Closed-form solution for elastic-plastic analysis of selected fiber metal laminates during loading-unloading cycle
Tomasz Nowak
Quarterly No. 2, 2017 pages 97-102
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abstract Fiber reinforced polymer composites and aluminum alloys nowadays constitute the most dominant materials applied in the aerospace industry. This paper gives the theoretical background and provides both analytical and numerical calculations for analysis of the elastic-plastic behavior of a selected fiber metal laminate. The work introduces the closed-form solution for a multi-layered structure subjected to a unidirectional loading/unloading cycle, and explains the process of stress and strains development. GLARE® plates, which are exposed to a tensile load, can generate even higher stress in the aluminum layers at unloading. Moreover, delamination and buckling of the external layers can be expected. The paper gives a detailed theoretical framework for this behavior based on the plasticity theory, provides numerical calculations, and compares them with the FEM and experimental results. Keywords: elastic-plastic behavior, thin-walled plates, composite-reinforced metal structures, theory of orthotropic materials, GLARE®