Effect of residual stress on the matrix fatigue cracking of rapidly cured epoxy/anhydride composites

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

doi:10.1016/j.compositesa.2017.07.007

Cited by 29 publications

(12 citation statements)

References 19 publications

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“…Joosten et al, who investigated and characterized interlaminar fatigue caused by residual stresses on epoxy composites, utilized the rapid reaction between epoxy and anhydride moieties. 96 They employed a system comprising of a cyclohexylmethyl-3,4-epoxy-cyclohexane carboxylate, bi-functional cycloaliphatic epoxy infusion resin with an anhydride hardener and imidazole catalyst in their laminate manufacture. Initial cure for each composite laminate was carried out using the Resin Transfer Molding (RTM) process.…”

Section: Rapid Cure Resinsmentioning

confidence: 99%

Multifunctionality in Epoxy Resins

2019

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Epoxy resin will continue to be in the forefront of many thermoset applications due to its versatile properties. However, with advancement in manufacturing, changing societal outlook for the chemical industries and emerging technologies that disrupt conventional approaches to thermoset fabrication, there is a need for a multifunctional epoxy resin that is able to adapt to newer and robust requirements. Epoxy resins that behave both like a thermoplastic and a thermoset resin with better properties are now the norm in research and development. In this paper, we viewed multifunctionality in epoxy resins in terms of other desirable properties such as its toughness and flexibility, rapid curing potential, self-healing ability, reprocessability and recyclability, high temperature stability and conductivity, which other authors failed to recognize. These aspects, when considered in the synthesis and formulation of epoxy resins will be a radical advance for thermosetting polymers, with a lot of applications. Therefore, we present an overview of the recent finding as to pave the way for varied approaches towards multifunctional epoxy resins.

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Section: Rapid Cure Resinsmentioning

confidence: 99%

Multifunctionality in Epoxy Resins

2019

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“…Moreover, the approach is superior to FEM in terms of computational efficiency and accuracy. 5-It has been noted that the Pagano's and McCartney's solutions [28][29][30][31] can also be derived from a fully stressbased variational approach.…”

Section: -mentioning

confidence: 99%

“…In the current paper, a novel variational model is developed to overcome the mentioned drawbacks and to deal with the problem of free-edge interlaminar stress and displacement analysis in laminate strips with general lay-ups (possibly made of many thin plies) under in-plane, bending and uniform thermal loading conditions. The analysis takes into account the effects of thermal residual stresses [29]. The one single fundamental assumption is that the inplane transverse and shear stresses are linear through-thickness of each ply.…”

Section: Introductionmentioning

confidence: 99%

Variational analysis of free-edge stress and displacement fields in general un-symmetric and thin-ply laminates under in-plane, bending and thermal loading

Hajikazemi

Paepegem

2018

Composites Part A: Applied Science and Manufacturing

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A variational approach based on the minimization of complementary energy is developed to determine accurately a complete solution for both free-edge stress and displacement distributions of a laminate with arbitrary lay-ups (possibly un-symmetric and made of thin plies) under combined in-plane, bending and thermal loading. The key idea is partitioning the total stresses/displacements in a laminate with free edges into unperturbed (without free edges) and unknown perturbation stresses/displacements caused by the presence of free edges. It enables the theory of variational stress-transfer to deal easily with both applied traction and displacement boundary conditions. A methodology is introduced to obtain displacement fields for a stress-based variational approach. The resulting stress and displacement fields exactly satisfy local equilibrium equations, strain-displacement relations together with all traction/displacement boundary and continuity conditions. By comparing the results with those obtained from the finite element method, the accuracy and computational efficiency of the developed model, is confirmed.

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“…Some studies have been done about anticipating residual stresses caused during the curing process, 14 and also, some other about effects of addition of nanoparticles 15 and cure cycle speed. 16 Some other researchers presented some optimization studies for minimizing residual stresses of fiber-reinforced polymer composites based on finding optimum values for the curing cycle parameters. 17,18…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of cooling conditions, MWCNTs and mandrel diameter effects on the thermal residual stresses of multi-layered filament-wound composite pipes

Amir-Ahmadi

Ghasemi

2020

Journal of Composite Materials

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This study employs numerical and experimental approaches to analyze effects of various filament-winding parameters, including mandrel diameter and cooling conditions, on the process-induced thermal residual stresses of composite and nanocomposite pipes. Simultaneous effects of the addition of multi-walled carbon nanotubes (MWCNTs) and the cooling conditions were also analyzed in detail. To accomplish this aim, a few composite and nanocomposite cylinders with various diameters in different cooling conditions were produced using filament-winding process and experimented. The incremental hole-drilling method using an integral inverse solution was employed for measuring the curing-induced residual stresses. The experimental findings confirm that using MWCNTs for reinforcing the matrix, choosing a slow cooling condition, and increasing the diameter generate less residual stresses during the process. Moreover, this study clearly showed that the addition of MWCNTs decreases the sensitivity of the structure to the effects of cooling conditions during the curing process. Therefore, finding optimum amounts of MWCNTs and cooling rate leads to the minimum cost of fabrication.

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Effect of residual stress on the matrix fatigue cracking of rapidly cured epoxy/anhydride composites

Cited by 29 publications

References 19 publications

Multifunctionality in Epoxy Resins

Multifunctionality in Epoxy Resins

Variational analysis of free-edge stress and displacement fields in general un-symmetric and thin-ply laminates under in-plane, bending and thermal loading

Experimental investigation of cooling conditions, MWCNTs and mandrel diameter effects on the thermal residual stresses of multi-layered filament-wound composite pipes

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