›› 2018, Vol. 39 ›› Issue (2): 759-764.doi: 10.16285/j.rsm.2016.0370

• Testing Technology • Previous Articles     Next Articles

Strain transfer of internal strain of model similar materials with optical fibre measurement

SUN Yang-yang1, WANG Yuan2, ZHANG Qing-hua1, DUAN Jian-li1, ZHANG Wen-yuan2, ZHANG Zheng-lin2, YOU Ze-wei2   

  1. 1. College of Defense Engineering, PLA University of Science and Technology, Nanjing, Jiangsu 210007, China; 2. State Key Laboratory of Disaster Prevention & Mitigation of Explosion & Impact, PLA University of Science and Technology, Nanjing, Jiangsu 210007, China
  • Received:2016-04-19 Online:2018-02-10 Published:2018-06-06
  • Supported by:

    This work was supported by the Development of the Testing Apparatus for Simulating and Instrumenting (51527810) and the National Natural Science Foundation of China for Young Scholars (51608528).

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Abstract: The optical fibre sensing technology has been widely used to measure the internal strain of similar material. However, the coupling between the optical fibre and similar materials has not yet been resolved. In previous studies, theoretical results of strain transfer cannot be validated in the experiments. A one-dimensional optical fibre Bragg grating (FBG) similar material was designed and realized using three layers of fibre-adhesive-similar material. The sensor provides a method to solve the problem of coupling between the fibre and similar material. The FGB sensor without coating layer was used as the sensing element, and the axial centre strain was measured by using the fibre embedded in the similar-material strain testing pieces. We investigated the behaviour of strain transfer using theoretical analysis, numerical simulation and a newly designed calibration. The results of the average strain transfer rate of the sensor obtained by different methods were very close, which demonstrated good coupling among fibre, adhesive and similar material. Moreover, the accuracy and reliability of theoretical analysis and numerical simulation were verified by a new calibration experiment. The method provides a feasible solution for the three-dimensional strain measurement of similar material in the model.

Key words: similar material, internal strain, strain transfer, optical fibre

CLC Number: 

  • O 319.56

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