Damage detection in woven-composite materials using embedded fiber-optic sensors

1991 ◽  
Author(s):  
Philippe Bonniau ◽  
Jean Chazelas ◽  
Jerome Lecuellet ◽  
Francois Gendre ◽  
Marc J. Turpin ◽  
...  
Keyword(s):  
Composite Materials ◽  
Damage Detection ◽  
Fiber Optic ◽  
Fiber Optic Sensors ◽  
Woven Composite

scholarly journals Fiber Optic Sensors for Damage Detection in Composite Materials

1997 ◽  
Author(s):  
Anand Asundi
Keyword(s):  
Composite Materials ◽  
Damage Detection ◽  
Monitoring System ◽  
Fiber Optic ◽  
Fiber Optic Sensors ◽  
Design Rules ◽  
Interferometric Sensors ◽  
On Line ◽  
Proper Design

An absence of proper design rules has limited the application of composite materials to specific areas. However, within these application areas there is still a need to regular monitor the component resulting in significant downtime and loss of revenue. To overcome this it is proposed to have an on-line monitoring system capable of global checking of the component. Fiber optic polarimetric sensors are chosen in this study to globally characterize the health of a component. Polarimetric sensors have better sensitivity than intensity sensors and at the same time are more rugged than interferometric sensors. In this study, the effect of debonds and fiber breakages are investigated in composite bend specimens.

Application of fiber optic sensors for elevated temperature testing of polymer matrix composite materials

2011 ◽  
Vol 18 (1-2) ◽  
pp. 109-116
Author(s):  
John Montesano ◽  
Marina Selezneva ◽  
Cheung Poon ◽  
Zouheir Fawaz ◽  
Kamran Behdinan
Keyword(s):  
Elevated Temperature ◽  
Composite Materials ◽  
Matrix Composite ◽  
Polymer Matrix ◽  
Optical Sensors ◽  
Fiber Optic ◽  
Fiber Optic Sensors ◽  
Polymer Matrix Composite ◽  
Test Protocol ◽  
Temperature Applications

AbstractAdvanced polymer matrix composite (PMC) materials have been more frequently employed for aerospace applications due to their light weight and high strength. Fiber-reinforced PMC materials are also being considered as potential candidates for elevated temperature applications such as supersonic vehicle airframes and propulsion system components. A new generation of high glass-transition temperature polymers has enabled this development to materialize. Clearly, there is a requirement to better understand the mechanical behaviour of this class of composite materials. In this study, polyimide-coated fiber optic sensors are employed to continuously monitor strain in a woven carbon fiber bismaleimide (BMI) matrix laminate subjected to tensile static and fatigue loading at elevated temperatures. A unique experimental test protocol is utilized to investigate the capability of the optical sensors to monitor strain and track stiffness degradation of the composite material. An advanced interrogation system and an optical spectrum analyzer are utilized to track the variation in the optical fiber wavelength and the wavelength spectrum for correlation with strain gage measurements. Isothermal tensile static and fatigue tests at room temperature, 105°C, 160°C and 205°C suggest that these optical sensors are capable of continuously monitoring strain and tracking the stiffness loss of a highly compliant PMC specimen during cyclic loading. The results illustrate that employing optical sensors for elevated temperature applications has significant advantages when compared to conventional strain gages.

Testing and Monitoring for a Large Scale Truss Bridge Using Long-Gauge Fiber Optic Sensors

2013 ◽  
Vol 569-570 ◽  
pp. 223-229 ◽  
Author(s):  
Chun Feng Wan ◽  
Wan Hong ◽  
Zhi Shen Wu ◽  
Tadanobu Sato
Keyword(s):  
Damage Detection ◽  
Structural Damage ◽  
Large Scale ◽  
Fiber Optic ◽  
Fiber Optic Sensors ◽  
Structural Testing ◽  
Bragg Grating ◽  
Truss Bridges ◽  
Long Span ◽  
Truss Bridge

Fiber optic sensors become very popular for structural testing and monitoring in civil engineering nowadays, due to its advantage of high resolution and environment durability. In this paper, long-gauge fiber optic bragg grating sensors will be introduced. Structural damage detection stratagem using the micro-strain mode will be studied. Then its application to a structural testing and monitoring for a real long span truss bridge will be discussed in detail. In the testing, 23 long-gauge fiber optic bragg grating sensors were deployed on the mid span of the bridge. Testing were made under conditions either there is train on the bridge or no train on it. Corresponding dynamic characteristics were analyzed and discussed. Results of the testing show that long-gauge fiber optic sensors can work well for structural testing and also damage detection for truss bridges.

Measurement of process-induced strains in composite materials using embedded fiber optic sensors

1996 ◽  
Author(s):  
Craig M. Lawrence ◽  
Drew V. Nelson ◽  
Jay R. Spingarn ◽  
Thomas E. Bennett
Keyword(s):  
Composite Materials ◽  
Fiber Optic ◽  
Fiber Optic Sensors

scholarly journals Impact Damage Detection of CFRP with Michelson Interferometric Fiber-Optic Sensors.

2000 ◽  
Vol 26 (4) ◽  
pp. 121-129 ◽  
Author(s):  
Hiroshi TSUDA ◽  
Shin-ichi TAKEDA ◽  
Kei URABE ◽  
Jun TAKAHASHI ◽  
Teruo KISHI
Keyword(s):  
Damage Detection ◽  
Fiber Optic ◽  
Impact Damage ◽  
Fiber Optic Sensors

scholarly journals Local and Global Approaches for Damage Detection in Composite Structures by Fiber Optic Sensors

2018 ◽  
Author(s):  
Alfredo Guemes ◽  
Antonio Fernandez- Lopez ◽  
Patricia F. Diaz-Maroto ◽  
Angel Lozano ◽  
Julián Sierra-Pérez
Keyword(s):  
Damage Detection ◽  
Composite Structures ◽  
Fiber Optic ◽  
A Priori ◽  
Fiber Optic Sensors ◽  
Network Density ◽  
Strain Measurements ◽  
Damage Location ◽  
Local Technique ◽  
External Loads

Fiber optic sensors cannot measure damage; for getting information about damage from strain measurements, additional strategies are needed, and several alternatives have been proposed. This paper discuss two independent concepts: the first one is based on detecting the new strains appearing around a damage spot; the structure does not need to be under loads; the technique is very robust, damage detectability is high, but it requires sensors to be located very close to the damage, so it is a local technique. The second approach offers a wider coverage of the structure, it is based on identifying the changes caused by the damage on the strains field in the whole structure for similar external loads. Damage location does not need to be known a priori, detectability is dependent upon the sensors network density, damage size and the external loads. Examples of application to real structures are given.

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