Journal ArticleDOI
Optimal fiber paths for robotically manufactured composite structural panels
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TLDR
A novel method to model fiber paths is introduced where each course of the lay-up can be explicitly modeled, including manufacturing artifacts of course width, admissible tow curvature, and control on unintended manufacturing deviations that can lead to gaps and overlaps.Abstract:
Robotic Automated Fiber Placement (RAFP) has revolutionized manufacturing of large aerostructures in recent years. From producing lower costing parts to reducing scrap, RAFP has also helped in manufacturing large parts with contours precisely, with repeatable production once the RAFP machine is programmed. RAFP manufacturing allows a designer to utilize curvilinear fiber paths specifically designed to optimize structural performance, for example, maximizing buckling loads, minimizing stress concentrations etc. At the same time, RAFP introduces unintended manufacturing imperfections. These, which can include overlaps and gaps, lead to thickness non-homogeneities in structural panels. In this paper, steered fiber paths for maximizing the buckling loads of RAFP panels while explicitly accounting for manufacturing imperfections is considered. A novel method to model fiber paths is introduced where each course of the lay-up can be explicitly modeled, including manufacturing artifacts of course width, admissible tow curvature, and control on unintended manufacturing deviations that can lead to gaps and overlaps. A machine learning based surrogate modeling technique in conjunction with Genetic Algorithm is used to derive the optimal solutions.read more
Citations
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A competitive variable-fidelity surrogate-assisted CMA-ES algorithm using data mining techniques
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An isogeometric framework for the modeling of curvilinear anisotropic media
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Use of a neural network constitutive model for the size-dependent effects of curing on the deformation response and failure of fiber-reinforced polymer matrix composites
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Minimizing stress concentrations using steered fiberpaths and incorporating realistic manufacturing signatures
TL;DR: In this article , the authors present an example problem to minimize the stress concentration factor (SCF) around a window cutout typical of a composite aircraft fuselage using a RAFP machine.
References
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Book
Mechanics of Laminated Composite Plates and Shells : Theory and Analysis, Second Edition
TL;DR: The use of composite materials in engineering structures continues to increase dramatically, and there have been significant advances in modeling for general and composite materials and structures in particular as discussed by the authors. But the use of composites is not limited to the aerospace domain.
Book
Mechanics of laminated composite plates and shells : theory and analysis
TL;DR: In this article, the authors present an analysis of the properties of composite materials using the classical and first-order theories of Laminated Composite Plates and shells, as well as a detailed analysis of their properties.
Journal ArticleDOI
Review of Metamodeling Techniques in Support of Engineering Design Optimization
Gongming Wang,Songqing Shan +1 more
TL;DR: This work reviews the state-of-the-art metamodel-based techniques from a practitioner's perspective according to the role of meetamodeling in supporting design optimization, including model approximation, design space exploration, problem formulation, and solving various types of optimization problems.
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.