2023 年 68 巻 10 号 p. 680-687
The identification and evaluation of tribological phenomena involving electrical contact is important for maintaining the performance and extending the lifetime of machine elements that are in contact and friction while electric current is applied to them. Acoustic emission (AE) is a phenomenon in which deformation or fracture of a material releases previously stored strain energy, which propagates inside the material as elastic stress waves (AE waves). AE waves are also generated at a frictional interface in a series of processes from contact with surface asperities to deformation and fracture. AE sensing allows AE waves to be measured as AE signals and analyzed to identify and evaluate various phenomena at the frictional interface. This article provides a wide commentary on the utilization of AE sensing for the identification and evaluation of tribological phenomena involving electrical contact, from the main points to application cases.
