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Journal ArticleDOI

Elastic deformation of fiber-reinforced multi-layered composite conical shell of variable stiffness

15 Oct 2016-Composite Structures (Elsevier)-Vol. 154, pp 634-645
TL;DR: In this article, a mathematical model that predicts strain and stress distributions on the conical shell is developed, and numerical examples are given for various fiber paths defined on the truncated conical shells that is subjected to inflating pressure and surface shear traction force on the inner and outer surfaces, respectively.
About: This article is published in Composite Structures.The article was published on 2016-10-15. It has received 9 citations till now. The article focuses on the topics: Finite element method.
Citations
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Journal ArticleDOI
TL;DR: An integrated framework of exact modeling, isogeometric analysis and optimization for variable-stiffness panels is developed for the global optimum, and the proposed method is able to provide a more efficient optimum design with significant less computational cost compared to other traditional methods.

95 citations

Journal ArticleDOI
TL;DR: In this article, the critical buckling loads of laminated truncated conical shells with a given material system are maximized with respect to fiber orientations by using the golden section method.
Abstract: Buckling analyses of laminated truncated conical shells subjected to external hydrostatic compression are carried out by employing the Abaqus finite element program. The critical buckling loads of these truncated conical shells with a given material system are maximized with respect to fiber orientations by using the golden section method. Through parametric studies, the influences of the end condition, shell thickness, shell length, shell radius ratio and cutout size on the optimal buckling loads, the associated optimal fiber orientations and the associated buckling modes are demonstrated and discussed.

20 citations

Journal ArticleDOI
TL;DR: In this article, an adaptive Kriging meta-model is proposed to approximate the structural response of the cylinders and a mixed updating rule is used in constructing the meta model, and a genetic algorithm (GA) is implemented in the optimization design.
Abstract: The large design freedom of variable-stiffness (VS) composite material presupposes its potential for wide engineering application. Previous research indicates that the design of VS cylindrical structures helps to increase the buckling load as compared to quasi-isotropic (QI) cylindrical structures. This paper focuses on the anti-buckling performance of VS cylindrical structures under combined loads and the efficient optimization design method. Two kinds of conditions, bending moment and internal pressure, and bending moment and torque are considered. Influences of the geometrical defects, ovality, on the cylinder’s performances are also investigated. To increase the computational efficiency, an adaptive Kriging meta-model is proposed to approximate the structural response of the cylinders. In this improved Kriging model, a mixed updating rule is used in constructing the meta-model. A genetic algorithm (GA) is implemented in the optimization design. The optimal results show that the buckling load of VS cylinders in all cases is greatly increased as compared with a QI cylinder.

14 citations

Journal ArticleDOI
TL;DR: In this article, a semi-analytical methodology was developed to conduct hygro-thermo-mechanical analysis on thin to relatively-thick fiber-steered composite panels.

14 citations

Journal ArticleDOI
TL;DR: In this article, the free vibration of layered truncated conical shells filled with quiescent fluid using spline method is studied and a generalized eigenvalue problem is obtained and solved numerically for frequency parameter and an associated eigenvector of spline coefficients.

8 citations

References
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Journal ArticleDOI
Michael W. Hyer1, H.H. Lee1
TL;DR: In this article, the authors explored the gains in buckling performance that can be achieved by deviating from the conventional straightline fiber format and considering the situation whereby the fiber orientation in a layer, or a group of layers, can vary from point to point.

349 citations

M. W. Hyer1, H. H. Lee
01 Mar 1990
TL;DR: In this paper, the authors explored the gains in buckling performance that can be achieved by deviating from the conventional straightline fiber format and considering the situation whereby the fiber orientation in a layer, or a group of layers, can vary from point to point.
Abstract: The gains in buckling performance are explored that can be achieved by deviating from the conventional straightline fiber format and considering the situation whereby the fiber orientation in a layer, or a group of layers, can vary from point to point. The particular situation studied is a simply supported square plate with a centrally located hole loaded in compression. By using both a sensitivity analysis and a gradient-search technique, fiber orientation in a number of regions of the plate are selected so as to increase the buckling load relative to baseline straightline designs. The sensitivity analysis is used to determine which regions of the plate have the most influence on buckling load, and the gradient search is used to find the design that is believed to represent the absolute maximum buckling load for the conditions prescribed. Convergence studies and sensitivity of the final design are discussed. By examining the stress resultant contours, it is shown how the curvilinear fibers move the load away from the unsupported hole region of the plate to the supported edges, thus increasing the buckling capacity. The tensile capacity of the improved buckling design is investigated, and it is shown that both tensile capacity and buckling capacity can be improved with the curvilinear fiber concept.

312 citations

Journal ArticleDOI
TL;DR: In this article, a structural approximation scheme is introduced which is referred to as the generalised reciprocal approximation, and optimality conditions for the problem are formulated based on this generalized reciprocal approximation.

244 citations

Journal ArticleDOI
TL;DR: In this article, the authors derived the effective stiffness properties for two types of randomly oriented fiber systems: (1) a system with completely three-dimensional random orientation of fibres in an isotropic matrix phase, appropriate to thin sections in a state of plane stress; and (2) a two-dimensional (planar) random orientations of fiber segments in a planar matrix phase.
Abstract: This paper is concerned with the theoretical derivation of the effective stiffness properties for two types of randomly oriented fibre systems:(a) A system with completely three-dimensional random orientation of fibres in an isotropic matrix phase;(b) A system with two-dimensional (planar) random orientation of fibres in an isotropic matrix phase, appropriate to thin sections in a state of plane stress.The formulas derived predict the effective isotropic properties of the composite in terms of the elastic properties of each phase and the volume concentration of the fibre phase. These results provide the theoretical limits with which experimental results can be compared to assess the effectiveness of bonds, dispersion of fibres and any other factors which may affect the performance. In the last section a comparison is made with experimental results. In addition, the relation of the present study to pre vious work on this topic is discussed.

203 citations

Journal ArticleDOI
TL;DR: In this paper, the effects of fiber waviness on the elastic properties of composite materials theoretically and experimentally were investigated and the results were in good agreement with predictions based on the constitutive model.
Abstract: An investigation was conducted of the effects of fiber waviness on the elastic properties of composite materials theoretically and experimentally. Unidirectional and crossply carbon/epoxy composites with uniform, graded and localized fiber waviness were studied. An analytical constitutive model was developed to determine the elastic properties as a function of fiber waviness. Compression tests were conducted to verify the constitutive relations. Experimental results were in good agreement with predictions based on the constitutive model.

186 citations