裂紋發源 的英文怎麼說
中文拼音 [lièwénfāyuán]
裂紋發源
英文
crack initiation-
Keeping displacement constant, the length of dfz decreased. the less the lattice resistance is, the longer the dfz is. during the crack propagation, the pile - up dislocations may move forward in the previous direction or in another direction which caused shape of dfz changed. the dislocations emitted from the crack tip might pile up in the dfz and can be served as dislocation source in the successive loading
在裂紋擴展過程，反塞積位錯群發生變化，可以沿原來方向繼續向前運動，也可能改變運動方向使無位錯區的形狀發生變化，后來發射出的位錯可以在原五位錯區中塞積，並可作為位錯源在後續的加載中發射位錯。For successfully applying ae on detecting crack during fatigue test, noise restraining, signal locating and the building of ae features database has been deeply investigated in this thesis. in brief, the following are the primary contents : by analyzing the source of noise, several methods of restraining the noise are proposed : space filter, amplitude filter, bp filter, parameters filter, hit time setting and illustrate analysis
本文基於將聲發射技術應用到直升機部件疲勞裂紋檢測中，對噪聲的抑制、聲發射源定位的問題以及聲發射特性典型參數數據庫的構造進行了研究，主要工作如下： ?分析噪聲的來源，對如何抑制環境噪聲進行了研究。Abstract : a method was put forward for the detection of the fatigue cracks at the thread roots of a drill pipe by using ultrasonic wave. the specific detection probes were designed. simulated cracks were detected. the results show that the probes can effectively detect the cracks whose depth is more than 1mm and the detection errors of the depth and length of the cracks are less than 1mm and 3mm respectively
文摘:鉆桿螺紋根部疲勞裂紋是鉆桿鉆井服役中產生的常見缺陷類型，是鉆桿螺紋發生斷裂的重要根源.本文介紹了鉆桿螺紋疲勞裂紋超聲檢測原理，設計了專用超聲檢測探頭和檢測裝置，給出了檢測試驗結果，證明了鉆桿螺紋疲勞裂紋超聲檢測的可行性和實用性
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