Low-cycle fatigue properties and fracture location transition mechanism of dissimilar steel welded joints in towers of wind turbines

IF 5.7 2区材料科学 Q1 ENGINEERING, MECHANICAL International Journal of Fatigue Pub Date : 2024-10-24 DOI:10.1016/j.ijfatigue.2024.108672

Yarong Liu , Baoming Gong , Shuo Liu , Caiyan Deng , Yangyang Zhao , Yong Liu , Weitao Hu

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Abstract

This study investigates the low-cycle fatigue (LCF) behavior of two types of dissimilar steel welded joints (DSWJs): AISI 1035 & S550Q and AISI 1020 & S550Q. Digital image correlation (DIC) and finite element analysis (FEA) were used to analyze the heterogeneous strain distribution. The results reveal that the location of maximum strain, which is load-dependent and related to strength mismatch, corresponds to the fracture location of the LCF specimens. Specifically, the crack initiation site shifts from the weld toe to the base metal as strain increases. Moreover, the weld reinforcement of the DSWJs significantly affects the failure site transition, introducing strain concentration at lower stress levels while enhancing deformation resistance at higher stress levels, as evidenced by DIC strain measurements and FEA. These findings highlight the importance of joint reinforcement profile, strength mismatch and external load level in designing DSWJs for wind turbine towers against LCF failure.

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风力涡轮机塔架异种钢焊接接头的低循环疲劳特性和断裂位置转换机制

本研究调查了两种异种钢焊接接头（DSWJs）的低循环疲劳（LCF）行为：AISI 1035 & S550Q 和 AISI 1020 & S550Q。采用数字图像相关（DIC）和有限元分析（FEA）来分析异质应变分布。结果表明，最大应变的位置与 LCF 试样的断裂位置相对应，而最大应变的位置与载荷有关，并与强度失配相关。具体来说，随着应变的增加，裂纹起始位置从焊趾处转移到母材。此外，DSWJ 的焊接加固显著影响了断裂位置的转变，在较低应力水平上引入了应变集中，而在较高应力水平上增强了抗变形能力，这一点已被 DIC 应变测量和有限元分析所证实。这些发现突出表明，在设计用于风力涡轮机塔架的 DSWJ 以防止 LCF 失效时，接头加固轮廓、强度失配和外部载荷水平非常重要。

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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.