求助求助！ Check for an insufficiently constrained model.
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在利用hypermesh画好单元导入ansys后计算出现如下错误是啥问题啊，该怎么解决的？？
ERROR:
A small negative equation solver pivot term has been encountered at the UZdegree of freedom of node 42747. Check for an insufficiently constrained model.
有没有遇到过同样问题的朋友啊，求帮助
chcj631 
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