研究生: |
李文傑 Wun-jie Li |
---|---|
論文名稱: |
3Y氧化鋯薄板之單軸向拉壓負載 Uniaxial Tensile-Compressive Loadings on 3Y-ZrO2 Thin Plates |
指導教授: |
劉見賢
Chien-hsien Liu |
口試委員: |
呂森林
none 黃聰耀 none |
學位類別: |
碩士 Master |
系所名稱: |
工程學院 - 機械工程系 Department of Mechanical Engineering |
論文出版年: | 2009 |
畢業學年度: | 97 |
語文別: | 中文 |
論文頁數: | 83 |
中文關鍵詞: | 氧化鋯 、晶域重排 、相變化 |
外文關鍵詞: | Zirconia, domain reoientation, phase transformation |
相關次數: | 點閱:182 下載:7 |
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本實驗中針對骨頭狀外型且可以承受平面應力負載之薄型3Y-氧化鋯試片進行單軸向拉應力循環負載與壓-拉應力交互循環負載之實驗,研究材料在這兩種應力負載狀態下的各種韌化機制發生之時機與強度。記錄應力、軸向應變與側向應變增量來計算即時體積模數、即時波松比值和即時楊氏模數。然後將這些即時的機械性質與線彈性變形下的機械性質相互比較,並且分析各種非彈性變形行為是由於何種韌化機制所造成如相變化與晶域重排以及其強度。
結果顯示材料在承受壓-拉應力負載過程中,應力應變曲線迴路位置變化大,表示有明顯的相變化發生。其結果相較於單純執行拉伸應力循環或壓縮應力循環實驗所產生的非彈性變形行為還要強烈,是以相變化為主的韌化機制。
The specimens are in the form of a thin plate and subjected to a plane stress loading. The timing and intensity of any kind of toughening mechanisms have been observed when the specimen is subjected to the tensile-compressive or simple tension cyclic loadings. Instantaneous bulk modulus, instantaneous Poisson’s ratio and instantaneous Young’s modulus are derived from the recorded stress-strain curves. Then those instantaneous mechanical properties are compared with those in linear elastic deformation to analyze the occurring intensity of various kind of inelastic deformation, such as phase transformation and domain reorientation.
It has been shown that substantial inelastic deformation, especially phase transformation and its reverse deformation, occurs in the alternating tensile-compressive loadings. The intensity of this kind of toughening mechanism in this alternating loading is much higher than that in pure tension or compression.
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