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Jang, Sei-Hum
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Topics
Publications (10/10 displayed)
- 2019NDE THERMAL MAPPING USING THERMOCHROMIC SENSOR FILMS
- 2018Thermochromic Polymer Film Sensors for Detection of Incipient Thermal Damage in Carbon Fiber–Epoxy Compositescitations
- 2017Detection of incipient thermal damage in carbon fiber-epoxy composites using fluorescent thermal sensor films
- 2016Time temperature indicator film for monitoring composite repair adhesive cure using thermochromic fluorescent molecules
- 2014Time-temperature indicator for evaluating incipient thermal damage of CFRP
- 2014Damage detection for aerospace composites using matrix resins functionalized with fluorescent probe molecules
- 2013Influence of matrix resin mechanical properties on mechanochromic fluorescent damage probe response
- 2013Thermal damage detection of CFRP using coatings doped with fluorescent probes
- 2005Exceptional electro-optic properties through molecular design and controlled self-assemblycitations
- 2005Acentric lattice electro-optic materials by rational designcitations
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document
Detection of incipient thermal damage in carbon fiber-epoxy composites using fluorescent thermal sensor films
Abstract
Carbon fiber epoxy composites have become prevalent in a variety of industries, especially in aerospace. The significant non-destructive evaluation challenges of composites require new solutions, especially in detecting the onset of thermal damage (incipient thermal damage). The initial stages of thermal damage are chemical rather than physical, and can cause significant reduction in properties such as interlaminar shear strength (ILSS) well before physical damage becomes detectable in ultrasonic testing. This work demonstrates the use of thermochromic fluorescent molecules dispersed in films as sensors for such detection. A molecule has been developed which transitions from a colorless, non-fluorescent state to a colorful, highly fluorescent state when exposed to temperature-time combinations that can cause damage in composites. This molecule is dispersed in a removable polymer film and attached to composite parts to form a sensor. This work presents an evaluation of the sensor film's performance in comparison to ultrasonic C-scan as a method to detect incipient thermal damage. Carbon fiber-epoxy samples exposed to varying thermal exposures are evaluated using the fluorescent thermal sensor films and with ultrasonic imaging, and the results are compared to the results of short beam shear tests for ILSS.