Fiber optic strain monitoring of textile GFRP during RTM molding and fatigue tests by using embedded FBG sensors

Tatsuro Kosaka; Katsuhiko Osaka; Satoru Nakakita; Takehito Fukuda

doi:10.1117/12.483450

5 August 2003 Fiber optic strain monitoring of textile GFRP during RTM molding and fatigue tests by using embedded FBG sensors

Tatsuro Kosaka, Katsuhiko Osaka, Satoru Nakakita, Takehito Fukuda

Author Affiliations +

Proceedings Volume 5056, Smart Structures and Materials 2003: Smart Structures and Integrated Systems; (2003) https://doi.org/10.1117/12.483450
Event: Smart Structures and Materials, 2003, San Diego, California, United States

Abstract

This paper describes cure and health monitoring of glass fiber reinforced plastics (GFRP) textile composites both during a resin transfer molding (RTM) process and in loading tests. Carbon fiber reinforced plastics (CFRP) textile composites also were used for a comparative study. Fiber Bragg grating (FBG) fiber optic sensors were embedded in FRP to monitor internal strain. From the results of cure monitoring, it was found that the embedded FBG sensors were useful to know when cured resin constrained fibers. It also appeared that specimens were subjected to friction stress resulted from difference of coefficient of thermal expansion between FRP and a stainless steel mold in cooling process of RTM molding. After the molding, tensile and fatigue tests were conducted. The results of tensile tests showed that output of the embedded FBG sensors agreed well that of surface-bonded strain gauges despite deterioration of reflected spectra form the sensors. From the results of fatigue tests, the FBG sensors showed good status until 100,000 cycles when specimens had no damage. From these results, it can be concluded that embedded FBG sensors have good capability of monitoring internal strain in textile FRP both during RTM process and in service.

Citation Download Citation

Tatsuro Kosaka, Katsuhiko Osaka, Satoru Nakakita, and Takehito Fukuda "Fiber optic strain monitoring of textile GFRP during RTM molding and fatigue tests by using embedded FBG sensors", Proc. SPIE 5056, Smart Structures and Materials 2003: Smart Structures and Integrated Systems, (5 August 2003); https://doi.org/10.1117/12.483450

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