ANSYS接触分析

各位大神，在ANSYS接触分析中，计算结果不收敛，如下图所示：
还有错误文件为：
One or more elements have become highly distorted.  Excessive           
distortion of elements is usually a symptom indicating the need for     
corrective action elsewhere.  Try incrementing the load more slowly     
(increase the number of substeps or decrease the time step size).  You  
may need to improve your mesh to obtain elements with better aspect     
ratios.  Also consider the behavior of materials, contact pairs,        
and/or constraint equations.  If this message appears in the first      
iteration of first substep, be sure to perform element shape checking.


不知这是什么原因引起？是否需要调整fkn值，调大还是调小？大概多少？
多谢！