Impact tests of composite sandwich beam with embedded fiber Bragg grating sensors

被引：0
|
作者：
Pei H. [1 ]
Wei Y. [1 ]
Chen Y. [1 ]
Wan L. [1 ]
Liu W. [1 ]
机构：
[1] College of Civil Engineering, Nanjing Tech University, Nanjing
来源：
Jianzhu Jiegou Xuebao/Journal of Building Structures | 2019年 / 40卷
关键词：
Bending behavior; Composite sandwich beam; FBG sensor; Low velocity impact;
D O I：
10.14006/j.jzjgxb.2019.S1.037
中图分类号：
学科分类号：
摘要：
A composite sandwich beam, which consists of a laminated paulownia wood core with fiber cloths on the upper and lower panels of the core, was integrally molded using the vacuum introduction process. In order to monitor the internal damage of the composite beam, fiber Bragg grating (FBG) sensors were embedded in precut grooves in the longitudinal direction of the paulownia wood core before applying fiber cloths to the core. A static four-point repeated bending test was carried out on the sandwich beam. The data of the embedded FBG sensors and the externally attached resistance strain gauges were compared and analyzed. It was found that the FBG sensors can reflect the working condition of the sandwich beam as a whole when bending. A low-speed impact test was then carried out on the sandwich beam. During the impact process, the FBG sensors can effectively monitor the variation of internal strain of the sandwich beam, but it was limited by the sampling frequency of the acquisition equipment, and thus cannot fully reflect the details of the impact. After the impact, the residual bending capacity of the sandwich beam was tested. The undamaged FBG sensors were still able to reflect the working state of the sandwich beam after damage. © 2019, Editorial Office of Journal of Building Structures. All right reserved.
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页码：278 / 284
页数：6
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