In-situ measurements of contact evolution for fractal rough surfaces under normal compression

IF 3.4 3区 工程技术 Q1 MECHANICS
Shaoqi Huang , Deheng Wei , Wenwen Han , Hengxu Song , Siyang Song , Yixiang Gan , Chongpu Zhai , Minglong Xu
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引用次数: 0

Abstract

The contact interface plays a key role in the overall functionality and stability of structures. Understanding the evolution of the contact interface over time and its dependency on materials and load is crucial for functional integrity and operational safety assessment. In this study, we employ in-situ three-dimensional X-ray computed tomography (3DXRCT) to examine the creep behavior of 3D-printed surfaces exhibiting various roughness under constant normal compression. We observe that the overall contact area enlargement during the contact creep decreases with roughness amplitude and fractal dimension. The variation of interfacial separation distance is found to increase with roughness amplitude and decrease with fractal dimension. Correlation analysis reveals that the microcontact size played a more important role than the asperity shape in determining the microcontact enlargement. By examining the calculated interfacial strains extracted from XRCT measurements, significant deformations are found to occur at the non-contacting zones, indicating strong asperity interactions. This study offers high-resolution experimental measurements and unravels the asperity micromechanics for contact creep on rough surfaces, providing insights into understanding and optimizing the performance of rough interfaces.

法向压缩下分形粗糙表面接触演化的现场测量结果
接触界面对结构的整体功能和稳定性起着关键作用。了解接触界面随时间的演变及其与材料和载荷的关系对于功能完整性和运行安全评估至关重要。在本研究中,我们采用原位三维 X 射线计算机断层扫描(3DXRCT)技术,研究了在恒定法向压缩条件下呈现不同粗糙度的三维打印表面的蠕变行为。我们观察到,在接触蠕变过程中,整体接触面积的扩大随粗糙度振幅和分形维度的增加而减小。界面分离距离的变化随粗糙度振幅增大而增大,随分形维度增大而减小。相关分析表明,在决定微接触扩大方面,微接触尺寸比表面形状起更重要的作用。通过研究从 XRCT 测量中提取的界面应变计算结果,发现非接触区发生了显著的变形,这表明非晶体之间存在强烈的相互作用。这项研究提供了高分辨率的实验测量结果,揭示了粗糙表面接触蠕变的非接触微观力学,为理解和优化粗糙界面的性能提供了启示。
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
CiteScore
6.70
自引率
8.30%
发文量
405
审稿时长
70 days
期刊介绍: The International Journal of Solids and Structures has as its objective the publication and dissemination of original research in Mechanics of Solids and Structures as a field of Applied Science and Engineering. It fosters thus the exchange of ideas among workers in different parts of the world and also among workers who emphasize different aspects of the foundations and applications of the field. Standing as it does at the cross-roads of Materials Science, Life Sciences, Mathematics, Physics and Engineering Design, the Mechanics of Solids and Structures is experiencing considerable growth as a result of recent technological advances. The Journal, by providing an international medium of communication, is encouraging this growth and is encompassing all aspects of the field from the more classical problems of structural analysis to mechanics of solids continually interacting with other media and including fracture, flow, wave propagation, heat transfer, thermal effects in solids, optimum design methods, model analysis, structural topology and numerical techniques. Interest extends to both inorganic and organic solids and structures.
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