Acousto-Elastic Fastener Preload Indicator

摘要

This report describes the assembly, calibration, and testing of an acousto-elastic fastener preload indicator that has been demonstrated to preload fasteners with better than 5% accuracy within the elastic range. The system is computer automated and includes a calibration procedure for checking cutoff accuracy. The new capability afforded by this computer-controlled acousto-elastic torque wrench improves state-of-the-art capabilities by nearly an order of magnitude in accuracy for setting preloads and can be used on flaw-free fasteners of the flat-head type. (Author)