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Nichtlineare Stabilitätsuntersuchungen mit der Methode der Finiten Elemente

Nonlinear stability analysis in finite element formulation

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Übersicht

Ziel der Arbeit ist die exakte und genäherte Bestimmung der kritischen Last von elastischen Systemen mit nichtlinearem Vorbeulverhalten. Grundlage ist die Verschiebungsformulierung der Methode der finiten Elemente in inkrementell/iterativer Darstellung. Im ersten Hauptteil werden begleitende Stabilitätsuntersuchungen bei der exakten Auswertung der nichtlinearen Gleichungen behandelt. Hierzu gehören die Determinantenbeobachtung sowie Eigenwertuntersuchungen für den Lastparameter und die Eigenfrequenz. Im zweiten Hauptteil werden zwei verbesserte Anfangsstabilitätsanalysen zur genäherten Bestimmung der kritischen Last vorgestellt, die auf Reihenlösungen der Gleichgewichts- und Stabilitätsgleichungen basieren. In beiden Teilen bestätigen zahlreiche Beispiele die Brauchbarkeit der behandelten Verfahren.

Summary

Exact and approximate solutions for the critical load of elastic structures exhibiting a nonlinear prebuckling response are described. The incremental iterative displacement finite element formulation is used. Two main aspects are covered. First different supplementary procedures evaluating the stability citerion parallel to the nonlinear analysis are investigated. Among these are the function of the determinant, and eigenvalue formulations for the load parameter and the frequency. In the second part two improved initial stability analyses are proposed to determine an approximate solution of the final critical load. They are based on the perturbation method in which the equilibrium and stability equations are expanded in series solutions. In both parts several numerical examples are given.

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Brendel, B., Ramm, E. Nichtlineare Stabilitätsuntersuchungen mit der Methode der Finiten Elemente. Ing. arch 51, 337–362 (1982). https://doi.org/10.1007/BF00536659

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  • DOI: https://doi.org/10.1007/BF00536659

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