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Contact area

About: Contact area is a research topic. Over the lifetime, 12358 publications have been published within this topic receiving 256401 citations. The topic is also known as: contact patch & contact region.


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Journal ArticleDOI
TL;DR: In this paper, the axisymmetric problem of a frictionless receding contact between an elastic functionally graded layer and a homogeneous half-space, when the two bodies are pressed together, is considered.

64 citations

Journal ArticleDOI
TL;DR: In this paper, the average surface roughness in the dry machining of Duplex Stainless Steel (DSS) and the determination of load curves together with roughness profiles for various cutting conditions were compared.
Abstract: The objective of the investigation was to identify surface roughness after turning with wedges of coated sintered carbide. The investigation included predic ting the average surface roughness in the dry machining of Duplex Stainless Steel (DSS) and the determination of load curves together with roughness profiles for various cutting conditions. The load curves and roughness profiles for various cutting wedges and variable cutting parameters were compared. It has been shown that dry cutting leads to a decrease in friction for lubricated surfaces, providing a small initial contact area where the surface is contacted. The st udy has been performed within a production facility during the production of electric motor parts and deep-well pumps. Keywords: turning, coatings, friction-reducing, optical microscopy, surface roughness analysis and models. © 2014 Polish Academy of Sciences. All rights reserved 1. Introduction Engineering surfaces, particularly those generated using multi-step manufacturing processes and intended for tribological applications such as bearings and gears, rarely if ever have perfectly normal distributed elevations [1]. Surface roughness measurements of any workpiece are among the most important ones in length and angle metrology, both in theory and practice. According to Wieczorowski et al. [2], there are great discrepancies in these measurements because of the large variety of instruments for surface roughness analysis. Hence, three-dimensional surface topography parameters are necessary for assessing the surface roughness characteristics more effectively [3]. According to Mahovic Poljacek et al. [4], a precise characterization of roughness and surface topography is of prime importance in many engineering industries because certain functional properties of the materials are often determined by the surface structure and characteristics. Estimation of the magnitude of surface roughness under the given cutting conditions resulting from metal removal operations is one of the major goals in this area [5, 6]. According to Benardos and Vosniakos [7], surface roughness is a widely used index of product quality and in most cases a technical requirement for mechanical products. Achieving the desired surface quality is of great importance for the functional behaviour of a part. Surface profilometry is for many years a well-known method of topography inspection [8–12]. Topography parameters represent surface properties is much better than 2D ones. Using the surface parameters can be determined functions describing surface behaviour. The workpiece material is duplex stainless steel because this stainless steel is widely used for many industrial applications due to its unique properties. Cabrera et al. [13] and Park et al. [14] consider that the good combination of their mechanical properties (high strength and toughness) and corrosion resistance makes them of great interest for a wide range of

64 citations

Journal ArticleDOI
TL;DR: In this paper, Sneddon's solution for indentation of an elastic half-space by rigid axisymmetric indenters is used to determine elastic modulus and hardness.
Abstract: The fundamental relations used in the analysis of nanoindentation load–displacement data to determine elastic modulus and hardness are based on Sneddon’s solution for indentation of an elastic half-space by rigid axisymmetric indenters It has been recently emphasized that several features that have important implications for nanoindentation measurements are generally ignored The first one concerns the measurement of the contact depth, which is actually determined by using a constant value e = 075 for the geometry of a Berkovich indenter and for any kind of material, whereas the reality is that e is a function of the power law exponent deduced from the analysis of the unloading curve The second feature concerns the relation between contact stiffness, elastic modulus, and contact area, in which a correction factor γ larger than unity is usually ignored leading to a systematic overestimation of the area function and thus to errors in the measured hardness and modulus Experimental measurements on fused quartz are presented that show the variation of e with the geometry of the tip–sample contact; that is to say with the contact depth, as well as the existence of the correction factor γ, as predicted in some recent articles Effects of both e and γ on harness and modulus measurements are also shown

64 citations

Journal ArticleDOI
TL;DR: In this paper, an analysis of tire imprints and measured tire-pavement contact stress distribution leads to the conclusion that the shape of the contact area depends on the load and tire pressure.
Abstract: It is demonstrated that accurate characterization of tire-pavement contact stress distribution is important for the correct prediction of distress evolution in flexible pavements. First, an analysis of tire imprints and measured tire-pavement contact stress distribution leads to the conclusion that the shape of the contact area depends on the load and tire pressure and that the contact stress distribution is nonuniform. Second, software for a linear-layered elastic medium contrasts the stress distribution in a pavement due to two loads: a uniformly distributed pressure on a circular area and a distribution reported earlier by de Beer and Fisher. The analysis herein demonstrates that nonuniform contact stress distribution leads to considerably larger stresses in the pavement relative to the uniform stress distribution case. Consequently, both rut and crack evolution prediction would be different if they were based on true distribution rather than on the uniform distribution assumption. It is also shown tha...

64 citations

Journal ArticleDOI
TL;DR: In this paper, an analytical model accounting for the lateral liquid motion in the compressed area is developed and compared to the axisymmetric numerical solution of the inviscid (Euler) flow equations.
Abstract: The early phase of high-speed liquid droplet impact on a rigid wall is characterized by compressibility effects through the creation of a shock wave attached to the contact area periphery. Initially, the area of compressed liquid is assumed to be bounded by the shock envelope, which propagates both laterally and upwardly into the bulk of the liquid. In this paper, an analytical model accounting for the lateral liquid motion in the compressed area is developed and compared to the axisymmetric numerical solution of the inviscid (Euler) flow equations. It is shown that the often employed assumption that the compressed area is separated from the liquid bulk by a single shock wave attached to the contact line breaks down and results in an anomaly. This anomaly emerges prior to the time when the shock wave departs from the contact line, initiating lateral liquid jetting. In order to remove this anomaly, the analytical model presented in this paper proposes the transition from a single to a multiple wave structure in the contact line region, prior to jetting eruption. The occurrence of this more complex multiple wave structure is also supported by the numerical results.

64 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023102
2022253
2021375
2020467
2019554
2018528