Experimental and theoretical investigation of non-Fickian moisture absorption of quartz/BMI laminates fabricated by preconditioned prepregs

Guloglu, Gorkem E.; Hurdelbrink, Keith R.; Anderson, Jacob P.; Altan, M. Cengiz

doi:10.1063/1.4942327

Cited by 3 publications

(3 citation statements)

References 16 publications

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“…Compared to approximate methods, one would expect the exact analytical solution of the one‐dimensional hindered diffusion model to yield more accurate characterization of the moisture absorption behavior. Nevertheless, the exact solution has been rarely used to describe the absorption dynamics . For instance, Aronhime et al seem to have used the exact solution of the 1D HDM to characterize the absorption behavior of an epoxy resin at multiple relative humidity levels.…”

Section: Proper Use Of Exact and Approximate Model Solutions To Recovmentioning

confidence: 99%

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Fast recovery of non-fickian moisture absorption parameters for polymers and polymer composites

2016

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Moisture absorption is known to detrimentally affect the mechanical integrity and durability of polymeric materials. Consequently, accurately characterizing the moisture diffusion into these materials is critical when predicting their service life behavior. The hindered diffusion model (HDM), that is, Langmuir-type absorption, has been widely used to successfully describe both Fickian and anomalous absorption behavior of polymeric materials. In this article, proper use of both exact and approximate solutions of the HDM model is illustrated on two material systems: nanoclay/epoxy composites and thin epoxy laminates. A parameter recovery technique, based on a modified version of the steepest descent search, is shown to accurately recover all absorption parameters simultaneously from experimental data. The absorption behavior predicted by the recovered parameters is then validated by long-term absorption data not used in the recovery process. The errors induced by approximate solutions are observed to be material-dependent and could be substantially larger compared to the exact solution. In addition, a novel method to computationally accelerate the recovery of the absorption parameters is proposed. The new technique uses the approximate absorption parameters as the initial guess. It is shown that this approach substantially reduces the computational effort by decreasing the number of iterations without compromising from accuracy. POLYM. ENG. SCI.,

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Section: Proper Use Of Exact and Approximate Model Solutions To Recovmentioning

confidence: 99%

“…It needs to be emphasized that very few researchers have used the exact solution of the HDM—or any other Fickian and non‐Fickian model—to characterize the absorption behavior . This might be due to the mathematical difficulty and considerable computational effort involved in the recovery of absorption parameters.…”

Section: Introductionmentioning

confidence: 99%

Fast recovery of non-fickian moisture absorption parameters for polymers and polymer composites

2016

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“…One of the biggest challenges faced by the C/BMI composite used in air superiority fighter is to withstand the moisture absorption experienced by the aircraft both in flight and on the ground. Thus, a higher ambient relative humidity (75–95% RH) or water immersion, which can allow more moisture to diffuse into the material, is selected in the hygrothermal ageing procedure to investigate the moisture absorption effects on mechanical properties of the C/BMI composite by aeronautical engineers . The hygrothermal ageing has been proven to have detrimental effects on quasi‐static mechanical properties of the C/BMI composite, such as the flexural strength, interlaminar shear strength (ILSS) and compressive strength, and the corresponding degradation mechanism is contributed by the plasticizing effect of absorbed water, hygrolysis of the matrix, interfacial debonding, and formation of microcracks in the composite .…”

Section: Introductionmentioning

confidence: 99%

Low‐velocity impact behavior of a carbon/bismaleimide composite proposed for supersonic flight simulation after hygrothermal cycling

et al. 2018

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The combined high temperature oxidation, humidity exposure, thermal cycling, and a low temperature period were simultaneously performed on a carbon fiber‐reinforced bismaleimide (C/BMI) composite to simulate the supersonic hygrothermal flight‐cycles on long durability of the C/BMI applied in supersonic aircraft. After a hygrothermal cycling for 300 times, the drop‐weight impact test and ultrasonic analysis were carried out to evaluate low‐velocity impact damage behavior of the composite caused by foreign objects during service. The fiber/matrix interface degradation caused by hygrothermal cycling was demonstrated through a parameter proposed by Sarasua (parameter b), which is shown to reflect the level of the interfacial bond by estimating the contribution of the interphase on the damping properties of composites through the dynamic thermomechanical analysis (DMA) test. A secondary increase of delamination area initiated from one long edge was detected for the first time in the hygrothermal cycled C/BMI composite impacted by energy higher than 20 J. After experiencing 300 combined ageing cycles, the damage model of C/BMI composite impacted by more than 20 J changes from the pine tree model to gyro model because of free‐edge delamination, resulting in a serious potential risk to the application of C/BMI composite laminates in aeronautics. POLYM. COMPOS., 40:E1588–E1599, 2019. © 2018 Society of Plastics Engineers

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Moisture absorption of composites with interfacial storage

Guloglu

Hamidi

Altan

2020

Composites Part A: Applied Science and Manufacturing

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Experimental and theoretical investigation of non-Fickian moisture absorption of quartz/BMI laminates fabricated by preconditioned prepregs

Cited by 3 publications

References 16 publications

Fast recovery of non-fickian moisture absorption parameters for polymers and polymer composites

Fast recovery of non-fickian moisture absorption parameters for polymers and polymer composites

Low‐velocity impact behavior of a carbon/bismaleimide composite proposed for supersonic flight simulation after hygrothermal cycling

Moisture absorption of composites with interfacial storage

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