Abstract
Interference fit joints have been widely used in many engineering constructions, in particular in electric motors. It is of particular importance to calculate the load capacity of press-fit joints, especially in the overload ranges of construction to estimate the safety factor. The article presents a FEM numerical simulation of pressing the shaft into the hub, taking into account various types of fits. The results of numerical simulations presented in the article were positively verified with the MTS measuring device, which confirmed the correctness of the numerical model. So far, the load-bearing capacity of press-fit joints has been calculated from Lame’s formulas. The results of the load capacity of the joints obtained by the FEM simulation were compared with the results obtained from Lame’s formula. The comparison shows that when designing interference fit joints, attention should be paid to the fact that the press-in process, depending on the type of fit, may be elastic-plastic. Plastic deformations in the contact zone of the joint affect its load-bearing capacity. Therefore, the design of press-fit joints should not be based on Lame’s formulas, which do not take into account the range of plastic work of the material.
Highlights
Analysis of Interference-Fit Joints.Interference-fit joints are commonly used in engineering constructions for connecting the shaft and the hub [1]
The comparison shows that when designing interference fit joints, attention should be paid to the fact that the press-in process, depending on the type of fit, may be elastic-plastic
Numerical simulations and experimental tests lead to the following conclusions: 1
Summary
Calculating the capacity press-fit joints using formulas based on the assumpμ—coefficient of load friction of theof joined parts contact surfaces, tionsd—nominal of the linear theory of elasticity is possible only on the condition that the surface shaft diameter, pressure value is lower than the yield point. Calculating the load capacity of a press-fit joint from the formulas assumptions of the linear theory of elasticity is possible assuming that the value of the surface pressure is lower than the yield point. Simulation results and the correctness of the numerical model have been experimentally verified for the selected type of fit They showed that plastic deformations occur in press-fit joints and the joint breaking forces differ significantly from those calculated based on Formulas (1) and (4)
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