An eigenanalysis-based bifurcation indicator proposed in the framework of a reduced-order modeling technique for non-linear structural analysis

作者：Liang Ke; Ruess Martin; Abdalla Mostafa

来源：International Journal of Non-Linear Mechanics, 2016, 81: 129-138.

DOI：10.1016/j.ijnonlinmec.2016.01.013

• Koiter-Newton method
• Bifurcation indicator
• Eigenanalysis
• Tangent stiffness
• Reduced order model

The Koiter-Newton method is a reduced order modeling technique which allows us to trace efficiently the entire equilibrium path of a non-linear structural analysis. In the framework of buckling the method is capable to handle snap-back and snap-through phenomena but may fail to predict reliably bifurcation branches along the equilibrium path. In this contribution we extend the original Koiter-Newton approach with a reliable and accurate bifurcation indicator which is based on an eigenanalysis of the reduced order tangent stiffness matrix. The proposed indicator has a negligible numerical effort since all computations refer to the reduced order model which is typically of very small dimension. The extension allows the identification of bifurcation points and a tracing of corresponding bifurcation branches in each sector of the equilibrium path. The performance of the method in terms of reliability, accuracy and computational effort is demonstrated with several examples.

• 出版日期2016-5
• 单位中国空间技术研究院