The purpose of the study was to improve the understanding of the nonlinear behaviour of beams and plates excited to high levels of vibration and to develop multimodal fatigue models for aircraft structures. The implications of nonlinear behaviour of beam and plates relative to fatigue life are investigated. Two types of materials are studied, an aluminium alloy and a carbon fibre reinforced plastic. Single mode cumulative damage models are studied. The Miles single mode model is modified to account for the multimodal strain response of clamped straight beams and flat plates. Trends in the strain peak probability densities at low level and high levels of excitation are analyzed to determine the effects of axial strain on their shape. An effective multimodal cyclic frequency model is developed. The effects on the fatigue life estimates are presented. A method to incorporate the effects of multimodal response of simple structures is presented. The fatigue model developed gives reasonable estimates of the multimodal fatigue life.
Fatigue aspects of nonlinear beam and plate response to random excitation
Ermüdungsaspekte des nichtlinearen Verhaltens von Balken und Platten gegenüber einer zufälligen Erregung
1995
11 Seiten, 15 Bilder, 2 Tabellen, 6 Quellen
Conference paper
English
Fatigue Aspects of Nonlinear Beam and Plate Response to Random Excitation
British Library Conference Proceedings | 1995
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