臺灣博碩士論文加值系統

本文針對單向對稱等振幅應力循環下之棘齒行為進行研究，主要針對鋁7075之材料於單向對稱等振幅循環下所出現之棘齒行為進行分析與探討其產生原因，並根據文獻上所提及之現象提出一合理的解釋看法，並設計實驗探討棘齒行為產生之時點受何種因素影響，以利將來組成律上的研究。
根據一連串實驗分析結果的顯示，鋁7075和鋁6061於單向對稱等振幅循環下皆有拉壓硬化不對稱之現象，因此當其循環硬化趨於飽和時，每一圈應力循環下總是會產生拉伸向的應變累積，即是我們所認知的棘齒行為。進一步的探討此類棘齒行為，發現於應力控制路徑上的不同（先拉或先壓以及振幅由小到大）將會影響棘齒產生的先後，但對於棘齒之累積上卻無實質上的影響。

目錄
誌謝…………………………………………………………………… 一
摘要…………………………………………………………………… 三 目錄…………………………………………………………………… 四
表目錄………………………………………………………………… 八
圖目錄………………………………………………………………… 九
第一章 導論 1
1.1 前言 1
1.2 文獻回顧 3
1.3 研究範圍 9
第二章 實驗設備 11
2.1 實驗材料及試棒 11
2.1.1 材料名稱及特性 11
2.1.2 試棒尺寸與性質 11
2.2 實驗設備 13
2.2.1 硬體設備 13
2.2.2 軟體設備 15
2.3 實驗程序 16
2.4 結語 19
第三章 單向對稱應力循環下之棘齒行為 20
3.1 前言 20
3.2 循環硬化與棘齒行為 21
3.2.1 循環硬化 21
3.2.2 棘齒行為 22
3.3 軸向對稱等振幅應力循環實驗 22
3.3.1 先壓且振幅為165MPa（圖3.1） 22
3.3.2 先拉且振幅為185MPa（圖3.2） 23
3.3.3 先壓且振幅為185MPa（圖3.3） 23
3.3.4 先拉且振幅為195MPa（圖3.4） 24
3.3.5 先壓且振幅為165-185-195MPa三階段（圖3.5） 24
3.3.6 先拉且振幅為230-250MPa兩階段（圖3.6） 25
3.3.7 先拉且振幅為250-230MPa兩階段（圖3.7） 26
3.4 扭向對稱等振幅剪切應力循環實驗 27
3.4.1 振幅為75MPa(圖3.8) 27
3.4.2 振幅為75-80MPa兩階段(圖3.9) 27
3.5 對稱應力循環下發生棘齒之可能機制 28
3.6 單一階段等振幅循環實驗下之棘齒現象分析 28
3.6.1 循環硬化之影響 29
3.6.2 拉壓硬化不對稱 30
3.6.3 結語 33
3.7 多階段等振幅循環實驗下之棘齒現象分析 34
3.7.1 鋁7075 35
3.7.2 鋁6061 37
3.7.3 結語 38
第四章 單向等振幅應力循環下棘齒行為進一步探討 41
4.1 棘齒行為驗證實驗 41
4.1.1 對稱等振幅165MPa循環實驗 41
4.1.2 結語 42
4.2 相角相差180度之控制路徑對棘齒行為之影響 43
4.2.1 實驗觀察 43
4.2.2 探討原因 44
4.2.3 結語 48
4.3 拉壓面積的影響 48
4.4 非對稱等振幅應力循環下之棘齒行為 50
第五章 結論與建議 53
5.1 結論 53
5.2 建議 54
參考文獻 56
附表…………………………………………………………………… 61
附圖…………………………………………………………………… 69
附錄一…………………………………………………………………120
附錄二…………………………………………………………………124

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