Modal Investigations of Pultruded Hybrid Composite Frame Structures Using Experimental and Finite Element Methods
نویسندگان
چکیده
The modal behavior of stmctures is governed by the mechanical characteristics of the constituent components. The dynamic mechanical properties of composite smvztures can be modified according to design requirements through hybridization. The objective of this research is to utilize hybridized pultmded composite materials for the dynamic modification and/or optimization of frames and space stNchues. Candidate materials used in this investigation include pultmded glass/epoxy, graphite/epoxy and various lay-up combinations of hybrid glassgraphite/epoxy composite beams. Experimental modal analysis (EMA) and fmite element analysis (FE) were employed for the identification and validation of modal properties of the primary and modified tiame structures. SMS STAR structural analysis sofhvare package and the super computer based PATRAN/P3 and ABAQUS finite element programs were used for modal identification. The structures were dynamically modified for design flexibility by coupling various combinations of glass/epoxy and graphite/epoxy flat beams. Both the EMA data and FEA predictions were found to be in good agreement. The results of this research indicate the advantages of Fiber reinforced Composites (FRC) in stmctural modifications, demonstrating their applicability and dynamic superiority.
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