In this study, measurements from low-impact velocity experiments including embedded and surface mounted optical fiber Bragg grating (FBG) sensors were used to obtain detailed information pertaining to damage progression in two-dimensional laminate woven composites. The woven composites were subjected to multiple strikes at 2m/s until perforation occurred, and the impactor position and acceleration were monitored throughout each event. From these measurements, we obtained dissipated energies and contact forces. The FBG sensors were embedded and surface mounted at different critical locations near penetration-induced damaged regions. These FBG sensors were used to obtain initial residual strains and axial and transverse strains that correspond to matrix cracking and delamination. The transmission and reflection spectra were continuously monitored throughout the loading cycles. They were used, in combination with the peak contact forces, to delineate repeatable sensor responses corresponding to material failure. From the FBG spectra, fiber and matrix damage were separated by an analysis based on signal intensity, the presence of cladding modes, and the behavior of individual Bragg peaks as a function of evolving and repeated impact loads. This provided an independent feedback on the integrity of the Bragg gratings. A comparison by number of impact strikes and dissipated energies corresponding to material perforation indicates that embedding these sensors did not affect the integrity of the woven systems and that these measurements can provide accurate failure strains.
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ASME 2005 International Mechanical Engineering Congress and Exposition
November 5–11, 2005
Orlando, Florida, USA
Conference Sponsors:
- Materials Division
ISBN:
0-7918-4234-7
PROCEEDINGS PAPER
Damage Progression Identification in Woven Composites With Fiber Bragg Grating Sensors
James Pearson,
James Pearson
North Carolina State University
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Mohanraj Prabhugoud,
Mohanraj Prabhugoud
North Carolina State University
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Mohammed Zikry,
Mohammed Zikry
North Carolina State University
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Kara Peters
Kara Peters
North Carolina State University
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James Pearson
North Carolina State University
Mohanraj Prabhugoud
North Carolina State University
Mohammed Zikry
North Carolina State University
Kara Peters
North Carolina State University
Paper No:
IMECE2005-80487, pp. 49-57; 9 pages
Published Online:
February 5, 2008
Citation
Pearson, J, Prabhugoud, M, Zikry, M, & Peters, K. "Damage Progression Identification in Woven Composites With Fiber Bragg Grating Sensors." Proceedings of the ASME 2005 International Mechanical Engineering Congress and Exposition. Materials. Orlando, Florida, USA. November 5–11, 2005. pp. 49-57. ASME. https://doi.org/10.1115/IMECE2005-80487
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