Non-polynomial Zig-Zag and ESL shear deformation theory to study advanced composites

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英文篇名：Non-polynomial Zig-Zag and ESL shear deformation theory to study advanced composites 作者：J.L.MANTARI ; I.A.RAMOS ; J.C.MONGE 英文作者：J.L.MANTARI;I.A.RAMOS;J.C.MONGE;Faculty of Mechanical Engineering, Instituto de investigación en ingeniería naval (IDIIN), National University of Engineering (UNI);Department of Mechanical Engineering, University of New Mexico;Faculty of Mechanical Engineering, Universidad de Ingeniería y Tecnología (UTEC); 英文关键词：Analytical solution;;Composite materials;;CUF;;ESL;;Plate;;Trigonometric functions;;Zig-Zag effects 中文刊名：HKXS 英文刊名：中国航空学报(英文版) 机构：Faculty of Mechanical Engineering, Instituto de investigación en ingeniería naval (IDIIN), National University of Engineering (UNI),Lima 15333, Peru;Department of Mechanical Engineering, University of New Mexico;Faculty of Mechanical Engineering, Universidad de Ingeniería y Tecnología (UTEC); 出版日期：2019-04-15 出版单位：Chinese Journal of Aeronautics 年：2019 期：v.32;No.157 基金：‘‘Dise?o y optimización de dispositivos de drenaje para pacientes con glaucoma mediante el uso de modelos computacionales de ojos” founded by Cienciactiva, CONCYTEC, under the contract number N° 008-2016-FONDECYT;; financial support from the Peruvian Government 语种：英文; 页：HKXS201904012 页数：15 CN：04 ISSN：11-1732/V 分类号：140-154

摘要

The mechanical behavior of advanced composites can be modeled mathematically through unknown variables and Shear Strain Thickness Functions(SSTFs). Such SSTFs can be of polynomial or non-polynomial nature and some parameters of non-polynomial SSTFs can be optimized to get optimal results. In this paper, these parameters are called ‘‘r" and ‘‘s" and they are the argument of the trigonometric SSTFs introduced within the Carrera Unified Formulation(CUF). The Equivalent Single Layer(ESL) governing equations are obtained by employing the Principle of Virtual Displacement(PVD) and are solved using Navier method solution. Furthermore, trigonometric expansion with Murakami theory was implemented in order to reproduce the Zig-Zag effects which are important for multilayer structures. Several combinations of optimization parameters are evaluated and selected by different criteria of average error. Results of the present unified trigonometrical theory with CUF bases confirm that it is possible to improve the stress and displacement results through the thickness distribution of models with reduced unknown variables. Since the idea is to find a theory with reduced numbers of unknowns, the present method appears to be an appropriate technique to select a simple model. However these optimization parameters depend on the plate geometry and the order of expansion or unknown variables. So, the topic deserves further research.
        The mechanical behavior of advanced composites can be modeled mathematically through unknown variables and Shear Strain Thickness Functions(SSTFs). Such SSTFs can be of polynomial or non-polynomial nature and some parameters of non-polynomial SSTFs can be optimized to get optimal results. In this paper, these parameters are called ‘‘r" and ‘‘s" and they are the argument of the trigonometric SSTFs introduced within the Carrera Unified Formulation(CUF). The Equivalent Single Layer(ESL) governing equations are obtained by employing the Principle of Virtual Displacement(PVD) and are solved using Navier method solution. Furthermore, trigonometric expansion with Murakami theory was implemented in order to reproduce the Zig-Zag effects which are important for multilayer structures. Several combinations of optimization parameters are evaluated and selected by different criteria of average error. Results of the present unified trigonometrical theory with CUF bases confirm that it is possible to improve the stress and displacement results through the thickness distribution of models with reduced unknown variables. Since the idea is to find a theory with reduced numbers of unknowns, the present method appears to be an appropriate technique to select a simple model. However these optimization parameters depend on the plate geometry and the order of expansion or unknown variables. So, the topic deserves further research.

引文

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