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marc做超塑成形分析时出错 已有1人参与
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用marc2010做一个0.1mm厚的薄材的超塑成形，用的是TA15材料，为什么一提交认真就会报错退出计算，有大神知道怎么设置吗？附上退出信息，谢谢了！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 casued by the existence of rigid body modes. It may also be caused by incorrect material properties (e.g. Poisson's raitio greater tharn 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 n region where the input date for the strain energy function is invalid. In contact analysis with friction. Iack 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. 发自小木虫Android客户端 |
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