Detection of delamination in composite laminates using small-diameter FBG sensors

2002 ◽  
Author(s):  
Shin-ichi Takeda ◽  
Yoji Okabe ◽  
Nobuo Takeda
Keyword(s):  
Composite Laminates ◽  
Small Diameter ◽  
Fbg Sensors

Application of small-diameter FBG sensors for detection of damages in composites

2001 ◽  
Author(s):  
Yoji Okabe ◽  
Tadahito Mizutani ◽  
Shigeki Yashiro ◽  
Nobuo Takeda
Keyword(s):  
Small Diameter ◽  
Fbg Sensors

Structural Health Monitoring of Composite Laminates by Using Embedded FBG Optical Fiber Sensors

2005 ◽  
Vol 297-300 ◽  
pp. 2158-2163
Author(s):  
Won Seok Kim ◽  
Sang Hoon Kim ◽  
Jung Ju Lee
Keyword(s):  
Structural Health Monitoring ◽  
Health Monitoring ◽  
Composite Laminates ◽  
Composite Laminate ◽  
Failure Criteria ◽  
Fatigue Tests ◽  
Fiber Sensors ◽  
Structural Health ◽  
Fbg Sensors ◽  
Stress States

In this paper, a new Structural Health Monitoring (SHM) technique for composite laminates through the use of embedded FBG sensors is presented. This method monitors the ply stress states of a laminate and compares them with failure criteria continuously during structures’ service time. The ply stress state of each ply composing the composite laminate can be obtained by embedding three FBG sensors in the laminate based on the classical lamination theory. In this study FBG sensor embedded graphite/epoxy composite laminate specimens were fabricated. With ply stress states being monitored, tension and fatigue tests were performed until laminates’ failure. Experimental results show that laminates experience fracture when the ply stress states are beyond the boundaries of failure criteria. Embedded FBG sensors had good fracture strain and reliability. Therefore, critical damage can be detected by the ply stress states which are close to the boundaries of failure criteria.

Development of small-diameter optical fiber sensors for damage detection in composite laminates

2000 ◽  
Author(s):  
Kouji Satori ◽  
Yukio Ikeda ◽  
Yoshinori Kurosawa ◽  
Akihito Hongo ◽  
Nobuo Takeda
Keyword(s):  
Optical Fiber ◽  
Damage Detection ◽  
Composite Laminates ◽  
Small Diameter ◽  
Optical Fiber Sensors ◽  
Fiber Sensors

Debonding monitoring of a composite repair patch using small-diameter FBG sensors

2004 ◽  
Author(s):  
Shin-ichi Takeda ◽  
Takeharu Yamamoto ◽  
Yoji Okabe ◽  
Nobuo Takeda
Keyword(s):  
Small Diameter ◽  
Composite Repair ◽  
Repair Patch ◽  
Fbg Sensors
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