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Invention of Metal-Based Smart Composites with Embedded Optical Fiber to Obtain a Function of Self-Monitoring

发明嵌入光纤的金属基智能复合材料以获得自我监控功能

基本信息

批准号：
11450254
负责人：
ASANUMA Hiroshi
金额：
$ 4.42万
依托单位：
Chiba University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B).
财政年份：
1999
资助国家：
日本
起止时间：
1999 至 2000
项目状态：
已结题

项目摘要

Metal-based smart composites with embedded fiber optic sensor were tried be fabricated to enable their self-monitoring. Aluminum and epoxy resin were used as matrices, and quartz-type single-mode optical fiber was used to form sensors in them. Asanuma developed a simple and low cost method to form sensitive fiber optic sensors in matrix materials. It can be explained as follows : A notch or multiple notches are made on optical fiber and it is embedded in a matrix. Then, it is tensile tested to break the fiber at the notches to form optical interference sensors. As they are made in the matrix, alignment of optical axes and encapsulation are not necessary.A transparent epoxy matrix specimen with one notch was tensile tested under monitoring optical transmission. When the embedded fiber fractured, visible laser leaked from the fractured part and optical intereference was observed during tensile test, which means that an interference type sensor was successfully formed.Optical loss type sensor was also tried to be made by making multiple notches. Effect of their spacing on fracture was investigated using epoxy matrix and it was clarified that the spacing has to be equal to or larger than 4mm. To decrease it and increase density or sensors, bending was more effective than tension. Pre-notched optical fiber could also be embedded in aluminum matrix without fracture by the interphase forming/bonding method which was developed by Asanuma, and similar results were successfully obtained In order to use this type of sensor for self-deformation monitoring of a CFRP/aluminum active laminate, 15 notches of 3mm spacings were formed in it. As the optical loss almost monotonically increased with increasing curvature of the laminate by its thermal deformation, the array of sensors proved to be effective for its defromation monitoring.

尝试制备了内嵌光纤传感器的金属基智能复合材料，以实现其自监测功能。该传感器以铝和环氧树脂为基体，以石英单模光纤为传感元件。Asanuma开发了一种简单而低成本的方法，在基质材料中形成敏感的光纤传感器。它可以解释如下：在光纤上制作一个或多个切口，并将其嵌入基质中。然后，进行拉伸试验，使光纤在切口处断裂，形成光学干涉传感器。由于它们是在基体中制成的，因此不需要光轴对准和封装。在监控光透射的情况下，对具有一个缺口的透明环氧树脂基体试样进行拉伸测试。当埋入光纤断裂时，可见光从断裂处泄漏，在拉伸过程中观察到光干涉现象，成功地形成了干涉型传感器，并尝试通过制作多个缺口来制作光损耗型传感器。使用环氧树脂基体研究了它们的间距对断裂的影响，并且澄清了间距必须等于或大于4 mm。为了减少它并增加密度或传感器，弯曲比拉伸更有效。通过Asanuma开发的界面形成/粘合方法，预切口光纤也可以不断裂地嵌入铝基体中，并成功获得了类似的结果。为了使用这种类型的传感器对CFRP/铝主动层合板进行自变形监测，在其上形成了15个间距为3 mm的凹槽。由于光学损耗几乎随着层合板的热变形曲率的增加而单调增加，传感器阵列被证明是有效的，用于其再成像监测。