Exact solution of stress and displacement of rotating elastic interference fit for a quill shaft of micro gas turbine

Interference fit is widely uesd in micro gas turbine to transfer large torque and offer significant cost advantages. In this paper, a interference fit model was developed to research the contection characteristics of quill shaft for micro gas turbine. The radial stress, tangential stress, radial displacement and the Von Mises stress of the quill shaft are derived by using elastic theory to analyze the influence of the contact surface pressure and angular velocity on the strength of the quill shaft. Numerical calculated results show that The radial stress of the quill shaft is identically greater than zero and positively correlated with the contact press and angular velocity. The direction of the tangential stress of the quill shaft is determined by the value of the contact pressure. The radial displacement of the quill shaft is a monotony decrease function of the contact pressure and a monotony increase function of the angular velocity. Generally, the maximum stress of the quill shaft happens in the inner surface of the quill shaft regardless of the angular velocity.