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http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/45208完整後設資料紀錄
| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.advisor | 單秋成 | |
| dc.contributor.author | Tu-Chih Liu | en |
| dc.contributor.author | 劉圖智 | zh_TW |
| dc.date.accessioned | 2021-06-15T04:08:55Z | - |
| dc.date.available | 2012-08-19 | |
| dc.date.copyright | 2011-08-19 | |
| dc.date.issued | 2011 | |
| dc.date.submitted | 2011-08-17 | |
| dc.identifier.citation | [1] 林士瑋, “利用微型平板試片探討疲勞性質,” 碩士論文, 台灣大學機械工程研究所, 2008.
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Mech.,” 64,pp.607-624, 1999. [41] 林毓書, “腐蝕對2024鋁合金之機械性質影響,” 碩士論文, 國立台灣大學機械工程研究所, 2010. [42] 楊博昌, “4340合金鋼受高峰應力下之疲勞裂縫生長現象,” 碩士論文, 台灣大學機械工程研究所, 1991. [43] 徐森煌, “304不鏽鋼疲勞裂縫之減速現象,” 碩士論文, 台灣大學機械工程研究所, 1991. [44] “Standard Test Method for Plane Strain Fracture toughness of Metallic Materials,” ASTM E399-83. [45] J.W. Dally,W.F. Riley,“Experimental Stress Analysis,” Third Edition, pp.97–100, 1999. [46] L.P. Pook, “The Effect of Friction on Pin Jointed Single Edge Notch Fracture Toughness Test Specimens,” International Journal of Fracture Mechanics, Vol. 4, pp.295–297, 1968. [47] Harris, “Stress Intensity Factors for Hollow Circumferentially Notched Round Bars, ” Journal of Basic Engineering, pp.49–54, 1967. [48] P.E. Irving, J.L. Robinson, and C.J. Beevers, “Fatigue Crack Closure in Titanium and Titanium Alloy,” International Journal of Fracture, Vol.9, pp.105-108, 1993. [49] O. Buck, C.L. Ho, and H.L. 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| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/45208 | - |
| dc.description.abstract | 傳統疲勞實驗使用大型的材料試驗機以及標準試片，使得進行一次實驗必須花費較多的成本與時間。利用微型平板試片進行疲勞試驗，比標準試片節省材料與製作成本，改採取微型疲勞試驗機來取代大型材料試驗機，更能藉著其高拉伸頻率來縮短疲勞試驗的時間。
本文以AISI 4340合金鋼和304不鏽鋼為實驗材料，研究微型疲勞試驗機以及微型平板試片應用於觀察高峰負載減速現象之可行性。實驗中，將AISI 4340合金鋼以及304不鏽鋼兩種材料製成微型平板試片，進行高峰負載疲勞實驗，並比較微型平板試片與標準疲勞試片所反映出數據結果之異同。 實驗結果說明微型平板試片於高峰負載後可以發現明顯之減速現象以及減速區，兩種材料減速模式皆和標準疲勞試片之實驗結果相同。配合裂縫封閉之量測，能有效估算其高峰負載施加前之裂縫生長速度。 | zh_TW |
| dc.description.abstract | Conventional fatigue test was conducted by MTS (material test system) with standard CT specimens, it would be time and cost consuming. Using miniature specimens could save material and cost ,and the high working frequency of miniature fatigue test system could save much time during fatigue testing.
The experiment materials of this study were AISI 4340 steel alloy, and 304 stainless steel. We prepared miniature fatigue specimens to observe the phenomenon of fatigue crack propagation following an tensile overload. Finally, we discussed the usage and practicability of miniature fatigue specimen testing by comparing the results between standard CT specimens and miniature specimens. After experiments, we can find out the overload retardation phenomenon obviously and retardation modes of the two experiment materials are the same with the results of standard CT specimens. We can also predict the fatigue crack growth rate effectively before applying overload by considering the crack closure. | en |
| dc.description.provenance | Made available in DSpace on 2021-06-15T04:08:55Z (GMT). No. of bitstreams: 1 ntu-100-R98522502-1.pdf: 3437703 bytes, checksum: 72fb403ce8285dd407767f7b19f21165 (MD5) Previous issue date: 2011 | en |
| dc.description.tableofcontents | 口試委員審定書 i
誌謝 ii 摘要 iii Abstract iv 目錄 v 圖目錄 vii 表目錄 x 第一章 緒論 1 1.1 前言 1 1.2 研究動機 1 1.3 論文架構 2 第二章 文獻回顧 3 2.1 疲勞裂縫生長相關文獻 3 2.1.1 應力強度因子 3 2.1.2 Paris Law 4 2.1.3裂縫封閉效應 5 2.1.4 Elber修正式 6 2.2 高峰應力的減速機制 7 2.3 縮小試片尺寸的技術 10 2.3.1 小尺寸試片之發展 10 2.3.2 小尺寸試片疲勞測試 11 第三章 實驗工具與程序 19 3.1 摘要 19 3.2 實驗材料與規格 19 3.2.1 材料性質 19 3.2.2 試片尺寸及加工方式 20 3.2.3 微型平板試片應力強度因子幅 21 3.3 實驗設備簡介 22 3.4 微型平板試片裂縫封閉量測 23 3.5 實驗程序與參數 27 3.5.1 試片準備及架設 27 3.5.2 實驗參數及負載模式 28 第四章 實驗結果與討論 45 4.1 微型平板試片之高峰負載疲勞實驗結果 45 4.1.1 高峰負載後裂縫生長速度之變化情形 45 4.1.2 應力有效強度比U值之變化情形 47 4.1.3 裂縫成長速率與有效強度比U值之關係 49 4.1.4 微型平板試片SEM斷面觀察結果 52 4.2 與CT試片之比較 52 4.2.1 應力狀態討論 52 4.2.2 減速現象之比較 53 第五章 結論與未來展望 84 5.1 結論 84 5.2 未來展望 85 參考文獻 86 | |
| dc.language.iso | zh-TW | |
| dc.subject | 高峰拉伸應力減速 | zh_TW |
| dc.subject | 疲勞性質試驗 | zh_TW |
| dc.subject | 微型平板試片 | zh_TW |
| dc.subject | 疲勞裂縫生長 | zh_TW |
| dc.subject | 裂縫封閉效應 | zh_TW |
| dc.subject | fatigue crack growth | en |
| dc.subject | overload retardation | en |
| dc.subject | crack closure | en |
| dc.subject | fatigue | en |
| dc.subject | miniature specimens | en |
| dc.title | 微型平板試片之高峰負載減速現象 | zh_TW |
| dc.title | The Overload Retardation Phenomenon of Miniature Specimens | en |
| dc.type | Thesis | |
| dc.date.schoolyear | 99-2 | |
| dc.description.degree | 碩士 | |
| dc.contributor.oralexamcommittee | 黃庭彬,莊禮彰 | |
| dc.subject.keyword | 疲勞性質試驗,微型平板試片,疲勞裂縫生長,裂縫封閉效應,高峰拉伸應力減速, | zh_TW |
| dc.subject.keyword | fatigue,miniature specimens,fatigue crack growth,crack closure,overload retardation, | en |
| dc.relation.page | 89 | |
| dc.rights.note | 有償授權 | |
| dc.date.accepted | 2011-08-17 | |
| dc.contributor.author-college | 工學院 | zh_TW |
| dc.contributor.author-dept | 機械工程學研究所 | zh_TW |
| 顯示於系所單位： | 機械工程學系 | |
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