使用的ABAQUS模拟

计算中断的错误信息：

Normal cannot be computed in 8 elements. The nodal coordinates may be incorrect or the element aspect ratio may exceed 1000 to 1. The elements have been identified in element set ErrElemNormal.

64 nodes are used more than once as a slave node in *TIE keyword. These constraints are not removed either due to the presence of *CONSTRAINT CONTROLS,NO CHANGES keyword or because removing the constraints might affect the model. The nodes have been identified in node set ErrNodeOverconTieSlave.

The geometry of 8 elements is too distorted. Check the nodal coordinates or node numbering on elements identified in element set ErrElemDistorted.

The area of 6 elements is zero, small, or negative. Check coordinates or node numbering, or modify the mesh seed. The elements have been identified in element set ErrElemAreaSmallNegZero.

Error in defining normal to the element surface at a node in 8 elements. The elements have been identified in element set ErrElemShellNormal.

The yield stress must not be zero

Analysis Input File Processor exited with an error.

这个错误原因是哪呢？什么意思呢？

像ErrElemNomal、ErrElemDistored、WarnElemDistored、、、这些点的问题怎么解除呢？求大神指教