基于准分布式FBG传感器的均质材料内部应变测试的试验研究  

Experimental Study of Homogeneous Material Internal Strain Measurement Based on Quasi-distributed FBG Sensors

作　　者：朱启荣[1,2] 沈维亮[2] 解明如[2] 杨国标[1,2] 

机构地区：[1]同济大学国家力学实验教学示范中心,上海200092 [2]同济大学航空航天与力学学院,上海200092

出　　处：《实验力学》2013年第4期475-480,共6页Journal of Experimental Mechanics

基　　金：同济大学中央高校基本科研业务费专项资金(058);国家自然科学基金项目(11272239)资助

摘　　要：采用环氧树脂材料作为试验载体,使用没有任何保护性封装的、运用波分复用技术在同一光纤上刻入三个布拉格光栅的基础FBG传感器,来监测液体树脂流动及固化成型的全过程,并使用固化成型的环氧树脂板进行三点弯曲试验。将所得数据与有限元模拟数值解进行比较,来验证在去除封装、将传感器自身应变影响降到最低的情况下,FBG传感网络是否依然能够有效地反映出试验对象在各种情况下的内部应变。本文给出了FBG光纤光栅在逐级静力荷载加载下材料内部三点弯曲的应变图,并通过数值计算分析了未封装光纤在复合材料内部受力过程中的力学性能。Taking epoxy resin as experimental carrier, the whole process of liquid epoxy resin flow and curing was monitored by basic FBG sensors. The sensors are without any protective packaging, and three Bragg gratings are carved on the same sensor fiber by using Wavelength Division Multiplexing technology. Three-point bending experiment was conducted for curing epoxy board. Data from the experiment were compared with finite element numerical solution to verify that whether FBG sensors network, which were removed packages and minimized the effect of itself strain, are still effective to reflect the internal strain of experiment object under various conditions. The internal strain diagram from fiber Bragg grating in three-point bending experiment under step static loading is presented in this paper, and through numerical simulation, mechanical property of bare fiber inside the composite material and subjected to internal-loading is analyzed.

关 键 词：FBG光纤光栅 均质材料 应变传感器 静力加载 

分 类 号：O348.9[理学—固体力学]