改性C/C材料梁结构四点弯高温应变光纤传感测量  

High Temperature Strain Measurement for Modified C/C Material Beam under Four-Points Bending Load by Fiber Optical Sensor

作　　者：乔通 王则力[1] 宫文然[2] 王智勇[1] QIAO Tong;WANG Ze-li;GONG Wen-ran;WANG Zhi-yong(Beijing Institute of Structure and Environment Engineering,Beijing 100076,China;Science and Technology on Reliability and Environment Engineering Laboratory,Beijing Institute of Structure and Environment Engineering,Beijing 100076,China)

机构地区：[1]北京强度环境研究所,北京100076 [2]北京强度环境研究所可靠性与环境工程技术重点实验室,北京100076

出　　处：《强度与环境》2019年第5期1-6,共6页Structure & Environment Engineering

摘　　要：本文根据梁结构四点弯模型挠度与应变的关系特点,采用自主研制的光纤高温应变复合传感器,在改性C/C材料结构表面用高温无机胶粘贴布设传感器,放入高温挠度试验机进行常温至800℃条件下的四点弯加载试验,获得不同挠度下光纤复合传感器所测的应变数据,并与按四点弯模型计算的参考应变作对比,相对误差1-范数平均值在10%以内。通过有限元进行四点弯模型仿真计算,获得不同挠度下试验件上的应变仿真数据和光纤复合传感器测量的应变仿真数据,二者相对误差为7.56%。高温挠度试验和有限元仿真结果均证明,在测量梁的弯曲应变时,光纤高温应变复合传感器测量结果大于挠度对应的梁的实际应变值,相对误差在10%以内。In this paper, according to the characters of the relationship between deflection and strain on four-points bending model of beam structure,the self-developed fiber optical high temperature strain sensors were laid on the surface of modified C/C material structure by high temperature inorganic adhesive. The structure with fiber optical sensors was put into high temperature deflection testing machine for four-points bending experiment at brand temperature from room temperature to 800℃. The strain data was measured by fiber optical composite sensor. Compared to the reference strain computed from four-points bending model, the average relative error of 1-norm was less than 10%. The four-bending model with fiber optical sensor was simulated by finite element to obtain theoretical data of strain under different deflection loads, and to compare the strain data of structure to that strain measured by fiber optical composite sensor. The relative error was 7.56%. The results of high temperature deflection test and finite element simulation show that when measuring the bending strain of the beam, the measurement result of the fiber optical high temperature strain composite sensor was larger than the actual strain value distributing on the beam corresponding to deflection, and the relative error was less than 10%.

关 键 词：改性C/C材料 高温应变 光纤传感 四点弯 

分 类 号：V416.4[航空宇航科学与技术—航空宇航推进理论与工程]