The invention belongs to the technical field of
threaded fastener testing, and relates to a method for measuring shaft force of a bolt. The method comprises the following steps: 1, a
calibration curve, for calibration, between the ultrasonic
signal propagation time increment and the shaft force of the bolt is calibrated through tool clamps; 2, ultrasonic
signal propagation time increment data of the actually assembled bolt are measured during actual assembling; and 3, the ultrasonic
signal propagation time increment data of the actually assembled bolt are compared with the
calibration curve toobtain the shaft force of the actually assembled bolt. According to the method, the situation that a connected piece is damaged, and thus waste is generated can be avoided, meanwhile, unification oftightening equipment during calibration and
assembly can be guaranteed, and the
system error is avoided so as to obtain more accurate
test data; in addition, bolts of different specifications and connection lengths can further be calibrated by adjusting combinations of the clamps, and the accurate
calibration curve is advantageously obtained to support the
product design; and the structure is simple, assembling is convenient, the interchangeability is good, and operation is easy and convenient.