求助！我看message里面出现了“ Massless nodes”和“time step size”

求助！我看message里面出现了“ Massless nodes”和“ The LS-DYNA time step size should not exceed 4.646E-05 to avoid contact instabilities. If the step size is bigger then scale the penalty of the offending surface.”
该怎么设置才能解决问题？
Beginning of keyword reader 03/08/14 19:42:50
contracting memory to 1 beginning of keyword reader
expanding memory to 22160
expanding memory to 487502
expanding memory to 1432214
expanding memory to 3046214
expanding memory to 3106790
expanding memory to 3127948
expanding memory to 3345252
expanding memory to 3549380
expanding memory to 3570492
expanding memory to 3590564
expanding memory to 3610764
expanding memory to 3691150
expanding memory to 3766736
expanding memory to 4598172
expanding memory to 4673854
expanding memory to 5573710
expanding memory to 5649296
Memory required to process keyword : 5649296
contracting memory to 1 end of keyword reader
LS-DYNA will perform a structural only analysis
FenLi_Chimeny backout
ls-dyna smp.79055 s date 01/10/2013
expanding memory to 3253 material, node and element data
expanding memory to 3379 material added airbag porosity leakage
contracting memory to 3379 material properties
expanding memory to 893089 element data for composite material
expanding memory to 1573850 gradient of damage data
expanding memory to 4859970 user control for contact interfaces
contracting memory to 4859950 for boundary cond. vectorization
expanding memory to 4912750 arbitrary element numbering input
contracting memory to 4859950 thick shell int. pt. strain
expanding memory to 4864133 spc cards
expanding memory to 11674633 process element material data
expanding memory to 11676639 load curve data
contracting memory to 11675061 user_define_loading_set
expanding memory to 11675265 regularize time history data
contracting memory to 11675061 rigidwall definitions
expanding memory to 11828440 nodal constraint sets
expanding memory to 12177517 contact interfaces
expanding memory to 12329687 implicit contact 1
expanding memory to 12729561 implicit contact 2
expanding memory to 12973902 contact segment data 1
expanding memory to 13671882 contact segment data 2
expanding memory to 14425558 contact segment data 3
expanding memory to 15065371 contact definition
expanding memory to 15368154 rigid body
expanding memory to 17884678 contact friction
expanding memory to 19028125 joints
expanding memory to 19031486 body force loads 2
contracting memory to 19031486 accelerometers
expanding memory to 19031586 rigid bodies for disp. termination
contracting memory to 19031586 transformation to move nodes
expanding memory to 19182756 interfac for file
contracting memory to 19107175 thermal expansion 0
expanding memory to 19107179 flexible body 2
contracting memory to 19107179 implicit joints
expanding memory to 19107182 minimum contact gap for auto switching
expanding memory to 19307310 initialization phase
*** Warning 30128 (INI+128)
Massless nodes
The following massless nodes were found
4 5 6 7 8 9
10 11 12 13 14 15
16 17 18 19 20 21
22 23 24 25 26 27
28 29 30 31 32 33
34 35 36 604 605 606
607 608 609 610 611 612
613 614 615 616 617 618
619 620 621 622 623 624
625 626 627 628 629 630
631 632 633 634 635 636
1204 1205 1206 1207 1208 1209
1210 1211 1212 1213 1214 1215
1216 1217 1218 1219 1220 1221
1222 1223 1224 1225 1226 1227
1228 1229 1230 1231 1232 1233
1234 1235 1236 1292 1293 1294
1295 1296 1297 1298 1299 1300
1301 1302 1303 1304 1305 1306
1307 1308 1309 1310 1311 1312
1313 1314 1315 1316 1317 1318
1319 1320 1321 1322 1323 1324
1892 1893 1894 1895 1896 1897
1898 1899 1900 1901 1902 1903
1904 1905 1906 1907 1908 1909
1910 1911 1912 1913 1914 1915
1916 1917 1918 1919 1920 1921
1922 1923 1924 2492 2493 2494
2495 2496 2497 2498 2499 2500
2501 2502 2503 2504 2505 2506
2507 2508 2509 2510 2511 2512
2513 2514 2515 2516 2517 2518
2519 2520 2521 2522 2523 2524
3092 3093 3094 3095 3096 3097
3098 3099 3100 3101 3102 3103
3104 3105 3106 3107 3108 3109
3110 3111 3112 3113 3114 3115
3116 3117 3118 3119 3120 3121
3122 3123 3124 3180 3181 3182
3183 3184 3185 3186 3187 3188
3189 3190 3191 3192 3193 3194
3195 3196 3197 3198 3199 3200
3201 3202 3203 3204 3205 3206
3207 3208 3209 3210 3211 3212
3780 3781 3782 3783 3784 3785
3786 3787 3788 3789 3790 3791
3792 3793 3794 3795 3796 3797
3798 3799 3800 3801 3802 3803
3804 3805 3806 3807 3808 3809
3810 3811 3812 4380 4381 4382
4383 4384 4385 4386 4387 4388
4389 4390 4391 4392 4393 4394
4395 4396 4397 4398 4399 4400
4401 4402 4403 4404 4405 4406
4407 4408 4409 4410 4411 4412
4980 4981 4982 4983 4984 4985
4986 4987 4988 4989 4990 4991
4992 4993 4994 4995 4996 4997
4998 4999 5000 5001 5002 5003
5004 5005 5006 5007 5008 5009
5010 5011 5012 5068 5069 5070
5071 5072 5073 5074 5075 5076
5077 5078 5079 5080 5081 5082
5083 5084 5085 5086 5087 5088
5089 5090 5091 5092 5093 5094
5095 5096 5097 5098 5099 5100
5668 5669 5670 5671 5672 5673
5674 5675 5676 5677 5678 5679
5680 5681 5682 5683 5684 5685
5686 5687 5688 5689 5690 5691
5692 5693 5694 5695 5696 5697
5698 5699 5700 6268 6269 6270
6271 6272 6273 6274 6275 6276
6277 6278 6279 6280 6281 6282
6283 6284 6285 6286 6287 6288
6289 6290 6291 6292 6293 6294
6295 6296 6297 6298 6299 6300
6868 6869 6870 6871 6872 6873
6874 6875 6876 6877 6878 6879
6880 6881 6882 6883 6884 6885
6886 6887 6888 6889 6890 6891
6892 6893 6894 6895 6896 6897
6898 6899 6900 6956 6957 6958
6959 6960 6961 6962 6963 6964
6965 6966 6967 6968 6969 6970
6971 6972 6973 6974 6975 6976
6977 6978 6979 6980 6981 6982
。。。
8865 8866 8867 8868 8869 8870
8871 8872 8873 8874 8875 8876
9444 9445 9446 9447 9448 9449
9450 9451 9452 9453 9454 9455
9456 9457 9458 10044 10045 10046
10047 10048 10049 10050 10051 10052
10053 10054 10055 10056 10057 10058
10644 10645 10646 10647 10648 10649
10650 10651 10652 10653 10654 10655
10656 10657 10658 10732 10733 10734
10735 10736 10737 10738 10739 10740
10741 10742 10743 10744 10745 10746
11332 11333 11334 11335 11336 11337
11338 11339 11340 11341 11342 11343
11344 11345 11346 11932 11933 11934
11935 11936 11937 11938 11939 11940
11941 11942 11943 11944 11945 11946
12532 12533 12534 12535 12536 12537
12538 12539 12540 12541 12542 12543
12544 12545 12546 12620 12621 12622
12623 12624 12625 12626 12627 12628
12629 12630 12631 12632 12633 12634
13220 13221 13222 13223 13224 13225
13226 13227 13228 13229 13820 13821
13822 13823 13824 13825 13826 13827
13828 13829 14420 14421 14422 14423
14424 14425 14426 14427 14428 14429
14508 14509 14510 14511 14512 14513
14514 14515 14516 14517 15108 15109
15110 15111 15112 15113 15114 15115
15116 15117 15708 15709 15710 15711
15712 15713 15714 15715 15716 15717
16308 16309 16310 16311 16312 16313
16314 16315 16316 16317 16396 16397
16398 16399 16400 16401 16402 16403
16404 16405 16996 16997 16998 16999
17000 17596 17597 17598 17599 17600
18196 18197 18198 18199 18200 18284
18285 18286 18287 18288 18884 18885
18886 18887 18888 19484 19485 19486
19487 19488 20084 20085 20086 20087
20088 20172 20173 20174 20175 20176
56644 56645 56646 56647 56648 57244
57245 57246 57247 57248 57844 57845
57846 57847 57848 57932 57933 57934
57935 57936 58532 58533 58534 58535
58536 59132 59133 59134 59135 59136
59732 59733 59734 59735 59736 59820
59821 59822 59823 59824 60420 60421
60422 60423 60424 60425 60426 60427
60428 60429 61020 61021 61022 61023
。。。。
69860 69861 69862 69863 69864 69865
69866 69867 69868 69869 69870 69871
69872 69873 69874 69875 69876 69877
69878 69879 69880 69881 69882 69883
69884 69885 69886 69887 69888 69889
69890 69891 69892 70460 70461 70462
70463 70464 70465 70466 70467 70468
70469 70470 70471 70472 70473 70474
70475 70476 70477 70478 70479 70480
70481 70482 70483 70484 70485 70486
70487 70488 70489 70490 70491 70492
71060 71061 71062 71063 71064 71065
71066 71067 71068 71069 71070 71071
71072 71073 71074 71075 71076 71077
71078 71079 71080 71081 71082 71083
71084 71085 71086 71087 71088 71089
71090 71091 71092 71148 71149 71150
71151 71152 71153 71154 71155 71156
71157 71158 71159 71160 71161 71162
71163 71164 71165 71166 71167 71168
。。。
72972 72973 72974 72975 72976 72977
72978 72979 72980 73036 73037 73038
73039 73040 73041 73042 73043 73044
73045 73046 73047 73048 73049 73050
73051 73052 73053 73054 73055 73056
73057 73058 73059 73060 73061 73062
73063 73064 73065 73066 73067 73068
73636 73637 73638 73639 73640 73641
73642 73643 73644 73645 73646 73647
73648 73649 73650 73651 73652 73653
73654 73655 73656 73657 73658 73659
73660 73661 73662 73663 73664 73665
73666 73667 73668 74236 74237 74238
74239 74240 74241 74242 74243 74244
74245 74246 74247 74248 74249 74250
74251 74252 74253 74254 74255 74256
74257 74258 74259 74260 74261 74262
74263 74264 74265 74266 74267 74268
74836 74837 74838 74839 74840 74841
74842 74843 74844 74845 74846 74847
74848 74849 74850 74851 74852 74853
74854 74855 74856 74857 74858 74859
74860 74861 74862 74863 74864 74865
74866 74867 74868 74924 74925 74926
74927 74928 74929 74930 74931 74932
74933 74934 74935 74936 74937 74938
74939 74940 74941 74942 74943 74944
74945 74946 74947 74948 74949 74950
74951 74952 74953 74954 74955 74956
*** Warning 30131 (INI+131)
total number of massless nodes = 1668
slave surface of interface = 1
type = 13
surface timestep = 4.646E-05
controlling slave node ID = 600
part ID of slave node = 1
current minimum time step = 4.646E-05
slave surface of interface = 2
type = a 5
surface timestep = 2.419E-04
controlling slave node ID = 10676
part ID of slave node = 1
current minimum time step = 4.646E-05
master surface of interface = 2
type = a 5
surface timestep = 7.052E-04
controlling master node ID = 75522
part ID of master node = 4
current minimum time step = 4.646E-05
slave surface of interface = 3
type = a 5
surface timestep = 1.792E-04
controlling slave node ID = 1200
part ID of slave node = 1
current minimum time step = 4.646E-05
master surface of interface = 3
type = a 5
surface timestep = 7.052E-04
controlling master node ID = 75522
part ID of master node = 4
current minimum time step = 4.646E-05
The LS-DYNA time step size should not exceed 4.646E-05
to avoid contact instabilities. If the step size is
bigger then scale the penalty of the offending surface.
S t o r a g e a l l o c a t i o n
Memory required to begin solution : 19307310
Additional dynamically allocated memory: 7064852
Total: 26372162