The construction of modern vehicles in aerospace and terrestrial applications is strongly influenced by the increasing use of fibre composites. These materials are different from the formerly used metals because they are made of several components. They are anisotropic and inhomogenous and they have very good specific stiffness and strength properties. On the other hand their layered structure also leads to new kinds of damages (e.g. delaminations) with new damage effects which are unknown from metals. The recently used Structural Dynamic Damage Diagnosis presented in this paper is based on the assumption that a damage (e.g. material fatigue or a delamination in composites) will lead to a local stiffness reduction in at least one degree of freedom resulting in changes of the dynamic behavior. For the diagnosis a finite element model of a structure is needed to simulate changes of the modal parameters due to the damages of the structure. These changes are directly related to the location and extent of the damage. An interpolation approach is applied to localize and quantify the damage by performing the inverse eigenvalue problem.
Structureal dynamic health monitoring for adaptive composite structures
Strukturdynamische Funktionssicherheitsüberwachung für adaptive Verbundkonstruktionen
1998
12 Seiten, 8 Bilder, 9 Quellen
Aufsatz (Konferenz)
Englisch
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