Real-time and visible monitoring of structural damage using mechanoresponsive luminogen: recent progress and perspectives

Organic mechanochromic luminescence‐based visualization of fatigue damage and life prediction of aluminum to steel resistance spot welds

“…Based on the location of luminescence emission, the crack length can be determined thus the fracture toughness can be calculated. However, due to instantaneous luminescence response, it is inconvenient to detect and transmit the ML signals 30,31 . Moreover, ML materials usually have poor film‐forming capability, which are often mixed with epoxy resin and coated on the surface of structures.…”

“…However, due to instantaneous luminescence response, it is inconvenient to detect and transmit the ML signals. 30,31 Moreover, ML materials usually have poor film-forming capability, which are often mixed with epoxy resin and coated on the surface of structures. Interface debonding between resin and structures is easy to occur under fatigue loading, restricting the application of ML-based detection method for fatigue damage.…”

Visualization and Depth Estimation of Inner Crack in High‐Pressure Equipment Based on Organic Mechanochromic Luminescent Materials

“…Therefore, the ML-based on-site detection system needs high-speed camera to receive ML signal, which brings inconvenience to ML signal acquisition and transmission. [20,21] Compared with ML response, the duration of MCL response can last longer, which is convenient to receive and transmit the luminance. Currently, most research are focused on synthesis and luminescence mechanisms of MCL materials (i.e., polymers, photonic crystals, and molecules), less attention has been paid to detect the structural damage.…”

“…Therefore, the ML‐based on‐site detection system needs high‐speed camera to receive ML signal, which brings inconvenience to ML signal acquisition and transmission. [ 20,21 ]…”

Principles, properties, and sensing applications of mechanoluminescence materials

“…6 Compared with other materials, the ML materials with the characteristics of fast response speed, visualization and high repeatability have been widely used in the fields of stress sensing, structural health monitoring and luminescence anti-counterfeiting. [7][8][9][10][11][12] Therefore, it is important to review the principles, performance improvement and application development of ML materials, as shown in Fig. 1.…”