Sub-modelling based fatigue evaluation of welded details in composite trapezoidal corrugated web girders under coupled thermal-structural loading

IF 5.7 2区材料科学 Q1 ENGINEERING, MECHANICAL

International Journal of Fatigue Pub Date : 2024-11-03 DOI:10.1016/j.ijfatigue.2024.108685

Zhi-Yu Wang , Lin-Hai Shi , Yong-Bo Shao , Qi-Fei Wang

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引用次数: 0

Abstract

Exploring the long-term performance of welded details in composite trapezoidal corrugated web (TCW) girders is a significant focus for the service life of these structures exposed to atmospheric environment and traffic flow. The majority of the present studies have been conducted without accounting for thermal stresses induced by temperature differences and accurately reflecting internal force transfers for the composite girders in flexural bending. The fatigue behaviour of the welded details in these girders under coupled thermal-structural loading is investigated herein through experimental and numerical methods. The results indicated three stages for the structural degradation from the test performance and justified a proper allowance of the cross-sectional stress in coordination with the flexural curvature in the derivation of S-N relations comparable to similar details in related design codes. A sub-modelling procedure is implemented to capture the thermal gradient, the local stress concentration, and the crack distribution in global modelling while replicate the semi-elliptical surface crack at the external side of the fillet weld toe in local modelling. The fatigue lives predicted from the proposed analytical model match reasonably well with experimental and numerical results, indicating its good applicability incorporating characteristic geometric correction factors into classical theoretical calculation for fatigue evaluation.

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基于子模型的梯形波纹复合腹板梁焊接细节在热结构耦合载荷下的疲劳评估

对于暴露在大气环境和交通流中的复合材料梯形波纹腹板（TCW）大梁而言，探索其焊接细节的长期性能是这些结构使用寿命的一个重要焦点。目前的大多数研究都没有考虑温差引起的热应力，也没有准确反映复合梁在弯曲时的内力传递。本文通过实验和数值方法研究了这些大梁的焊接细节在热-结构耦合载荷作用下的疲劳行为。结果表明，从测试性能来看，结构退化分为三个阶段，并证明在推导与相关设计规范中类似细节相当的 S-N 关系时，应适当考虑横截面应力与弯曲曲率的协调。在全局建模中，采用了子建模程序来捕捉热梯度、局部应力集中和裂纹分布，而在局部建模中，则复制了角焊趾外侧的半椭圆形表面裂纹。根据所提出的分析模型预测的疲劳寿命与实验和数值结果相当吻合，这表明在疲劳评估的经典理论计算中加入几何特征修正因子具有良好的适用性。

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 Fatigue 工程技术-材料科学：综合

CiteScore

10.70

自引率

21.70%

发文量

619

审稿时长

58 days

期刊介绍： Typical subjects discussed in International Journal of Fatigue address: Novel fatigue testing and characterization methods (new kinds of fatigue tests, critical evaluation of existing methods, in situ measurement of fatigue degradation, non-contact field measurements) Multiaxial fatigue and complex loading effects of materials and structures, exploring state-of-the-art concepts in degradation under cyclic loading Fatigue in the very high cycle regime, including failure mode transitions from surface to subsurface, effects of surface treatment, processing, and loading conditions Modeling (including degradation processes and related driving forces, multiscale/multi-resolution methods, computational hierarchical and concurrent methods for coupled component and material responses, novel methods for notch root analysis, fracture mechanics, damage mechanics, crack growth kinetics, life prediction and durability, and prediction of stochastic fatigue behavior reflecting microstructure and service conditions) Models for early stages of fatigue crack formation and growth that explicitly consider microstructure and relevant materials science aspects Understanding the influence or manufacturing and processing route on fatigue degradation, and embedding this understanding in more predictive schemes for mitigation and design against fatigue Prognosis and damage state awareness (including sensors, monitoring, methodology, interactive control, accelerated methods, data interpretation) Applications of technologies associated with fatigue and their implications for structural integrity and reliability. This includes issues related to design, operation and maintenance, i.e., life cycle engineering Smart materials and structures that can sense and mitigate fatigue degradation Fatigue of devices and structures at small scales, including effects of process route and surfaces/interfaces.