Combined Displacement/Rotation BC?

[Toby_Samples]

I'm looking for any suggestions on how to get this snap fit together.

I can physically/experimentally do this with the 3D-printed equivalent; however, I'd like to scale and substitute materials beyond prototyping.

I'm currently trying the following approximate path (43deg arc displacement of left hook *Black*-below & in-place Amplitude UR3 of right hook to ease entry of left hook *Red*-below (Step-Time:0,0.5,1; Amp:0,1,0; Rotation-Amp:2deg). Any force-based suggestions?

The analysis currently terminates 6ksi short of yield (21ksi):

I'm not necessarily looking for suggestions on analysis methods on the "snap" portion. I plan to use viscous dissipation or dynamic implicit methods to accomplish this.

 

[FEA way]

Is that plot below on undeformed shape ? Or is it the actual deformation with unit scale ? Make sure that all properties (especially those regarding plasticity) and dimensions are correct and thus the hooks aren't too stiff. General contact should handle this but in case of convergence issues try stabilization. Is that dynamic implicit analysis ? You can apply displacement/rotation BCs to whole hooks instead of single node on each one.

 

[Toby_Samples]

Is that plot below on undeformed shape ? Or is it the actual deformation with unit scale ? Make sure that all properties (especially those regarding plasticity) and dimensions are correct and thus the hooks aren't too stiff. General contact should handle this but in case of convergence issues try stabilization.

The plot is the deformed shape to scale. This is a static general analysis. My self-prescribed protocol was to try static with viscous damping then move onto dynamic implicit if there isn't success in my first attempts.

You can apply displacement/rotation BCs to whole hooks instead of single node on each one.

My Reference points are currently kinematically coupled to the surfaces that I press on with my fingers when I snap-fit the part. If I were to apply the BC to every single node as you suggest, wouldn't that force no strain to occur and both objects to act as rigid bodies?

Thank you for your response FEA_way.

 

[FEA way]

That’s fine. I thought you apply displacement BCs to the nodes alone without any coupling to the surface. Stick with displacement control. It's much better than force control in analyses involving contact.
What is your material model ? Can you attach .inp file ? I would take a look.

 

[Mustaine3]

I would apply pressure load to bend the hooks (open them a bit) in a first step. In a second step I would then move the hooks into each other and take away the pressure load.

Maybe a quasi-static analysis in A/Explicit is more efficient, when constant changes in contact and plasticity challenge the convergence in A/Standard.

 

[Toby_Samples]

Wow, thanks FEA_way & Mustaine3 for the follow up (my first posts on this site, and your responses are very welcoming).

What is your material model ?

I'm using an linear-elastic model to debug and once bugs are worked out I will use an elastic-perfectly-plastic set of Al-6063 T5 properties (E=10,000,000 psi; nu=0.33, S_y=21000psi)

I would apply pressure load to bend the hooks (open them a bit) in a first step. In a second step I would then move the hooks into each other and take away the pressure load.

Thanks for the suggestion, Mustaine3. I am mostly interested in the reaction forces at the Control/Reference points, so this may complicate my end goal. I will try it though and make some judgements on the output.

Inp File (reduced interfering geometry feature from original post; using linear displacement rather than arc with little help):

*Heading
** Job name: Job-0002-1-0-1-5 Model name: Model-0002-1-0-1-5
** Generated by: Abaqus/CAE 2018
*Preprint, echo=NO, model=NO, history=NO, contact=NO
**
** PARTS
**
*Part, name=Part-1
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   1591, 0.0040995474,  0.732348084
   1592, 0.00376856746,  0.719972491
   1593, 0.0333199576,  0.760658562
   1594, 0.0684153363,   0.79563868
   1595, -0.00972742401,  0.747945189
   1596, 0.0626472384,  0.765974164
   1597, 0.0398233011,  0.775653064
   1598, 0.0610478558,  0.786106348
   1599, 0.0021702738,  0.765769243
   1600, 0.0605275594,  0.768613696
   1601, 0.0298453271,  0.762325943
   1602, 0.0205320399,  0.738717675
   1603, 0.0185557418,  0.741217494
   1604, 0.0265214145,  0.777426183
   1605,  0.083721377,  0.795215786
   1606, 0.0811412334,  0.798973382
   1607, 0.0812881365,  0.787554026
   1608, 0.0633631796,  0.760015011
   1609, -0.00624762196,  0.747978568
   1610, 0.0246404279,  0.762497187
   1611, 0.0782500654,  0.783482671
   1612, 0.0418799371,  0.772960901
   1613, 0.0702901781,  0.801130831
   1614, 0.0644743443,  0.787205577
   1615, 0.0447687246,  0.777736902
   1616, 0.0559562221,  0.767519057
   1617, 0.0396516733,  0.771153927
   1618, 0.0484176353,  0.783951223
   1619, 0.0670571178,  0.770900726
   1620, 0.0778063163,  0.795806587
   1621, 0.0151527682,  0.750573039
   1622, 0.0694716945,  0.773225844
   1623, 0.0324091502,  0.770528018
   1624, 0.0657332242,  0.784472823
   1625, 0.0160401966,  0.746100307
   1626, 0.0748178214,  0.782723308
   1627, 0.0598201975,  0.773852289
   1628, 0.0480663627,  0.781920791
   1629, 0.0651409402,  0.773015797
   1630, 0.0109005533,  0.750316679
   1631, 0.00828684773,  0.751423597
   1632, 0.0497977883,  0.779430091
   1633, 0.0516601987,  0.778544962
   1634, 0.0632707551,  0.774501503
   1635, 0.0668673068,  0.782985985
*Element, type=CPS3
 1, 1417, 1322,  129
 2,  159, 1517,  152
 3, 1268, 1333, 1549
 4,  716,  238,  617
 5,  782,  788,  734
 6, 1607,  740,  989
 7,  763,  715,  727
 8,  821,  722,  765
 9, 1514,  778,  640
10,  873,  820,  773
11, 1587, 1604,  756
12,  885,  882, 1635
13,  915,  843,  855
14,  908,  856,  809
15,  990,  271,  927
16,  959,  908,  869
17, 1019,  964,  264
18, 1102, 1630, 1631
19, 1601, 1116, 1117
20, 1618, 1031,  967
21, 1069, 1001, 1033
22, 1633, 1122, 1099
23,  263, 1149, 1125
24, 1491, 1242, 1490
25, 1218, 1270, 1219
26, 1354, 1329,  178
27, 1381,  275, 1370
28, 1503, 1354, 1532
29, 1408, 1526, 1392
30, 1551, 1403, 1531
31, 1404,  241, 1357
32, 1509, 1456, 1380
33, 1386,  129, 1255
34,  163, 1407, 1398
35, 1511, 1411,  127
36, 1432, 1395, 1412
37, 1444,  144, 1411
38, 1385, 1477,  173
39, 1170, 1490, 1171
40, 1505,  169, 1489
41, 1502,  139,  155
42, 1506,  170, 1242
43, 1527,  861, 1512
44, 1367,  252, 1496
45, 1542,  151, 1430
46, 1548,  796,  851
47, 1575,  834,  231
48, 1582,  193, 1081
49, 1554, 1587,  703
50, 1608,  658,  721
51, 1002, 1616,  224
52, 1635, 1624,  212
53, 1626,  722,  866
54,  842, 1627,  900
*Element, type=CPS4R
  55, 1284, 1212, 1279, 1494
  56,  296, 1212, 1214,    3
  57, 1276,  136, 1214,  122
  58,  120,  135, 1276,  121
  59, 1456, 1457,  134,  120
  60, 1456, 1509, 1378, 1457
  61,  119, 1310, 1485, 1361
  62, 1181, 1260, 1481,  118
  63, 1493, 1256,  117, 1231
  64, 1261, 1255,  116, 1182
  65, 1362, 1338, 1311, 1480
  66,  114, 1319, 1377, 1510
  67,  125,  113,  112, 1540
  68, 1277,  111, 1539,  110
  69,  110, 1211, 1215, 1277
  70, 1497, 1221,  147,  146
  71, 1498, 1207,  148, 1271
  72,  308,  148, 1207,   13
  73,   12, 1223,  148,  308
  74,  307, 1210, 1223,   12
  75, 1210,  307,  306,  157
  76,  149, 1223, 1210,  150
  77,  144, 1444, 1434, 1542
  78,  126,  145, 1511, 1510
  79,  113, 1377, 1319, 1373
  80, 1211,  110, 1285, 1305
  81, 1211, 1305,  312,  311
  82,   98, 1301,  313,   16
  83,   16,  312, 1305,   98
  84, 1465,   11,  305,  158
  85, 1499,  157, 1465, 1306
  86, 1412, 1369, 1390, 1430
  87, 1338, 1362, 1369,  128
  88,  304, 1218, 1219,   10
  89, 1395, 1432, 1429, 1399
  90, 1395, 1399, 1386,  128
  91, 1386, 1255, 1261,  128
  92, 1409, 1504, 1391,  140
  93, 1433,  154, 1442,  140
  94,  156, 1296,  155, 1222
  95,  156,    6,  299, 1208
  96, 1483, 1467, 1468,  137
  97,  137,  134,  138, 1483
  98,  138,  134, 1457,  133
  99,  133, 1458, 1409,  139
 100, 1509,  119, 1361, 1378
 101, 1222,  300,    6,  156
 102, 1453, 1213, 1222,  155
 103, 1450, 1307, 1466,  161
 104, 1517,  159,  153, 1422
 105, 1218, 1220, 1304, 1270
 106, 1216,  135,  137, 1468
 107, 1276,  135, 1216,  136
 108,  104,    2,  294, 1280
 109, 1280,  294,    1, 1224
 110, 1526, 1408,  168, 1363
 111, 1348, 1321,  175, 1282
 112, 1471, 1470,   25,  321
 113,  322, 1473, 1472,   26
 114, 1472, 1473,  173, 1477
 115, 1336, 1247, 1475,  165
 116, 1387, 1396,  163, 1398
 117, 1525, 1535,  106, 1346
 118, 1212,  296,  295, 1279
 119, 1332,  105,  104, 1280
 120, 1415,  163, 1445, 1419
 121, 1385, 1405, 1384,  172
 122, 1471, 1472, 1477, 1237
 123,  173, 1475, 1247, 1385
 124, 1224,    1,  293, 1225
 125, 1288, 1328, 1331,   85
 126,  171, 1376,

 

[FEA way]

The main problem here is that it’s really hard for these hooks to connect due to their geometry. Maybe you could redesign them a bit (if it’s not possible proceed to further suggestions). The way they enter (BCs) should also be different but this requires many tests to get it right. And finally mesh could be refined in the contact area.