Estimation of flexural properties degradation in composite sandwich structures using fiber Bragg grating sensors

B. W. Jang M.D.; S. W. Park; C. G. Kim

doi:10.1117/12.776251

8 April 2008 Estimation of flexural properties degradation in composite sandwich structures using fiber Bragg grating sensors

B. W. Jang M.D., S. W. Park, C. G. Kim

Author Affiliations +

Proceedings Volume 6932, Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2008; 69322I (2008) https://doi.org/10.1117/12.776251
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2008, San Diego, California, United States

Abstract

The reflective spectrum of fiber Bragg grating (FBG) sensor under axial uniform stresses has a single peak with narrow bandwidth and high reflectivity. But, if the impact-induced damage is generated around FBG sensor attached on the sandwich panel, peak splits can occur due to strain gradient and transverse loading. The detection of the impact-induced damage is very important for structural safety, because this damage can degrade the flexural properties of sandwich panels. From the experiments, the impact-induced damages were detected by using the reflective spectrum change of FBG sensors. Bending stiffness, among the key flexural properties of sandwich panels were measured by 4-point bending test. By matching these results at each experiment, the flexural property degradation of sandwich panels can be estimated after impacts at different energy levels. The survivability of FBG sensors after impact was found to be acceptable, as 11 out of 17 FBG sensors remained intact after the impact test.

Citation Download Citation

B. W. Jang M.D., S. W. Park, and C. G. Kim "Estimation of flexural properties degradation in composite sandwich structures using fiber Bragg grating sensors", Proc. SPIE 6932, Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2008, 69322I (8 April 2008); https://doi.org/10.1117/12.776251

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