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A new dynamic model for bolted joints in heavy machine structures is proposed. The influence of the bolt pretightening force, the interface dimensions and the surface roughness on joint dynamics (i.e. the stiffness matrix of finite element) were analysed. Each stiffness coefficient in the matrix can be expressed by an exponential function of preload, and a quadratic polynomial function of geometric dimensions. Sixteen specimens were thoroughly designed and analysed. Then, the resultingdoi:10.20855/ijav.2014.19.1339 fatcat:carna2yj6bdnnedfmv2h7brxae