表征表面波动各向异性的新型压舱粗糙度指标及其在重复压舱表面定向摩擦中的应用

IF 4.6 2区工程技术 Q2 ENGINEERING, CHEMICAL

Powder Technology Pub Date : 2025-07-26 DOI:10.1016/j.powtec.2025.121457

Lihua Xue , Junhua Xiao , Jiapei Ma , Kaichao Wang , Yunbo Huo

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引用次数: 0

摘要

压载颗粒的摩擦系数是影响压载床动稳定性的关键参数。目前，常用摩擦试验来研究压舱物的摩擦特性。然而，表面粗糙度的各向异性导致摩擦系数的显著方向性变化。传统的粗糙度指数不能充分捕捉这些特征，阻碍了摩擦系数和表面形貌之间的定量关联。为了解决这一问题，本研究分析了584个实际压载颗粒表面粗糙度各向异性的统计特征。在此基础上，提出了综合地表起伏幅度、倾斜度及其各向异性的综合粗糙度指数。通过与常规粗糙度指标的比较，验证了所提指标的有效性。然后，将新粗糙度指标应用于沿正交方向进行的压舱摩擦试验。该指标与相应方向上的摩擦系数呈线性相关关系。此外，摩擦力的方向差异随着法向载荷的增加而减小，表明在高应力条件下粗糙度的影响减小。

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A novel ballast roughness index for characterizing the surface undulation anisotropy and its application in directional friction of replicated ballast surfaces

The friction coefficient of ballast particles is a critical parameter influencing the dynamic stability of ballasted beds. Currently, friction tests are commonly used to study ballast friction behavior. However, the anisotropy of surface roughness causes significant directional variations in friction coefficients. Conventional roughness indices fail to adequately capture these features, hindering quantitative correlations between friction coefficients and surface morphology. To address this issue, this study analyzed the statistical characteristics of surface roughness anisotropy from 584 real ballast particles. Based on the findings, a comprehensive roughness index was proposed, incorporating surface undulation amplitude, inclination and its anisotropy. The validity of the proposed index was confirmed through a comparison with conventional roughness indices. Then, the new roughness index was applied to ballast friction tests conducted along orthogonal directions. A linear correlation was identified between the index and the friction coefficients in the corresponding directions. In addition, the directional difference in friction was found to decrease with increasing normal load, indicating a reduced influence of roughness under higher stress conditions.

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来源期刊

Powder Technology 工程技术-工程：化工

CiteScore

9.90

自引率

15.40%

发文量

1047

审稿时长

46 days

期刊介绍： Powder Technology is an International Journal on the Science and Technology of Wet and Dry Particulate Systems. Powder Technology publishes papers on all aspects of the formation of particles and their characterisation and on the study of systems containing particulate solids. No limitation is imposed on the size of the particles, which may range from nanometre scale, as in pigments or aerosols, to that of mined or quarried materials. The following list of topics is not intended to be comprehensive, but rather to indicate typical subjects which fall within the scope of the journal's interests: Formation and synthesis of particles by precipitation and other methods. Modification of particles by agglomeration, coating, comminution and attrition. Characterisation of the size, shape, surface area, pore structure and strength of particles and agglomerates (including the origins and effects of inter particle forces). Packing, failure, flow and permeability of assemblies of particles. Particle-particle interactions and suspension rheology. Handling and processing operations such as slurry flow, fluidization, pneumatic conveying. Interactions between particles and their environment, including delivery of particulate products to the body. Applications of particle technology in production of pharmaceuticals, chemicals, foods, pigments, structural, and functional materials and in environmental and energy related matters. For materials-oriented contributions we are looking for articles revealing the effect of particle/powder characteristics (size, morphology and composition, in that order) on material performance or functionality and, ideally, comparison to any industrial standard.