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首页> 外文期刊>The Journal of the Textile Institute >Experimental study on the bending fatigue behaviors of 3D five directional braided T-shaped composites
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Experimental study on the bending fatigue behaviors of 3D five directional braided T-shaped composites

机译：3D五向编织T形复合材料弯曲疲劳行为的实验研究

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摘要

The static three-point bending properties and cyclic bending fatigue performances of three-dimensional five-directional braided T-beam composite (3D5DBTC) have been investigated at room temperature. The fatigue life of 3D5DBTC under different stress levels was analyzed based on the obtained S-N curves. The load-displacement hysteresis loops curves and stiffness degradation curves were recorded to reveal the relationship between stiffness degradation and damage evolution. It is shown that there were three distinct stages corresponding respectively to matrix cracks, interface debonding, and fiber breaking in the whole fatigue loading. In addition, to understand the ultimate fracture failure mechanism of 3D5DBTC under the different fatigue loading conditions, the damage morphologies of 3D5DBTC after fatigue testing were observed by macrographs and SEM micrographs. The matrix crack and the resin-yarns interface debonding occurred on the flange while fiber breakages occurred in the web. Meanwhile, macrographs and SEM images confirm that fiber breaking is the dominant damage under the high stress level, while matrix cracking and interfacial debonding are the main failure modes at low stress level.
机译：在室温下研究了三维五向编织T型梁复合材料（3D5DBTC）的静态三点弯曲性能和循环弯曲疲劳性能。根据所得的S-N曲线，分析了3D5DBTC在不同应力水平下的疲劳寿命。记录了载荷-位移磁滞回线曲线和刚度退化曲线，以揭示刚度退化与损伤演化之间的关系。结果表明，在整个疲劳载荷下，存在三个不同的阶段，分别对应于基体裂纹，界面剥离和纤维断裂。此外，为了了解3D5DBTC在不同疲劳载荷条件下的最终断裂破坏机理，通过宏观图和SEM显微照片观察了3D5DBTC在疲劳试验后的破坏形态。法兰上发生基体裂纹和树脂-纱线界面剥离，而纤网中发生纤维断裂。同时，宏观图和SEM图像证实了在高应力水平下纤维断裂是主要的破坏，而在低应力水平下基体开裂和界面剥离是主要的破坏方式。

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