基于模量/应变波耦合特性的FBG碳纤维增强塑料复合材料拉伸断裂监测

刘宏月; 梁大开; 韩晓林; 芮棽

基于模量/应变波耦合特性的FBG碳纤维增强塑料复合材料拉伸断裂监测

刘宏月^1,2,,
梁大开³,
韩晓林^1,2,
芮棽^1,2

1.
东南大学土木工程学院, 南京 210096;
2.
东南大学江苏省工程力学分析重点实验室, 南京 210096;
3.
南京航空航天大学机械结构力学及控制国家重点实验室, 南京 210016

基金项目: 国家自然科学基金（51308108：10902024；51275239）；国家自然科学基金项目国际交流（51161120326）；教育部新世纪优秀人才支持计划（NCET-11-0086）；中国博士后科学基金（2013M540407）；江苏省博士后科研资助计划（1301026B）；航空科学基金（20090869009）；东南大学博士后重点科研资助计划资助课题

详细信息

通讯作者:
刘宏月，博士后，研究方向为光纤传感技术、光纤结构健康监测。E-mail：lhy320208@seu.edu.cn

中图分类号: TB332;TN247
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- 被引次数: 0
出版历程
- 收稿日期: 2013-01-20
- 修回日期: 2013-05-09
- 刊出日期: 2014-02-15

FBG fracture monitoring for CFRP based on coupling characteristic of modulus/strain wave

1.
School of Civil Engineering, Southeast University, Nanjing 210096, China;
2.
Jiangsu Key Laboratory of Engineering Mechanics, Southeast University, Nanjing 210096, China;
3.
State Key Laboratory of Mechanics and Control of Mechanical Structures, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China

摘要

摘要: 从光纤Bragg光栅（FBG）反射中心波长随碳纤维增强塑料复合材料（CFRP）拉伸试件表面应变变化敏感特性的角度，详细研究了拉伸过程中FBG中心波长的拉伸变化速率（即CFRP的宏观弹性模量）与复合材料内部断裂饱和状态的相关性和断裂瞬间试件表面的应变波响应特性，即：在拉伸过程中，CFRP拉伸试件的宏观弹性模量随着内部断裂的发生而不断减小，且在试件出现明显应力松弛状态前趋于平稳；应力松弛状态出现时，断裂区域表面接收的应变波响应略大于其他区域。通过设计相应排布形式，将FBG与CFRP断裂监测相结合，提出了一种基于FBG传感的CFRP断裂分阶段监测方法。该方法中传感探头直接与CFRP试件耦合，测量及传导光路全光纤化，可实现对CFRP断裂状态的绝对监测。
- 碳纤维增强塑料复合材料 /
- 光纤Bragg光栅 /
- 断裂监测 /
- 模量 /
- 应变波
Abstract: From the sensitivity of the fibre Bragg grating (FBG) center wavelength changing with strain changes on the surface of carbon fibre reinforced plastics (CFRP) composite, the correlation between the tensile rate of the FBG wavelength and the fracture status was investigated during the stretching process and the strain wave response characteristics of the specimen surface, that is, the elastic modulus of CFRP tensile specimens decreases with the increasing of the internal damage, and stabilizes before the appearance of the stress relaxation in the specimen, at which the strain response of acoustic emission received on the surface of the fracture area is slightly greater than the one in other areas. By combining FBG with the CFRP fracture monitoring, a CFRP fracture monitoring method based on the FBG has been proposed. The method coupling sensing probe directly with specimen has achieved the absolute monitoring of CFRP fracture state.
- carbon fibre reinforced plastics /
- fibre Bragg grating /
- fracture monitoring /
- modulus /
- strain wave