Stress analysis of shrink fitting process of ultra-thin reactor coolant pump rotor-can

This paper aims to accurately predict the stress evolution and stress distribution during shrink fitting process. The hoop stress on rotor-can after shrink fitting process was calculated using Lame's equation. Then finite element (FE) method was used to calculate the stress evolution on rotor-can during shrink fitting process. The effects of manufacture defects on stress distribution on rotor-can after shrink fitting process was analyzed. Finally, a shrink fitting experiment was carried out, and the residual stress on rotor-can after shrink fitting was measured by hole-drilling strain-gauge method. The results show that during shrink fitting process, thermal stress would occur on rotor-can along axial direction and hoop direction. After shrink fitting process, the fitting stress was along hoop direction. When there were ring-shaped defects on rotor-can, there would be axial stress in the defective area. The theoretical calculation results, simulation results and experimental results are in good agreement with each other. (c) 2021 Elsevier Ltd. All rights reserved.