Thermal expansion of epoxy-fiberglass composite specimens

McElroy, D.L.; Weaver, F. J.; Bridgman, C.

doi:10.1007/bf00504243

Cited by 10 publications

(3 citation statements)

References 7 publications

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“…Therefore, it is expected that by increasing the process temperature the performance of the produced composite may be consequently increased as well. It is known that while the temperature increases, the thermal expansion coefficient of epoxy/fiberglass composites is being increased as well 43 . However, it increases with a different rate of change for low and for high temperature values.…”

Section: Taguchi Resultsmentioning

confidence: 99%

Multi-Objective Curing Cycle Optimization for Glass Fabric/Epoxy Composites Using Poisson Regression and Genetic Algorithm

et al. 2018

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In this study, a multi-parameter design of experiments, using Taguchi method, has been conducted in order to investigate the optimum curing conditions for glass fabric/epoxy laminated composites, followed by a statistical analysis and genetic algorithm optimization. Heating rate a, temperature T 1 and duration h 1 were treated as independent variables in a L 25 Taguchi orthogonal array addressing five levels each. Tensile load and flexural strength were examined as pre-selected quality objectives. The results of the analysis of variance performed showed that the significant parameters for both tensile and flexural strength were temperature and duration, at a 95% confidence level. The estimation of the curing parameters for optimum tensile and flexural performance was achieved with an error considerably lower than 1%. The Poisson regression analysis was introduced to achieve a highly accurate regression model, with R 2 greater than 97% for both optimization criteria. Finally, these two regression models were converted into a two-fold function for maximizing both criteria, and used as fitness function for a multi-objective optimization genetic algorithm.

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Section: Taguchi Resultsmentioning

confidence: 99%

Multi-Objective Curing Cycle Optimization for Glass Fabric/Epoxy Composites Using Poisson Regression and Genetic Algorithm

et al. 2018

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“…Three mathematical spheres where fitted to the measurements and the positions of their centers were used to form a reference plane. The CMM then executed the measurement pro- [27]. T is the temperature and defined within T ∈ [20,70] • C. Taking the uncertainty contribution from thermal expansion into account is not trivial for freeform objects.…”

Section: Calibration Of Calibrated Workpiecementioning

confidence: 99%

Development and metrological validation of a new automated scanner system for freeform measurements on wind turbine blades in the production

Lyngby

Nielsen

Chiffre

et al. 2019

Precision Engineering

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“…21 for measurements perpendicular to fibers, according to McElroy et al [1988]. The high end of that range is typical of the thermal expansion of epoxy, which ranges from 4.5 to 6.5 3 10…”

Section: Cmentioning

confidence: 99%

Using in situ vertical displacements to characterize changes in moisture load

Murdoch

Freeman

Germanovich

et al. 2015

Water Resources Research

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Changes in soil moisture content alter the load on underlying material, and we have developed a technique for characterizing this effect by using an extensometer to measure the displacement caused by the load change. The extensometer is pushed into soil at depths of 5 m or more, and displacement between two anchors separated by 1.5 m is measured with a resolution of better than 0.01 lm (10 28 m). The instrument is sensitive to load changes at the ground surface within a radial distance that is roughly twice its depth, potentially providing a method for averaging changes in water content over hundreds of m 2 or more. During a field trial at a site in South Carolina, compressive displacements in unsaturated saprolite were strongly correlated to rainfall with a calibration factor of 0.16 lm displacement per mm of rainfall 60.002 lm/mm (R 2 5 0.95). Estimates of the net change in water volume per unit area made using the calibration factor from rainfall were similar to independent estimates of evapotranspiration. The technique was affected by barometric pressure variations, but the sensitivity was less than expected and does not hinder meaningful application. A companion instrument demonstrated the displacement signal was repeatable.

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Thermal expansion of epoxy-fiberglass composite specimens

Cited by 10 publications

References 7 publications

Multi-Objective Curing Cycle Optimization for Glass Fabric/Epoxy Composites Using Poisson Regression and Genetic Algorithm

Multi-Objective Curing Cycle Optimization for Glass Fabric/Epoxy Composites Using Poisson Regression and Genetic Algorithm

Development and metrological validation of a new automated scanner system for freeform measurements on wind turbine blades in the production

Using in situ vertical displacements to characterize changes in moisture load

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