Investigation on the Mesoscopic Creep Behavior and Stress Effects of Triaxial Warp-Knitted Composites

IF 2.3 4区工程技术 Q1 MATERIALS SCIENCE, TEXTILES

Fibers and Polymers Pub Date : 2025-08-12 DOI:10.1007/s12221-025-01115-8

Geyi You, Xiaoping Gao, Junbo Xie, Jiawei Chen, Li Chen

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Abstract

Triaxial warp-knitted composites (TWKC) are widely used in wind turbine blades owing to the excellent mechanical properties and cost-effectiveness. Due to the viscoelasticity of TWKC, it is prone to creep which may compromise structural safety. This study investigated the mesoscopic creep behavior of TWKC using nanoindentation tests. The three-point bending creep behavior of TWKC at various stress levels were analyzed, and the creep failure mechanism was clarified. The Hookean–Kelvin–Kelvin (HKK) model was established for predicting creep displacement–time curves of TWKC. The results showed that the creep resistance of the fiber is superior to that of the interface, which in turn is superior to that of the matrix. The proposed model accurately predicts the creep behavior under different stress levels with fitting correlation coefficient all above 98%. This study provides theoretical guidance for the long-term creep mechanical properties of TWKC, and thus has advantage to the optimal design of the composites.

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三轴经编复合材料细观蠕变行为及应力效应研究

三轴经编复合材料（TWKC）由于其优异的力学性能和性价比，在风力发电机叶片中得到了广泛的应用。由于TWKC的粘弹性，容易发生蠕变，危及结构安全。采用纳米压痕试验研究了TWKC的细观蠕变行为。分析了TWKC在不同应力水平下的三点弯曲蠕变行为，阐明了其蠕变破坏机理。建立了Hookean-Kelvin-Kelvin （HKK）模型来预测TWKC的蠕变位移-时间曲线。结果表明，纤维的抗蠕变性能优于界面，而界面的抗蠕变性能又优于基体。该模型准确预测了不同应力水平下的蠕变行为，拟合相关系数均在98%以上。该研究为TWKC的长期蠕变力学性能研究提供了理论指导，有利于复合材料的优化设计。

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来源期刊

Fibers and Polymers 工程技术-材料科学：纺织

CiteScore

3.90

自引率

8.00%

发文量

267

审稿时长

3.9 months

期刊介绍： -Chemistry of Fiber Materials, Polymer Reactions and Synthesis- Physical Properties of Fibers, Polymer Blends and Composites- Fiber Spinning and Textile Processing, Polymer Physics, Morphology- Colorants and Dyeing, Polymer Analysis and Characterization- Chemical Aftertreatment of Textiles, Polymer Processing and Rheology- Textile and Apparel Science, Functional Polymers