请问求解信息里的factor done、iteration是什么含义？ 100

workbench计算摩擦接触出错，在solution information显示如下的信息，进行了模态分析也无刚体位移。

下面的factor done  、factor wall sec是什么意思？

iteration= 50，iteration= 200……是什么迭代次数？每次计算的最大值超过10000时计算就会停止。

求解信息：

ALL CURRENT ANSYS DATA WRITTEN TO FILE NAME= file.rdb

  FOR POSSIBLE RESUME FROM THIS POINT

     FORCE CONVERGENCE VALUE  =   906.6      CRITERION=   4.626    

 curEqn=  10226  totEqn=  52158 Job CP sec=    816.953

      Factor Done=  51% Factor Wall sec=      1.096 rate=   18380.8 Mflops

 curEqn=  52158  totEqn=  52158 Job CP sec=    818.250

      Factor Done= 100% Factor Wall sec=      2.381 rate=   16466.6 Mflops

 Iteration=    50 Ratio=  0.269692     Limit=  1.000000E-08 Wall=    31.6

 Iteration=   200 Ratio=  6.738305E-03 Limit=  1.000000E-08 Wall=   127.4

 Iteration=   305 Ratio=  6.106417E-03 Limit=  1.000000E-08 Wall=   196.0

 Iteration=   430 Ratio=  4.174049E-03 Limit=  1.000000E-08 Wall=   270.0

 Iteration=   540 Ratio=  2.124856E-03 Limit=  1.000000E-08 Wall=   333.5

 Iteration=   665 Ratio=  9.778559E-04 Limit=  1.000000E-08 Wall=   411.5

 Iteration=   800 Ratio=  8.030546E-04 Limit=  1.000000E-08 Wall=   491.3

 Iteration=   915 Ratio=  1.048803E-03 Limit=  1.000000E-08 Wall=   566.0

 Iteration=  1015 Ratio=  9.129023E-04 Limit=  1.000000E-08 Wall=   629.9

 Iteration=  1120 Ratio=  9.211939E-04 Limit=  1.000000E-08 Wall=   693.2

 Iteration=  1250 Ratio=  5.983734E-04 Limit=  1.000000E-08 Wall=   773.7

 Iteration=  1355 Ratio=  5.057380E-04 Limit=  1.000000E-08 Wall=   837.4

 Iteration=  1495 Ratio=  4.655985E-04 Limit=  1.000000E-08 Wall=   922.5

 Iteration=  1615 Ratio=  5.364324E-04 Limit=  1.000000E-08 Wall=   996.2

 Iteration=  1730 Ratio=  5.414109E-04 Limit=  1.000000E-08 Wall=  1064.8

 Iteration=  1840 Ratio=  6.191253E-04 Limit=  1.000000E-08 Wall=  1134.1

 Iteration=  1975 Ratio=  7.340327E-04 Limit=  1.000000E-08 Wall=  1213.8

 Iteration=  2105 Ratio=  1.100255E-03 Limit=  1.000000E-08 Wall=  1294.0

 Iteration=  2225 Ratio=  1.152556E-03 Limit=  1.000000E-08 Wall=  1362.7

 Iteration=  2330 Ratio=  8.898080E-04 Limit=  1.000000E-08 Wall=  1426.8

 Iteration=  2480 Ratio=  6.636647E-04 Limit=  1.000000E-08 Wall=  1517.3

 Iteration=  2600 Ratio=  6.451836E-04 Limit=  1.000000E-08 Wall=  1587.5

 Iteration=  2705 Ratio=  6.578533E-04 Limit=  1.000000E-08 Wall=  1651.8

 Iteration=  2845 Ratio=  9.306061E-04 Limit=  1.000000E-08 Wall=  1731.1

 Iteration=  2990 Ratio=  9.056706E-04 Limit=  1.000000E-08 Wall=  1814.8

 Iteration=  3100 Ratio=  6.710041E-04 Limit=  1.000000E-08 Wall=  1884.0

 Iteration=  3245 Ratio=  6.270252E-04 Limit=  1.000000E-08 Wall=  1968.3

 Iteration=  3350 Ratio=  4.035502E-04 Limit=  1.000000E-08 Wall=  2031.6

 Iteration=  3475 Ratio=  3.864710E-04 Limit=  1.000000E-08 Wall=  2100.6

 Iteration=  3580 Ratio=  2.642042E-04 Limit=  1.000000E-08 Wall=  2164.9

 Iteration=  3700 Ratio=  2.026610E-04 Limit=  1.000000E-08 Wall=  2234.4

 Iteration=  3870 Ratio=  1.096759E-04 Limit=  1.000000E-08 Wall=  2335.9

 Iteration=  3980 Ratio=  1.281192E-04 Limit=  1.000000E-08 Wall=  2405.0

 Iteration=  4110 Ratio=  9.785912E-05 Limit=  1.000000E-08 Wall=  2479.0

 Iteration=  4220 Ratio=  1.111910E-04 Limit=  1.000000E-08 Wall=  2548.7

 Iteration=  4375 Ratio=  1.095050E-04 Limit=  1.000000E-08 Wall=  2639.9

 Iteration=  4545 Ratio=  9.951039E-05 Limit=  1.000000E-08 Wall=  2740.6

 Iteration=  4660 Ratio=  9.880312E-05 Limit=  1.000000E-08 Wall=  2810.1

 Iteration=  4775 Ratio=  4.418635E-05 Limit=  1.000000E-08 Wall=  2874.0

 Iteration=  4910 Ratio=  3.825693E-05 Limit=  1.000000E-08 Wall=  2958.9

 Iteration=  5020 Ratio=  3.546789E-05 Limit=  1.000000E-08 Wall=  3022.9

 Iteration=  5140 Ratio=  3.091011E-05 Limit=  1.000000E-08 Wall=  3097.3

 Iteration=  5275 Ratio=  2.309499E-05 Limit=  1.000000E-08 Wall=  3176.2

 Iteration=  5385 Ratio=  1.800530E-05 Limit=  1.000000E-08 Wall=  3245.8

 Iteration=  5490 Ratio=  1.105920E-05 Limit=  1.000000E-08 Wall=  3309.4

 Iteration=  5600 Ratio=  6.978516E-06 Limit=  1.000000E-08 Wall=  3373.0

 Iteration=  5760 Ratio=  5.216504E-06 Limit=  1.000000E-08 Wall=  3469.3

 Iteration=  5870 Ratio=  6.270397E-06 Limit=  1.000000E-08 Wall=  3538.0

 Iteration=  5990 Ratio=  7.544599E-06 Limit=  1.000000E-08 Wall=  3606.8

 Iteration=  6135 Ratio=  9.868292E-06 Limit=  1.000000E-08 Wall=  3696.3

 Iteration=  6250 Ratio=  1.936087E-05 Limit=  1.000000E-08 Wall=  3759.6

 Iteration=  6395 Ratio=  2.067678E-05 Limit=  1.000000E-08 Wall=  3850.4

 Iteration=  6510 Ratio=  2.668374E-05 Limit=  1.000000E-08 Wall=  3918.5

 Iteration=  6640 Ratio=  2.386096E-05 Limit=  1.000000E-08 Wall=  3998.4

 Iteration=  6800 Ratio=  2.185109E-05 Limit=  1.000000E-08 Wall=  4095.2

 Iteration=  6965 Ratio=  1.309505E-05 Limit=  1.000000E-08 Wall=  4191.3

 Iteration=  7105 Ratio=  1.332866E-05 Limit=  1.000000E-08 Wall=  4277.5

 Iteration=  7230 Ratio=  1.102703E-05 Limit=  1.000000E-08 Wall=  4351.6

 Iteration=  7440 Ratio=  1.172654E-05 Limit=  1.000000E-08 Wall=  4478.6

 Iteration=  7550 Ratio=  1.079676E-05 Limit=  1.000000E-08 Wall=  4547.3

 Iteration=  7665 Ratio=  1.139142E-05 Limit=  1.000000E-08 Wall=  4610.4

 Iteration=  7820 Ratio=  8.735977E-06 Limit=  1.000000E-08 Wall=  4709.0

 Iteration=  8030 Ratio=  6.025503E-06 Limit=  1.000000E-08 Wall=  4836.4

 Iteration=  8195 Ratio=  6.358263E-06 Limit=  1.000000E-08 Wall=  4932.8

 Iteration=  8335 Ratio=  8.454074E-06 Limit=  1.000000E-08 Wall=  5018.7

 Iteration=  8470 Ratio=  1.056678E-05 Limit=  1.000000E-08 Wall=  5098.7

 Iteration=  8570 Ratio=  1.049369E-05 Limit=  1.000000E-08 Wall=  5163.4

 Iteration=  8715 Ratio=  7.011649E-06 Limit=  1.000000E-08 Wall=  5247.9

 Iteration=  8905 Ratio=  8.176408E-06 Limit=  1.000000E-08 Wall=  5364.0

 Iteration=  9025 Ratio=  1.028839E-05 Limit=  1.000000E-08 Wall=  5432.5

 Iteration=  9125 Ratio=  1.408158E-05 Limit=  1.000000E-08 Wall=  5496.4

 Iteration=  9230 Ratio=  1.500275E-05 Limit=  1.000000E-08 Wall=  5560.7

 Iteration=  9355 Ratio=  1.477117E-05 Limit=  1.000000E-08 Wall=  5635.9

 Iteration=  9460 Ratio=  1.830739E-05 Limit=  1.000000E-08 Wall=  5699.2

 Iteration=  9570 Ratio=  2.257608E-05 Limit=  1.000000E-08 Wall=  5767.8

 Iteration=  9680 Ratio=  2.018783E-05 Limit=  1.000000E-08 Wall=  5835.9

 Iteration=  9795 Ratio=  2.607978E-05 Limit=  1.000000E-08 Wall=  5905.5

 Iteration=  9895 Ratio=  2.061551E-05 Limit=  1.000000E-08 Wall=  5969.5

 *** ERROR ***                           CP =    6859.078   TIME= 13:25:27

 The preconditioned conjugate gradient solver failed with an error code  

 of 1.  Please check for an insufficiently constrained model.            

 Switching to the sparse direct model may allow this nonlinear analysis  

 to continue beyond this point.