The Experts below are selected from a list of 66 Experts worldwide ranked by ideXlab platform
Dominique Doroszewski - One of the best experts on this subject based on the ideXlab platform.
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a multi scale approach for the simultaneous shape and Material Optimisation of sandwich panels with cellular core
Composites Part B-engineering, 2016Co-Authors: Marco Montemurro, Anita Catapano, Dominique DoroszewskiAbstract:Abstract This work deals with the problem of the optimum design of a sandwich panel made of carbon-epoxy skins and a metallic cellular core. The proposed design strategy is a multi-scale numerical Optimisation procedure that does not make use of any simplifying hypothesis to obtain a true global optimum configuration of the system. To face the design of the sandwich structure at both meso and macro scales, a two-level Optimisation strategy is employed: at the first level the goal is the determination of the optimum shape of the unit cell of the core (meso-scale) together with the Material and geometric parameters of the laminated skins (macro-scale), while at the second level the objective is the design of the skins stacking sequence (skin meso-scale) meeting the geometrical and Material parameters provided by the first-level problem. The two-level strategy is founded on the polar formalism for the description of the anisotropic behaviour of the laminates, on the NURBS basis functions for representing the shape of the unit cell and on the use of a genetic algorithm as Optimisation tool to perform the solution search. To prove its effectiveness, the multi-scale strategy is applied to the least-weight design of a sandwich plate subject to constraints of different nature: on the positive-definiteness of the stiffness tensor of the core, on the admissible Material properties of the laminated faces, on the local buckling load of the unit cell, on the global buckling load of the panel and geometrical as well as manufacturability constraints related to the fabrication process of the cellular core.
Marco Montemurro - One of the best experts on this subject based on the ideXlab platform.
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a multi scale approach for the simultaneous shape and Material Optimisation of sandwich panels with cellular core
Composites Part B-engineering, 2016Co-Authors: Marco Montemurro, Anita Catapano, Dominique DoroszewskiAbstract:Abstract This work deals with the problem of the optimum design of a sandwich panel made of carbon-epoxy skins and a metallic cellular core. The proposed design strategy is a multi-scale numerical Optimisation procedure that does not make use of any simplifying hypothesis to obtain a true global optimum configuration of the system. To face the design of the sandwich structure at both meso and macro scales, a two-level Optimisation strategy is employed: at the first level the goal is the determination of the optimum shape of the unit cell of the core (meso-scale) together with the Material and geometric parameters of the laminated skins (macro-scale), while at the second level the objective is the design of the skins stacking sequence (skin meso-scale) meeting the geometrical and Material parameters provided by the first-level problem. The two-level strategy is founded on the polar formalism for the description of the anisotropic behaviour of the laminates, on the NURBS basis functions for representing the shape of the unit cell and on the use of a genetic algorithm as Optimisation tool to perform the solution search. To prove its effectiveness, the multi-scale strategy is applied to the least-weight design of a sandwich plate subject to constraints of different nature: on the positive-definiteness of the stiffness tensor of the core, on the admissible Material properties of the laminated faces, on the local buckling load of the unit cell, on the global buckling load of the panel and geometrical as well as manufacturability constraints related to the fabrication process of the cellular core.
Simon P Ringer - One of the best experts on this subject based on the ideXlab platform.
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a nexus between 3d atomistic data hybrids derived from atom probe microscopy and computational Materials science a new analysis of solute clustering in al alloys
Scripta Materialia, 2017Co-Authors: Baptiste Gault, X Y Cui, Michael P Moody, Anna V Ceguerra, Andrew J Breen, Ross K W Marceau, Simon P RingerAbstract:Abstract Solute clusters affect the physical properties of alloys. Knowledge of the atomic structure of solute clusters is a prerequisite for Material Optimisation. In this study, solute clusters in a rapid-hardening Al-Cu-Mg alloy were characterised by a combination of atom probe tomography and density functional theory, making use of a hybrid data type that combines lattice rectification and data completion to directly input experimental data into atomistic simulations. The clusters input to the atomistic simulations are thus observed experimentally, reducing the number of possible configurations. Our results show that spheroidal, compact clusters are more energetically favourable and more abundant.
Underwood J - One of the best experts on this subject based on the ideXlab platform.
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The design of 3D shape knitted preforms
RMIT University, 2009Co-Authors: Underwood JAbstract:This research project explores knitting three-dimensional (3D) preforms suitable for fibre-reinforced composite structures utilising Shima Seiki’s industrial knitting technology. The research positions weft knitting as a 3D additive fabrication process that has potential applications in a wider design context away from the textile, clothing and footwear (TCF) industry. The knitting machine could expand its usefulness from being purely a manufacturing process, to become a design tool for creating innovative 3D forms. Within this context, 3D shape knitting offers enormous potential to achieve efficiencies of systems, waste minimisation and Material Optimisation. Technological advances in flat-bed seamless knitting, such as Shima Seiki’s WholeGarment® allow for the automated production of 3D forms that once could only be handmade. These advances provide a unique opportunity for new applications not traditionally associated with knitted textiles. The research undertaken is set out in three parts. Part one focuses on the background knowledge required in order to understand the significance of the research. Part two, the Shape Lexicon, is a visual record of 3D shape knitted preforms, organised into three broad groups and described in detail. To communicate the 3D shape knitted forms, a new methodology focusing on the essential design parameters within a framework of technical constraints was developed via design specifications. Part three shifts to design issues evolving out of the technical explorations of the Shape Lexicon. A small case study CraFormaTion of knitted artefacts demonstrates how the research could be a useful tool for designers to develop new ways of thinking about form and the potential of 3D shape knitting to contribute to a wider design discourse. The Shape Lexicon establishes a link between 3D shape knitting and parametric design principles. By focusing on the relationship of a shape’s variables and not specific values, a more flexible and systems orientated approach to form building was developed. Understanding the basis of parametric design within a knitting context also points to the next generation of digital knit software technology. To date, there has been no concentrated survey of 3D shape knitting techniques or generic knitted 3D forms in one informative document. Therefore this research project fills a significant gap in academic literature. 3D shape knitting informs current design debates including; considerations of design Optimisation in nature, new technology and Materials for design, the reconsideration of craft in a digital context, and the interplay between design and science. Innovations occurring with textile technology and Material science are expanding the creative possibilities for designers to reconsider the relationship between surface and form in a more integrated manner. The Shape Lexicon potentially instigates these exchanges and enacts new ways of thinking about form. Trans-disciplinary approaches are necessary to creatively respond to the nexus of technology and craft, and to be able to blend scientific and technical know-how, with a poetic and aesthetic sensibility. In this context, the potential for Textile Design and Architecture to work more closely together is considered. For textile designers such exchanges assist the discipline to reposition itself beyond the surface
Andrew J Breen - One of the best experts on this subject based on the ideXlab platform.
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a nexus between 3d atomistic data hybrids derived from atom probe microscopy and computational Materials science a new analysis of solute clustering in al alloys
Scripta Materialia, 2017Co-Authors: Baptiste Gault, X Y Cui, Michael P Moody, Anna V Ceguerra, Andrew J Breen, Ross K W Marceau, Simon P RingerAbstract:Abstract Solute clusters affect the physical properties of alloys. Knowledge of the atomic structure of solute clusters is a prerequisite for Material Optimisation. In this study, solute clusters in a rapid-hardening Al-Cu-Mg alloy were characterised by a combination of atom probe tomography and density functional theory, making use of a hybrid data type that combines lattice rectification and data completion to directly input experimental data into atomistic simulations. The clusters input to the atomistic simulations are thus observed experimentally, reducing the number of possible configurations. Our results show that spheroidal, compact clusters are more energetically favourable and more abundant.