【讨论】单元发生distorting的问题！（非线性计算）

zjd819

在分析中有诸多如下的warning最终导致分析中止，由于模型的原因，有部分单元肯定存在 distort，但下面的单元不是那些单元，这就说明过程中变形太大，单元变形甚至成凹单元，以至于非线性分析错误，哪位大牛有如下经历，想问一下大家是如何理解这种问题并解决的？谢谢！
  
  ***WARNING: ELEMENT 19 IS DISTORTING SO MUCH THAT IT TURNS INSIDE OUT
  
  ***WARNING: ELEMENT 19 IS DISTORTING SO MUCH THAT IT TURNS INSIDE OUT
  
  ***WARNING: ELEMENT 20 IS DISTORTING SO MUCH THAT IT TURNS INSIDE OUT
  
  ***WARNING: ELEMENT 20 IS DISTORTING SO MUCH THAT IT TURNS INSIDE OUT
  
  ***WARNING: ELEMENT 20 IS DISTORTING SO MUCH THAT IT TURNS INSIDE OUT
  
  ***WARNING: ELEMENT 20 IS DISTORTING SO MUCH THAT IT TURNS INSIDE OUT
  
  ***WARNING: 2 elements are distorting so much that they turn inside out. The  
             elements have been identified in element set  
             WarnElemDistInOutStep3Inc1.
  
  ***WARNING: EXCESSIVE DISTORTION AT A TOTAL OF 6 INTEGRATION POINTS IN SOLID  
             (CONTINUUM) ELEMENTS
  
  ***WARNING: CONVERGENCE JUDGED UNLIKELY.  INCREMENT WILL BE ATTEMPTED AGAIN  
             WITH A TIME INCREMENT OF 3.90625E-08
  
  ***ERROR: TOO MANY ATTEMPTS MADE FOR THIS INCREMENT: ANALYSIS TERMINATED

zhangpeiwen

  我计算的题目也出现同样的warning,
如果不收敛，可以改变材料的参数，
我的用ansys做的前处理，然后用abaqus计算，
ansys中网格检查很好，到了abaqus中出现警告，呵呵
  不明白了

zxhst

我在explicit中也遇到过类似问题
当时是因为用的自动时间增量
后来用direct user control 将时间步长缩小
就没有这个问题了