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tribology behavior on scratch tests: Effects of yield strength

Friction 2017年第1期5卷 108-114页

作者： Biao FENG Theoretical Division Los Alamos National Laboratory Los Alamos New Mexico 87544 USA

A three-dimensional (3D) scratch model is proposed to investigate the effects of yield strength of both coatings and *** the help of combined Coulomb and plastic friction,the obtained results comprehensively interpret the experimental phenomena in most metals that with the growth of hardness after heat treatment the scratch friction coefficient (SFC) *** interpretation could not be done *** tests on the surface with or without the coating are *** the coating the SFC increases due to the decrease of the area with plastic slippage and/or the increase of friction stress during the increase of the yield strength in the *** a softer substrate the friction stress decreases but the SFC increases,which is caused by the growth of the entire contact area and surface ***,with a stronger substrate the SFC decreases due to an intensified plastic *** obtained results pave a new way to understanding the effects of yield strength on scratch tests,interpret experimental phenomena,and should be helpful for an optimum design in experiments.

关键词： tribology behavior yield strength coating scratch finite element method

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Surface Characterization and tribology behavior of PMMA Processed by Excimer Laser

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Chinese Journal of Mechanical Engineering 2023年第5期36卷 45-61页

作者： Dong Qin Juan Guo Ming Liang Ling Chen Weimin He Department of Ophthalmology West China HospitalSichuan UniversityChengdu 610000China Ophthalmology Department The Third People’s Hospital of ChengduChengdu 610031China

Polyoxymethylene methacrylate (PMMA) is widely used in ophthalmic biomaterials. Misuse of PMMA in extreme environments is likely to damage the ocular surface and intraocular structures. The surface characterization and tribological behavior of PMMA processed using an excimer laser were investigated in this study by contrasting diferent lubrication conditions and friction cycles. The results show that the roughness of the material surface increases with laser processing, which changes its physical structure. Under lubrication, the laser-treated PMMA exhibits better hydrophilicity, especially during the use of eye drops. No obvious relationship exists between the laser-processing time and friction behavior. However, the laser treatment may contribute to the formation of friction and wear mechanisms of PMMA materials. Laser-treated PMMA in saline solution exhibits better abrasive resistance by showing a lower wear rate than that in eye drops, although it has a higher friction coefcient. In this study, the diferent friction stages in laser-treated PMMA were clarifed under two lubrication conditions. The wear rates of the laser-treated PMMA were found to decrease with the number of cycles, and the friction coefcient has a similar variation tendency. The wear behavior of the laser-treated PMMA is dominated by the main abrasive wear and secondary transferred flm formation. This study provides a theoretical basis for the development and application of ophthalmic biomaterials in complex environments by examining the material surface interface behavior and wear mechanism after laser processing using PMMA as the research matrix.

关键词： Biocompatible materials Poly(methyl methacrylate) Surface characterization tribology behavior

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