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Showing 1 to 20 of 54 for “"composite laminate"”.
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Blending Methods for Composite Laminate Optimization
Composite panel structure optimization is commonly decomposed into panel optimization subproblems, with specified local loads, resulting in manufacturing incompatibilities between adjacent panel designs. Using genetic algorithms to optimize local panel stacking sequences allows panel populations of …
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Genetic Algorithms for Composite Laminate Design and Optimization
… string, to include a second string so that composite laminates comprised of multiple materials can be studied with greater efficiently. By using two strings, only minor adjustments to the basic GA were required. The modified GA was used to simultaneously minimize the cost and weight of a …
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Optimization Frameworks for Discrete Composite Laminate Stacking Sequences
Composite panel structure optimization is commonly decomposed into panel optimization subproblems, with specified local loads, resulting in manufacturing incompatibilities between adjacent panel designs. Using genetic algorithms to optimize local panel stacking sequences allows panel populations of …
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Experimental Nanoengineering of Multifunctionality into an Advanced Composite Laminate
Advanced structural fiber composite materials have lightweight, multi-directional, and tailorable properties which are vital for weight-critical applications such as aerospace vehicles. Nanoengineered aerospace-grade composites have been developed to have integrated multifunctionalities while …
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On the variability of composite laminate properties : prediction and minimization
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1996.
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Fatigue performance of nanoclay filled glass fiber reinforced hybrid composite laminate
Submitted in fulfilment of the requirements for the degree of Master of Engineering: Mechanical Engineering, Durban University of Technology, Durban, South Africa, 2017.
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Simulation approaches to support composite laminate analysis from early stage design
Composite laminates have enabled the creation of components that are lighter and stronger than their metallic equivalents, making them an enticing material for the development of novel components. However, the cost to build accurate and efficient structural analysis models of these components can …
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A Distributed Genetic Algorithm With Migration for the Design of Composite Laminate Structures
… general Fortran 90 framework for the solution of composite laminate design problems using a genetic algorithm (GA). The initial Fortran 90 module and package of operators result in a standard genetic algorithm (sGA). The sGA is extended to operate on a parallel processor, and a migration algorithm …
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An Investigation to Detect Delamination in Composite Laminated Plates Under Dynamic Loading
<p>In recent years composites have progressively been used for large-scale structures such as aircraft, ships, ground vehicles, and wind turbine blades. Traditional Nondestructive Evaluation (NDE) techniques have various limitations in assessing the performance of the large-scale composite …
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The development of a modified biaxial composite test specimen
Bi-axial testing of composite structures has been an important topic in the research community for some years now. Bi-axial test specimens in the past have typically been cruciform specimens with a tapered thickness gage section. This ensures that the specimen will fail under bi-axial loading …
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Numerical simulation of damage and progressive failures in composite laminates using the layerwise plate theory
The failure behavior of composite laminates is modeled numerically using the Generalized Layerwise Plate Theory (GLPT) of Reddy and a progressive failure algorithm. The Layerwise Theory of Reddy assumes a piecewise continuous displacement field through the thickness of the laminate and therefore …
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Sensitivity Analysis of Interface Fatigue Crack Propagation in Elastic Composite Laminates
Composite laminates are an important subject of modern technology and engineering. The most common mode of failure in these materials is probably interlaminar fracture (delamination). Delamination growth under applied fatigue loads usually leads to structural integrity loss of the composite …
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Design Optimization of a Composite Wing Box for High-Altitude Long-Endurance Aircraft
… of a HALE aircraft wing structure. A preliminary composite laminate structural design procedure is described which uses a NASTRAN-based Finite Element Analysis (FEA), and the Hierarchical Evolutionary Engineering Design System (HEEDS) MDO software to define a locus of acceptable, optimized wing …
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Prediction model for the onset of edge-effect delamination at holes in composite laminates
Composite laminates are prone to delamination at free edges, straight edges or at holes, due to the mismatch at interfaces where two adjacent plies have different fiber orientations and/or different material properties. The linear analysis of the mismatch at the edge results in a mathematical …
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Effects of stress on material properties, intrinsic and extrinsic behavior, and electromechanical response of stress-biased actuators
… (THin UNimorph Driver and sEnsoR). Thunder™ is a composite laminate actuator based on an elastic metal layer and a piezoelectric wafer bonded together with a thermoplastic material (LaRC-SI). On cooling from the processing temperature, the difference in thermal expansion between layers creates a …
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Modeling of ultrasonic processing
… processing of an aerospace-grade carbon-epoxy composite laminate. An ultrasonic (approximately 30 kHz) loading horn is applied to a small region at the laminate surface, which produces a spatially nonuniform strain energy field within the material. A fraction of this strain energy is dissipated …
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Design and Analysis of a Monocoque Chassis for an Electric Formula SAE Vehicle
… performance targets and competition regulations. Composite laminate designs are proposed and then integrated into a full-chassis structural design that is then analyzed for torsional stiffness in the ANSYS FEM package. Finally, potted insert design and avenues for future development are considered.
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Development of a reinforcing fibre light-guide for use as a damage sensor within composite structures
… indication of the extent of impact damage in a composite. This was achieved by using glass reinforcing fibres to produce a light-guide, which was embedded within a composite laminate. The laminate was then subjected to impact events or bending stresses of sufficient magnitude to cause damage. …
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Characterizing the Mechanical Properties of Composite Materials Using Tubular Samples
Application of composite materials to structures has presented the need for engineering analysis and modeling to understand the failure mechanisms. Unfortunately, composite materials, especially in a tubular geometry, present a situation where it is difficult to generate simple stress states that …
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