Fatigue Design of Welded Components of Railway Vehicles — Influence of Manufacturing Conditions and Weld Quality

Kassner, M.; Küppers, Martin; Sonsino, Cetin Morris; Bieker, Guido; Moser, Christian

doi:10.1007/bf03266739

Cited by 12 publications

(9 citation statements)

References 2 publications

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“…Test results from manufacturer C (triangles) can be assessed with the S-N f curve of model A10, while manufacturer B (circles) refers better to model C10 with higher imperfections. [45][46][47][48] were obtained from specimens with thicknesses of 10 to 20 mm and marked according to their mode of failure and stress ratio R. The experimental database contains results of test specimens with yield strengths in the range of 215 to 765 N/mm 2 . The computed S-N f curves are limited to a stress range of 355 N/mm 2 as the stress ratio was R = 0.…”

Section: Results Of the Two-stage-modelmentioning

confidence: 99%

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Towards a prognosis of fatigue life using a Two‐Stage‐Model

Röscher

Knobloch

2019

Steel Construction

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Nominated for the Bernt Johansson Outstanding Paper Awards at Nordic Steel 2019 This paper presents a Two‐Stage‐Model for determining the fatigue life of steel structures. The model follows the distinction between crack initiation and crack propagation according to the phenomenological background. The first stage uses the local strain‐life approach to predict the number of cycles for crack initiation Ni considering the cyclic material behaviour as well as the load‐time history. The second stage calculates the crack propagation based on a linear‐elastic fracture mechanics approach. Using X‐FEM in combination with cyclic loading, an arbitrary, solution‐dependent crack path is achieved to determine the number of cycles for propagation Np. The Two‐Stage‐Model was applied to butt welds to determine their total fatigue life Nf in terms of a proof‐of‐concept study. The study investigated the ability of the model to consider the influence of the weld geometry, i.e. plate thickness and weld imperfections (excess and vertical offset). The results are presented by means of S‐N curves for initiation life, propagation life and total fatigue life. A comparison with experimental results provided in the literature shows that the Two‐Stage‐Model can reflect the weld quality of butt welds in terms of fatigue life.

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Section: Results Of the Two-stage-modelmentioning

confidence: 99%

“…10 shows a brief example of the reflection of individual weld quality. The experimental results of [45] were used Fig. 10.…”

Section: Resultsmentioning

confidence: 99%

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Towards a prognosis of fatigue life using a Two‐Stage‐Model

Röscher

Knobloch

2019

Steel Construction

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“…Kassner et al [6] state that weld quality, e.g., the real weld toe radii, has a significant influence on fatigue strength. According to Björk et al [7], design criteria and requirements depend on the primary function of the joint.…”

Section: Empirical Studymentioning

confidence: 99%

Facilitating decision-making by choosing an NDT method based on information need

Öberg

Hammersberg

2016

Weld World

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This paper discusses the choice of an NDT method (non-destructive testing) from an information need perspective. It bridges the gap between technical methods, monitoring procedures and the need for information in an industrial application. The simple pull approach described starts from the decision that needs to be taken rather than from a previous data push procedure. That makes it more likely to match the method with the actual need, which leads to more effective and efficient evaluations. The pull approach is described by using a case from the welding industry, evaluation of the weld toe radius. The toe radius, defining how smooth the transition between the plate and the weld is, has been found critical to fatigue strength. Depending on the internal customer's need of information, various evaluation solutions are preferred. The methods range from manual gauges to fully automated camera solutions. An interview study performed shows that the current process for choosing evaluation method differs. The person needing the information is often not the starting point in the process. A change in starting point influences both the choice of NDT method and visualization and thereby how efficient and effective the decision-making support will be. The financial effect is significant.

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“…Welded components are widely used in rail vehicle structures and associated equipment, such as vehicular frames and bogie structures. It is well known that the fatigue behaviors in these structures are mainly controlled by the fatigue performance of welded joints, [1][2][3][4][5][6] in which stress concentration behaviors at welded joints play the critical role in determining the overall structural lives. 1,[6][7][8][9][10] Thus, the classical joint design principles, as stated in, 1,11 for example, "keep stress concentration to a minimum" and "let the component be deformable in its expected manner, not to introduce secondary deformation and secondary stress…" should be followed for ensuring adequate design fatigue life of a given structure in service.…”

Section: Introductionmentioning

confidence: 99%

Quantitative fatigue evaluation of complex welded connections and application in a train traction motor frame component

Chen

Dong

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part F:

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Welded connections are common in rail vehicle structures and associated equipment. It is well known that fatigue behaviors of welded structure are controlled by fatigue capability of welded joints. Although there exists numerous joint design guidance in Codes and Standards as well as best practices, they are largely empirical and difficult to apply in fatigue assessment of complex joints. In this paper, we adopt a mesh-insensitive structural stress method recently stipulated by ASME Code for fatigue evaluation of pressure vessels and piping components. Starting with stress concentration evaluation of two typical, but complex welded connections of relevance to some rail vehicle structures, we examine how the joint design principle inferred from the two examples can be effectively applied to an actual traction motor frame design and its effective fatigue improvement method. The experimental validation process is also presented for the proposed fatigue improvement technique.

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Fatigue Design of Welded Components of Railway Vehicles — Influence of Manufacturing Conditions and Weld Quality

Cited by 12 publications

References 2 publications

Towards a prognosis of fatigue life using a Two‐Stage‐Model

Towards a prognosis of fatigue life using a Two‐Stage‐Model

Facilitating decision-making by choosing an NDT method based on information need

Quantitative fatigue evaluation of complex welded connections and application in a train traction motor frame component

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