Abstract The conventional engineering design of threaded fasteners applies a linear model determining axial force from fastening torque and was found to be applicable only for vanishing inelastic deformations. Applications… Click to show full abstract
Abstract The conventional engineering design of threaded fasteners applies a linear model determining axial force from fastening torque and was found to be applicable only for vanishing inelastic deformations. Applications of the linear formula can result in a significant over-estimate of the axial force. Detailed experiments reveal that plasticity and wear damage in contact surfaces change frictional behavior and cause an over-proportional increment in tightening torque. A modified friction model was proposed based on the frictional dissipation energy and verified experimentally and computationally. The corresponding force-torque model shows good consistency with experiments and can be applied to predict plastic fastening processes.
               
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