Abstract:  In order to ensure the safety of tower crane construction and prolong the service life of tower crane, the fatigue life of tower crane was evaluated. Firstly, taking a certain type of tower crane as the research object, SolidWorks was used to conduct three-dimensional modeling, the typical working conditions of the tower crane were analyzed. The Workbench was used to determine the maximum stress position of the tower cranes static analysis results. Then ANSYS APDL was combined with ADAMS to conduct rigidflexible coupling dynamics simulation, and the load spectrum of the working cycle under the working conditions was obtained. Finally, the fatigue five-block diagram of NCODE Design Life was used to analyze the fatigue of tower crane under this working condition. The results show that the most frequent fatigue failure location is near the connecting position between the upper chord of the sixth crane and the outer connecting rod, and the maximum damage of each cycle of the tower crane lifting arm is 3.598×10-6 and the minimum number of cycles is 2.799×105 under this working condition, which meets the design requirements of the tower crane. It provides reference value for fatigue life evaluation and design of tower crane in service, and can be used as the basis for maintenance and replacement of tower crane parts.

Key words:  rigid flexible coupling; fatigue life; tower crane; S/N curve; dynamics analysis

LU Ning, HAN Chong-rui. Fatigue life analysis of tower crane boom based on ADAMS rigid flexible coupling model［J］.Journal of Mechanical & Electrical Engineering, 2021,38(8):1003-1009.