Characterization of Circumferential Waves in Tubes with Laser Ultrasound Measurements and Theoretical Modeling

單層圓管環向導波之頻散行為量測與材料參數反算

葉承鴻(Cheng-Hung Yeh) ； 楊哲化(Che-Hua Yang)

《中華民國振動與噪音工程學會論文集》 2008 (2008/05) Pp. 99-101

https://doi.org/10.30028/CSSVANNUAL.200805.0099

摘要

核能電場中核子反應爐是主要的核心架構，為了顧及其安全性，在燃料二氧化鈾的保護層選用具有耐高溫、抗腐蝕及良好機械性質的鋯合金作為燃料丸的護套。氫化鋯具有氫脆的效果，造成材料破壞強度降低，輻射物質易污染循環水，必須停機進行更換。本研究利用雷射超音波技術量測鋯合金圓管環向與軸向導波的頻散關係，並建立其理論模型。研究結果指出，經實驗量測之頻散曲線皆與理論模型互相吻合。未來更可配合數值運算，反算圓管之材料參數。

關鍵字

雷射超音波 ； 鋯合金護套 ； 蘭姆波 ； 頻散關係 ； 環向導波

並列摘要

This research is focused on investigating the dispersion behaviors of guided waves (GW) propagating in Zircaloy cladding tubes. Theoretical models are used to model the dispersions of GW propagating along the circumferentail direction, and along the axial direction as well. It is found out that these two sets of dispersion are very close when the wall thickness is small, and show significant difference as the wall thickness increases. A laser ultrasound technique is used to measure the dispersions of GW propagating along the circumferential and axial directions. The theories are well supported by the measurements.

並列關鍵字

Laser ultrasound ； Zircaloy ； Lamb waves ； dispersion ； circumferential guided wave