In situ failure identification in woven composites throughout impact using fiber Bragg grating sensors

James Pearson; Mohanraj Prabhugoud; Mohammed Zikry; Kara Peters

doi:10.1117/12.657989

11 April 2006 In situ failure identification in woven composites throughout impact using fiber Bragg grating sensors

James Pearson, Mohanraj Prabhugoud, Mohammed Zikry, Kara Peters

Proceedings Volume 6174, Smart Structures and Materials 2006: Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems; 61742V (2006) https://doi.org/10.1117/12.657989
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2006, San Diego, California, United States

Abstract

In this study, measurements from low-impact velocity experiments 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 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 the 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 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. Thus, potential sources of error such as sensor debonding were eliminated from the strain data throughout the measurements. A comparison by number of impact strikes and dissipated energies corresponding to material perforation indicates that these measurements can provide accurate failure strains.

Citation Download Citation

James Pearson, Mohanraj Prabhugoud, Mohammed Zikry, and Kara Peters "In situ failure identification in woven composites throughout impact using fiber Bragg grating sensors", Proc. SPIE 6174, Smart Structures and Materials 2006: Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems, 61742V (11 April 2006); https://doi.org/10.1117/12.657989

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