Torque capacity and contact stress analysis of conical interference fit shrink disc of wind turbine

Abstract

Purpose Shrink fit is an important method used in mechanical transmission, but the design of these connections is not sufficiently precise due to lack of knowledge regarding the effects of many parameters. The paper aims to discuss these issues. Design/methodology/approach This paper presents the torque capacity and contact stress analysis for a new shrink disc by numerical analysis and experimental methods. Torque capacity analysis aims to predict the effectiveness of mechanical transmission, and to check the structural safety. Stress-strain curves are measured using the universal testing machine, and Bilinear Kinematic Hardening rate-independent plasticity model characterises the elastic-plastic response of the materials. Findings The numerical result shows that there is no plastic deformation at the interference regions, and the maximum equivalent strain happens on the inner ring. The stress of outer ring is decreased with radius increasing, and shows a periodic variation along the circumference, but stress concentration happens at the threaded holes. Finally, the torque capacity of the shrink disc system is measured through a developed test machine, and the torque capacity difference between numerical and experimental results is about 3.3 per cent. Originality/value This paper presents a numerical and experimental carrying capacity analysis for a shrink disc. Plasticity model characterises the materials’ elastic-plastic response based testing. A test machine is designed to measure the torque capacity; the error is about 3.3 per cent.