Strength characteristic and failure criterion of flexible multi-axial warp-knitted fabrics coated with polyurethane on single side

Guo, Nangkuo; Sun, Mingliang; Cheng, Liang; Jiang, Chunyan; Chen, Wenhao; Jing, Lingxiao

doi:10.1177/1528083718779448

Cited by 8 publications

(7 citation statements)

References 14 publications

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“…Multiaxial warp-knitted fabrics (MWFs) are widely used in the field of wind turbine blades since their unique structure and excellent mechanical properties in all directions. [1][2][3][4] The curing process changes the properties of the matrix by influencing the cross-linking reaction between the epoxy resin and the curing agent, and ultimately effect the mechanical properties of wind turbine blades. In order to obtain higher mechanical properties of the wind turbine blades, it is important to analyze the mechanism of cross-linking reaction in the matrix system, set up a reasonable curing process to control the cross-linking reaction and finally achieve the purpose of improving mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

“…Multiaxial warp‐knitted fabrics (MWFs) are widely used in the field of wind turbine blades since their unique structure and excellent mechanical properties in all directions 1–4 . The curing process changes the properties of the matrix by influencing the cross‐linking reaction between the epoxy resin and the curing agent, and ultimately effect the mechanical properties of wind turbine blades.…”

Section: Introductionmentioning

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: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Research on curing kinetics of multiaxial warp‐knitted composites

et al. 2023

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“…Many engineering problems include creep 7,8 mainly exists in fan blades, bridges, parts and other places and has a great impact on safety performance of structure part. 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][10][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.…”

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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“…It is known that loop geometry strongly depends on the raw material of yarns [8]. Knits used for personal protection have to have enhanced mechanical strength properties, which strongly depend on knitting pattern and structural characteristics [3,9,10]. On the other hand, garments for personal protection also have to ensure good comfort properties [11].…”

Section: Introductionmentioning

confidence: 99%

Ultra-Strong Knits for Personal Protective Equipment

et al. 2020

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This work focused on the development of ultra-strong knitted fabrics for personal protective equipment used for protection against mechanical damages. Such knits have to have enhanced mechanical strength properties, which strongly depend on knitting pattern and structural characteristics. Six variants of weft knitted structures were developed and knitted from ultra-high molecular weight polyethylene and additional elastomeric component. The elastomeric component was used to increase the elasticity and toughness of knits; however, it had a high influence on mechanical properties, as well. The performed mechanical tests allowed us to identify dependence of mechanical properties, such as breaking force and elongation at break and resistance to abrasion, tearing, cutting and puncture, on architecture and structural parameters of the knits. Obtained results demonstrate that elastomeric component has high influence on mechanical properties knits and can change the principal mechanical behaviour of knits.

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Strength characteristic and failure criterion of flexible multi-axial warp-knitted fabrics coated with polyurethane on single side

Cited by 8 publications

References 14 publications

Research on curing kinetics of multiaxial warp‐knitted composites

Research on curing kinetics of multiaxial warp‐knitted composites

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

Ultra-Strong Knits for Personal Protective Equipment

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