Multiscale modelling strategy for predicting fatigue performance of welded joints

IF 7.1 1区工程技术 Q1 ENGINEERING, MECHANICAL

International Journal of Mechanical Sciences Pub Date : 2024-09-24 DOI:10.1016/j.ijmecsci.2024.109751

Hongchang Zhou , Masao Kinefuchi , Yasuhito Takashima , Kazuki Shibanuma

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Abstract

This study predicts the fatigue performance of welded joints through a multiscale modelling strategy accounting for material and structural inhomogeneities. An S-N curve and detailed fracture surfaces with distinct beach marks were first derived by uniaxial fatigue tests utilising the designed cruciform welded joints. Considering the intrinsic features of welded joints, a multiscale modelling strategy was proposed to integrate multiple factors, including microstructural variations, strength distributions within the heat-affected zone (HAZ), and the diversity of three-dimensional weld toe shapes. Significantly, a modelling strategy was presented for the first time to simulate the simultaneous initiation, growth, and coalescence of multiple cracks, and was validated against experimental evidence. The results indicate that the proposed strategy can accurately predict both the fatigue strength and the overall crack growth process. Additionally, comparative assessments of single-crack and multiple-crack modelling strategies revealed notably shorter predicted fatigue lives when considering crack coalescence. Overall, this work establishes a multiscale framework for assessing the fatigue performance of welded joints considering both microscopic and macroscopic factors, offering substantial practical implications for engineering applications.

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预测焊接接头疲劳性能的多尺度建模策略

本研究通过考虑材料和结构不均匀性的多尺度建模策略来预测焊接接头的疲劳性能。首先利用设计的十字形焊接接头进行单轴疲劳试验，得出 S-N 曲线和带有明显海滩痕迹的详细断裂面。考虑到焊接接头的内在特征，提出了一种多尺度建模策略，以综合多种因素，包括微观结构变化、热影响区（HAZ）内的强度分布以及三维焊趾形状的多样性。重要的是，首次提出了模拟多条裂纹同时产生、生长和凝聚的建模策略，并根据实验证据进行了验证。结果表明，所提出的策略可以准确预测疲劳强度和整个裂纹生长过程。此外，对单裂纹和多裂纹建模策略的比较评估显示，在考虑裂纹凝聚的情况下，预测的疲劳寿命明显更短。总之，这项工作建立了一个考虑微观和宏观因素的多尺度框架，用于评估焊接接头的疲劳性能，为工程应用提供了重要的实际意义。

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

International Journal of Mechanical Sciences 工程技术-工程：机械

CiteScore

12.80

自引率

17.80%

发文量

769

审稿时长

19 days

期刊介绍： The International Journal of Mechanical Sciences (IJMS) serves as a global platform for the publication and dissemination of original research that contributes to a deeper scientific understanding of the fundamental disciplines within mechanical, civil, and material engineering. The primary focus of IJMS is to showcase innovative and ground-breaking work that utilizes analytical and computational modeling techniques, such as Finite Element Method (FEM), Boundary Element Method (BEM), and mesh-free methods, among others. These modeling methods are applied to diverse fields including rigid-body mechanics (e.g., dynamics, vibration, stability), structural mechanics, metal forming, advanced materials (e.g., metals, composites, cellular, smart) behavior and applications, impact mechanics, strain localization, and other nonlinear effects (e.g., large deflections, plasticity, fracture). Additionally, IJMS covers the realms of fluid mechanics (both external and internal flows), tribology, thermodynamics, and materials processing. These subjects collectively form the core of the journal's content. In summary, IJMS provides a prestigious platform for researchers to present their original contributions, shedding light on analytical and computational modeling methods in various areas of mechanical engineering, as well as exploring the behavior and application of advanced materials, fluid mechanics, thermodynamics, and materials processing.