反應爐壓力槽管嘴在暫態負荷下之熱應力與疲勞行為研究

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姓名

陳宗志(Tsung-chih Chen) 查詢紙本館藏

畢業系所

機械工程學系

論文名稱

反應爐壓力槽管嘴在暫態負荷下之熱應力與疲勞行為研究

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摘要(中)

核能電廠中的核能一級組件在運轉期間，會受到來自壓力及溫度等各項循環暫態負載，且循環負載的大小及發生次數會影響組件的疲勞使用壽命，組件的疲勞使用壽命一直是設計者關注的議題。雖然在設計組件時已考慮到疲勞使用壽命，但安裝完成且開始運轉後，實際上所受到的循環負荷大小和設計值並不相同。
本研究以核電廠的反應爐水淨化取水管線(Reactor Water Clean Up Outlet Nozzle, RWCU)作為分析對象，考慮不同設計負荷條件組合，採用有限元素分析軟體(ANSYS)進行分析，搭配ASME NB-3200的規範求取組件易損耗處的應力值，並計算出累積使用因子，結果顯示這些易損耗處在此設計負荷下之累積使用因子小於1，皆屬於安全範圍之內。
除此之外，本研究亦探討格林函數在計算熱應力之實用性，結果顯示當結構材料特性為定值時，格林函數計算出的熱應力歷程與FEM的結果相當吻合。

摘要(英)

The class 1 nuclear components are subjected to transient load like pressure and temperature during operation. The cycle number and magnitude of service load may affect the fatigue life of components and that is an important issue to engineering applications. Although the fatigue life of nuclear components had been evaluated in the design stage, the actual transient loads that components subjected to are not the same as the design transient loads.
In this study, the Reactor Water Clean Up (RWCU) outlet nozzle of reactor pressure vessel is evaluated. The critical stress value of this component is calculated under combination of different design load conditions by finite element method. Then according to ASME NB-3200 specification, the cumulative usage factor is calculated. The result shows that the maximum cumulative usage factor of the evaluated critical locations are much less than permissible value, 1. In addition, this study also investigates the practicality of Green’s function in thermal stress calculation. The result shows that when material properties are constant, the thermal stress history is in good agreement with that of the finite element method.

關鍵字(中)

★ 暫態負載
★ 累計使用因子
★ 格林函數
★ 熱應力

關鍵字(英)

★ Transient Loads
★ Cumulative Usage Factor
★ Green Function
★ Thermal Stress

論文目次

目錄
摘要 i
Abstract ii
誌謝 iii
目錄 iv
圖目錄 vi
表目錄 viii
符號說明 x
第一章緒論 1
1-1研究動機 1
1-2研究目的 2
1-3文獻回顧 3
1-3-1有限元素 3
1-3-2 疲勞分析 3
1-3-3 格林函數 4
第二章理論說明 5
2-1 ASME Boiler and Pressure Vessel Code 5
2-2有限元素理論 5
2-3格林函數[15, 17, 18] 7
2-4疲勞分析理論 11
2-4-1疲勞壽命估算法 11
2-4-2應力-壽命曲線(S-N Curve)[19, 20] 12
2-4-3循環計數 13
2-4-4疲勞累積損傷理論 15
2-4-5破壞理論 16
2-5 ASME壓力容器應力與疲勞分析 17
2-5-1應力簡述 17
2-5-2疲勞分析 20
2-5-3配對法 21
第三章研究方法 23
3-1 ANSYS設定 23
3-1-1前處理器(Pre-processor) 23
3-1-2分析計算(Solution)模組 30
3-2格林函數 46
第四章結果與討論 50
4-1組件應力與疲勞行為 50
4-1-1 Level A & B運轉模式下之應力 50
4-1-2累積疲勞因子 54
4-2格林函數 59
4-2-1格林函數曲線求取 59
第五章結論與未來研究方向 64
5-1結論 64
5-2未來研究方向 65
參考文獻 66

參考文獻

參考文獻
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指導教授

黃俊仁

審核日期

2015-7-28

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