ANSYS接触分析接触刚度fkn

各位大神，我在做ANSYS接触分析时，发现结果不收敛，如下图所示：
请问fkn值如何修改，是变大还是变小？或者是其他的原因？
相应的错误文件如下：
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.