碳纤维-热塑性复合材料三维打印及其自监测

发布时间：2018-04-27 04:13

本文选题：碳纤维 + 热塑性材料　；参考：《浙江大学学报(工学版)》2017年09期

【摘要】：为改善热塑性材料三维打印结构件的力学性能,并对其所受应力应变状态进行实时自监测,提出一种连续碳纤维-热塑性复合材料(CFTC)并联臂三维打印技术,并基于碳纤维压阻效应开展打印结构自感知特性相关研究.以东丽T300B-3000-40B连续碳纤维丝和直径为1.75mm的聚乳酸(PLA)丝为例,通过实验确定最优打印工艺参数范围;制备CFTC试样并对其进行强度测试;针对结构件常见承载形式,研究CFTC试样在轴向拉伸和三点弯曲2种状态下的自感知特性.三维打印CFTC试样比纯PLA试样具有更高的强度,最大拉伸强度提高了540%以上;所打印的CFTC试样具有良好的自感知特性,拉应变灵敏度均值为3.148,弯曲应变灵敏度均值为1.31,线性相关系数大于0.94;研究结果为高强度自感知智能结构件的制造提供了一种新的技术方法.
[Abstract]:In order to improve the mechanical properties of three dimensional printing structure of thermoplastic materials and to monitor the stress and strain state in real time, a 3D printing technique for continuous carbon fiber / thermoplastic composite material parallel arm is proposed. Based on the Piezoresistive effect of carbon fiber, the self-sensing characteristics of print structure are studied. Taking Toray T300B-3000-40B continuous carbon fiber wire and polylactic acid lactic acid (1.75mm) wire as an example, the optimum printing process parameters range is determined through experiments; the CFTC sample is prepared and its strength is tested; according to the common load-bearing forms of structural parts, The self-sensing properties of CFTC specimens under axial tensile and three-point bending were studied. The maximum tensile strength of 3D printed CFTC specimen is more than 540% higher than that of pure PLA sample, and the printed CFTC sample has good self-sensing property. The mean value of tensile strain sensitivity and bending strain sensitivity are 3.148 and 1.31 respectively, and the linear correlation coefficient is greater than 0.94.The research results provide a new technical method for the manufacture of high-strength self-sensing intelligent structures.
【作者单位】：浙江大学机械工程学院浙江省三维打印工艺与装备重点实验室;
【基金】：国家自然科学基金资助项目(51575483) 浙江省公益基金资助项目(2016C31036)
【分类号】：TB332

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