- 學位論文
表面球狀與橢圓狀波峰界面增長之實驗與應用
Experiment and Application of Junction Growth on Surface Peak of Spherical and Ellipsoid
摘要
靜態微接觸理論之發展已促成大家對機械界面間特徵有進一步之了解，並且也解決機件現今之表面與界面問題，然而在靜態與動態上，微接觸特性卻有相當之差別，動態微接觸特徵的了解將更能夠讓我們準確地預測界面性能。 本研究使用光學量測方法進行起動界面實驗，觀測半圓體及半橢圓體之紅銅金屬於堅硬之石英玻璃平坦面上，先行施加正向預負荷，再施予一滑動負荷後使紅銅試件在平面上產生滑動，並分別探討不同尺寸及形狀之粗糙峰承受於各種不同之正向負荷與滑動速度後，接觸界面面積增長大小及幾何形狀變化，以進一步了解摩擦力在兩個不同接觸界面特性的影響。 實驗結果顯示，當相互接觸之兩物體產生滑動時，其界面增長與壓縮變形趨勢皆為非線性，大部分界面增長與壓縮變形都發生於滑動初始階段。界面增長與壓縮變形量都與正向負荷、滑動速度成正向關係，因此界面增長與壓縮變異量有極大的相關性。摩擦係數與正向負荷呈現反向關係，並且滑動速度越快，摩擦係數越大。但是在曲率半徑不變的情況下，滑動角度與橢圓率的變化對摩擦係數影響不大。所以摩擦係數跟曲率半徑和正向負荷有很大的關係。界面增長除了曲率半徑和正向負荷兩個參數之外，還有滑動距離與滑動速度有關係。
並列摘要
Static micro-contact theory then has led to the development of the mechanical characteristics of further the understanding in the University. and also to solve parts of the surface and interface problems. but in static and dynamic are considerable micro-contact characteristics of the different. dynamic micro-contact understanding of micro-contact feature allows us to more accurately predict the interface properties. This study used optical measurement to observe the hemispherical and semi-elliptical cooper metals with soft and tough properties, putting on hard and flat quartz glass. After applied normal per-load and tangential load, the cooper metals would slid on the platform, then explored the deformations of contact areas and geometric shapes after the asperity with various sizes and shapes applied various positive and sliding rate, and to realize the effects between adhesion, friction, and wear to the properties of two contact surface. The results of experiment show that when the two contact objects start to slide, the interface growth, compression, and deformation are all nonlinear, these trends always generate at initial sliding stage; otherwise, the interface growth, compression, and deformation are all proportional to forward load and sliding speed, but inverse proportional to radius of curvature and ellipticity.Friction with the positive load the is proportional, but friction coefficient with the positive load the is inversely proportional, so positive load increase and friction changes is not as geometric. Regardless of the sliding speed changes, the static friction coefficient of maximum occurs the distance of 200μm to 300μm. Slip angle changes and the ellipticity change to regarding coefficient of friction and interface junction growth has not greatly affected.