SimWe仿真论坛 » B04：MSC.Marc » 这个错误信息怎么改？

w_xycsu 发表于 2008-4-9 22:43

这个错误信息怎么改？

我在做板带轧制时候遇到的问题，提交没错误，但是却运行不了，一下子就结束了，哪位高手知道该怎样改？感激！

The determinant of the stiffness matrix becomes zero or
             negative when indicated node has been reached during the
             Gaussian elimination phase of the solution process. This
             means that the stiffness matrix is non-positive definite.
             If this happens at the start of the analysis, the condition
             is usually caused by the existence of rigid body modes.  It
             may also be caused by incorrect material properties (e.g.
             Poisson's ratio greater than 0.5; note that such situations
             may arise through temperature dependence of properties). In
             nonlinear cases, the structure may have buckled or reached a
             plastic limit load. In rubber analysis, it may also be due
             to the strain state being in a region where the input data
             for the strain energy function is invalid. In contact
             analysis with friction, lack of normal forces may result in
             friction being absent. If desired, the program may be forced
             to continue by use of the parameter PRINT or the model or
             history definition option CONTROL. Either one of these
             procedures may be used for restart. Whenever a non-positive
             definite situation occurs one must exercise caution, as the
             resultant numerical solution may be infeasible.

brucekang 发表于 2008-4-10 08:22

你看看有没有缺约束条件。其它的就看外文提示了。

w_xycsu 发表于 2008-4-10 12:37

谢谢帮助，我再试试看:)

liulangtiany 发表于 2008-4-10 21:37

可能原因
1）单元划分不好；
2）变形太大；
3）边界错误

zhuran 发表于 2008-4-12 20:07

打开NON-POSITIVE,PROCEED WHEN NOT CONVEGENCE,适合弧度法

w_xycsu 发表于 2008-4-13 00:36

谢谢各位 问题已解决

brucekang 发表于 2008-4-13 15:25

分享一个经验吧。

w_xycsu 发表于 2008-4-18 11:18

在out文件中查找error  就可以知道哪错了 然后根据你自己的情况改啊

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