急求，abaqus里结构分析中不收敛的问题解决方法？

material calculations failed to converge or were not attempted at one or more points.convergence is judged unlikely.请问在MSG文件中出现上面这句话，分析不收敛，大概都有哪些方面的原因，以及解决的方法。麻烦各位大佬帮帮忙。