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12th International Conference on Fracture 2009, ICF-12

作者： Burke-Veliz, A. Reed, P.A.S. Syngellakis, S. Computational Engineering and Design Group University of Southampton Southampton United Kingdom Engineering Materials and Surface Engineering Group University of Southampton Southampton United Kingdom

ISBN: (纸本)9781617382277

The assessment of shielding and anti-shielding effects on crack growth in multi-layered architectures is achieved using elasto-plastic finite element models. Initially, the evolution of straight, deflected and bifurcated cracks is studied through two-dimensional models with blunted crack tips using the maximum tangential strain as a criterion for deflection and the crack opening displacement as the crack driving force. The methodology is extended to three dimensions assuming only elastic material behavior;some initial analysis results on the effects of shielding along the crack front are presented and discussed.

关键词： Shielding

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Supervised learning approach to parametric computer-aided design geometry repair

Supervised learning approach to parametric computer-aided de...

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作者： Sóbester, András Keane, Andy J. University of Southampton Southampton SO17 1BJ United Kingdom Computational Engineering and Design Group AIAA Department of Computational Engineering

Multidisciplinary optimization systems rely increasingly on parametric CAD engines to supply the geometries required by their analysis components. Such parametric geometry models usually result from an uneasy compromise between high flexibility, that is, the ability to morph into a wide variety of topologies and shapes, and robustness, the ability to produce feasible, sensible topologies and shapes throughout most of the design space. It is argued that a possible means of achieving both objectives is via a supervised learning system attached to the CAD model. It is shown that such a model can capture some of the engineering and geometrical judgment of the designer and can thereafter be used to repair design variable sets that lead to infeasible CAD models. Copyright © 2005 by the American Institute of Aeronautics and Astronautics, Inc. All rights reserved.

关键词： Computer aided design

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A numerical study of the effect of ply-layup on the strength and stiffness of a composite T-joint under three point bending (vol 31, pg 2124, 2017)

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JOURNAL OF ADHESION SCIENCE AND TECHNOLOGY 2017年第19-20期31卷 I-I页

作者： Azam, Ammar Mubashar, Aamir Ashcroft, Ian Anthony Uddin, Emad Jaffery, Syed Husain Imran Computational Mechanics Group Department of Mechanical Engineering School of Mechanical and Manufacturing Engineering National University of Sciences and Technology (NUST) Islamabad Pakistanhttp://***/0000-0002-2299-1939 Computational Mechanics Group Department of Mechanical Engineering School of Mechanical and Manufacturing Engineering National University of Sciences and Technology (NUST) Islamabad Pakistan Faculty of Engineering University of Nottingham Nottingham UK Computational Mechanics Group Department of Mechanical Engineering School of Mechanical and Manufacturing Engineering National University of Sciences and Technology (NUST) Islamabad Pakistan Department of Manufacturing and Design Engineering School of Mechanical and Manufacturing Engineering National University of Sciences and Technology (NUST) Islamabad Pakistan

This paper discusses the effects of various ply-layup orientations on the bending stiffness of a composite T-joint by determining the in-plane and out-of-plane stress fields developed under three-point bending conditions. The failure load and crack development in the T-joints with selected ply-layups are also considered. A three dimensional finite element model of the composite T-joint was developed and validated by comparison with experimental results. Five selected ply-layups were applied to the validated composite T-joint model and in-plane as well as out-of-plane stress fields investigated. It was found that bending stiffness was primarily influenced by plies that came under tension during the application of the force. Symmetric layups with ply angles that cancel the tensile stiffening effects reduce the bending stiffness. No appreciable out of plane coupling effects were observed and thus the overall magnitudes of the out of plane shear forces were not significant when compared with in-plane stresses. Damage initiated at the sites of stress concentration at the ends of the adhesive layer and cracks propagated towards the middle of the T-joint.

关键词： Composite T-joint adhesive cohesive zone modelling

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computational thermodynamics, computational kinetics, and materials design

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Chinese Science Bulletin 2014年第15期59卷 1662-1671页

作者： Xiao-Gang Lu Zhuo Wang Yuwen Cui Zhanpeng Jin School of Materials Science and Engineering Shanghai University Central Iron and Steel Research Institute Computational Alloy Design Group IMDEA Materials Institute School of Materials Science and Engineering Central South University

computational thermodynamics,known as CALPHAD method when dawned in 1950s,aimed at coupling phase diagrams with thermochemistry by computational *** eventually evolves toward kinetic simulations integrated with thermodynamic calculations,i.e.,computational kinetics,including diffusion-controlled phase transformation,precipitation simulation,and phasefield *** the meantime,thermodynamic,mobility,and physical property databases for multi-component and multi-phase materials,served as basic knowledge for materials design,are critically evaluated by CALPHAD approach combining key experiments,first-principles calculations,statistic methods,and empirical *** combination of these computational techniques with their conjugated databases makes it possible to simulate phase transformations and predict the microstructure evolution in real materials in a foreseeable *** links to microand macro-scale simulations lead to a multi-scale computational framework,and aid the search for the quantitativerelations among chemistry,process,microstructures,and materials properties in order to accelerate materials development and *** is a new route of materials and process design pursued by Integrated computational Materials engineering(ICME)and Materials Genome Initiative(MGI).This article presents a review on the basic theories and applications,the state of the art and perspective of computational thermodynamics and kinetics.

关键词：动力学计算热力学计算材料设计动力学模拟相图计算计算技术微观结构工艺设计

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Evolving intervening variables for response surface approximations

Evolving intervening variables for response surface approxim...

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Collection of Technical Papers - 10th AIAA/ISSMO Multidisciplinary Analysis and Optimization Conference

作者： Soábester, Andraás Nair, Prasanth B. Keane, Andy J. University of Southampton Southampton Hampshire SO17 1BJ United Kingdom Computational Engineering and Design Group United Kingdom Department of Computational Engineering

ISBN: (纸本)1563477165

Genetic Programming (GP) is a powerful string processing technique based on the Darwinian paradigm of natural selection. Although initially conceived with the more general aim of automatically producing computer code for complex tasks, it can also be used to evolve symbolic expressions, provided that we have a fitness criterion that measures the quality of an expression. In this paper we present a GP approach for generating functions in closed analytic form that map the input space of a complex function approximation problem into one where the output is more amenable to linear regression. In other words, intervening variables are evolved in each dimension, such that the final approximation model has good generalization properties and at the same time, due to its linearity, can easily be incorporated into further calculations. We employ least squares and cross-validation error measures to derive the fitness function that drives the evolutionary process. Results are presented for a one-dimensional test problem to illustrate some of the proposed ideas -this is followed by a more thorough empirical study, including multi-dimensional approximations and an engineering design problem.

关键词： Approximation theory

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Knowledge based system for cost optimization

Knowledge based system for cost optimization

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48th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference

作者： Tammineni, S.V. Scanlan, J.P. Reed, P.A.S. CEDC University of Southampton Hampshire SO17 1BJ United Kingdom School of Engineering Science University of Southampton Hampshire SO17 1BJ United Kingdom Computational Engineering Design Research Group School of Engineering Sciences Department of Design Computational Engineering and Design Research Group School of Engineering Sciences School of Engineering Sciences

ISBN: (纸本)1563478927

The research work in this paper presents cost-optimisation as being integrated in the design process. It focuses on the need for intimate interaction between design and cost estimation, where the cost estimation process is owned & carried out by the designer. A knowledge-based system will be employed for providing cost information to the designer for the purpose of cost optimization at the concept phase of design. A hybrid cost estimating method is used in the knowledge-based system to evaluate the unit cost of product. The knowledge-based system (i.e. costing tool) employs a hybrid knowledge representation scheme to represent cost information. A case study demonstrating the research applied to a Rolls Royce aircraft gas turbine engine component is presented. Rolls Royce has directly funded this research and the research team is grateful for being given permission to publish these results.

关键词： Knowledge based systems

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Lithium mobility in lithium-montmorillonite/poly(ethylene oxide) electrolytes: A molecular dynamics simulation study

Lithium mobility in lithium-montmorillonite/poly(ethylene ox...

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2013 3rd International Conference on Advanced Materials and engineering Materials 2013, CAMEM 2013

作者： Afifah, Hasna Tanuwijaya, Viny V. Nugraha Dipojono, Hermawan K. Laboratory of Computational Material Design and Quantum Engineering Engineering Physics Research Group Jl. Ganesha 10 Bandung 40132 Indonesia

ISBN: (纸本)9783038350255

Classical molecular dynamic simulation was performed on electrolyte system of lithiummontmorillonite/ poly(ethylene oxide) to investigate mobility behavior of lithium once it had been absorbed into montmorillonite's octahedral site. Temperature of 100, 200, and 300 K were chosen for measurement using canonical ensemble. Phase space information were proceeded to do analysis on diffusion coefficients of lithium atoms and radial distribution function graphs of lithium pair. Results showed a solid-like behavior of lithium indicating its high stability inside montmorillonite's octahedral site. Very little movement was observed with slight increase over temperature rise. © (2014) Trans Tech Publications, Switzerland.

关键词： Molecular dynamics

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A knowledge-based geometry repair system for robust parametric CAD models

A knowledge-based geometry repair system for robust parametr...

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作者： Li, Dong Sóbester, András Keane, Andy J. Computational Engineering and Design Group School of Engineering Sciences University of Southampton Southampton Hampshire SO171BJ United Kingdom

ISBN: (纸本)9781600867392

In modern multi-objective design optimization (MDO) an effective geometry engine is becoming an essential tool and its performance has a significant impact on the entire MDO process. Building a parametric geometry requires difficult compromises between the conflicting goals of robustness and flexibility. This article presents a method of improving the robustness of parametric geometry models by capturing and modeling engineering knowledge with a support vector regression surrogate, and deploying it automatically for the search of a more robust design alternative while trying to maintain the original design intent. design engineers are given the opportunity to choose from a range of optimized designs that balance the 'health' of the repaired geometry and the original design intent. The prototype system is tested on a 2D intake design repair example and shows the potential to reduce the reliance on human design experts in the conceptual design phase and improve the stability of the optimization cycle. It also helps speed up the design process by reducing the time and computational power that could be wasted on flawed geometries or frequent human interventions.

关键词： Geometry

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Rapid development of bespoke sensorcraft: A proposed design loop 56

Rapid development of bespoke sensorcraft: A proposed design ...

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56th AIAA/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference 2015

作者： Paulson, Christopher Sóbester, András Scanlan, Jim University of Southampton Computational Engineering and Design Group SouthamptonSO17 1BJ United Kingdom

ISBN: (数字)9781624103421

ISBN: (纸本)9781624103421

The ability to quickly fabricate sensorcraft, or other small unmanned aircraft, via additive manufacturing techniques opens a range of new possibilities for the design and optimization of these vehicles. In this paper we propose a design loop that makes use of surrogate modeling and additive manufacturing to reduce the design and optimization time of scientific sensorcraft. Additive manufacturing reduces the time and effort required to fabricate a complete aircraft, allowing design iterations to be quickly manufactured and fiight tested. Co-Kriging surrogate models allow data collected from testfi ights to correct Kriging models trained with numerically simulated data. The resulting model provides physically accurate and computationally cheap aircraft performance predictions. A global optimizer is used to search this model to find an optimal design for a bespoke aircraft. This paper presents the design loop and the progress made in implementing this design loop. Results are shown from Kriging models trained using numerically simulated data. Progress towards extracting aerodynamic data from fight testing small unmanned aircraft is also documented. © 2015, American Institute of Aeronautics and Astronautics Inc. All Rights Reserved.

关键词： 3D printers

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Meshless domain decomposition schemes for nonlinear elliptic PDEs

Meshless domain decomposition schemes for nonlinear elliptic...

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3rd M.I.T. Conference on computational Fluid and Solid Mechanics

作者： Chinchapatnam, Phani P. Djidjeli, K. Nair, Prasanth B. Computational Engineering and Design Group University of Southampton Southampton SO17 1BJ United Kingdom

ISBN: (纸本)0080444814

In this paper, we present a radial basis function based meshless method that employs Schwarz domain decomposition techniques and Newton iteration for solving nonlinear elliptic partial differential equations (PDEs). Numerical results are presented for a model nonlinear Poisson problem. We find that the domain decomposition algorithms give accurate results at a much lower cost. In addition, these algorithms are straightforward to parallelize. © 2005 Elsevier Ltd.

关键词： Iterative methods

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