Interfacial mechanical behavior of epoxy-quartz: MD nanoindentation and nanoscratching study

IF 5.6 1区工程技术 Q1 ENGINEERING, GEOLOGICAL

Acta Geotechnica Pub Date : 2024-12-27 DOI:10.1007/s11440-024-02503-9

Pengchang Wei, Zhen-Yu Yin, Pierre-Yves Hicher, Wangqi Xu

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引用次数: 0

Abstract

Fiber-reinforced polymer (FRP) is widely used in various engineering fields due to its several outstanding properties. In geotechnical engineering, the interactions between FRP and soil play an essential role. In this paper, molecular dynamics (MD) simulation method has been performed to study the interfacial mechanical behavior of epoxy-quartz interface as a subsystem of FRP-soil structure. Uniaxial traction on bulk epoxy was conducted to verify the accuracy of the model. The nanoindentation and nanoscratching mechanisms of epoxy-quartz interface were analyzed, considering the effect of loading rate, sliding velocity, and indentation depth. Abrasion models have been proposed based on the relationship between forces and displacements. Simulation results indicated that the indenter force and the indentation hardness of epoxy substrate increased with the loading rate during nanoindentation, and the relationship between indenter force and indentation depths could be expressed by a power law. The forces along three directions increased with the sliding velocity or indentation depths during nanoscratching, the sliding force and the sliding distance following an exponential function. The numerical simulations demonstrated that the surface wear of the epoxy substrate had the shape of a groove in nanoindentation and a fan-shaped distribution during the nanoscratching process.

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环氧树脂-石英的界面力学行为：MD纳米压痕和纳米划痕研究

纤维增强聚合物（FRP）以其优异的性能被广泛应用于各种工程领域。在岩土工程中，FRP与土体的相互作用起着至关重要的作用。本文采用分子动力学（MD）模拟方法研究了环氧树脂-石英界面作为frp -土壤结构子系统的界面力学行为。为了验证模型的准确性，进行了散装环氧树脂的单轴牵引实验。考虑加载速率、滑动速度和压痕深度的影响，分析了环氧树脂-石英界面的纳米压痕和纳米刮伤机理。基于力和位移之间的关系，提出了磨损模型。仿真结果表明，在纳米压痕过程中，压痕力和压痕硬度随加载速率的增加而增加，压痕力与压痕深度之间的关系可以用幂律表示。在纳米划痕过程中，三个方向上的作用力随滑动速度或压痕深度的增大而增大，作用力与滑动距离呈指数函数关系。数值模拟结果表明，在纳米划痕过程中，环氧基材料的表面磨损呈沟槽状，而在纳米划痕过程中则呈扇形分布。

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来源期刊

Acta Geotechnica ENGINEERING, GEOLOGICAL-

CiteScore

9.90

自引率

17.50%

发文量

297

审稿时长

4 months

期刊介绍： Acta Geotechnica is an international journal devoted to the publication and dissemination of basic and applied research in geoengineering – an interdisciplinary field dealing with geomaterials such as soils and rocks. Coverage emphasizes the interplay between geomechanical models and their engineering applications. The journal presents original research papers on fundamental concepts in geomechanics and their novel applications in geoengineering based on experimental, analytical and/or numerical approaches. The main purpose of the journal is to foster understanding of the fundamental mechanisms behind the phenomena and processes in geomaterials, from kilometer-scale problems as they occur in geoscience, and down to the nano-scale, with their potential impact on geoengineering. The journal strives to report and archive progress in the field in a timely manner, presenting research papers, review articles, short notes and letters to the editors.