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Fiber Optic Shape-Sensing for Woven Materials

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Fiber Optic Shape-Sensing for Woven Materials

 

This research presents a sensing technique that uses fiber Bragg gratings (FBGs) to measure the out-of-plane deformation of woven composites during quasi-static impact events. Measuring the transient deformation is important to understanding how these materials absorb energy during impacts. Currently, the primary measurement technique is to record the final deformation of a clay backing material after the impact. However, this method precludes important dynamic measurements during the impact event. We integrated FBGs into a woven Kevlar fabric, circularly clamped the fabric, and then applied an increasing load to the middle of the sheet. We used the FBGs as distributed strain sensors to measure in-plane strains as the fabric was deformed out-of-plane. By running these calculated strains through a mathematical algorithm we were then able to reconstruct the out-of-plane deformation of the Kevlar during the impact. We compared the out-of-plane deformation calculated from the FBGs to the deformation independently calculated from a stereo camera setup and digital image correlation. This new FBG sensing technique of reconstructing deformations in composites could eventually lead to more accurate testing techniques for applications in a variety of fields from aerospace to body armor.

 

Author: Jack Kawell

 

Conference: SAMPE Seattle 2017

 

SKU/Code: SE17--0588

Pages: 11



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