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姓名 李耀宗(Yaw-Tzoung Lee)  查詢紙本館藏   畢業系所 機械工程學系
論文名稱 藥柱低週疲勞特性與壽限評估模式之研究
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摘要(中) 本研究探討固體藥柱之低週疲勞性質,以及建立低週疲勞壽限評估方式。除了進行等應變振幅疲勞試驗外,還利用等效之掛載振動頻譜在不同應變水準下進行變動振幅疲勞試驗,以求取疲勞壽限值。在低週疲勞壽限分析中,探討平均應力修正模式及循環計數法之影響,以了解適用於藥柱之低週疲勞壽限評估模式。
本研究求得藥柱之循環應力-應變方程式及應變-壽命方程式。且由研究結果得知當藥柱在掛載頻譜負荷下,以Morrow平均應力修正法搭配雨流區間法進行疲勞壽限分析,可得最佳結果,但若能再加計潛變損傷之影響則更佳。由試件之破斷面觀察發現到,在等應變振幅條件下主要以剝落方式造成損壞,而在變動應變振幅條件則以劈裂方式發生。
摘要(英) This thesis investigates low cycle fatigue properties and fatigue life prediction model of solid propellant. In addition to the constant strain amplitude fatigue test, the spectrum fatigue test of solid propellant was performed. The present fatigue life prediction model is strain based. Effects of strain ratio (R) and cycle counting method on the predicted life were studied.
The author obtains the cyclic stress-strain equation and strain-life equation of solid propellant in this study. When the solid propellant under spectrum loading, the best fatigue life prediction model is the strain-life model combined Morrow mean stress correction with rainflow histogram cycle counting method. From the analysis of fractographs, it is seen that many solid grains peel off the matrix on facture surface in R= -1 spectrum fatigue test. While the fracture mechanism changes into split in R = 0.5 spectrum fatigue.
關鍵字(中) ★ 壽限預估
★ 固體藥柱
★ 頻譜負荷
★ 平均應力
★ 疲勞
關鍵字(英) ★ mean stress
★ solid propellant
★ fatigue
★ life prediction
★ spectrum loading
論文目次 總目錄
摘要 I
Abstract II
誌謝 III
總目錄 IV
符號說明 VII
圖目錄 IX
表目錄 XII
第一章 緒論 1
1-1 研究動機與目的 1
1-2 研究內容 2
1-3 研究架構 2
1-4 文獻回顧 5
1-4-1 藥柱相關研究 5
1-4-2 疲勞相關研究 9
第二章 理論說明 14
2-1 應變-疲勞壽限法 14
2-2 循環計數 16
2-3 平均應力修正 20
2-4 次序效應修正 21
2-5 損傷累計 25
第三章 研究方法 26
3-1 等應變振幅疲勞試驗 26
3-1-1 實驗設備 26
3-1-2 夾治具設計與試片製作 28
3-1-3 試驗規劃 32
3-2 變動應變振幅疲勞試驗 34
3-2-1 實驗設備 34
3-2-2 夾治具設計與試片製作 34
3-2-3 實驗規劃 35
3-3 破斷面觀察 40
第四章 結果與討論 41
4-1 等應變振幅疲勞試驗結果 41
4-2 變動應變振幅疲勞試驗結果 46
4-2-1循環計數法之影響 46
4-2-2 平均應力修正模式之影響 46
4-3 破斷面觀察 53
第五章 結論與未來發展 57
參考文獻 58
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指導教授 黃俊仁(Jiun-Ren, Hwang) 審核日期 2006-7-18
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