Identification of bolted joints under repeatable loads

Abstract

With the advent of delicate and high speed structures like aircraft and rotating machines, researchers have been discovering the importance of joint effects on the structural dynamic response. Joints and fasteners often have a significant effect on the dynamic behavior of assembled mechanical structures and the analytical prediction of structural responses. Previous researchers on bolted joints did not count on the repeatability of the measured data under the same load. In this paper the bolted joint is modeled using Iwan model. On the other hand the bolted joint is tested experimentally under repeatable loading – unloading conditions with and without gasket. The differences in the results are examined in the numerical model of joint. The variations in the parameters of model are investigated to obtain a consistent model of joint under repeatable loads. The modified Iwan model shows more accuracy due to considering the effects of the loading conditions of joint.