求助：一个弹塑性接触问题的错误

bihanbing

Rigid body reference nodes will not be repositioned if the reference node is part of the connectivity of one or more elements. Repositioning such nodes may distort the elements associated with the node. Such reference nodes have been identified in node set WarnNodeRefNoReposDistortStep1Inc0.
The system matrix has 1 negative eigenvalues.
Solver problem. Zero pivot when processing D.O.F. 1 of 49 nodes. The nodes have been identified in node set WarnNodeSolvProbZeroPiv_1_1_1_1_1.
The system matrix has 3 negative eigenvalues.
The system matrix has 5 negative eigenvalues.
The system matrix has 4 negative eigenvalues.
The system matrix has 2 negative eigenvalues.
The system matrix has 4 negative eigenvalues.
The system matrix has 5 negative eigenvalues.
The system matrix has 8 negative eigenvalues.
The system matrix has 4 negative eigenvalues.
The system matrix has 5 negative eigenvalues.

我在assembly中定义了参考点，不知问题出在哪里？

zhangmeng

节点49的自由度1有问题，过约束或未约束

bihanbing

谢谢zhangmeng,正在努力解决。