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- 저자 : Sadah A. Al Khateeb (검색결과 1 건)
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Evaluation of refined theories for multilayered shells via Axiomatic/Asymptotic method
Daoud S. Mashat,E. Carrera,Ashraf M. Zenkour,Sadah A. Al Khateeb,A. Lamberti 대한기계학회 2014 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.28 No.11
This paper is devoted to refined shell theories for the analysis of isotropic and laminated shells. Refined theories are built by assuminghigher expansion order for the displacement field in the shell thickness directions. The implementation of these theories is made accordingto the Carrera unified formulation (CUF) which makes it possible to obtain shell governing equations in terms of fundamental nucleiwhose form is independent of the chosen theory shell. Equivalent single layer and layer wise schemes are used. The axiomatic/asymptotic technique is employed to evaluate the effectiveness of each displacement variable in the adopted displacement expansion. The error introduced by each term deactivation is evaluated with respect to a reference solution and according to a given error criterion; ifthe error computed does not exceed an a priori defined threshold the term is considered as not relevant and discarded. In this way it ispossible to construct reduced models for each stress/displacement component. Attention has been restricted to closed form Navier typesolutions and simply supported orthotropic shells are considered in the numerical investigation. Analysis of the displacement variablesrelevance is performed considering the influence of the kind of material and of the geometry, specifically isotropic and laminated materialsand thick and thin shells. “Best”' reduced models are proposed and related distributions are discussed.
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