New adhesive wear law of micromechanical surface contact (original) (raw)
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Adhesive wear theory of micromechanical surface contact
Microscopically, when two surfaces come in contact, strong adhesive bond is formed at the tip of the asperities and consequently, adhesive wear particle is formed by shearing the interface caused by sliding. On the basis of JKR adhesion theory, dimensionless real area of contact and wear volume are computed numerically for multiasperity contact and It is found, their ratio is almost constant for different pair of MEMS surfaces. From which adhesive wear law is derived and accordingly, adhesive wear volume is the multiplication of real area of contact and rms roughness (sigma).
Adhesional friction law and adhesive wear law of micromechanical surface contact
The paper describes the investigation on adhesional friction law and adhesive wear law of micromechanical surface contact. Adhesion theory of loading force and friction force is incorporated in multiasperity contact to find out static coefficient of friction which supports Amontons's law of friction. New adhesive wear law is developed from almost linear relationship of dimensionless real area of contact and dimensionless adhesive wear volume, and it is compared with existing Archard's adhesive wear law.
Adhesive Wear Based on Accurate FEA Study of Asperity Contact and n-Point Asperity Model
International Journal of Surface Engineering and Interdisciplinary Materials Science, 2016
The paper describes a theoretical study of adhesive wear based on accurate finite element analysis (FEA) of elastic-plastic contact of single asperity and n-point asperity model. The wear model developed considers wear particle generation in whole range of deformation, ranging from fully elastic through elastic-plastic to fully plastic. Well defined adhesion index and plasticity index are used to study the prospective situations arising out of variation in load, material properties, and surface roughness. It is observed that the wear volume at particular level of separation increases with increase in plastic deformation and adhesion effect. Materials having higher tendency to adhesion show higher wear rate. Trend of the results obtained is found in line with the existing solutions which are modeled with conventional asperity concept. Inclusion of separate formulations for intermediate state of deformation of asperities which are based on accurate FEA study gives complete solution.
Adhesional friction theory of micromechanical surface contact
When two rough surfaces come in contact, tip of asperities would adhere and produces resistance as friction during sliding. First Bowden and Tabor has developed adhesional friction theory based on concept of cold welding of asperity tip through plastic deformation and flow. But this simple theory could not explain for adhesional friction of lightly loaded, clean and smooth hard metallic surface contact (Like MEMS) where asperities deform elastically. In this regard, an alternative adhesional friction theory is developed based on concept of cold welding of asperity through intermolecular adhesion at the area of contact considering JKR and SB adhesion theory of elastic solid sphere.
Asperity interaction in adhesive contact of metallic rough surfaces
Journal of Physics D: Applied Physics, 2005
The analysis of adhesive contact of metallic rough surfaces considering the effect of asperity interaction is the subject of this investigation. The micro-contact model of asperity interactions developed by Zhao and Chang (2001 Trans. ASME: J. Tribol. 123 857-64) is combined with the elastic plastic adhesive contact model developed by Chang et al (1988 Trans. ASME: J. Tribol. 110 50-6) to consider the asperity interaction and elastic-plastic deformation in the presence of surface forces simultaneously.
Adhesive impact of micromechanical surface contact
In this study, a new generalized adhesion theory of solid sphere is developed to investigate adhesive impact of head-disk surfaces. On the basis of this adhesion theory, deformation and restoration work done is evaluated for multiasperity adhesive impact of head-disk surfaces. From the plot of coefficient of restitution with mean separation, its found COR decreases gradually, with decrement of mean separation approaching to zero value which represents unique characteristic for head-disk impact. It indicates there is possibility of seizure of head-disk due to high adhesion at the interface for high impact.
Adhesive friction at the contact between rough surfaces using n-point asperity model
Engineering Science and Technology, an International Journal, 2015
The paper describes a theoretical study of adhesive friction at elasticeplastic contact of rough surfaces based on n-point asperity model. Well defined adhesion index and plasticity index are used to study the prospective situations arising out of variation in load, material properties, and surface roughness. Results are obtained for the behavior of friction force, applied load, and coefficient of friction for different combinations of adhesion index, plasticity index and mean separation of surfaces. The results obtained are in line with earlier models. It is observed that the tensile load required in maintaining a separation increases with increase in adhesion effect and extent of plastic deformation. Also coefficient of friction increases with adhesion effect.
International Frontier Science Letters, 2017
The present work considers analysis of adhesive friction of rough surfaces using n-point asperity concept for statistical definition of surface roughness features, and accurate finite element analysis of elastic-plastic deformation of single asperity contact. The paper describes theoretical study in which whole range of deformation of an n-point asperity viz. from fully elastic, through elastic-plastic, to fully plastic is considered and the intermediate transition regime is treated analytically as well as numerically. Well defined adhesion index and plasticity index are used to study the prospective contact situations arising out of variation in material properties and surface roughness features. Using practical values of material properties and surface roughness parameters, results are obtained for normally applied load, friction force, and coefficient of friction. It is observed that the surfaces undergoing predominantly plastic type of deformation and having moderate to higher a...
On the load-area relation in rough adhesive contacts
Tribology International, 2020
It is well established that, at small loads, a linear relation exists between contact area and reduced pressure for elastic bodies with non-adhesive rough surfaces. In the case of adhesive contacts, however, there is not yet a general consensus on whether or not linearity still holds. In this work evidence is provided, through numerical simulations, that the relation is non-linear. The simulations here presented can accurately describe contact between self-affine adhesive rough surfaces, since they rely on Green's function molecular dynamics to describe elastic deformation and on coupled phenomenological traction-separation laws for the interfacial interactions. The analysis is performed for two-dimensional compressible and incompressible bodies under plane strain conditions. Interfaces with various roughness parameters and work of adhesion are considered.
Temperature effects on adhesive wear in dry sliding contacts
Wear, 2010
Sliding wear Thermal effects Galling a b s t r a c t In many metal forming operations, frictional heating occurs at the interface due to a sliding contact. Generally, the controlling wear mechanism in the tribological system is attributed to adhesive wear. Understanding of the influence of temperature on wear mechanisms is needed for the development of materials and for optimization of the forming process. Dry sliding tests were conducted at different sliding velocities and, hence, different surface temperatures due to frictional heating. A significant influence of temperature on adhesion was observed and increasing temperature led to a higher tendency for initiation of severe adhesive wear. The results were compared to atomic force microscopy force curve measurements, which show that the adhesive force increases with temperature. A very good agreement between the results was observed, which suggests that the controlling mechanism for the observations in the present work is temperature-induced high adhesion.