Journal ArticleDOI
Variable stiffness composite panels : Effects of stiffness variation on the in-plane and buckling response
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In this paper, the fiber orientation variation for flat rectangular composite laminates that possess variable stiffness properties is described, which employs a unidirectional variation based on a linear function for fiber orientation angle of individual layers.Abstract:
Descriptions of fiber orientation variation for flat rectangular composite laminates that possess variable stiffness properties are introduced. The simplest definition employs a unidirectional variation based on a linear function for the fiber orientation angle of the individual layers. Analyses of variable stiffness panels for in-plane and buckling responses are developed and demonstrated for two distinct cases of stiffness variations. The first case assumes a stiffness variation in the direction of the loading, and numerical results indicate small improvements in buckling load for some panel configurations due to favorable distribution of the transverse stresses over the panel planform. The second case varies the stiffness perpendicular to the loading, and provides a much higher degree of improvement due to the re-distribution of the applied loads. It is also demonstrated that the variable stiffness concept provides a flexibility to the designer for trade-offs between overall panel stiffness and buckling load, in that there exist many configurations with equal buckling loads yet different global stiffness values, or vice versa.read more
Citations
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Journal ArticleDOI
Optimum stacking sequence design of composite materials Part II: Variable stiffness design
TL;DR: In this paper, a composite laminate may be designed as a permutation of several straight-fiber layers or as a matrix embracing fibers positioned in curvilinear paths.
Journal ArticleDOI
Experimental study of the effect of automated fiber placement induced defects on performance of composite laminates
TL;DR: In this article, the effect of four principal defect types, namely gap, overlap, half gap/overlap and twisted tow on the ultimate strength of a composite structure was investigated at the lamina and laminate level.
Journal ArticleDOI
Variable stiffness material and structural concepts for morphing applications
TL;DR: The need for attention directed to the variable stiffness strategy is recognised and the significance of intensive research activities in a highly integrated and multidisciplinary environment emphasised if higher maturity stages of the concepts are to be reached.
Journal ArticleDOI
Buckling analysis and optimisation of variable angle tow composite plates
TL;DR: In this article, a new mathematical definition is proposed to represent the general variation of fibre-orientation in the VAT plate, the coefficients of polynomials are directly equal to the designed fibre angles at pre-selected control points.
Journal ArticleDOI
Structural composites for multifunctional applications: current challenges and future trends
Carlos González,Carlos González,Juan J. Vilatela,Jon M. Molina-Aldareguia,Claudio S. Lopes,Javier LLorca,Javier LLorca +6 more
TL;DR: In this paper, the authors summarized the current state-of-the-art and challenges for the future developments of fiber-reinforced composites for structural applications with multifunctional capabilities.
References
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Book
Design and optimization of laminated composite materials
TL;DR: In-Plane Stiffness Design. Failure Criteria for Laminated Composites as discussed by the authors, failure criteria for laminate composites, and strength design of laminate materials.
Journal ArticleDOI
In-plane response of laminates with spatially varying fiber orientations - Variable stiffness concept
Zafer Gürdal,Reynaldo Olmedo +1 more
TL;DR: In this paper, a solution to the plane elasticity problem for a symmetrically laminated composite panel with spatially varying fiber orientations has been obtained, and the effects of the variable fiber orientation on the displacement fields, stress resultants and global stiffness are analyzed.
Journal ArticleDOI
The use of curvilinear fiber format to improve buckling resistance of composite plates with central circular holes
Michael W. Hyer,H.H. Lee +1 more
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.
Innovative design of composite structures: The use of curvilinear fiber format to improve buckling resistance of composite plates with central circular holes
M. W. Hyer,H. H. Lee +1 more
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.
Journal ArticleDOI
Use of curvilinear fiber format in composite structure design
Michael W. Hyer,R. F. Charette +1 more
TL;DR: In this paper, the authors investigated the gains in structural efficiency that can be achieved by aligning the fibers in some or all of the layers in a laminate with the principal stress directions in those layers.
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In-plane response of laminates with spatially varying fiber orientations - Variable stiffness concept
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