(裝甲兵工程學(xué)院 裝備再制造技術(shù)國防科技重點(diǎn)實(shí)驗(yàn)室，北京 100072)
摘 要: 超高周疲勞是指材料經(jīng)受1×107循環(huán)周次以上而發(fā)生斷裂損傷的疲勞行為，徹底打破材料“無限壽命”的傳統(tǒng)觀點(diǎn)，逐漸成為疲勞研究領(lǐng)域一個(gè)新的熱點(diǎn)問題。回顧近幾十年國內(nèi)外的研究成果，總結(jié)了超聲疲勞試驗(yàn)方法的進(jìn)展和應(yīng)用，分析了金屬材料超高周疲勞S-N曲線的典型特征以及內(nèi)部斷裂的裂紋萌生機(jī)制和擴(kuò)展特征，探討影響超高周疲勞行為的主要因素，即加載頻率、材料組織和氫含量。在此基礎(chǔ)上，提出了今后超高周疲勞研究的一些方向：裂紋源表面萌生和內(nèi)部萌生的競爭性機(jī)制及影響因素，超高周疲勞的壽命預(yù)測和再制造零部件的超高周疲勞行為。
關(guān)鍵字: 金屬材料；超高周疲勞；超聲疲勞試驗(yàn)；S-N曲線；失效特征
（National Key Laboratory for Remanufacturing, Academy of Armored Forces Engineering, Beijing 100072, China）
Abstract:The very high cycle fatigue (VHCF) regime is defined as where the cyclic of structural component is greater than 1×107 load applications, which thoroughly breaks the traditional concept of infinite life. The fatigue behaviors in the VHCF range is becoming a hot subject in the research field. The research achievements on the VHCF in the past decades were reviewed. The development and application of ultrasonic fatigue testing were summarized. The typical characteristics of S-N curves and the basic understandings of cracking initiation and propagation were analyzed. The influential factors for VHCF mainly including load frequencies, microstructure and hydrogen contents were discussed. In addition, some possible and prospective topics of future researches were proposed.
Key words: metal material; very high cycle fatigue; ultrasonic fatigue testing; S-N curve; failure characteristic
