【摘要】 为实现对三维编织复合材料制件损伤情况进行实时监测,提出了通过三维五向四步法在三维编织复合材料中嵌入碳纳米线传感器的方法,由于碳纳米线传感器与碳纤维具有相似性,因此碳纳米线嵌入三维编织复合材料制件后对其承载性能几乎没有影响。通过三点弯曲实验分析了碳纳米线在三维编织复合材料制件遭受外界应力时其电阻变化率与应力应变的相关性。实验结果显示其相关性为指数拟合关系,因此,三维编织复合材料的损伤状况可通过嵌入其中的碳纳米线传感器的电阻变化率与制件所承载的应力应变函数映射关系来进行实时监测。更多还原

【Abstract】 For the purpose of real-time detection on the damage of 3-D braided composite materials,this paper proposes the new way of the carbon nanowires sensor embedded into 3-D braided composite material by three-dimensional five-direction four-step method. Carbon nanowire sensor has similar property with carbon fibers,thus,it has little impact on the carrying performance after carbon nanowires are embedded into the 3-D braided composite material part. The paper analyzes the correlation of the rate of change of its resistance and strain on parts of 3-D braided composite materials by three point bending experiment.The experiment result shows that the resistivity of embedded carbon nanowires has exponential fitting relationship with the strain of 3-D braided composite material parts under stress. Hence,the damage of3-D braided composites can be monitored by the correlation function of the resistance change rate and the stress or strain.更多还原