基于FBG的复合材料环形构件残余应变研究

为了解决因碳纤维/环氧树脂复合材料构件中树脂基体与碳纤维间的热膨胀系数存在差异, 热压成型后, 内部未释放的残余应力会使材料构件发生残余应变, 造成构件变形、影响制品质量的问题, 采用光纤布喇格光栅(FBG)传感器在线监测实验研究和有限元仿真分析相结合的研究方法, 进行了理论分析和实验验证, 采集了碳纤维/环氧树脂复合材料环形构件热压罐成型后表面残余应变变化实时数据。结果表明, 该构件下法兰根部应变释放情况复杂, 靠近支承位置处的残余应变释放受阻, 而其余监测点位的残余应变普遍在30με~90με的范围内, 与仿真结果相符; FBG传感器能对构件成型后残余应变释放历程进行多点位实时在线监测, 并实现对构件整体应变分布的分析和预警。该研究具有一定科学研究和工程应用意义。

Abstract

In order to solve the problems of component deformation and affecting manufacturing quality caused by the residual strain of material components, which is due to the residual stress after hot pressing by the difference of thermal expansion coefficient between resin matrix and carbon fiber in carbon fiber/epoxy resin composite components. The theoretical analysis and experimental verification were carried out by combining the on-line monitoring experimental research of fiber Bragg grating (FBG) sensor and finite element simulation analysis. The real-time data of surface residual strain of carbon fiber/epoxy composite ring components after hot pressing tank forming were collected. The results show that the strain release at the flange root is complex, the residual strain release near the support is blocked, and the residual strain at other monitoring points is generally 30με~90με. The results are consistent with the simulation results. FBG sensor can carry out multi-point real-time on-line monitoring of the residual strain release process after component forming, and realize the analysis and early warning of the overall strain distribution of the component. The research has certain scientific research and engineering application significance.

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李浩洋, 陈满意, 童杏林, 张翠, 魏敬闯, 何西琴, 孙建波, 耿东兵. 基于FBG的复合材料环形构件残余应变研究[J]. 激光技术, 2022, 46(5): 668. LI Haoyang, CHEN Manyi, TONG Xinglin, ZHANG Cui, WEI Jingchuang, HE Xiqin, SUN Jianbo, GENG Dongbing. Research on surface residual strain of composite ring component based on FBG[J]. Laser Technology, 2022, 46(5): 668.

基于FBG的复合材料环形构件残余应变研究

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