Mechanoluminescent Composites Towards Autonomous Impact Damage Detection of Aerospace Structures

Roadmap on measurement technologies for next generation structural health monitoring systems

“…It was shown that the two different conjugated polymers, which respond to different wavelengths of light, were assembled to exhibit pH and strain sensing capabilities with infra-red light above 800 nm range and blue range light in 410-490 nm, respectively [217]. On the other hand, research has been conducted to use light as a sensor signal for sensing materials' response to external physical stimulus [218,[220][221][222][223]. Since late 1990's, mechanoluminescence (ML) has drawn researchers' attention to use ML for devising ML-based physical sensors as an energy efficient passive sensor, intuitive measurement of physical behavior, and a sensing method potentially suitable for visionbased SHM.…”

Fracto-mechanoluminescent light emission of EuD4TEA-PDMS composites subjected to high strain-rate compressive loading

“…ML materials have intrigued many researchers due to their unique transformative properties that can be possibly harnessed for developing a new class of sensor technologies [12][13][14][15][16][17][18][19][20]. ML materials have been integrated with fiber optics sensors to detect cracks in cementitious composites [20].…”

“…ML materials were theoretically studied to understand the relationship between ML light emissions and impact energy [15]. In addition, empirical studies were conducted to investigate effect of impact energy on ML light emission and decay rates [16]. Nevertheless, light emission profiles of the ML materials are not well understood, especially under high strain-rate compressive loading, which can result from impact events occurring on aerospace structures.…”