SA533B1壓力槽鋼材之疲勞裂縫閉合與裂縫成長研究

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陳奎澧(KweiLi Chen ) 查詢紙本館藏

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論文名稱

SA533B1壓力槽鋼材之疲勞裂縫閉合與裂縫成長研究

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摘要(中)

本文採用ABAQUS有限元素分析軟體，建立有限元素分析模型，預測SA533B1鋼材之疲勞裂縫行為。研究內容分兩大部分，一為全穿透裂縫之裂縫閉合效應，另一為表面裂縫之疲勞裂縫成長。全穿透裂縫分析使用彈塑性模型，研究疲勞負荷範圍、應力比及超載負荷對於裂縫閉合參數Kop的影響，並與實驗結果相比較；由分析結果得知SA533B1鋼材的裂縫開口應力強度因子Kop，隨著應力強度因子範圍ΔK的增加有上升趨勢，此現象與實驗結果相符合。負荷的應力比越大，則裂縫開口應力強度因子Kop越大，但應力比大於0.2之後，Kmin已經高於Kop，因此裂縫閉合現象消失。表面裂縫分析使用線彈簧模型，求取應力強度因子K及探討裂縫成長，其結果顯示本文的線彈簧模型與已發表的文獻相差10~20 %，而由線彈簧模型所預測表面裂縫的成長及其外型變化與實驗結果相近。

關鍵字(中)

★ 全穿透裂縫
★ 反應爐壓力槽
★ 疲勞裂縫
★ 表面裂縫
★ 裂縫閉合

關鍵字(英)

★ Crack Closure
★ Reactor Pressure Vessel
★ RPV

論文目次

總目錄
摘要...................................................I
誌謝..................................................II
總目錄...............................................III
圖目錄.................................................V
表目錄.................................................VIII
符號說明..............................................IX
壹、緒論................................................1
1.1前言.................................................1
1.2文獻回顧.............................................3
1.2.1 模擬線彈性材料裂縫成長策略.......................3
1.2.2 模擬彈塑性材料裂縫成長策略.......................4
貳、理論說明..............................................6
2.1 線彈性破壞力學（Linear Elastic Fracture Mechanics）...6
2.1.1線彈性破壞力學簡介................................6
2.1.2有限元素法中之特殊裂縫尖端元素.....................7
2.2 J-積分.............................................12
2.3 疲勞裂縫成長.........................................13
2.4 疲勞裂縫閉合.........................................14
2.5 表面裂縫之應力強度因子................................16
2.5.1 Newman及Raju解..................................16
2.5.2三維有限元素解....................................18
2.5.3線彈簧元素解.....................................19
參、有限元素分析與實驗方法.................................20
3.1有限元素法模擬........................................20
3.2 實驗方法.............................................24
3.2.1材料及試片..........................................24
3.2.2疲勞裂縫成長及裂縫閉合量測........................24
肆、結果與討論............................................26
4.1全穿透裂縫之裂縫閉合效應...............................26
4.1.1 殘留塑性區及裂縫閉合應力.........................26
4.1.2 應力強度因子範圍之影響...........................28
4.1.3 裂縫位置之影響...................................28
4.1.4 應力比之影響.....................................28
4.1.5 負荷型態之影響...................................29
4.2表面裂縫之裂縫閉合效應.................................30
4.2.1應力強度因子計算與驗證.............................30
4.2.2表面裂縫成長.....................................31
伍、結論..................................................32
陸、未來研究方向..........................................33
參考文獻..................................................34

參考文獻

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指導教授

黃俊仁(Jiun-ren Hwang)

審核日期

2001-7-18

推文