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Item type:Publication, Access status: with files , Fully-integrated carbon nanotube epoxy film sensors for strain sensing in GFRP(Composite Construction Laboratory, 2022-06); ; ; Structural health monitoring of fiber-reinforced polymer composites becomes more important to ensure a safe and reliable operation. This work demonstrates a method for local matrix modification of glass fiber-reinforced polymers with fully-integrated pre-cured carbon nanotube epoxy thin-film sensors enabling a piezo-resistive strain and damage monitoring. The film sensors were manufactured using a manual film applicator, partially pre-cured for 48 h under lab conditions, cut to shape, and placed on dry glass fiber fabrics before infusion in a resin transfer molding process. Three-point bending tests with sensor films under the upper ply, in the middle, and over the lower ply prove the sensor films' ability for localized strain monitoring. Furthermore, detection of critical buckling is possible in structural parts, as demonstrated in compression tests of coupon specimens and stringer components.Publicationtype: Conference Paper95 216 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: with files , Strain sensing in GFRP via fully integrated carbon nanotube epoxy film sensors(Elsevier, 2021-10); ; ; ; Structural health monitoring of composite structures enables early damage detection to prevent critical component failure. Surface-mounted strain gauges are commonly applied to monitor the integrity of composite structures in highly loaded areas. However, strain gauges can only measure strain on the structure's surface and are exposed to environmental influences. Within this paper, fully integrated carbon nanotube thin-film sensors for strain and damage sensing in glass fibre reinforced polymers (GFRP) via electrical resistance measurements are presented. Single wall carbon nanotube epoxy thin-films were manufactured using a manual film applicator, partially pre-cured, placed on dry glass fabrics and infused in a resin transfer moulding process. The mechanical properties of the composites and strain sensing capabilities of the integrated sensors were studied for various load cases and different laminate lay-ups. Results of quasi-static and step-wise three-point bending and tensile tests show that the integrated films allow for localised strain measurements in GFRP without significant loss of mechanical properties. Open hole tensile tests proof the ability to monitor local strain and damage in highly loaded areas enabling failure prediction via threshold resistance change values. The proposed thin-films enable a tailored strain and damage monitoring of GFRP offering the possibility for measurements at different material depths, over large sections or selectively in highly loaded areas. The manufacturing process is easily automatable and suitable for large scale manufacturing.Publicationtype: Journal ArticleScopus© Citations 7 85 279