Fatigue Design of Welded Structure Based on the Non-linear Cumulative Damage Theory

doi:10.3901/JME.2019.06.032

Abstract

Abstract: A welding fatigue design model is constructed based on nonlinear damage theory, which can be effectively used for fatigue design and analysis of welded joints under multi-level fatigue load. The fatigue design model considers the load sequence effect and the influence of load interaction. The Manson-Halford cumulative damage model and its improved model are used to deal with the load sequence effect. The interaction between the loads is reflected in the form of stress ration. For the fatigue design of standard welded joints, influences of stress factor caused by different loading sequences and the level of load are discussed. Numerical examples are provided to test the performance of the proposed method, by comparing with the design results based on the traditional Miner theory, and satisfactory results are achieved with higher precision and reliability. The design model can better deal with the load sequence effect and the load interaction with less model parameters, and can be applied in engineering.

Key words: fatigue design, load sequence effect, Manson-Halford model, stress factor

CLC Number:

TG405

XUE Qiwen, DU Xiuyun. Fatigue Design of Welded Structure Based on the Non-linear Cumulative Damage Theory[J]. Journal of Mechanical Engineering, 2019, 55(6): 32-38.

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