What parameters are critical for structural health monitoring using TENG-powered sensors?

Critical parameters for structural health monitoring (SHM) using TENG-powered sensors include strain, vibration, temperature, and the presence of cracks or corrosion. Strain sensors measure the deformation of structural components under load, providing information about stress distribution and potential areas of weakness. Vibration sensors detect changes in the vibrational behavior of the structure, which can indicate damage or degradation. Temperature sensors monitor temperature variations, which can affect the structural integrity of materials and indicate potential thermal stress. Crack and corrosion sensors detect the formation and propagation of cracks or the presence of corrosion, which are common causes of structural failure. These sensors need to be sensitive, reliable, and able to operate continuously with the energy harvested by the TENG. For example, a TENG-powered strain sensor attached to a bridge support can measure the strain caused by passing vehicles. A significant increase in strain beyond a predetermined threshold could indicate a structural problem. Similarly, a TENG-powered corrosion sensor could detect the electrochemical changes associated with corrosion in steel reinforcement bars within concrete structures.