裂纹的问题

vanheyto

我是用长方形来模拟裂纹的，塑性变形
warning:
The program chosen initial timestep/load-factor is arbitrary.  It is   
  necessary for the user to supply a suitable initial                    
  timestep/load-factor through the NSUB or DELTIM command for            
  convergence and overall efficiency.      
0***** process error reported by subroutine   xdslfa
       see    xdslfa abstract (ier =  -506)

0***** process error reported by subroutine   xdslsv
       see    xdslsv abstract (ier =  -702)

0***** process error reported by subroutine   xdslsl
       see    xdslsl abstract (ier =  -600)
                             
每一步都有
warning:
Node ***** on element *** is unselected.  *是数字
最后是
error:
Sparse Matrix Solver failure.  Please check the error file (file.err)   
  for possible causes.
error:
Bisection may be activated if it is a nonlinear analysis.   

牛人门，这是什么原因呀？
我是刚刚学习了ansys和《疲劳和断裂》，有一点疑问，想分析一下:@(