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研究生:徐嘉彬
研究生(外文):HSU CHIA- BIN
論文名稱:表面粗度及外視接觸面積對極低負載不銹鋼接觸面摩擦係數之影響
論文名稱(外文):Effects of surface roughness and area on friction coefficient of stainless steel under light load
指導教授:蘇侃蘇侃引用關係
指導教授(外文):H. So
學位類別:碩士
校院名稱:國立臺灣大學
系所名稱:機械工程學研究所
學門:工程學門
學類:機械工程學類
論文種類:學術論文
論文出版年:2000
畢業學年度:88
語文別:中文
論文頁數:54
中文關鍵詞:黏著力摩擦力表面粗度面積極輕負荷
外文關鍵詞:adhesive forcefriction forcesurface roughnessareaultra-light loads
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在低速及一般負載下,兩個接觸表面的摩擦係數為定值,與接觸面積無關。稱為摩擦定律。
本文自行設計一台往復式摩擦試驗機,以往復滑動方式來探討低速及極輕負荷下,不同表面積及粗糙度對摩擦係數的影響。此外也量測不同表面積試片之結合力的大小,以及貼合時間對摩擦係數的影響。
由實驗結果得知,在極輕負荷下,中線平均值粗糙度Ra為0.04μm至0.09μm時,原子間的吸引力對摩擦產生影響,而造成試片表面積越大,摩擦係數越大,同時測出試片間的結合力與表面積大小成正比。但是因為表面吸附氣體及氧化膜存在,所以影響非常小。
當表面粗度Ra為0.04μm的試片貼合一段時間後,會因擴散的效應使吸附氣體及氧化膜的效用減低,而使金屬原子與金屬原子直接接觸,摩擦力因為吸引力影響而急速增大。而當表面粗度Ra大於0.07μm時則無影響。
In general , at low speeds, the friction coefficient of two contact surface is constant and independent of apparent contact area .
The purpose of this thesis experiment is to design a reciprocating friction test machine . By using this machine , we studied the influence of different surface areas , roughness , adhesion of different surface areas , and contact time on friction coefficient . Under the conditions of low sliding speeds and ultra-light loads.
The results show that under the circumstance of ultra-light , When the surface roughness ranged from 0.04μm to 0.09μm in Ra, attractive forces between the two contacting surfaces have influence on friction .The larger the surface area , the greater the friction coefficient . Meanwhile , We also find that the interfacial adhesive force is proportional to surface area . Due to the existence of absorbed air on surface and oxidation film , the effect is negligibly little .
When two specimens having a surface roughness of 0.04μm in Ra were put in contact for two hours, the friction of force increases with attractive force produced by direct contact of metallic atoms .When the surface roughness of the specimens is greater than 0.07μm in Ra, increase in friction of force is negligibly.
第一章 緒論
§1-1 研究動機 ………………………………………………..1
§1-2 相關文獻回顧 …………………………………………..1
§1-2-1 固體磨擦 ……………………………………………….1
§1-2-2 試片表面吸引力 ……………………….………………2
第二章 實驗之相關理論
§2-1 乾摩擦的摩擦機制 ……………………………………4
§2-2 固體表面結構與表面能…………………………………7
§2-3-1 邊界潤滑 ………………………………………………8
§2-3-2 物理吸附膜 ……………………………………………9
§2-3-3 金屬氧化膜 ……………………………………………9
第三章 實驗機構設計
§3-1 設計動機 ………………………………………………12
§3-2 各部構造 ………………………………………………12
§3-2-1 磨擦試驗機 ……………………………………………12
§3-2-2 吸引力量測機構 ………………………………………16
第四章 實驗條件與方法
§4-1 試片製作 ……………………………………………...17
§4-2 其他控制條件 ………………………………………...18
§4-3 實驗程序 ……………………………………………...20
第五章 實驗結果與討論
§5-1 實驗現象的觀察 ……………………………………….22
§5-2 試片貼合面積的估算 ………………………………….22
§5-3-1 試片表面粗度及面積大小對磨擦係數的影響 ……….23
§5-3-2 靜止時間對接觸面積的影響 ………………………….24
§5-3-3 貼合時間對磨擦係數的影響 ………………………….25
第六章 結論與建議
§6-1 結論 ……………………………………………………..29
§6-2 建議 ……………………………………………………..29
參考文獻 ………………………………………………………………31
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