Research on Influence of Matrix Component on the Mechanical Behavior of Multiaxial Warp-knitted Composites

Chen, Jiawei; Gao, Xiaoping; Zhao, Kang; Wu, Wei

doi:10.1007/s12221-022-0298-9

Cited by 7 publications

(3 citation statements)

References 27 publications

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“…At the initial stage of the reaction of the matrix system, the epoxy resin reacts with the curing agent to form linear elastic macromolecule chain and a secondary amino group. Secondly, the elastic chain generates a rigid 3D network macromolecule 35 . In high temperature environment, the collisions of macromolecules in the cross‐linked system are intensified, and the apparent activation energy of the cross‐linked system decreases, and the cross‐linked reaction becomes easier to carry out.…”

Section: Resultsmentioning

confidence: 99%

“…Secondly, the elastic chain generates a rigid 3D network macromolecule. 35 In high temperature environment, the collisions of macromolecules in the crosslinked system are intensified, and the apparent activation energy of the cross-linked system decreases, and the cross-linked reaction becomes easier to carry out. So…”

Section: Mechanism Of Performance Improvementmentioning

confidence: 99%

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Research on curing kinetics of multiaxial warp‐knitted composites

et al. 2023

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In this paper, the differential scanning calorimetry (DSC) was used to test the crosslinking reaction system between epoxy resin and curing agent, and the curing kinetic model of the resin system was established by means of phenomenal model. The optimal curing process was obtained based on DSC curve. The quadriaxial warp‐knitted composite specimens were prepared by vacuum‐assisted resin infusion (VARI). The effects of curing process on mechanism properties and failure mechanism of the composite specimens were studied experimentally. Results show that the cross‐linking reaction between epoxy resin and curing agent agrees with the autocatalytic reaction model and the curing kinetics model could be used to characterize the curing process of the matrix. The optimum curing process could be used to improve the interface properties between the matrix and the fiber, and the crack progress will be inhibited as the specimen bearing the external force, and the mechanical properties of the specimen is also improved significantly. Result could provide a theoretical basis for the study of curing kinetics of epoxy resin, the exploration of curing process of composite materials and improve the strength of composits.

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Section: Resultsmentioning

confidence: 99%

Section: Mechanism Of Performance Improvementmentioning

confidence: 99%

Research on curing kinetics of multiaxial warp‐knitted composites

et al. 2023

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“…The multiaxial warp‐knitted fabric has excellent mechanical properties in all directions as a composite material reinforcement and is widely used in fan blades, aerospace, construction, and other fields 9–11 and gradually replaces traditional materials. VARI molding process 12,13 is widely used for integral large‐size molding due to its low cost and excellent mechanical properties of molding materials 14 . Therefore, it is necessary to study the creep behavior of multiaxial warp‐knitted fabric resin matrix composite, accelerate the creep experiment, and establish a creep model.…”

Section: Introductionmentioning

confidence: 99%

Research and prediction of creep behavior of triaxial warp‐knitted composites by time–temperature equivalent principle

You,

Gao,

et al. 2023

Polymer Composites

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In this paper, the creep behavior of triaxial warp‐knitted composites (TWKC) was investigated. The TWKC specimens were prepared by applying vacuum‐assisted resin infusion (VARI), and the three‐point bending creep experiments at different temperatures were carried out. The shift factor was calculated based on the activation energy method, and the creep curve at 25°C within 105s was obtained according to the time–temperature equivalence principle, the time–temperature equivalent model was established, and the model was verified by measuring the long‐term creep data with self‐made instrument. There is approximately agreement between the prediction result and experimental one, which is less than 10% within 105s. The results show that the model could be used to predict the creep behavior of TWKC. The viscoelastic properties of the specimen were analyzed based on dynamic mechanical analysis (DMA), and the creep behavior of TWKC was further analyzed by acoustic emission and digital image correlation damage analysis.Highlights The viscoelasticity of TWKC was analyzed based on dynamic mechanical analysis (DMA), and the activation energy was calculated. Based on the activation energy method, the time–temperature equivalent model was established to predict the creep behavior of TWKC. The creep behavior of TWKC were further analyzed by acoustic emission (AE) and digital image correlation (DIC) damage analysis.

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