... fractal analysis. The results revealed that for all applied stress, the wear rates increased with increasing the sliding velocity of both samples. The wear rate of the rolled samples is greater than that of the extruded samples at the stress range from 3 to 5 MPa. However, when the stress is increased...

...A. Abouel-Kasem; F. A. Alturki; S. M. Ahmed In the present work, the topographical images of cavitation erosion surfaces at water and oil-in-water (o/w) emulsions were quantified using fractal analysis. The oil-in-water emulsion concentrations were 2, 5 and 10 wt. %, which are in the popular range...

...Shuyun Jiang; Yunjian Zheng; Hua Zhu A general contact stiffness model is proposed in this paper to study the contacts between rough surfaces of machined plane joints. The proposed model uses fractal geometry for surface topography description, elastic-plastic deformation of contacting asperities...

...Abouel-Kasem; M. A. Al-Bukhaiti; K. M. Emara; S. M. Ahmed In the present work, the topographical images of slurry erosion surfaces at different impact angles were quantified using fractal analysis. The study showed that the variation of fractal value of slope of linearized power spectral density...

...Y. F. Peng; Y. B. Guo; Y. Q. Hong The strong stiction of adjacent surfaces with meniscus is a major design concern in the devices with a microsized interface. The present research concerns the elastic adhesion of rough fractal surfaces in the presence of a thin liquid film. A rough fractal surface...

...K. Willner In a recent paper ( 2004, “Elasto-Plastic Normal Contact of Three-Dimensional Fractal Surfaces Using Halfspace Theory,” J. Tribol., 126, pp. 28–33 ) the author developed a halfspace model for the elasto-plastic normal contact of rough surfaces. This model is now used to study...

...Shao Wang; Ji Shen; Wai Kin Chan A fractal dimension and a fractal roughness parameter are usually used to characterize a fractal surface. For a fractal-regular surface, a fractal domain length is also included. Such a formulation is based on an approximation using a constant value of the fractal...

... contact parameter and the dimensionless roughness parameter, which are both independent of the instrument resolution, thus providing a long awaited solution to the problem of instrument dependency in a traditional theory. An application to fractal-regular surfaces indicates that the influence...

... viscoelastic constitutive law, the standard linear solid (SLS) law. The model aims at studying the normal compliance (approach) of the punch surface, which will be assumed to be quasistatic, as a function of the applied creep load. The roughness of the punch surface is assumed to be fractal in nature...

... analytically using a fractal approach to describe the nanoscale asperity interactions at low loads and also taking into account the influence of relevant parameters including the surface forces. The important observation here is that in addition to the dependence on load, speed, and material parameters...

...Jeng Luen Liou; Jen Fin Lin Instead of a general consideration of the fractal dimension ( D ) and the topothesy ( G * ) as two invariants in the fractal analysis of surface asperities, these two roughness parameters in the present study are varied by changing the mean separation ( d * ) of two...

... more correctly, that of Aramaki-Majumbdar-Bhushan (AMB). Here, numerical experiments confirm that with a Weierstrass series fractal profile (taken as a 2D slice of a true fractal surface but then used to define a set of circular asperities), load and conductance for numerically measured asperities...

...Lior Kogut; Robert L. Jackson Statistical and fractal approaches for characterizing surface topography have been used widely in contact mechanics. In the present study, a comparison is conducted between contact mechanics results obtained with statistical and fractal approaches to characterize...

... method to avoid the problem of being difficult to give the correct boundary conditions for the frictional heat conduction at an asperity. The mean contact area of an asperity which is needed in the heat transfer analysis is here obtained by a new fractal model. This fractal model is established from...

...J. Yang, Graduate Student; K. Komvopoulos, Professor Fellow ASME A contact mechanics theory of static friction is presented for isotropic rough surfaces exhibiting fractal behavior. The analysis is based on a piecewise power-law size distribution and a normal slope distribution of the asperity...

...Z.-Q. Gong, Graduate Student; K. Komvopoulos, Professor Fellow ASME A thermomechanical analysis is presented for a semi-infinite elastic solid sliding against a rigid, rough surface characterized by fractal geometry. A piecewise-linear distribution of the contact pressure was obtained...

...Clint A. Morrow; Michael R. Lovell The stiction forces that exist in microelectromechanical systems (MEMS) are characterized by surface energy and surface roughness. To simulate this contact condition, a three-dimensional fractal surface geometry and an adhesive contact model for a single asperity...

...Jung Ching Chung, Graduate Student; Jen Fin Lin An elastic-plastic asperity fractal model for analyzing the contact of rough surfaces is presented. Instead of using the power-law relation, which is widely used to predict the number, N , of contact spots with the area larger than the area...

...Shao Wang, Associate Professor, Mem. ASME The concept of a fractal-regular surface, with a dual-section power spectrum, has been implemented in an elastic-plastic contact analysis. Under certain assumptions, the analysis of individual fractal domains can be decoupled from that of the macroscopic...

...K. Willner The elasto-plastic normal contact of fractal surfaces is investigated. To study the influence of several surface parameters like fractal dimension and resolution, the surfaces are numerically generated using a special form of the structure function which is motivated by measurements...