The coiled tubing fatigue belongs to overlow cycle fatigue at multi-axial stress state.The prediction theory of this field is far from comp lete. 而連續油管的疲勞是應力狀態(tài)較復雜的多軸超低循環(huán)疲勞，目前該疲勞壽命預測理論還很不成熟。
Based on the ultrasonic guided wave technique and the dispersive waveform prediction method, a method about how to image defects in pipes is presented. 摘要在導波傳播理論和頻散波形預測理論的基礎上，研究了超聲導波在檢測管道時(shí)，如何利用時(shí)域波形重構缺陷圖像的問(wèn)題。
