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

Y. Okabe, T. Mizutani, Shigeki Yashiro, N. Takeda

Research output: Contribution to journalConference article

11 Citations (Scopus)

Abstract

Small-diameter fiber Bragg grating (FBG) sensors have been developed by Hitachi Cable Ltd. and the authors. Since the outside diameter of polyimide coating is 52 μm, embedding of the sensors into carbon fiber reinforced plastic (CFRP) composite prepregs of 125 μm in thickness does not deteriorate the mechanical properties of the composite laminates. In this research, the small-diameter FBG sensor was applied for the detection of transverse cracks in CFRP composites. The FBG sensor was embedded in 0° ply of a CFRP cross-ply laminate. The reflection spectra from the FBG sensor were measured at various tensile stresses. As a result, the reflection spectrum became broad and had some peaks with an increase of the transverse crack density in the 90° ply. In order to confirm that the change in the spectrum was caused by transverse cracks, the spectra were calculated theoretically. The calculated result reproduced the change in the measured spectrum very well. These results show that the small-diameter FBG sensors have a potential to detect the occurrence of transverse cracks through the change in the form of the reflection spectrum, and to evaluate the transverse crack density quantitatively by the spectrum width.

Original languageEnglish
Pages (from-to)295-305
Number of pages11
JournalProceedings of SPIE - The International Society for Optical Engineering
Volume4328
DOIs
Publication statusPublished - Jan 1 2001
Externally publishedYes
EventSmart Structures and Materials 2001- Sensory Phenomena and Measurement Instrumentation for Smart Structures and Materials - Newport Beach, CA, United States
Duration: Mar 5 2001Mar 6 2001

Fingerprint

Fiber Bragg Grating Sensor
Fiber Bragg gratings
Bragg gratings
Damage
Composite
damage
composite materials
fibers
Crack
Transverse
Cracks
sensors
Carbon fiber reinforced plastics
cracks
Sensors
Composite materials
carbon fiber reinforced plastics
Carbon Fiber
Plastics
Laminates

All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering
  • Condensed Matter Physics

Cite this

Application of small-diameter FBG sensors for detection of damages in composites. / Okabe, Y.; Mizutani, T.; Yashiro, Shigeki; Takeda, N.

In: Proceedings of SPIE - The International Society for Optical Engineering, Vol. 4328, 01.01.2001, p. 295-305.

Research output: Contribution to journalConference article

@article{77a4a0ef6fbb43b19a22b0c803e07cda,
title = "Application of small-diameter FBG sensors for detection of damages in composites",
abstract = "Small-diameter fiber Bragg grating (FBG) sensors have been developed by Hitachi Cable Ltd. and the authors. Since the outside diameter of polyimide coating is 52 μm, embedding of the sensors into carbon fiber reinforced plastic (CFRP) composite prepregs of 125 μm in thickness does not deteriorate the mechanical properties of the composite laminates. In this research, the small-diameter FBG sensor was applied for the detection of transverse cracks in CFRP composites. The FBG sensor was embedded in 0° ply of a CFRP cross-ply laminate. The reflection spectra from the FBG sensor were measured at various tensile stresses. As a result, the reflection spectrum became broad and had some peaks with an increase of the transverse crack density in the 90° ply. In order to confirm that the change in the spectrum was caused by transverse cracks, the spectra were calculated theoretically. The calculated result reproduced the change in the measured spectrum very well. These results show that the small-diameter FBG sensors have a potential to detect the occurrence of transverse cracks through the change in the form of the reflection spectrum, and to evaluate the transverse crack density quantitatively by the spectrum width.",
author = "Y. Okabe and T. Mizutani and Shigeki Yashiro and N. Takeda",
year = "2001",
month = "1",
day = "1",
doi = "10.1117/12.435532",
language = "English",
volume = "4328",
pages = "295--305",
journal = "Proceedings of SPIE - The International Society for Optical Engineering",
issn = "0277-786X",
publisher = "SPIE",

}

TY - JOUR

T1 - Application of small-diameter FBG sensors for detection of damages in composites

AU - Okabe, Y.

AU - Mizutani, T.

AU - Yashiro, Shigeki

AU - Takeda, N.

PY - 2001/1/1

Y1 - 2001/1/1

N2 - Small-diameter fiber Bragg grating (FBG) sensors have been developed by Hitachi Cable Ltd. and the authors. Since the outside diameter of polyimide coating is 52 μm, embedding of the sensors into carbon fiber reinforced plastic (CFRP) composite prepregs of 125 μm in thickness does not deteriorate the mechanical properties of the composite laminates. In this research, the small-diameter FBG sensor was applied for the detection of transverse cracks in CFRP composites. The FBG sensor was embedded in 0° ply of a CFRP cross-ply laminate. The reflection spectra from the FBG sensor were measured at various tensile stresses. As a result, the reflection spectrum became broad and had some peaks with an increase of the transverse crack density in the 90° ply. In order to confirm that the change in the spectrum was caused by transverse cracks, the spectra were calculated theoretically. The calculated result reproduced the change in the measured spectrum very well. These results show that the small-diameter FBG sensors have a potential to detect the occurrence of transverse cracks through the change in the form of the reflection spectrum, and to evaluate the transverse crack density quantitatively by the spectrum width.

AB - Small-diameter fiber Bragg grating (FBG) sensors have been developed by Hitachi Cable Ltd. and the authors. Since the outside diameter of polyimide coating is 52 μm, embedding of the sensors into carbon fiber reinforced plastic (CFRP) composite prepregs of 125 μm in thickness does not deteriorate the mechanical properties of the composite laminates. In this research, the small-diameter FBG sensor was applied for the detection of transverse cracks in CFRP composites. The FBG sensor was embedded in 0° ply of a CFRP cross-ply laminate. The reflection spectra from the FBG sensor were measured at various tensile stresses. As a result, the reflection spectrum became broad and had some peaks with an increase of the transverse crack density in the 90° ply. In order to confirm that the change in the spectrum was caused by transverse cracks, the spectra were calculated theoretically. The calculated result reproduced the change in the measured spectrum very well. These results show that the small-diameter FBG sensors have a potential to detect the occurrence of transverse cracks through the change in the form of the reflection spectrum, and to evaluate the transverse crack density quantitatively by the spectrum width.

UR - http://www.scopus.com/inward/record.url?scp=0034769556&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0034769556&partnerID=8YFLogxK

U2 - 10.1117/12.435532

DO - 10.1117/12.435532

M3 - Conference article

AN - SCOPUS:0034769556

VL - 4328

SP - 295

EP - 305

JO - Proceedings of SPIE - The International Society for Optical Engineering

JF - Proceedings of SPIE - The International Society for Optical Engineering

SN - 0277-786X

ER -