Damage detection in composites using optical fibre sensors

Takeda, Nobuo; Okabe, Yoji; Mizutani, Tetsuya

doi:10.1243/09544100jaero148

Cited by 44 publications

(39 citation statements)

References 65 publications

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“…Unidirectional glass fibres with a density of 1200 g/cm 3 were used for composite production, as the effect of FBG embedment in the composite is assumed to be negligible in higher density of reinforcement fibres. The composite was produced using the cold infusion method, with vacuum bagging technique.…”

Section: Composite Productionmentioning

confidence: 99%

Classification of composite damage from FBG load monitoring signals

et al. 2017

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This paper describes a new method for the classification and identification of two major types of defects in composites, namely delamination and matrix cracks, by classification of the spectral features of fibre Bragg grating (FBG) signals. In aeronautical applications of composites, after a damage is detected, it is very useful to know the type of damage prior to determining the treatment method of the area or perhaps replacing the part. This was achieved by embedding FBG sensors inside a glass-fibre composite, and analysing the output signal from the sensors. The glass-fibre coupons were subjected to mode-I loading under tension-compression and static tests, in order to induce matrix cracks and delamination damages respectively. Afterwards, using wavelet features extracted from spectral measurements of the FBG sensors, classification of the damage type was carried out by means of support vector machines as a general classification tool with a quadratic kernel.

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Section: Composite Productionmentioning

confidence: 99%

Classification of composite damage from FBG load monitoring signals

et al. 2017

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“…Reference [6] found that the FBG spectrum was sensitive to the delamination propagation behavior of composite materials. The spectrum was split into two peaks dependent on the strain gradient which was caused by edge delamination.…”

Section: Introductionmentioning

confidence: 99%

Mechanism of Subordinate Peak Skewing of FBG Sensor during Cracks Propagation Monitoring on Aluminum Alloy Structure

et al. 2017

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This study investigates the variety of the spectra features of fiber Bragg grating (FBG) around the crack tip during fatigue crack propagation. The study results reveal that the turning of the subordinate peak is significantly associated with crack lengths and corresponds to strain gradient along the FBG. Meanwhile, the strain distribution sensed by the FBG changes with the sensing section of the grating. FBG sensors could observe the monotonic plastic zone ahead of the fatigue crack tip. The cubic strain is distributed along the grating, with monotonic plastic zone propagation at the initial and terminal part of the grating, at approximately a 30% ratio of the entire grating. However, the monotonic plastic zone is sensed by the FBG, at ±15% bias of the grating center, with the quadratic strain gradient pattern along the grating. In particular, when the initial and terminal parts of the grating experience highly inhomogeneous strain distribution, the spectrum distortion occurs.

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“…Our previous paper, published in 2007 [5], presented the development of small-diameter optical fibers and their fiber Bragg grating (FBG) sensors. The paper showed several techniques for detecting composite damage and gave a summary of the Japanese national project on optical-fiber-based SHM for feasible applications in aerospace composite structures.…”

Section: Introductionmentioning

confidence: 99%

Recent advancement in optical fiber sensing for aerospace composite structures

Minakuchi

Takeda

2013

Photonic Sens

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Optical fiber sensors have attracted considerable attention in health monitoring of aerospace composite structures. This paper briefly reviews our recent advancement mainly in Brillouin-based distributed sensing. Damage detection, life cycle monitoring and shape reconstruction systems applicable to large-scale composite structures are presented, and new technical concepts, "smart crack arrester" and "hierarchical sensing system", are described as well, highlighting the great potential of optical fiber sensors for the structural health monitoring (SHM) field.

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Damage detection in composites using optical fibre sensors

Cited by 44 publications

References 65 publications

Classification of composite damage from FBG load monitoring signals

Classification of composite damage from FBG load monitoring signals

Mechanism of Subordinate Peak Skewing of FBG Sensor during Cracks Propagation Monitoring on Aluminum Alloy Structure

Recent advancement in optical fiber sensing for aerospace composite structures

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