601,
602,
603,
604,
605,
606,
This is my Nlr.nam file:
** Names based on fix1
*NSET,NSET=Nlrmoving
1,
2,
3,
4,
5,
6,
601,
602,
603,
604,
605,
606,
This is my inp file:
*INCLUDE, INPUT=all.msh
*INCLUDE, INPUT=interface_beam.nam
*INCLUDE, INPUT=Nlr.nam
*MATERIAL, Name=EL
*ELASTIC
73100000000, 0.33
*DENSITY
3000
*SOLID SECTION, Elset=Eall, Material=EL
*STEP, NLGEOM, INC=1000000
*DYNAMIC, ALPHA=0.01, DIRECT
*DAMPING,ALPHA=0.01,BETA=0.0004
1E-5, 1.0
*AMPLITUDE, NAME=RAMP_X
0.0, 0.0
1.0, 40
*AMPLITUDE, NAME=RAMP_Y
0.0, 0.0
1.0, -1.5
*BOUNDARY, AMPLITUDE=RAMP_X
Nlrmoving, 1, 1, 1
*BOUNDARY, AMPLITUDE=RAMP_Y
Nlrmoving, 2, 2, 1
*BOUNDARY
Nall, 3
*CLOAD
Nsurface, 1, 0.0
Nsurface, 2, 0.0
Nsurface, 3, 0.0
*NODE FILE
U,V
*EL FILE
S, E
*END STEP
Thank you very much for your time and help
I have moved some keys.
Beta damping is giving you problems. It works removing it.
Manual says :
âFor explicit dynamic calculations without massless contact (i.e. there is no
card of the type *CONTACT PAIR,TYPE=MASSLESS in the input deck) only
mass proportional damping is allowed, i.e. β must be zero.â
Your analisys is *DYNAMIC implicit .?Âż? Not sure why itâs not allowed.
I will look later. Meantime:
*MATERIAL, Name=EL
*ELASTIC
73100000000, 0.33
*DENSITY
3000
*SOLID SECTION, Elset=Eall, Material=EL
**ADDED
*INITIAL CONDITIONS,TYPE=VELOCITY
NALL,1,40.0
NALL,2,-1.5
NALL,3,0.0
**MOVED OUT STEP
*AMPLITUDE, NAME=RAMP_X
0.0, 0.0
1.0, 40
*AMPLITUDE, NAME=RAMP_Y
0.0, 0.0
1.0, -1.5
*BOUNDARY
Nall, 3
**beta Damping is giving you problems
*DAMPING,ALPHA=.01
**,BETA=4E-4
*STEP, NLGEOM, INC=1000000
*DYNAMIC, ALPHA=-0.01, DIRECT
1E-5, 0.001
*BOUNDARY, AMPLITUDE=RAMP_X
Nlrmoving, 1, 1, 1
*BOUNDARY, AMPLITUDE=RAMP_Y
Nlrmoving, 2, 2, 1
*CLOAD
Nsurface, 1, 0.0
Nsurface, 2, 0.0
Nsurface, 3, 0.0
*NODE FILE
U,V
*EL FILE
S, E
*END STEP
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