【作者】 唐守锋；

【导师】 熊克；

【作者基本信息】 南京航空航天大学 ， 测试计量技术及仪器， 2005， 硕士

【摘要】 压电智能夹层(PZT SMART Layer)是利用改进的柔性印刷电路技术,把一个分布式压电传感器/驱动器网络预先复合到一片绝缘载体膜上形成薄层。在复合材料的制作过程中,可以把智能夹层嵌入到其内部,不仅可以实现对复合材料制作工艺过程的监测,还可以在复合材料工作时进行实时、在线的监测。在本文中,主要是在压电智能夹层的制备、电学性能、对复合材料力学基本性能的影响及载荷识别等方面进行了研究。因此,本文的研究对于实现利用压电智能夹层进行实时、在线的结构健康监测有重要的意义。 在本文中,首先,对当前的柔性印刷电路的生产工艺进行了适当的改进研究,制作了压电智能夹层,并把智能夹层作为一个附加的层嵌入到复合材料中,制作出嵌入智能夹层的复合材料力学试验件和夹具;第二,在嵌入智能夹层对复合材料力学性能影响的研究中,经三组对比试验证实了嵌入智能夹层对复合材料的轴向拉伸强度、层间拉伸强度、压缩强度的影响都在复合材料制作工艺的离散性范围之内。证明了嵌入智能夹层并没有对玻璃纤维复合材料的力学基本性能产生明显的影响;第三,在电学性能测试中,选择了适合本文材料的 Lamb激励信号的中心频率,并对压电智能夹层的响应信号随时间的稳定性,加载时和加载后的的稳定性,以及不同传感器响应的一致性进行了研究。以上力学基本性能和电学性能的研究结果,证明了压电智能夹层可以嵌入到本文复合材料中进行健康监测;第四,利用压电智能夹层进行了拉伸载荷识别研究。在对比试验中,首次发现压电智能夹层比压电片有良好的信号最大幅值――载荷的线性变化关系,重复性也较好,并且两种情况下信号最大幅值随加载(或卸载)的变化趋势相反,这一新的发现还需要进一步的解释;第五,针对机翼盒段有加强筋的碳纤维复合材料面板设计并制作了压电智能夹层,并对利用压电智能夹层在机翼盒段上初步实现载荷识别给出了构想。 本课题获得了国家自然科学基金项目(90205031)“智能夹层的研究”的资助更多还原

【Abstract】 PZT SMART Layer is a thin film that having been compounded by a distributed sensor/actuator network and insulated carrier film making use of improved Flex Print circuit technique in advance. During the manufacture of composite, we can imbed the SMART Layer into its inner part, which the SMART Layer can not only monitor the manufacturing process of composite, but also can carry out real time, on-line monitoring for composite in service. In this text, we having mainly researched into the manufacturing, electrical performance of the PZT SMART Layer, and the influencing on mechanical performance of composite, the identifying of load etc. Therefore, these researches in this text have an important influence on carrying out real time, on-line structural health monitoring making use of PZT SMART Layer. In this text, first, we have made some appropriate improvement researches to the production craft of the Flex Print circuit at present, have manufactured PZT SMART Layer and composite mechanics experiment specimen embedded SMART Layer that regarding it as an additional layer; The second, through the research of imbedding SMART Layer has influenced on mechanical performance of composite, it has been confirmed by three groups contrasting experiment that the influence to composite axial tension strength, flatwise tension strength and compression strength is within the dispersing scope of composite manufacturing craft. Therefore, the result shows that even imbedding SMART Layer in glass fiber composite, the influence on mechanical performance of composite is negligible; The third, we have chosen the center frequency of actuator signal that is appropriate for the material in the research, and have researched electricial performance of PZT SMART Layer, such as the stability along with time, the stability of loading and after loaded, the consistency of sensors. In a word, from the above mentioned results of mechanical and electrical performance, we can conclude that PZT SMART Layer can be imbedded in composite and carry out health monitoring; The fourth, we have carried on identifying of tensional load making use of PZT SMART Layer. By the contrasting experiment, we have first discovered that PZT SMART Layer has more favorable linear relation of signal maximum magnitude – load and repeatability than PZT, and the trend that signal MAX. magnitude changes along with loading(or unloading) is opposite, this new detection still need to be further interpretative; The fifth, we have designed and manufactured PZT SMART Layer aimed at carbon fiber composite board strengthened with tendon of aerofoil box. and have also made a speculation that preliminary realizing the identifying of load in aerofoil box using PZT SMART Layer. This topic acquired the national natural science fund item (90205031) "the research of the SMART Layer"更多还原