A Method for Calculation of Fastener Torque Specifications Which Includes Statistical Tolerancing

Abstract

The Monte Carlo simulation method is applied to quantify the probability of exceeding the maximum desired bolt exploitation for fasteners tightened to a torque specification. The simulation results are utilized to develop a method for the calculation of torque specifications such that the probability that a bolt will exceed the maximum desired bolt exploitation is thirty-two parts per million (ppm).

Statistical Consideration of Uncertainties in Bolted Joints of the Drive Train of Sheet-Fed Offset Printing Presses

“…Uncertainties in these input factors will result in uncertain output results. Reiff shows a method of calculating fastener torque including statistical tolerancing [8]. The focus is on setting a tightening torque which does not result in loading a bolt beyond its yield strength.…”

“…The statistical approach used in this paper is similar to the method described in [8], but the focus is not on the screw connection but rather on the load carrying capacity of the connection perpendicular to the screw axis (corresponding to the y-z-plane in Fig. 4).…”