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Abstract
In this paper, a fatigue strength analysis approach based on Goodman-Smith fatigue limit diagram （GSFLD） and reliability theory is proposed to solve the problem that the traditional fatigue strength analysis of bogie frame is too conservative, considering the parameter uncertainty in engineering practice. Firstly, according to UIC615-4, EN13749 standard and GSFLD, the fatigue strength of the frame is calculated. The experimental results are compared with the simulation data to determine the location of the higher fatigue strength as the control point for the strength evaluation. Secondly, the parametric model of the frame is established by APDL language, and the D-optimal experiment design of uncertainty parameters is carried out. The polynomial response surface function with the mean stress and stress amplitude of the control point as the objective is established. The control points under the influence of uncertainty parameters are obtained by importance sampling method. Finally, the functional expression of GSFLD without considering the safety factor is derived, and the fatigue strength reliability of control point is calculated. The results of this study not only reveal the influence of parameter uncertainty on fatigue strength, but also demonstrate a need of developing new evaluation methods to accommodate fatigue analysis.
Highlights
Bogie frame is the base of carrying and transferring forces of many structural parts in the running gear of train
The dynamic fatigue strength assessment is based on the measured stress spectrum, and the fatigue life of the frame is predicted by calculating cumulative damage
This paper presents a fatigue strength analysis method by considering uncertainty of design parameters based on Goodman-Smith fatigue limit diagram (GSFLD) and reliability theory, and the practicability of the method is verified by employing new Goodman-Smith fatigue limit diagram (NGSFLD) for bogie frame
Summary
Bogie frame is the base of carrying and transferring forces of many structural parts in the running gear of train. JIS E4207-1992 (Track frames for railway rolling stock-General rules for design) and UIC ORE B12/RP17 (Tractive units-Bogies and running gear–Bogie frame structure strength tests) all take this diagram as design standard This diagram is usually understood as "fatigue limit diagram", which mainly includes the GSFLD of the base metal (outermost), butt weld (middle) and other weld (innermost). Tab. 6 and Tab. 7 show the range of variables and the D-optimal experimental design process, respectively
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