Rapidly cured epoxy/anhydride composites: Effect of residual stress on laminate shear strength

Agius, Steven; Joosten, Mathew; Trippit, B; Wang, Chun H.; Hilditch, Tim

doi:10.1016/j.compositesa.2016.06.013

Cited by 46 publications

(22 citation statements)

References 14 publications

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“…The state-of-the-art fast curing epoxy formulations for CFRPs typically includes epoxy resin and hardener (amines or anhydrides) which are kitted as a two-component system, owing to their extremely limited shelf life after being mixed prior to use [ 14 , 15 ]. Compared with two-component epoxy systems, a one-component epoxy resin takes away the hassle of on-site weighting, blending, and de-gassing, especially for plants that have few or no special automation in their infusion process [ 16 , 17 ].…”

Section: Introductionmentioning

confidence: 99%

A One-Component, Fast-Cure, and Economical Epoxy Resin System Suitable for Liquid Molding of Automotive Composite Parts

et al. 2018

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Imidazole cured epoxy resin systems were evaluated for one-component, fast-curing resins for liquid molding of automotive composite parts according to industry requirements. It was demonstrated that an epoxy resin-1-(cyanoethyl)-2-ethyl-4-methylimidazol(EP-1C2E4MIM) system would cure in a few minutes at 120 °C, while exhibiting acceptable pot life, viscosity profiles, and low water absorption. Moreover, this system yielded high Tg parts with mechanical properties similar to the amine-epoxy systems, which are the mainstream two-component epoxy resin systems for automobiles.

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Section: Introductionmentioning

confidence: 99%

A One-Component, Fast-Cure, and Economical Epoxy Resin System Suitable for Liquid Molding of Automotive Composite Parts

et al. 2018

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“…The residual strain-based assessment in this study still achieves this end goal, but the predictions are significantly more accurate. Residual strains are known to affect the remnant strengths of laminates [ 31 ] and thus the high correlation is probably due to this effect. Furthermore, given the high levels of strain measured and the strong correlation between residual strain and failure load, the correlation suggests computational models that attempt to predict the strength of laminates containing fibre waviness could be improved by incorporating the residual stresses at the location of the defect.…”

Section: Discussionmentioning

confidence: 99%

An experimental study on the manufacture and characterization of in-plane fibre-waviness defects in composites

et al. 2018

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A new method has been developed for creating localized in-plane fibre waviness in composite coupons and used to create a large batch of specimens. This method could be used by manufacturers to experimentally explore the effect of fibre waviness on composite structures both directly and indirectly to develop and validate computational models. The specimens were assessed using ultrasound, digital image correlation and a novel inspection technique capable of measuring residual strain fields. To explore how the defect affects the performance of composite structures, the specimens were then loaded to failure. Predictions of remnant strength were made using a simple ultrasound damage metric and a new residual strain-based damage metric. The predictions made using residual strain measurements were found to be substantially more effective at characterizing ultimate strength than ultrasound measurements. This suggests that residual strains have a significant effect on the failure of laminates containing fibre waviness and that these strains could be incorporated into computational models to improve their ability to simulate the defect.

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“…O'brien et al 2001Saseendran et al (2016,2017) -- (Meuwissen et al, 2004;Mahnken, 2013) FRP FRP Kravchenko et al, 2016Kravchenko et al, , 2017Yuan et al, 2018(Terada et al, 2013Terada et al, 2014) -FRP FRP Maxwell FRP FRP 2 ( Agius et al, 2016;Hirsekorn et al, 2018)…”

Section: Frpunclassified

Determination of macroscopic viscoelastic properties as well as macroscopic thermal deformation and cure-shrinkage properties of fiber reinforced plastics in consideration of cure process

Saito

Yamaguchi

Moriguchi

et al. 2019

Transactions of the JSME (In Japanese)

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This study presents a method of determining the macroscopic viscoelastic properties as well as the macroscopic coefficients of thermal expansion and cure-shrinkage of fiber-reinforced plastics (FRP) in consideration of the dependence of the viscoelastic properties of the resin used in the matrix phase on the degree of cure (DOC). The DOC-dependent viscoelastic material behavior of the resin is represented by the generalized Maxwell model and is accompanied with nonmechanical strains such as thermal strain and cure shrinkage. Within the framework of computational homogenization, a series of numerical material tests (NMTs) are conducted on a representative volume element (microstructure) with different DOCs to discretely evaluate the macroscopic viscoelastic properties. On the assumption that the macroscopic material behavior can be represented by the anisotropic version of the generalized Maxwell model, we originally propose a method to determine the macroscopic viscoelastic properties and the macroscopic coefficients of thermal expansion and cure-induced shrinkage, both of which are functions of DOC. After numerical examples to determine these properties for a specific unit cell of FRP are presented, a simple numerical verification is carried out to demonstrate that the proposed method is capable of determining the DOC-dependent macroscopic viscoelastic properties associated with mechanical and non-mechanical strains.

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Rapidly cured epoxy/anhydride composites: Effect of residual stress on laminate shear strength

Cited by 46 publications

References 14 publications

A One-Component, Fast-Cure, and Economical Epoxy Resin System Suitable for Liquid Molding of Automotive Composite Parts

A One-Component, Fast-Cure, and Economical Epoxy Resin System Suitable for Liquid Molding of Automotive Composite Parts

An experimental study on the manufacture and characterization of in-plane fibre-waviness defects in composites

Determination of macroscopic viscoelastic properties as well as macroscopic thermal deformation and cure-shrinkage properties of fiber reinforced plastics in consideration of cure process

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