Monitoring of non-uniform strains and progressive damage in honeycomb skin by complex Bragg reflection spectrum analysis

Jiyun Lu; Kan Bian; Dakai Liang; Shulin Liu

doi:10.1117/12.2186728

17 July 2015 Monitoring of non-uniform strains and progressive damage in honeycomb skin by complex Bragg reflection spectrum analysis

Jiyun Lu, Kan Bian, Dakai Liang, Shulin Liu

Author Affiliations +

Proceedings Volume 9524, International Conference on Optical and Photonic Engineering (icOPEN 2015); 95240N (2015) https://doi.org/10.1117/12.2186728
Event: International Conference on Optical and Photonic Engineering (icOPEN2015), 2015, Singapore, Singapore

Abstract

An analysis method of spectrum was proposed to assess the damage of honeycomb structures. The non-homogeneous strain fields of honeycomb cell walls were obtained by finite element analysis when tension was applied on the honeycomb structures. Spectrum changes of FBG sensors stuck on the cell walls were monitored and analyzed. Our analysis revealed that spectral bandwidth was broadened from 1nm to 3.5nm and spectrum was split to 12 peaks. The changes of light intensity of secondary peak corresponded to inflection points of load-displacement curves. The regular variations of spectrum were able to indicate progressive damage of honeycomb structures.

Citation Download Citation

Jiyun Lu, Kan Bian, Dakai Liang, and Shulin Liu "Monitoring of non-uniform strains and progressive damage in honeycomb skin by complex Bragg reflection spectrum analysis", Proc. SPIE 9524, International Conference on Optical and Photonic Engineering (icOPEN 2015), 95240N (17 July 2015); https://doi.org/10.1117/12.2186728

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