Abstract
Damage of in-service composite structures is commonly caused by impact. In higher-energy impact events, the impact damage is clearly visible on the surface of the composite. However, this is not the case for low to medium energy impacts where extensive damage can manifest itself internally or on the back surface of the structure (e.g., blowout) with very little or no visible damage on the surface. This class of damage is called “barely-visible impact damage” (BVID). This work proposes and experimentally verifies a sensing skin for the detection, localization, and quantification of BVID in unidirectional and woven composite laminates. This highly scalable sensing skin is composed of a matrix of flexible large-area capacitive sensors that transduces a change in geometry of the composite (i.e. damage) into a measurable change in capacitance and is designed for the long-term health monitoring of in-service composite structures. In this work, an experimental testing campaign is undertaken to investigate the sensitivity of the sensing skin for the detection of BVID in carbon fiber-reinforced composites. Verification is performed using Quantitative Ultrasonic Image Correlation (QUIC) and results demonstrate that the sensing skin is capable of detecting, localizing, and quantifying damage once a minimum damage size is achieved.
How to Cite:
Downey, A. ., Rad, C. V., Vereen, A. ., Mir, F. ., Sockalingam, S. . & Banerjee, S. ., (2019) “Sensing skin for in-service monitoring of woven composite laminates subjected to impact damage”, Review of Progress in Quantitative Nondestructive Evaluation .
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