臺灣博碩士論文加值系統

超音波檢測可檢測結構內部和表面缺陷如裂縫、空孔等，為應用最廣的非破壞檢測方法，然在實驗室欲以人工方法製成真實裂縫不僅過程複雜困難失敗率亦相當高。本文以線割放電加工方法製成有限寬度的人工溝槽取代真實裂縫，探討不同方法裂縫深度量測的優劣。實驗方法為將不同深度的試塊，以不同頻率及入射角量測裂縫深度，比較這些參數對量測裂縫深度的影響及準確度，最後就各種量測方法的準確度及限制做綜合比較與評估。實驗結果可做為有效量測結構裂縫深度的參考，同時亦可在無法製作真實裂縫以人工溝槽取代時，提供比較類比的參考數據。

The capability of detecting defects inside the structures and on the surface such as cracks and voids, make the ultrasonics become the most common use of non-destructive examination technique. It is always difficulty to fabricate a real crack in the laboratory. Present investigation uses a finite width of artificial slot made by electrical discharge machining, to simulate the real crack. Five different methods of measuring the depth of surface crack are presented. The effects of frequency and incident angle on the measurement accuracy for these five methods are evaluated. Comparisons are made among those methods to examine their advantages and disadvantages. The results can provide useful information to determine the best way of detecting defects.

中文摘要
英文摘要
致謝
目錄
表目錄
圖目錄
一、 緒論
1.1 前言
1.2 研究動機
1.3 文獻回顧
1.4 研究目的及方法
二、 波之物理現象
2.1 波動原理及波式
2.2 波的反射、折射、及波式轉換
2.3 彈性波在裂縫與溝槽尖端之繞射現象
三、 超音波檢測實驗
3.1 真實裂縫之製造及困難
3.2 人工溝槽之製作
3.3 表面裂縫深度量測方法
四、 實驗結果與討論
4.1 衛星脈波觀察法
4.2 衛星脈波檢測法
4.3 橫波繞射法
4.4 表面波法
4.5 頻譜分析法(FFT)
4.6不同量測方法之比較
五、結論
附錄一
附錄二
附錄三
參考文獻
簡歷

1. Silk, M. D. “Sizing Crack-like Defects by Ultrasonic Wave.” Proc.First Intern. Symp. Ultrasonic Materials Characterization 1978 (1980)
pp.29-36.
2. Lloyd, E. A. “An Ultrasonic Shear-Wave Method for Measuring the Depth of Surface-Breaking Cracks.” Brit. J. NDT (1975), pp.172-175.
3. Mak, D. K. “Ultrasonic Methods for Measuring Crack Location Crack Height and Crack Angle.” Ultrasonic, 1985, pp.223-226.
4. Hayman, A. J. “An Improved Ultrasonic Tip-Corner Timing Method for Sizing Shallow Surface-Breaking Cracks.” Brit. J. NDT (1985)pp.295-299
5. Gruber, G. J. “Defect Identification and Sizing by the UltrasonicSatellite-Pulse Technique.” Journal of Nondestructive Evaluation Vol.1 (4), 1980, pp.263-276.
6. Lidington, B. H. and Silk, M. G. “Crack Depth Measurement Using a Single Surface Wave Probe.” Brit. J. NDT (1975), pp.165-167.
7. Hudgell, R. J. and Lumb, R. F. “Non-Destructive Measurement of Depth of Surface-Breaking Cracks Using Ultrasonic Rayleigh Waves.”Brit. J. NDT (1974), pp.144-149.
8. Domarkas, V. ; Khuri Yakub, B. T. and Kino, G. S. “Length and DepthResonances of Surface Cracks and Their Use for Crack Size Estimation.”Appl. Phys. Lett., Vol. 33(7), 1978, pp.557-559
9.Simpson Jr, W. A. “Time-Frequency-Domain Formulation of UltrasonicFrequency Analysis.” J. Acoust. Soc. Am., Vol. 56(6), 1974, pp.1776-1781.
10. Whaley, H. L. ; Cook, K. V. and McClung, R. W. “Application of Frequency Analysis in Ultrasonic Testing.” Materials Evaluation, 1975pp.19-24.
11. Gilmora, R. S. and Czerw, G. J. “The Use of Radiation Field Theory toDetermine the Size and Shape of Unknown Reflectors by UltrasonicSpectroscopy.” Materials Evaluation, 1977, pp.44-50.
12. Laszlo Adler ; Cook, K. V. ; Whaley, H. L. and McClung, R. W.“Flaw-Size Measurement in A Weld Sample by Ultrasonic Frequency Analysis.” Materials Evaluation, 1977, pp.44-50.
13. Aduda, B. O. and Rawlings, R. D. “Spectral Analysis of Acousto- Ultrasonic Waves for Decfect Sizing.” NDT Intern., Vol. 94(4), 1996pp.237-240.
14. 吳學文、黃啟貞、陳必貫、葉競榮合編, “超音波檢測法(初級)”,
中華民國非破壞檢測協會出版
15. 葉競榮、徐鴻發合編, “超音波檢測法(中級)”, 中華民國非破壞檢測協會出版
16. Date, K. ; Shimada, H. and Ikenaga, N. “Crack Height Measurement — An Evaluation of the Accuracy of Ultrasonic Timing Methods.” NDT Intern., 1982, pp.315-319.
17. Lidington, B. H. ; Saunderson, B. H. and Silk, M. G. “Interference Effectsin the Reflection of Ultrasound From Shallow Slits.” Non-Destructive Testing, 1975, pp.185-190.
18. Giulio DiGiacomo ; Crisci, J. R. and Solomon Goldspiel “An Ultrasonic Method for Measuring Crack Depth in Structural Weldments.” MaterialsEvaluation, 1970, pp.189-193.
19. Silk, M. G. “Changes in Ultrasonic Defect Location and Sizing.” NDT Intern., Vol. 20(1), 1987, pp.9-14.
20. Silk, M. G. “Defect Dtection and Sizing in Metals Using Ultrasound.” Intern. Metals Reviews, 1982, pp.28-50.
21. Silk, M. G. “The Transfer of Ultrasonic Energy in the Diffraction Technique for Crack Sizing.” Ultrasonic, 1979, pp.113-121.
22. Silk, M. G. “Defect Sizing Using Ultrasonic Diffraction.” Brit. J. NDT1979, pp.12-15.
23. Silk, M. G. and Lidington, B. H. “An Evaluation of Single Probe Bulk-Wave Time-Delay Techniques in Sizing Crack in Steel.” NDT Intern.,1977, pp.129-134.
24. Whaley, H. L. and Laszlo Alder “Flaw Characterization by Ultrasonic Frequency Analysis.” Materials Evaluation, 1971, pp.182-188.
25. 黃茂坤編著, “工業超音波檢測實物彙編”, 中船公司高雄總廠訓
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