這是警告信息

***WARNING: SOLVER PROBLEM.  ZERO PIVOT WHEN PROCESSING ELEMENT 777 INSTANCE 

             PART-1-1 INTERNAL NODE 177683 D.O.F. 1

  Typically a zero pivot is associated with an overconstraint in the model. 

 However, Abaqus was not able to identify any chains of constraints that might 

 lead to an overconstraint at this node. This suggests that the model might be 

 insufficiently constrained. Please check the constraints used in this model. 

 ***WARNING: SOLVER PROBLEM.  ZERO PIVOT WHEN PROCESSING ELEMENT 777 INSTANCE 

             PART-1-1 INTERNAL NODE 177683 D.O.F. 2

  Typically a zero pivot is associated with an overconstraint in the model. 

 However, Abaqus was not able to identify any chains of constraints that might 

 lead to an overconstraint at this node. This suggests that the model might be 

 insufficiently constrained. Please check the constraints used in this model. 

我查閱了，警告的單元都是在XFEM預(yù)置裂紋的地方，此處在進(jìn)行仿真的時(shí)候是沒有施加約束的

這是什么原因？

是模型的原因嘛？還是裂紋預(yù)置的不對(duì)