RELATION OF KINEMATICS AND CONTACT FORCES IN THREE-BODY SYSTEMS WITH A LIMITED NUMBER OF PARTICLES

IF 10.1 2区 工程技术 Q1 ENGINEERING, MECHANICAL Facta Universitatis-Series Mechanical Engineering Pub Date : 2022-04-08 DOI:10.22190/fume210310035p
Kristin M. de Payrebrune
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引用次数: 4

Abstract

In many tribological systems, an intermediate layer of a limited number of abrasive particles exist. Thereby, the resulting wear and friction phenomena are desirable in many manufacturing processes, such as lapping or polishing, whereas in machine elements, they are unwanted due to reducing lifetime or performance.For a better understanding of the contact phenomena and the interaction of tribological systems with an intermediate layer of a limited number of particles, fundamental investigations are carried out on a tribometer test rig. For this purpose, two test scenarios are investigated, a) the kinematics and contact forces of single geometrically defined particles such as dodecahedron, icosahedron and hexahedron, and b) the contact forces and surface roughness of a layer of silicon carbide particles of different sizes.The measured ratio of tangential to normal force can be used as an indicator of the dominating kinematics of the particles and of the generated surface roughness, respectively. The higher the force ratio, the higher the tendency to slide for a given particle type and paring of particle and counter body.For one geometrically defined particle the short-time Fourier transform additionally helps to distinguish the state of motion since the excited frequencies during rolling are reduced.  For a layer of silicon carbide particles, the velocity and particle size have the strongest influence on the overall motion and the surface roughness produced. Larger particles tend to slide and create more scratches, while smaller particles tend to roll and create indentations in the counter body. Furthermore, for the same particle size, an increase in velocity causes a transition from sliding to rolling, resulting in an increased surface roughness.
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有限粒子数三体系统的运动学与接触力关系
在许多摩擦学系统中,存在一个由有限数量的磨料颗粒组成的中间层。因此,由此产生的磨损和摩擦现象在许多制造过程中是可取的,例如研磨或抛光,而在机器元件中,由于寿命或性能降低,它们是不需要的。为了更好地理解接触现象和摩擦系统与有限数量颗粒中间层的相互作用,在摩擦计试验台上进行了基础研究。为此,研究了两种测试场景,a)几何定义的单个颗粒(如十二面体、二十面体和六面体)的运动学和接触力,b)不同尺寸碳化硅颗粒层的接触力和表面粗糙度。测得的切向力与法向力的比值可以分别作为颗粒的主要运动学和生成的表面粗糙度的指标。对于给定的粒子类型和粒子与反体的配对,力比越高,滑动的倾向越高。对于一个几何定义的粒子,短时傅里叶变换还有助于区分运动状态,因为在滚动过程中激发频率降低了。对于一层碳化硅颗粒,速度和粒度对整体运动和产生的表面粗糙度影响最大。较大的颗粒倾向于滑动并造成更多的划痕,而较小的颗粒倾向于滚动并在计数器上造成压痕。此外,对于相同粒径的颗粒,速度的增加导致从滑动到滚动的转变,导致表面粗糙度的增加。
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来源期刊
CiteScore
14.40
自引率
2.50%
发文量
12
审稿时长
6 weeks
期刊介绍: Facta Universitatis, Series: Mechanical Engineering (FU Mech Eng) is an open-access, peer-reviewed international journal published by the University of Niš in the Republic of Serbia. It publishes high-quality, refereed papers three times a year, encompassing original theoretical and/or practice-oriented research as well as extended versions of previously published conference papers. The journal's scope covers the entire spectrum of Mechanical Engineering. Papers undergo rigorous peer review to ensure originality, relevance, and readability, maintaining high publication standards while offering a timely, comprehensive, and balanced review process.
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