Hello ,
The following strip rolls without issue when I request a time step that doesn’t generate a rotation that pass exactly through the 360º value.
The rotation boundary condition is built as 360 * t by means of an amplitude.
My advancing step is direct to force passing through multiples of 360º if I want.
Overall time periods of 1, 2 or 3 makes the convergence to fail while .98, 1.98 or 2.98 converges without issue.
I would say ccx doesn’t like the 360º value.(180º might have the same issue).
This .inp file runs correctly (converges) in Abaqus for the timeperiod 3 while it fails in ccx.
Hello , The following strip rolls without issue when I request a time step that doesn’t generate a rotation that pass exactly through the 360º value. The rotation boundary condition is built as 360 * t by means of an amplitude. My advancing step is direct to force passing through multiples of 360º if I want. Overall time periods of 1, 2 or 3 makes the convergence to fail while .98, 1.98 or 2.98 converges without issue. I would say ccx doesn’t like the 360º value.(180º might have the same issue). This .inp file runs correctly (converges) in Abaqus for the timeperiod 3 while it fails in ccx.
`* Generated by Mecway 24 NODE 1,12,-0.5,0 2,0,-0.5,0 3,0.75,-0.5,0 4,1.5,-0.5,0 5,2.25,-0.5,0 6,3,-0.5,0 7,3.75,-0.5,0 8,4.5,-0.5,0 9,5.25,-0.5,0 10,6,-0.5,0 11,6.75,-0.5,0 12,7.5,-0.5,0 13,8.25,-0.5,0 14,9,-0.5,0 15,9.75,-0.5,0 16,10.5,-0.5,0 17,11.25,-0.5,0 18,11.25,0.5,0 19,12,0.5,0 20,0,0.5,0 21,0.75,0.5,0 22,1.5,0.5,0 23,2.25,0.5,0 24,3,0.5,0 25,3.75,0.5,0 26,4.5,0.5,0 27,5.25,0.5,0 28,6,0.5,0 29,6.75,0.5,0 30,7.5,0.5,0 31,8.25,0.5,0 32,9,0.5,0 33,9.75,0.5,0 34,10.5,0.5,0 35,11.625,-0.5,0 36,11.625,0.5,0 37,0.375,-0.5,0 38,0.375,0.5,0 39,1.125,-0.5,0 40,1.125,0.5,0 41,1.875,-0.5,0 42,1.875,0.5,0 43,2.625,-0.5,0 44,2.625,0.5,0 45,3.375,-0.5,0 46,3.375,0.5,0 47,4.125,-0.5,0 48,4.125,0.5,0 49,4.875,-0.5,0 50,4.875,0.5,0 51,5.625,-0.5,0 52,5.625,0.5,0 53,6.375,-0.5,0 54,6.375,0.5,0 55,7.125,-0.5,0 56,7.125,0.5,0 57,7.875,-0.5,0 58,7.875,0.5,0 59,8.625,-0.5,0 60,8.625,0.5,0 61,9.375,-0.5,0 62,9.375,0.5,0 63,10.125,-0.5,0 64,10.125,0.5,0 65,10.875,-0.5,0 66,10.875,0.5,0 67,11.4375,-0.5,0 68,11.4375,0.5,0 69,0.1875,-0.5,0 70,0.1875,0.5,0 71,0.9375,-0.5,0 72,0.9375,0.5,0 73,1.6875,-0.5,0 74,1.6875,0.5,0 75,2.4375,-0.5,0 76,2.4375,0.5,0 77,3.1875,-0.5,0 78,3.1875,0.5,0 79,3.9375,-0.5,0 80,3.9375,0.5,0 81,4.6875,-0.5,0 82,4.6875,0.5,0 83,5.4375,-0.5,0 84,5.4375,0.5,0 85,6.1875,-0.5,0 86,6.1875,0.5,0 87,6.9375,-0.5,0 88,6.9375,0.5,0 89,7.6875,-0.5,0 90,7.6875,0.5,0 91,8.4375,-0.5,0 92,8.4375,0.5,0 93,9.1875,-0.5,0 94,9.1875,0.5,0 95,9.9375,-0.5,0 96,9.9375,0.5,0 97,10.6875,-0.5,0 98,10.6875,0.5,0 99,11.8125,-0.5,0 100,11.8125,0.5,0 101,0.5625,-0.5,0 102,0.5625,0.5,0 103,1.3125,-0.5,0 104,1.3125,0.5,0 105,2.0625,-0.5,0 106,2.0625,0.5,0 107,2.8125,-0.5,0 108,2.8125,0.5,0 109,3.5625,-0.5,0 110,3.5625,0.5,0 111,4.3125,-0.5,0 112,4.3125,0.5,0 113,5.0625,-0.5,0 114,5.0625,0.5,0 115,5.8125,-0.5,0 116,5.8125,0.5,0 117,6.5625,-0.5,0 118,6.5625,0.5,0 119,7.3125,-0.5,0 120,7.3125,0.5,0 121,8.0625,-0.5,0 122,8.0625,0.5,0 123,8.8125,-0.5,0 124,8.8125,0.5,0 125,9.5625,-0.5,0 126,9.5625,0.5,0 127,10.3125,-0.5,0 128,10.3125,0.5,0 129,11.0625,-0.5,0 130,11.0625,0.5,0 ELEMENT,TYPE=S4R 1,67,17,18,68 2,69,2,20,70 3,71,3,21,72 4,73,4,22,74 5,75,5,23,76 6,77,6,24,78 7,79,7,25,80 8,81,8,26,82 9,83,9,27,84 10,85,10,28,86 11,87,11,29,88 12,89,12,30,90 13,91,13,31,92 14,93,14,32,94 15,95,15,33,96 16,97,16,34,98 18,99,35,36,100 19,101,37,38,102 20,103,39,40,104 21,105,41,42,106 22,107,43,44,108 23,109,45,46,110 24,111,47,48,112 25,113,49,50,114 26,115,51,52,116 27,117,53,54,118 28,119,55,56,120 29,121,57,58,122 30,123,59,60,124 31,125,61,62,126 32,127,63,64,128 33,129,65,66,130 34,35,67,68,36 35,37,69,70,38 36,39,71,72,40 37,41,73,74,42 38,43,75,76,44 39,45,77,78,46 40,47,79,80,48 41,49,81,82,50 42,51,83,84,52 43,53,85,86,54 44,55,87,88,56 45,57,89,90,58 46,59,91,92,60 47,61,93,94,62 48,63,95,96,64 49,65,97,98,66 50,1,99,100,19 51,3,101,102,21 52,4,103,104,22 53,5,105,106,23 54,6,107,108,24 55,7,109,110,25 56,8,111,112,26 57,9,113,114,27 58,10,115,116,28 59,11,117,118,29 60,12,119,120,30 61,13,121,122,31 62,14,123,124,32 63,15,125,126,33 64,16,127,128,34 65,17,129,130,18 ELEMENT,TYPE=B31 17,1,19 ELSET,ELSET=Default 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 ELSET,ELSET=Component 17 SURFACE,NAME=S1 2,S4 MATERIAL,NAME=Steel ELASTIC,TYPE=ISOTROPIC 1200000,0 DENSITY 7850 MATERIAL,NAME=Material ELASTIC,TYPE=ISOTROPIC 200000000000,0 SHELL SECTION,ELSET=Default,MATERIAL=Steel 0.1 BEAM SECTION,ELSET=Component,MATERIAL=Material,SECTION=RECT 0.2,0.2 -1,0,0 BOUNDARY 1,2,,0 2,1,,0 2,2,,0 2,3,,0 2,4,,0 2,5,,0 2,6,,0 3,2,,0 13,2,,0 17,2,,0 18,2,,0 19,2,,0 20,1,,0 20,2,,0 20,3,,0 20,4,,0 20,5,,0 20,6,,0 21,2,,0 31,2,,0 49,2,,0 50,2,,0 63,2,,0 64,2,,0 105,2,,0 106,2,,0 109,2,,0 110,2,,0 117,2,,0 118,2,,0 AMPLITUDE,NAME=A_1 0,0 3,-18.84955592154 EQUATION 2 1,3,1000,19,3,-1000 STEP,NLGEOM=YES,INC=300,AMPLITUDE=STEP STATIC,SOLVER=PARDISO 0.01,3,0,0 BOUNDARY,AMPLITUDE=A_1 1,5,,1 BOUNDARY,AMPLITUDE=A_1 19,5,,1 NODE FILE,GLOBAL=YES U,RF EL FILE S,NOE END STEP