Peridynamic analysis of rolling contact fatigue crack propagation in rail welding joints with pore defects

IF 5.7 2区材料科学 Q1 ENGINEERING, MECHANICAL

International Journal of Fatigue Pub Date : 2024-09-18 DOI:10.1016/j.ijfatigue.2024.108612

Shirui Li , Xiaoming Wang , Weijia Dong , Qing He , Boyang An , Ping Wang , Bing Yang

引用次数: 0

Abstract

Pore defects are prevalent in rail welding joints and significantly contribute to the propagation of fatigue cracks. This study develops a peridynamic (PD) model that incorporates the characteristics of pore defects to analyze their impact on rolling contact fatigue behavior. Initially, compact tension (CT) fatigue tests were performed to derive and validate the bond fatigue failure model specific to rail weld materials. Subsequently, pore defects were modeled as holes in the CT specimens, with experimental results being compared to PD simulation outcomes for validation. Finally, a wheel-rail contact PD model was constructed to investigate the mechanisms of fatigue crack propagation in rail welding joints affected by pore defects.

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具有孔隙缺陷的轨道焊接接头中滚动接触疲劳裂纹扩展的周动态分析

孔隙缺陷在钢轨焊接接头中非常普遍，对疲劳裂纹的扩展起着重要作用。本研究开发了一种结合孔隙缺陷特征的周动态 (PD) 模型，以分析其对滚动接触疲劳行为的影响。首先，进行了紧凑拉伸（CT）疲劳试验，以推导和验证轨道焊接材料特有的结合疲劳失效模型。随后，将孔隙缺陷建模为 CT 试样中的孔，并将实验结果与 PD 模拟结果进行比较，以进行验证。最后，构建了轮轨接触 PD 模型，以研究受孔隙缺陷影响的钢轨焊接接头中疲劳裂纹的扩展机制。

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.