Data-driven investigations on the fatigue resistance of joints welded with low-transformation-temperature effects

IF 4 2区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Journal of Constructional Steel Research Pub Date : 2025-07-01 DOI:10.1016/j.jcsr.2025.109762

Helen Bartsch

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Abstract

This article presents investigations on the influence of the low-transition-temperature (LTT) effect on the fatigue strength of two fatigue details: the butt-welded joint and the longitudinal stiffener. Basis is the detailed European fatigue test database including an extension of additional literature specifically dealing with specimens welded with alloyed wires to achieve an LTT effect. Main findings include the following results: LTT-welded specimens exhibit significantly increased fatigue strength values compared to conventionally welded ones for both investigated details. In the case of the butt-welded joint, compressive residual stresses and reduced notch severity enhance the beneficial effect of higher base material yield strength; however, no such enhancement is observed for the longitudinal stiffener, where the pronounced notch effect dominates. Based on the findings, an upgrade of fatigue detail categories is proposed for LTT-welded joints, depending on the base material yield strength. Future research will focus on further experimental validation to support the proposed adjustments.

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低变形温度效应焊接接头抗疲劳性能的数据驱动研究

本文研究了低过渡温度（LTT）效应对对接焊接接头和纵向加强筋两个疲劳细节疲劳强度的影响。基础是详细的欧洲疲劳试验数据库，包括专门处理用合金丝焊接试样以达到LTT效果的附加文献的扩展。主要发现包括以下结果：与常规焊接试样相比，ltt焊接试样在两方面的疲劳强度值都有显著提高。在对接焊接接头中，残余压应力和缺口程度的降低增强了基材屈服强度提高的有利效果；然而，没有这样的增强是观察纵向加劲，其中明显的缺口效应占主导地位。在此基础上，根据基材屈服强度的不同，提出了ltt焊接接头疲劳细节分类的升级方案。未来的研究将集中于进一步的实验验证，以支持所提出的调整。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Constructional Steel Research 工程技术-工程：土木

CiteScore

7.90

自引率

19.50%

发文量

550

审稿时长

46 days

期刊介绍： The Journal of Constructional Steel Research provides an international forum for the presentation and discussion of the latest developments in structural steel research and their applications. It is aimed not only at researchers but also at those likely to be most affected by research results, i.e. designers and fabricators. Original papers of a high standard dealing with all aspects of steel research including theoretical and experimental research on elements, assemblages, connection and material properties are considered for publication.