Effects of temperature changes on the thermomechanical behavior and interface stress of longitudinal connected slab track

IF 5.9 2区 工程技术 Q1 ENGINEERING, MULTIDISCIPLINARY
Xuhao Cui , Yapeng Liu , Hongbin Xu , Hong Xiao , Yihao Chi , Shaolei Wei , Yanliang Du
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引用次数: 0

Abstract

In the context of modern railway systems, ensuring the structural integrity and longevity of longitudinal connected slab tracks under variable environmental conditions is paramount. This study aims to address the critical gap in understanding how diurnal temperature variations affect the deformation and interface integrity of such tracks, specifically within the framework of the China Railway Track System II (CRTS II). Employing a sophisticated three-dimensional model and leveraging the cohesive zone model (CZM) for simulating interface bonding behaviors, the research meticulously evaluates the temperature profiles, thermal deformations, and interface stresses of the slab track under daily thermal fluctuations. Notable findings include the observation of significantly higher temperature gradients in summer, with peak positive gradients approximately twice those of negative gradients. The analysis reveals pronounced deformation near the slab edges—arching due to positive gradients and warping under negative gradients, with arching deformation magnitudes substantially exceeding those of warping. Interface stress distribution proved to be non-uniform, with the highest stress concentrations near the slab edges reaching up to 0.094 MPa at 13:00. Seasonally, summer presents the greatest challenge regarding thermal deformation, interface stress, and damage, underscoring the necessity for enhanced monitoring and maintenance strategies during high daytime temperatures. The investigation concludes with the finding that minor interlayer bonding damage predominantly occurs at the track edges, yet does not escalate to full bonding failure or extensive cracking, thus preserving the structural integrity overall.
温度变化对纵向连接板坯轨道热力学行为和界面应力的影响
在现代铁路系统的背景下,确保在各种环境条件下纵向连接板轨道的结构完整性和寿命是至关重要的。本研究旨在解决理解日温度变化如何影响此类轨道的变形和界面完整性的关键空白,特别是在中国铁路轨道系统II (CRTS II)的框架内。采用复杂的三维模型并利用黏合区模型(CZM)模拟界面结合行为,研究人员仔细评估了在日常热波动下板坯轨道的温度分布、热变形和界面应力。值得注意的是,夏季温度梯度显著升高,正梯度峰值约为负梯度峰值的两倍。分析表明,在板坯边缘附近有明显的变形——正梯度作用下的拱起和负梯度作用下的翘曲,且拱起变形幅度大大超过翘曲。界面应力分布不均匀,在13:00时,板坯边缘处应力集中最高,达到0.094 MPa。从季节上看,夏季在热变形、界面应力和损伤方面面临着最大的挑战,这强调了在白天高温下加强监测和维护策略的必要性。调查的结论是,轻微的层间粘合损伤主要发生在轨道边缘,但不会升级到完全粘合失效或广泛开裂,从而保持了整体结构的完整性。
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
Ain Shams Engineering Journal
Ain Shams Engineering Journal Engineering-General Engineering
CiteScore
10.80
自引率
13.30%
发文量
441
审稿时长
49 weeks
期刊介绍: in Shams Engineering Journal is an international journal devoted to publication of peer reviewed original high-quality research papers and review papers in both traditional topics and those of emerging science and technology. Areas of both theoretical and fundamental interest as well as those concerning industrial applications, emerging instrumental techniques and those which have some practical application to an aspect of human endeavor, such as the preservation of the environment, health, waste disposal are welcome. The overall focus is on original and rigorous scientific research results which have generic significance. Ain Shams Engineering Journal focuses upon aspects of mechanical engineering, electrical engineering, civil engineering, chemical engineering, petroleum engineering, environmental engineering, architectural and urban planning engineering. Papers in which knowledge from other disciplines is integrated with engineering are especially welcome like nanotechnology, material sciences, and computational methods as well as applied basic sciences: engineering mathematics, physics and chemistry.
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