求助，abaqus模型不收敛，矩阵有大量负特征值什么原因？

The system matrix has 24249 negative eigenvalues.

The system matrix has 94131 negative eigenvalues.

Excessive distortion at a total of 41177 integration points in solid (continuum) elements

The system matrix has 101 negative eigenvalues.

The system matrix has 40626 negative eigenvalues.

Excessive distortion at a total of 34586 integration points in solid (continuum) elements

FORCE equilibrium accepted using the alternate tolerance.