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Analysis has failed to converge to required convergence tolerances. One of several error conditions has been detected and the run aborted. The output will specify additional messages.
ー解析が収束許容値に収束しなかったー
The determinant of the stiffness matrix becomes zero ornegative when indicated node has been reached during the Gaussian elimination phase of the solution process. Thismeans that the stiffness matrix is non-positive definite. If this happens at the start of the analysis, the conditionis 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). Innonlinear cases, the structure may have buckled or reached a plastic limit load. In rubber analysis, it may also be dueto the strain state being in a region where the input data for the strain energy function is invalid. In contactanalysis with friction, lack of normal forces may result in friction being absent. If desired, the program may be forcedto continue by use of the parameter PRINT or the model or history definition option CONTROL. Either one of theseprocedures may be used for restart. Whenever a non-positive definite situation occurs one must exercise caution, as theresultant numerical solution may be infeasible.
ー剛性マトリックスが非正定値であるー
ー非線形の場合は、構造物が座屈したり、塑性限界荷重に達している可能性があるー
解決策
