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Article
Proton radiography of explosively dispersed metal particles with varying volume fraction and varying carrier phase
A series of experiments were performed to provide validation data for explosively driven multiphase flows at moderate-to-high volume fractions. A ...
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Article
Constrained particle swarm optimization using a bi-objective formulation
This paper introduces an approach for dealing with constraints when using particle swarm optimization. The constrained, single objective optimization problem is converted into an unconstrained, bi-objective op...
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Article
Optimization of fiber orientations near a hole for increased load-carrying capacity of composite laminates
In this paper, a procedure for optimizing the fiber orientations near a hole in a single layer of multilayer composite laminates for increased strength is presented. A symmetric six-layer [(C-0)/+45/-45]s laminat...
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Article
Structural optimization complexity: what has Moore’s law done for us?
Rapid increases in computer processing power, memory and storage space have not eliminated computational cost and time constraints on the use of structural optimization for design. This is due to the constant ...
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Article
Optimization of functionally graded metallic foam insulation under transient heat transfer conditions
The problem of minimizing the maximum temperature of a structure insulated by a functionally graded metal foam insulation under transient heat conduction is studied. First, the performance of insulation design...
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Article
New formulation of minimum-bias central composite experimental design and Gauss quadrature
Response surface methods provide a powerful tool for constructing approximations to complex response functions. Statistical design of experiments is usually used to select optimal points that minimize the erro...
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Article
Global-local structural optimization using response surfaces of local optimization margins
A general decomposition method developed by Haftka and Watson is applied to global-local structural optimization problems. First, a large number of component optimizations for maximization of margins are perfo...
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Article
Reliability-based design optimization using probabilistic sufficiency factor
A probabilistic sufficiency factor approach is proposed that combines safety factor and probability of failure. The probabilistic sufficiency factor approach represents a factor of safety relative to a target ...
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Article
Maximization of buckling loads of composite panels using flexural lamination parameters
Unstiffened composite panels are optimized by using flexural lamination parameters as continuous design variables for the case in which the amounts of 0°, ±45°, and 90° plies are given. It is shown that for t...
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Article
Single-level composite wing optimization based on flexural lamination parameters
An optimization procedure based on flexural lamination parameters is used to integrate unstiffened composite panel design and wing structural design. The lamination parameters are constrained to a hexagonal do...
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Article
Implementation of a crack propagation constraint within a structural optimization software
A crack propagation constraint related to the stress intensity factor is examined for the minimum-weight design optimization of a composite blade-stiffened panel. A low-fidelity approach uses a closed-form sol...
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Article
Uri Kirsch: Design-oriented analysis of structures. Kluwer Academic Publishers, Dordrecht, 2002. p. 236
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Article
Optimization of axisymmetric elastic modulus distributions around a hole for increased strength
Holes in engineering structures cause stress concentrations that often lead to failure. In nature, however, blood vessel holes (foramina) in load-bearing bones are not normally involved in structural failures....
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Article
Structural optimization using biological variables to help understand how bones design holes
Bones do not normally fracture near blood vessel holes. This in part may be related to spatial distribution of porosity, mineralization, and microstructure observed near the holes, as these parameters are know...
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Article
Multi-fidelity design of stiffened composite panel with a crack
Crack propagation is an important concern in the design of aircraft composite fuselage and wing panels. However, numerical simulation of crack propagation is computationally expensive. This work proposes combi...
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Article
Two-level composite wing structural optimization using response surfaces
A two-level optimization procedure for composite wing design subject to strength and buckling constraints is presented. At wing-level design, continuous optimization of ply thicknesses with orientations of 0°, 90
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Article
Using response surface approximations in fuzzy set based design optimization
The paper focuses on modelling uncertainty typical of the aircraft industry. The design problem involves maximizing a safety measure of an isotropic plate for a given weight. Additionally, the dependence of th...
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Chapter
Genetic Algorithms for Optimization of Composite Laminates
The design of composite laminates is a combinatorial problem well suited for solution via genetic algorithms. However, the number of analyses required for genetic optimization of even single laminates may be m...
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Chapter
Optimization of Composite Structures Using Response Surface Approximations
Response surface techniques have been originally developed for improving designs based on testing in the laboratory or the field. These techniques fit simple functions, typically low order polynomials, to the ...
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Article
A FORTRAN 90 genetic algorithm module for composite laminate structure design
The design of the stacking sequence for a composite laminate involves a set of discrete variables (plymaterial and ply orientation), and is thus well-suited to genetic algorithms for design optimization. Such ...
