采用子程序实现单元删除。子程序采用定义场变量、状态的方式，通过判断单元应力是否达到规定的限值，从而实现单元的删除。有需要的可以下载(Subroutine is used to implement cell deletion. Subroutine to define the field variable, the state of the way, by determining whether the unit stress reaches the specified limit, in ord