Fatigue Life Prediction of a New Loader Working Device

doi:10.3901/JME.2025.17.027

Abstract

Abstract: In order to verify the reliability of the loader working device, the static analysis of the new working device was carried out for a new type of working device with eight connecting rods reversed by the loader, and the force of each hinge point in the working device was obtained. The boom, rocker arm, ejector rod and connecting rod of the new working device were flexibly processed by Workbench software, and the rigid-flexible coupling model of the loader working device was established in ADAMS software, and the force at the hinge point of the boom under various working conditions was obtained, and the correctness of the rigid-flexible coupling dynamic simulation of the new loader was verified by comparing it with the static analysis results. The stress-time history of the dangerous nodes of each component in the loader working device is obtained. The stress spectrum of the dangerous nodes of the loader was obtained using the rainflow counting method, and the GoodMan linear equation was used to correct the asymmetric cyclic stress. Finally, the fatigue life is calculated by the modified P-S-N curve. The results show that the new loader working device meets the design requirements and lays a foundation for the lightweight research of the working device.

Key words: new loader working device, dynamic simulation, rigid-flexible coupling model, rainflow counting, GoodMan linear equations

CLC Number:

TH243

HUANG Peng, LU Jingshen, DING Huafeng, CHEN Ziming, ZHAO Yuqian. Fatigue Life Prediction of a New Loader Working Device[J]. Journal of Mechanical Engineering, 2025, 61(17): 27-40.

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