$ model is driven by displacement
$ 
*KEYWORD
*comment
The attached one element model loaded to failure in fiber tension and then compressed shows the effect of KFAIL.   Stresses are output in the material coordinate system:  x-stress = fiber stress = material a-direction = global z-direction.   Here's what I observe:

KFAIL.gt.0:   When change in volume first becomes negative subsequent to element failure in fiber tension, pressure immediately is reset to zero and then increases in proportion to further change in volume according to the bulk modulus = KFAIL.   The physical basis for the compressive stress discontinuity is not obvious to me.

KFAIL.eq.0:   Compressive stresses do not undergo a discontinuity, i.e., pressure is not reset to zero when volume change becomes negative. 

Jim  11/29/11


*boundary_spc_set_birth_death
$  constrain in transverse direction at t=0.01 so that change in volume can become negative
18,,1,1
0.01
*set_node_list
18
1,2,3,4,5,6,7,8
*MAT_COMPOSITE_DAMAGE
$#     mid        ro        ea        eb        ec      prba      prca      prcb
$         1 1.4800E-4 3.7000E+6 1.2100E+7 1.7500E+6  0.300000  0.300000  0.300000
$$ isotropic
         1 1.4800E-4 3.7000E+6 3.700E+06  3.700E+6  0.300000  0.300000  0.300000
$#     gab       gbc       gca     kfail      aopt      macf
$ 3.0000E+6 5.7500E+5 4.8500E+5            0.000000  3.000000
$ 3.0000E+6 5.7500E+5 4.8500E+5     1.E7   0.000000  3.000000
$$ isotropic
 1.42e6     1.42e6    1.42e6       1.E7   0.000000  3.000000
$ 1.42e6     1.42e6    1.42e6          0   0.000000  3.000000
$#      xp        yp        zp        a1        a2        a3

$#      v1        v2        v3        d1        d2        d3      beta

$#      sc        xt        yt        yc      alph        sn       syz       szx
$ 92500.000 92500.000 1.8500E+5 1.8500E+5     0.000     0.000     0.000     0.000
 1.e9      92500.    1.e9         1.e9       0.000     1.e9     1.e9       1.e9 
*database_binary_d3thdt
10.e-5
*database_history_solid
1
*database_glstat
0.2
*TITLE
mat22.pull.english.k
*DEFINE_CURVE
$ Bolt material curve
$        i         i         f         f         f         f         i         i
$     lcid      sidr       sfa       sfo      offa      offo    dattyp
         2         0
    0.000,    48600
    0.012,    80475
    0.022,    96125
    0.032,    107174
    0.042,    115943
    0.052,    123313
    0.062,    129723
    0.072,    135429
    0.082,    140591
    0.092,    145319
    0.102,    149692
    0.112,    153767
    0.122,    157590
    0.132,    161194
    0.142,    164608
    0.152,    167854
    0.162,    170951
    0.172,    173914
    0.182,    176755
    0.192,    179488
    0.202,    182120
    0.212,    184661
    0.222,    187117
    0.232,    189496
    0.242,    191802
    0.252,    194041
    0.262,    196217
    0.272,    198335
    0.282,    200398
    0.292,    202409
    0.302,    204372
    0.312,    206289
    0.322,    208162
    0.332,    209994
    0.342,    211787
    0.352,    213543
    0.362,    215264
    0.372,    216951
    0.382,    218606
*define_curve
13
0,45600
0.006,47000
0.012,55000
0.132616, 89965.83
*DEFINE_CURVE
$ Plate material curve
$        i         i         f         f         f         f         i         i$     lcid      sidr       sfa       sfo      offa      offo    dattyp
         3         0
0, 45600
0.002837, 45603.43
0.002858, 45706.18
0.002892, 45800.74
0.002932, 45881.94
0.002965, 45933.79
0.002994, 45997.75
0.003023, 46067.36
0.003062, 46114.62
0.003090, 46155.22
0.003124, 46183.74
0.003152, 46243.01
0.003189, 46285.72
0.003215, 46310.08
0.003245, 46348.11
0.003280, 46372.66
0.003314, 46400.40
0.003330, 46358.57
0.003355, 46377.35
0.003386, 46405.76
0.003419, 46438.18
0.003443, 46473.96
0.003476, 46527.19
0.003514, 46600.99
0.003549, 46667.11
0.003589, 46737.11
0.003626, 46805.92
0.003679, 46879.67
0.003719, 46906.83
0.003746, 46930.09
0.003780, 46976.64
0.003812, 47026.31
0.003844, 47073.05
0.003877, 47125.57
0.003925, 47208.56
0.003947, 47240.95
0.003985, 47277.60
0.004011, 47332.01
0.004047, 47384.06
0.004080, 47441.37
0.004113, 47488.56
0.004152, 47538.66
0.004188, 47579.05
0.004222, 47617.58
0.004265, 47656.64
0.004297, 47691.77
0.004332, 47704.93
0.004368, 47739.16
0.004404, 47770.38
0.004449, 47809.89
0.004481, 47826.28
0.004495, 47847.52
0.004524, 47898.17
0.004568, 47956.96
0.004592, 47995.21
0.004619, 48011.24
0.004656, 48063.33
0.004694, 48114.97
0.004730, 48146.60
0.004770, 48178.65
0.004801, 48211.26
0.004846, 48223.33
0.004878, 48246.13
0.004903, 48253.61
0.004940, 48292.52
0.004972, 48310.73
0.005007, 48336.21
0.005036, 48374.03
0.005074, 48402.15
0.005103, 48437.11
0.005139, 48469.77
0.005153, 48497.49
0.005194, 48542.88
0.005228, 48601.88
0.005264, 48625.77
0.005299, 48649.46
0.005330, 48698.23
0.005363, 48733.08
0.005408, 48766.40
0.005447, 48792.78
0.005471, 48790.18
0.005494, 48818.39
0.005530, 48878.13
0.005566, 48908.75
0.005606, 48957.74
0.005644, 48988.30
0.005684, 49016.83
0.005706, 49042.69
0.005743, 49065.95
0.005780, 49082.42
0.005806, 49110.77
0.005840, 49134.03
0.005868, 49166.02
0.005892, 49199.63
0.005918, 49212.83
0.005941, 49269.66
0.005988, 49357.25
0.006019, 49384.23
0.006060, 49420.97
0.006099, 49444.59
0.006141, 49467.80
0.006167, 49472.41
0.006207, 49496.50
0.006235, 49512.54
0.006264, 49536.64
0.006293, 49575.10
0.006321, 49601.29
0.006354, 49661.99
0.006396, 49696.03
0.006433, 49733.01
0.006459, 49762.27
0.006498, 49792.10
0.006532, 49815.10
0.006557, 49828.69
0.006592, 49867.58
0.006627, 49902.77
0.006658, 49935.13
0.006693, 49960.09
0.006729, 49988.55
0.006758, 50016.03
0.006790, 50052.17
0.006837, 50086.11
0.006873, 50114.14
0.006906, 50143.17
0.006940, 50152.28
0.006967, 50170.07
0.006995, 50193.64
0.007026, 50224.54
0.007057, 50271.32
0.007095, 50295.39
0.007120, 50325.05
0.007147, 50354.54
0.007180, 50409.09
0.007202, 50429.39
0.007235, 50466.31
0.007280, 50515.66
0.007310, 50547.76
0.007354, 50574.11
0.007396, 50625.93
0.007425, 50625.14
0.007461, 50638.66
0.007494, 50650.87
0.007524, 50680.42
0.007553, 50714.86
0.007580, 50738.56
0.007614, 50778.57
0.007649, 50809.58
0.007679, 50851.21
0.007709, 50870.03
0.007747, 50921.28
0.007785, 50954.62
0.007831, 50966.67
0.007858, 50986.70
0.007884, 51005.52
0.007919, 51020.30
0.007945, 51044.69
0.007979, 51086.25
0.008005, 51114.16
0.008037, 51159.85
0.008063, 51204.92
0.008096, 51254.24
0.008140, 51291.74
0.008181, 51327.64
0.008220, 51342.29
0.008256, 51347.25
0.008286, 51365.09
0.008311, 51379.10
0.008347, 51408.88
0.008375, 51427.80
0.008415, 51468.36
0.008443, 51510.43
0.008474, 51540.93
0.008495, 51483.21
0.008527, 51551.73
0.008562, 51596.02
0.008594, 51636.98
0.008629, 51682.79
0.008670, 51711.14
0.008714, 51736.55
0.008745, 51741.70
0.008771, 51759.61
0.008803, 51786.80
0.008836, 51814.29
0.008872, 51830.61
0.008907, 51865.59
0.008939, 51910.19
0.008966, 51932.81
0.008997, 51948.70
0.009038, 51991.17
0.009069, 52018.61
0.009103, 52037.90
0.009130, 52064.52
0.009152, 52086.16
0.009193, 52122.30
0.009234, 52167.42
0.009266, 52205.44
0.009292, 52227.31
0.009323, 52263.14
0.009361, 52299.40
0.009396, 52322.44
0.009434, 52346.96
0.009470, 52380.28
0.009502, 52412.51
0.009533, 52432.37
0.009563, 52469.82
0.009594, 52489.05
0.009634, 52506.94
0.009660, 52532.38
0.009689, 52562.71
0.009729, 52591.66
0.009755, 52618.06
0.009779, 52634.94
0.009814, 52655.67
0.009847, 52683.76
0.009884, 52730.60
0.009911, 52765.53
0.009950, 52784.58
0.009981, 52820.50
0.010004, 52854.93
0.010044, 52891.74
0.010082, 52923.80
0.010123, 52963.81
0.010156, 52996.14
0.010186, 53013.40
0.010233, 53034.61
0.010263, 53055.43
0.010297, 53068.59
0.010332, 53084.94
0.010358, 53088.25
0.010394, 53122.47
0.010416, 53132.18
0.010450, 53166.79
0.010475, 53202.45
0.010511, 53249.49
0.010547, 53292.38
0.010584, 53314.23
0.010623, 53346.97
0.010651, 53364.99
0.010683, 53393.98
0.010727, 53425.63
0.010759, 53440.08
0.010787, 53470.41
0.010815, 53491.40
0.010837, 53515.35
0.010865, 53543.36
0.010905, 53598.69
0.010942, 53630.80
0.010963, 53654.38
0.010998, 53692.92
0.011041, 53723.02
0.011060, 53718.02
0.011110, 53768.37
0.011134, 53784.19
0.011164, 53811.36
0.011201, 53851.11
0.011239, 53873.57
0.011276, 53888.27
0.011297, 53918.82
0.011336, 53938.69
0.011362, 53970.54
0.011400, 54013.78
0.011437, 54029.11
0.011477, 54073.33
0.011515, 54096.99
0.011556, 54109.66
0.011583, 54120.97
0.011605, 54118.50
0.011634, 54140.81
0.011665, 54161.01
0.011700, 54203.72
0.011734, 54234.46
0.011769, 54269.86
0.011796, 54296.33
0.011830, 54332.53
0.011874, 54353.48
0.011909, 54381.63
0.011936, 54407.76
0.011964, 54431.35
0.011989, 54439.03
0.012026, 54482.55
0.012054, 54493.60
0.012087, 54533.35
0.012121, 54570.76
0.012150, 54586.46
0.012181, 54617.36
0.012221, 54645.87
0.012249, 54664.34
0.012288, 54716.76
0.012319, 54751.65
0.012343, 54762.65
0.012376, 54792.86
0.012417, 54806.98
0.012450, 54830.63
0.012488, 54863.03
0.012557, 54892.46
0.012571, 54915.21
0.012648, 54949.32
0.012653, 54964.45
0.012653, 54990.15
0.012653, 55020.45
0.012735, 55037.94
0.012736, 55069.39
0.012808, 55088.59
0.012818, 55109.91
$0.012818, 55128.38  starts duplicating strain values - Not allowed!
0.012897, 55165.07
0.012901, 55197.93
0.012982, 55223.31
0.012983, 55245.88
$0.012983, 55258.26
$0.012983, 55280.83
0.013066, 55312.63
0.013066, 55345.76
0.013148, 55380.85
0.013148, 55393.58
0.013148, 55424.36
0.013231, 55447.95
0.013274, 55472.37
0.013313, 55505.44
0.013313, 55561.03
0.013468, 55960.92
0.013641, 56395.47
0.013962, 56674.53
0.014303, 56946.89
0.014738, 57253.91
0.015194, 57576.15
0.015644, 57871.45
0.016088, 58223.57
0.016578, 58595.61
0.017108, 58991.99
0.017699, 59382.87
0.018268, 59740.09
0.018859, 60102.97
0.019393, 60448.23
0.019896, 60792.45
0.020416, 61160.07
0.020936, 61518.69
0.021492, 61859.89
0.022360, 62355.14
0.022929, 62695.58
0.023439, 62989.87
0.023945, 63328.99
0.024494, 63649.36
0.025097, 63948.25
0.025724, 64231.51
0.026305, 64514.13
0.026830, 64779.84
0.027288, 65082.14
0.027764, 65400.05
0.028283, 65705.53
0.028830, 65994.61
0.029372, 66277.70
0.029921, 66569.95
0.030454, 66853.12
0.031000, 67135.16
0.031556, 67401.03
0.032095, 67676.04
0.032620, 67956.93
0.033176, 68224.61
0.033700, 68486.64
0.034241, 68744.07
0.034788, 68987.64
0.035290, 69255.54
0.035798, 69513.96
0.036340, 69768.46
0.036891, 70014.49
0.037442, 70265.99
0.038008, 70497.72
0.038561, 70725.92
0.039137, 70964.76
0.039720, 71187.09
0.040289, 71394.18
0.040776, 71606.95
0.041265, 71826.59
0.041768, 72045.02
0.042285, 72277.47
0.042858, 72492.03
0.043410, 72676.43
0.043888, 72889.35
0.044416, 73104.80
0.044929, 73314.57
0.045502, 73516.01
0.046075, 73699.31
0.046649, 73890.15
0.047155, 74078.74
0.047653, 74271.17
0.048158, 74460.21
0.048632, 74668.88
0.049158, 74863.35
0.049707, 75056.83
0.050236, 75243.34
0.050801, 75429.02
0.051353, 75597.22
0.051907, 75764.23
0.052425, 75930.73
0.052959, 76095.09
0.053480, 76279.25
0.053978, 76450.48
0.054495, 76626.41
0.055014, 76791.49
0.055550, 76951.89
0.056077, 77124.88
0.056645, 77280.26
0.057177, 77437.70
0.057745, 77581.31
0.058263, 77722.47
0.058750, 77881.24
0.059225, 78056.89
0.059744, 78201.18
0.060282, 78351.70
0.060792, 78490.29
0.061322, 78646.12
0.061861, 78801.84
0.062390, 78938.21
0.062965, 79057.21
0.063493, 79192.29
0.063990, 79320.37
0.064479, 79640.79
0.064995, 79810.76
0.065500, 79937.57
0.066011, 80056.78
0.066497, 80180.58
0.066977, 80332.37
0.067520, 80484.56
0.068068, 80613.50
0.068648, 80736.17
0.069214, 80827.60
0.069725, 80950.85
0.070250, 81064.87
0.070767, 81183.72
0.071275, 81314.44
0.071810, 81424.90
0.072345, 81534.04
0.072902, 81627.73
0.073433, 81742.23
0.073886, 81873.26
0.074365, 81982.59
0.074901, 82094.82
0.075462, 82194.61
0.076020, 82293.47
0.076533, 82381.56
0.076999, 82503.95
0.077479, 82614.63
0.077984, 82731.22
0.078481, 82820.20
0.078982, 82928.15
0.079478, 83043.49
0.079988, 83159.06
0.080516, 83247.42
0.081028, 83351.56
0.081562, 83463.67
0.082091, 83552.04
0.082592, 83659.60
0.083102, 83741.67
0.083630, 83831.48
0.084133, 83923.87
0.084685, 84008.29
0.085207, 84082.74
0.085694, 84171.25
0.086201, 84266.03
0.086702, 84358.26
0.087187, 84478.63
0.087709, 84551.07
0.088227, 84666.85
0.088710, 84742.54
0.089278, 84846.21
0.089797, 84884.36
0.090300, 84979.14
0.090815, 85070.28
0.091309, 85136.62
0.091827, 85211.90
0.092328, 85300.88
0.092825, 85389.39
0.093331, 85456.20
0.093842, 85548.73
0.094353, 85624.81
0.094873, 85682.32
0.095366, 85756.01
0.095843, 85853.67
0.096314, 85943.55
0.096807, 86026.73
0.097348, 86093.67
0.097850, 86136.93
0.098395, 86239.46
0.098905, 86303.03
0.099405, 86352.13
0.099881, 86457.43
0.100388, 86488.49
0.100857, 86580.41
0.101365, 86666.71
0.101917, 86730.89
0.102460, 86779.40
0.102977, 86829.01
0.103471, 86884.98
0.103941, 86971.80
0.104404, 87063.00
0.104927, 87140.88
0.105438, 87176.88
0.105962, 87237.15
0.106454, 87299.69
0.106924, 87346.58
0.107382, 87449.77
0.107901, 87520.17
0.108425, 87572.07
0.108981, 87611.23
0.109508, 87654.57
0.110037, 87712.46
0.110528, 87744.76
0.110999, 87809.58
0.111463, 87871.27
0.111947, 87943.54
0.112433, 88017.84
0.112901, 88064.10
0.113393, 88126.59
0.113928, 88190.26
0.114454, 88250.83
0.114961, 88284.71
0.115426, 88334.27
0.115901, 88412.45
0.116373, 88470.83
0.116873, 88516.45
0.117357, 88566.07
0.117853, 88633.03
0.118365, 88679.66
0.118835, 88748.38
0.119321, 88801.64
0.119854, 88857.12
0.120378, 88894.34
0.120891, 88920.57
0.121369, 88947.88
0.121856, 89018.85
0.122333, 89068.26
0.122830, 89129.05
0.123306, 89170.53
0.123789, 89212.04
0.124289, 89250.96
0.124754, 89297.49
0.125210, 89370.47
0.125704, 89431.56
0.126218, 89457.60
0.126736, 89488.06
0.127262, 89519.72
0.127742, 89562.26
0.128258, 89611.94
0.128745, 89649.88
0.129254, 89690.23
0.129729, 89742.97
0.130214, 89767.07
0.130707, 89802.41
0.131183, 89859.78
0.131680, 89906.19
0.132155, 89904.39
0.132616, 89965.83
$
$
*CONTROL_TERMINATION
$...>....1....>....2....>....3....>....4....>....5....>....6....>....7....>....8
$   endtim    endcyc     dtmin    endneg    endmas
0.02
$
*CONTROL_TIMESTEP
$...>....1....>....2....>....3....>....4....>....5....>....6....>....7....>....8
$   dtinit      scft      isdo    tslimt      dtms      lctm     erode     ms1st
                 .10            
$
$
*DEFINE_CURVE
$     lcid      sidr      scla      sclo      offa      offo
         5
$           abscissa            ordinate
                 0.0               0.001 
               100.0               0.001 
$
$
*CONTROL_ENERGY
$     hgen      rwen    slnten     rylen
         2         2
$
*CONTROL_OUTPUT
$    npopt    neecho    nrefup    iaccop     opifs    ipnint    ikedit
                1000
$
$
*DATABASE_BINARY_D3PLOT
$  dt/cycl      lcdt
     10e-5
$
*DATABASE_EXTENT_BINARY
$    neiph     neips    maxint    strflg    sigflg    epsflg    rltflg    engflg
         3                             1
$
$   cmpflg    ieverp    beamip
1
$
$
$
$
$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
$
$$$$  Define Cross Sections
$
$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
$
$
*DATABASE_SECFORC
$  dt/cycl      lcdt
       0.1
$
$...>....1....>....2....>....3....>....4....>....5....>....6....>....7....>....8
$
*DATABASE_CROSS_SECTION_PLANE
$        i
$     psid       xct       yct       zct       xch       ych       zch
         0       0.0       0.0       1.0       0.0       0.0       5.0
$     xhev      yhev      xhev      lenl      lenm
       1.0       0.0       1.0
$
$
$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
$
$$$$  Boundary Motion Conditions
$
$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
$
$...>....1....>....2....>....3....>....4....>....5....>....6....>....7....>....8
$
*BOUNDARY_PRESCRIBED_MOTION_SET
$      nid       dof       vad      lcid        sf       vid
         1         3         2         1       1.0         0
$
*DEFINE_CURVE
$     lcid      sidr      scla      sclo      offa      offo
         1 
0,0
0.005,.3
0.01,0
0.02,-.4
1.00,-.4
*SET_NODE_LIST
$      sid       da1       da2       da3       da4
         1
$
$     nid1      nid2      nid3      nid4      nid5      nid6      nid7      nid8
         5         6         7         8
$
$
$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
$
$$$$  Define Parts and Materials
$
$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
$
$...>....1....>....2....>....3....>....4....>....5....>....6....>....7....>....8
$
*PART
Solid Element
$      pid       sid       mid     eosid      hgid    adpopt
         1         1         1         0         0         0
$
$
$
*SECTION_SOLID
$      sid    elform 
         1
$ 
$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
$
$$$$  Define Nodes and Elements
$
$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
$
$
*NODE
$     i8               f               f               f       i       i
$   node               x               y               z      tc      rc
       1             0.0             0.0             0.0       3       7
       2            10.0             0.0             0.0       3       7
       3             0.0            10.0             0.0       3       7
       4            10.0            10.0             0.0       3       7
       5             0.0             0.0            10.0       0       7
       6            10.0             0.0            10.0       0       7
       7             0.0            10.0            10.0       0       7
       8            10.0            10.0            10.0       0       7
*ELEMENT_SOLID
$      i       i       i       i       i       i       i       i       i       i
$    eid     pid      n1      n2      n3      n4      n5      n6      n7      n8
       1       1       1       2       4       3       5       6       8       7
$
*END