Strain monitoring of composite pressure vessel with thin metal liner using fiber Bragg grating

Jun-qing Zhao; Rong-guo Wang; Xiao-dong He; Wen-bo Liu

doi:10.1117/12.840654

20 October 2009 Strain monitoring of composite pressure vessel with thin metal liner using fiber Bragg grating

Jun-qing Zhao, Rong-guo Wang, Xiao-dong He, Wen-bo Liu

Proceedings Volume 7493, Second International Conference on Smart Materials and Nanotechnology in Engineering; 74930F (2009) https://doi.org/10.1117/12.840654
Event: Second International Conference on Smart Materials and Nanotechnology in Engineering, 2009, Weihai, China

Abstract

Composite pressure vessel with thin metal liner has the advantage of both composite and metal. Due to the difference of elastic strain limits of composite and metal, there is problem of the compatibility of deformation. Nine fiber Bragg gratings were bonded to the surface of longitudinal and hoop directions of pressure vessel to monitor the strain status during 4.5MPa service pressure condition. The measured strain by the Bragg sensor is perfectly linear with the applied force. However, the hoop strain decreased as loading process and increased as unloading process, it is also negative value on middle part of the dome. The phenomena had been discussed in this investigation. As a smart structure Bragg sensor can detect the real strain state of composite pressure vessel and is suitable for damage monitoring in service. Analyzing result shows the pressure vessel can work safely with the applied hydrostatic pressure.

Citation Download Citation

Jun-qing Zhao, Rong-guo Wang, Xiao-dong He, and Wen-bo Liu "Strain monitoring of composite pressure vessel with thin metal liner using fiber Bragg grating", Proc. SPIE 7493, Second International Conference on Smart Materials and Nanotechnology in Engineering, 74930F (20 October 2009); https://doi.org/10.1117/12.840654

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