The strong stiction of adjacent surfaces with meniscus is a major design concern in the devices with a micro-sized interface.Today,more and more research works are devoted to understand the adhesion mechanism.This pap...The strong stiction of adjacent surfaces with meniscus is a major design concern in the devices with a micro-sized interface.Today,more and more research works are devoted to understand the adhesion mechanism.This paper concerns the elastic-plastic adhesion of a fractal rough surface contacting with a perfectly wetted rigid plane.The topography of rough surface is modeled with a two-variable Weierstrass-Mandelbrot fractal function.The Laplace pressure is dealt with the Dugdale approximation.Then the adhesion model of the plastically deformed asperities with meniscus can be established with the fractal microcontact model.According to the plastic flow criterion,the elastic-plastic adhesion model of the contacting rough surfaces with meniscus can be solved by combining the Maugis-Dugdale(MD)model and its extension with the Morrow method.The necessity for considering the asperities'plastic deformation has been validated by comparing the simulation result of the presented model with that of the elastic adhesion model.The stiction mechanism of rough surfaces with meniscus is also discussed.展开更多
The adhesion of single asperity contacting with a rigid flat is investigated.The microcontact model of the deformable asperity is established utilizing fractal geometry,which makes the resuRed adhesion model to relate...The adhesion of single asperity contacting with a rigid flat is investigated.The microcontact model of the deformable asperity is established utilizing fractal geometry,which makes the resuRed adhesion model to relate with the surface characteristics that the asperity belongs to.The Dugdale approximation is utilized to consider the adhesive interaction within and outside the contact area.Then the model for solving the elastic-plastic adhesion of single asperity is presented by combing the Maugis-Dugdale(MD)model.To illustrate the necessity of considering the plastic deformation in microcontact,simulations of the relationship between the adhesive contact load and the interference of the asperity are performed.The result shows that the presented model is more suitable for the solution of the elastic-plastic microcontact of spherical asperity due to intermolecular adhesive interactions.展开更多
基金supported by China Post-doctor Science Foundation(Grant No.20070420748)Fujian Provincial Natural Science Foundation of China(Grant No.E0610032)
文摘The strong stiction of adjacent surfaces with meniscus is a major design concern in the devices with a micro-sized interface.Today,more and more research works are devoted to understand the adhesion mechanism.This paper concerns the elastic-plastic adhesion of a fractal rough surface contacting with a perfectly wetted rigid plane.The topography of rough surface is modeled with a two-variable Weierstrass-Mandelbrot fractal function.The Laplace pressure is dealt with the Dugdale approximation.Then the adhesion model of the plastically deformed asperities with meniscus can be established with the fractal microcontact model.According to the plastic flow criterion,the elastic-plastic adhesion model of the contacting rough surfaces with meniscus can be solved by combining the Maugis-Dugdale(MD)model and its extension with the Morrow method.The necessity for considering the asperities'plastic deformation has been validated by comparing the simulation result of the presented model with that of the elastic adhesion model.The stiction mechanism of rough surfaces with meniscus is also discussed.
基金China Post Doctor Science Foundation(No.20070420748)Fujian Provincial Natural Science Foundation of China(E0610032).
文摘The adhesion of single asperity contacting with a rigid flat is investigated.The microcontact model of the deformable asperity is established utilizing fractal geometry,which makes the resuRed adhesion model to relate with the surface characteristics that the asperity belongs to.The Dugdale approximation is utilized to consider the adhesive interaction within and outside the contact area.Then the model for solving the elastic-plastic adhesion of single asperity is presented by combing the Maugis-Dugdale(MD)model.To illustrate the necessity of considering the plastic deformation in microcontact,simulations of the relationship between the adhesive contact load and the interference of the asperity are performed.The result shows that the presented model is more suitable for the solution of the elastic-plastic microcontact of spherical asperity due to intermolecular adhesive interactions.
