NDLI: Probabilistic dynamic buckling of smart composite shells

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Probabilistic dynamic buckling of smart composite shells

Content Provider	NASA Technical Reports Server (NTRS)
Author	Abumeri, Galib H. Chamis, Christos C.
Copyright Year	2003
Description	A computational simulation method is presented to evaluate the deterministic and nondeterministic dynamic buckling of smart composite shells. The combined use of composite mechanics, finite element computer codes, and probabilistic analysis enable the effective assessment of the dynamic buckling load of smart composite shells. A universal plot is generated to estimate the dynamic buckling load of composite shells at various load rates and probabilities. The shell structure is also evaluated with smart fibers embedded in the plies right below the outer plies. The results show that, on the average, the use of smart fibers improved the shell buckling resistance by about 10 percent at different probabilities and delayed the buckling occurrence time. The probabilistic sensitivities results indicate that uncertainties in the fiber volume ratio and ply thickness have major effects on the buckling load while uncertainties in the electric field strength and smart material volume fraction have moderate effects. For the specific shell considered in this evaluation, the use of smart composite material is not recommended because the shell buckling resistance can be improved by simply re-arranging the orientation of the outer plies, as shown in the dynamic buckling analysis results presented in this report.
File Size	556061
Page Count	20
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_20040008892
Archival Resource Key	ark:/13960/t4hn06449
Language	English
Publisher Date	2003-11-01
Access Restriction	Open
Subject Keyword	Structural Mechanics Probability Theory Shells Structural Forms Dynamic Loads Computerized Simulation Smart Materials Computer Programs Finite Element Method Sensitivity Graphite-epoxy Composites Ply Orientation Composite Structures Buckling Electric Field Strength Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Technical Report

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