大型复合材料结构快速无损检测与损伤识别方法研究

项目名称： 大型复合材料结构快速无损检测与损伤识别方法研究

项目编号： No.51305458

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 机械、仪表工业

项目作者： 单宁

作者单位： 中国人民武装警察部队工程大学

项目金额： 26万元

中文摘要： 针对大型复合材料结构微缺陷快速实时检测的迫切需求，以碳纤维铺层复合材料为主要研究对象，建立其激光热弹激发超声的数学模型，研究超声在复合材料内部的传播变化规律；提出一种适用于多个超声信息特征拾取的连续分布式光纤F-P传感器研制思想，研究连续分布式光纤F-P超声传感机理，分析影响传感器拾取精度的各种因素，结合大型复合材料结构特性，研究传感器的感应阵列分布原则，优化设计分布监测点，构建传感器多点阵列，以保证传感器探测多个超声信息的灵敏度；研究复合材料损伤识别算法，构建快速定性化激光超声检测系统。通过上述研究，可望揭示复合材料中激光热弹激发超声的机理和超声传播的特性，实现连续分布式光纤F-P超声传感器的实用化和商品化，建立大型复合材料结构快速实时在线检测新方法。项目的研究成果对于我国复合材料技术的快速发展具有重要意义，也可以为我国无损检测新技术的开拓提供理论和实验基础。

中文关键词： 超声检测；复合材料；激光超声；光纤传感技术；法布里-珀罗干涉仪

英文摘要： Aim at imminence requirement of rapidly and real time test for large-scale composite materials structure, mathematics model of thermoelastic ultrasound generation by laser in carbon fiber laminated composite materials is built. Diffuse and change law of ultrasound is studied in the composite materials. The develop thought of continuous distributed optical fiber F-P sensor for collect multi-ultrasound information is put forward. Continuous distributed optical fiber ultrasound sensing theory is studied. And each factor that influence collect precision of sensor is analyzed. Induction array distributing principle of sensor is studied based on the characteristic of large-scale composite materials structure. Distributing test point is optimized and designed. The multi-point array of sensor is constructed in order to ensuring the sensor's sensitivity for detecting multi-ultrasound information. The arithmetic of damage recognition on composite materials is studied. The rapidly and qualitative detection system of laser ultrasound is constructed. Through above studies, the theory of thermoelastic ultrasound generation by laser and diffuse characteristic of ultrasound in composite materials will be opened out. And continuous distributed optical fiber ultrasound sensor's practicality and commodity will be realized. New m

英文关键词： ultrasonic testing；composite materials；laser ultrasound；optical fiber sensing technology；Fabry-Perot interferometers