Life cycle strain mapping of composite airframe structures by using FBG sensors

K. Sekine; I. Takahashi; M. Kume; H. Takeya; Y. Iwahori; S. Minakuchi; N. Takeda; Y. Koshioka

doi:10.1117/12.879882

14 April 2011 Life cycle strain mapping of composite airframe structures by using FBG sensors

K. Sekine, I. Takahashi, M. Kume, H. Takeya, Y. Iwahori, S. Minakuchi, N. Takeda, Y. Koshioka

Proceedings Volume 7981, Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2011; 79812K (2011) https://doi.org/10.1117/12.879882
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2011, San Diego, California, United States

Abstract

The objective of this work is to develop a system for monitoring the structural integrity of composite airframe structures by strain mapping over the entire lifecycle of the structure. Specifically, we use fiber Bragg grating sensors to measure strain in a pressure bulkhead made of carbon fiber reinforced plastics (CFRPs) through a sequence of lifecycle stages (molding, machining, assembly, operation and maintenance) and detect the damage, defects, and deformation that occurs at each stage from the obtained strain distributions. In previous work, we have evaluated strain monitoring at each step in the FRP molding and machining stages of the lifecycle. In the work reported here, we evaluate the monitoring of the changes in strain that occur at the time of bolt fastening during assembly. The results show that the FBG sensors can detect the changes in strain that occur when a load is applied to the structure during correction of thermal deformation or when there is an offset in the hole position when structures are bolted together. We also conducted experiments to evaluate the detection of damage and deformation modes that occur in the pressure bulkhead during operation. Those results show that the FBG sensors detect the characteristic changes in strain for each mode.

Citation Download Citation

K. Sekine, I. Takahashi, M. Kume, H. Takeya, Y. Iwahori, S. Minakuchi, N. Takeda, and Y. Koshioka "Life cycle strain mapping of composite airframe structures by using FBG sensors", Proc. SPIE 7981, Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2011, 79812K (14 April 2011); https://doi.org/10.1117/12.879882

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