$ Units: tonnes, mm, s, MPa $ First period of response is 2.5e-5 sec (per eigenvalue analysis) $ Effect of stiffness damping in implicit is very dependent on step size: $ dt=0.5e-5 then damping effect in implicit is close to damping effect in explicit $ dt=1.0e05 then damping effect in implicit is substantially less $ Plot vm stress vs. time to gage effect of damping $ $ step loading (instantaneous load, hold, release) *KEYWORD *control_implicit_general $1,2e-5 $1,1e-5 1,0.5e-5 *damping_part_stiffness 1, 0.2 *control_timestep ,.5 *control_accuracy ,2 *control_implicit_dynamics 1 *control_hourglass 8 $ ------- eigenvalue analyse ------ $*control_implicit_eigenvalue $10 $ --------- *TITLE Shalow Cap *CONTROL_TERMINATION 0.005 *DATABASE_BINARY_D3PLOT 0.00001 $---+----1----+----2----+----3----+----4----+----5----+----6----+----7----+----8 *DATABASE_NODFOR 1.0e-3 *DATABASE_NODOUT 0.09e-2 *DATABASE_HISTORY_NODE $ id1 32 *DATABASE_NODAL_FORCE_GROUP 1 $---+----1----+----2----+----3----+----4----+----5----+----6----+----7----+----8 $---+----1----+----2----+----3----+----4----+----5----+----6----+----7----+----8 *define_curve 2 0,150 0.00100,150 0.001001,0 $---+----1----+----2----+----3----+----4----+----5----+----6----+----7----+----8 *MAT_elastic $ MID RO E PR 1 7.890E-09 2.100E+05 3.000E-01 $---+----1----+----2----+----3----+----4----+----5----+----6----+----7----+----8 *PART PART PID=1 $ PID SID MID 1 1 1 $---+----1----+----2----+----3----+----4----+----5----+----6----+----7----+----8 *SECTION_SHELL $ SID ELFORM 1 16 $ T1 T2 T3 T4 2.000E+00 2.000E+00 2.000E+00 2.000E+00 $---+----1----+----2----+----3----+----4----+----5----+----6----+----7----+----8 *SET_NODE_LIST 1 1 2 4 5 7 9 11 13 15 17 18 20 27 29 36 38 45 47 54 55 56 57 58 59 60 61 62 63 $---+----1----+----2----+----3----+----4----+----5----+----6----+----7----+----8 *LOAD_SEGMENT $ LCID SF N1 N2 N3 N4 2 -1.0 1 2 3 4 2 -1 2 5 6 3 2 -1 5 7 8 6 2 -1 7 9 10 8 2 -1 9 11 12 10 2 -1 11 13 14 12 2 -1 13 15 16 14 2 -1 15 17 18 16 2 -1 4 3 19 20 2 -1 3 6 21 19 2 -1 6 8 22 21 2 -1 8 10 23 22 2 -1 10 12 24 23 2 -1 12 14 25 24 2 -1 14 16 26 25 2 -1 16 18 27 26 2 -1 20 19 28 29 2 -1 19 21 30 28 2 -1 21 22 31 30 2 -1 22 23 32 31 2 -1 23 24 33 32 2 -1 24 25 34 33 2 -1 25 26 35 34 2 -1 26 27 36 35 2 -1 29 28 37 38 2 -1 28 30 39 37 2 -1 30 31 40 39 2 -1 31 32 41 40 2 -1 32 33 42 41 2 -1 33 34 43 42 2 -1 34 35 44 43 2 -1 35 36 45 44 2 -1 38 37 46 47 2 -1 37 39 48 46 2 -1 39 40 49 48 2 -1 40 41 50 49 2 -1 41 42 51 50 2 -1 42 43 52 51 2 -1 43 44 53 52 2 -1 44 45 54 53 2 -1 47 46 55 56 2 -1 46 48 57 55 2 -1 48 49 58 57 2 -1 49 50 59 58 2 -1 50 51 60 59 2 -1 51 52 61 60 2 -1 52 53 62 61 2 -1 53 54 63 62 $---+----1----+----2----+----3----+----4----+----5----+----6----+----7----+----8 *NODE $ NODE X Y Z TC RC 1 0.160000000E+02-0.120000000E+02 0.169705639E+02 7 2 0.122099800E+02-0.120000000E+02 0.186596565E+02 7 3 0.122097101E+02-0.827690411E+01 0.205824451E+02 4 0.160000000E+02-0.829092789E+01 0.190593948E+02 7 5 0.823375320E+01-0.120000000E+02 0.198474751E+02 7 6 0.823351479E+01-0.827266407E+01 0.216663494E+02 7 0.414376497E+01-0.120000000E+02 0.205515957E+02 7 8 0.414370632E+01-0.827218723E+01 0.223139553E+02 9 0.000000000E+00-0.120000000E+02 0.207847519E+02 7 10 0.000000000E+00-0.827236557E+01 0.225292683E+02 11-0.414373159E+01-0.120000000E+02 0.205515175E+02 7 12-0.414368868E+01-0.827222347E+01 0.223139439E+02 13-0.823371696E+01-0.120000000E+02 0.198473778E+02 7 14-0.823350334E+01-0.827271080E+01 0.216663342E+02 15-0.122099590E+02-0.120000000E+02 0.186596069E+02 7 16-0.122097054E+02-0.827692890E+01 0.205824375E+02 17-0.160000000E+02-0.120000000E+02 0.169705639E+02 7 18-0.160000000E+02-0.829092789E+01 0.190593948E+02 7 19 0.122097082E+02-0.423296833E+01 0.217767353E+02 20 0.160000000E+02-0.423428011E+01 0.203487301E+02 7 21 0.823351192E+01-0.423605585E+01 0.228018322E+02 22 0.414370155E+01-0.423928928E+01 0.234173050E+02 23 0.000000000E+00-0.424059057E+01 0.236223927E+02 24-0.414369297E+01-0.423932457E+01 0.234172993E+02 25-0.823350620E+01-0.423610210E+01 0.228018246E+02 26-0.122097063E+02-0.423299313E+01 0.217767315E+02 27-0.160000000E+02-0.423428011E+01 0.203487301E+02 7 28 0.122097073E+02 0.000000000E+00 0.221843243E+02 29 0.160000000E+02 0.000000000E+00 0.207846107E+02 7 30 0.823350906E+01 0.000000000E+00 0.231919765E+02 31 0.414369726E+01 0.000000000E+00 0.237979355E+02 32 0.000000000E+00 0.000000000E+00 0.240000000E+02 33-0.414369726E+01 0.000000000E+00 0.237979355E+02 34-0.823350906E+01 0.000000000E+00 0.231919765E+02 35-0.122097073E+02 0.000000000E+00 0.221843243E+02 36-0.160000000E+02 0.000000000E+00 0.207846107E+02 7 37 0.122097063E+02 0.423299313E+01 0.217767315E+02 38 0.160000000E+02 0.423428011E+01 0.203487301E+02 7 39 0.823350620E+01 0.423610210E+01 0.228018246E+02 40 0.414369297E+01 0.423932457E+01 0.234172993E+02 41 0.000000000E+00 0.424059057E+01 0.236223927E+02 42-0.414370155E+01 0.423928928E+01 0.234173050E+02 43-0.823351192E+01 0.423605585E+01 0.228018322E+02 44-0.122097082E+02 0.423296833E+01 0.217767353E+02 45-0.160000000E+02 0.423428011E+01 0.203487301E+02 7 46 0.122097044E+02 0.827692890E+01 0.205824375E+02 47 0.160000000E+02 0.829092789E+01 0.190593948E+02 7 48 0.823350239E+01 0.827271080E+01 0.216663342E+02 49 0.414368868E+01 0.827222347E+01 0.223139439E+02 50 0.000000000E+00 0.827236557E+01 0.225292683E+02 51-0.414370632E+01 0.827218723E+01 0.223139553E+02 52-0.823351479E+01 0.827266407E+01 0.216663494E+02 53-0.122097092E+02 0.827690411E+01 0.205824451E+02 54-0.160000000E+02 0.829092789E+01 0.190593948E+02 7 55 0.122099590E+02 0.120000000E+02 0.186596069E+02 7 56 0.160000000E+02 0.120000000E+02 0.169705639E+02 7 57 0.823371696E+01 0.120000000E+02 0.198473778E+02 7 58 0.414373159E+01 0.120000000E+02 0.205515175E+02 7 59 0.000000000E+00 0.120000000E+02 0.207847519E+02 7 60-0.414376497E+01 0.120000000E+02 0.205515957E+02 7 61-0.823375320E+01 0.120000000E+02 0.198474751E+02 7 62-0.122099800E+02 0.120000000E+02 0.186596565E+02 7 63-0.160000000E+02 0.120000000E+02 0.169705639E+02 7 $---+----1----+----2----+----3----+----4----+----5----+----6----+----7----+----8 $---+----1----+----2----+----3----+----4----+----5----+----6----+----7----+----8 *ELEMENT_SHELL $ EID PID N1 N2 N3 N4 101 1 1 2 3 4 102 1 2 5 6 3 103 1 5 7 8 6 104 1 7 9 10 8 105 1 9 11 12 10 106 1 11 13 14 12 107 1 13 15 16 14 108 1 15 17 18 16 109 1 4 3 19 20 110 1 3 6 21 19 111 1 6 8 22 21 112 1 8 10 23 22 113 1 10 12 24 23 114 1 12 14 25 24 115 1 14 16 26 25 116 1 16 18 27 26 117 1 20 19 28 29 118 1 19 21 30 28 119 1 21 22 31 30 120 1 22 23 32 31 121 1 23 24 33 32 122 1 24 25 34 33 123 1 25 26 35 34 124 1 26 27 36 35 125 1 29 28 37 38 126 1 28 30 39 37 127 1 30 31 40 39 128 1 31 32 41 40 129 1 32 33 42 41 130 1 33 34 43 42 131 1 34 35 44 43 132 1 35 36 45 44 133 1 38 37 46 47 134 1 37 39 48 46 135 1 39 40 49 48 136 1 40 41 50 49 137 1 41 42 51 50 138 1 42 43 52 51 139 1 43 44 53 52 140 1 44 45 54 53 141 1 47 46 55 56 142 1 46 48 57 55 143 1 48 49 58 57 144 1 49 50 59 58 145 1 50 51 60 59 146 1 51 52 61 60 147 1 52 53 62 61 148 1 53 54 63 62 $---+----1----+----2----+----3----+----4----+----5----+----6----+----7----+----8 *END