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Title
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Ply level uncertainty effects on particle swarm optimization of composite structures
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Type
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Refereeing
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Keywords
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composite laminate, uncertainty, reliability, Monte Carlo simulation, particle swarm optimization
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Abstract
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Composite materials are popular in aerospace structures because of their high stiffness to weight ratio. However, the structural design of composites remains a challenging task because of uncertainty. It is important to incorporate uncertainty into the design of composite structures. Stochastic failure envelopes and the distributions of the strength parameters are obtained for AS4/8552 carbon-epoxy laminated composite while considering the material property and ply angle uncertainties. The effect of material and ply angle uncertainty on the strength parameters is quantified. Reliability analysis for a laminated composite, subjected to axial loading, is performed using Monte Carlo simulation. Reliability analysis shows that probability of failure will be overestimated if material uncertainty is ignored. Particle swarm optimization is used for minimum weight design of the composite laminates subjected to various in-plane loadings. Instead of considering deterministic failure curves or strength values as the constraint for optimization, a range of strength values and curves are considered to get a range of weights. The effect of ply level uncertainty on failure envelope, reliability and optimal design of composite structures are quantified.
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Researchers
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Hadi Ghashochi Bargh (Referee)
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