( 1. 東北大學機械工程與自動化學院， 沈陽 110004；
2. 沈陽航空工業(yè)學院機械工程系， 沈陽 110034；
3. 北京航空材料研究院，北京 100095)
摘 要: 對TC2鈦合金焊縫金屬疲勞表面短裂紋擴展行為進行了實驗研究，表明裂紋的擴展過程是多裂紋系統(tǒng)的演化過程。 基于實驗結(jié)果， 考慮到短裂紋擴展過程中的合并、 干涉作用等因素， 用應(yīng)力松弛區(qū)模糊化的方法， 建立了仿真模型， 對疲勞短裂紋演化的物理過程進行了數(shù)值模擬。將短裂紋演化行為模擬結(jié)果與短裂紋擴展復(fù)型的實驗結(jié)果比較， 可以看出兩者吻合較好， 表明所建立的準則合理、 實用。
關(guān)鍵字: 鈦合金； 焊縫金屬； 疲勞短裂紋； 數(shù)值仿真
HE Xue-hong1, LIU Jian-zhong3
（ 1. College of Mechanical Engineering and Automation,Northeastern University,
Shenyang 110004, China;
2. Mechanical Engineering Department,
Shenyang Institute of Aeronautical Industry, Shenyang 110034, China;
3. Institute of Aeronautical Materials, Beijing 100095, China）
Abstract: The propagation behaviour on surface short fatigue cracks of TC2 titanium alloy-weld was investigated according to the experiment. The results show that the process of crack propagation is a multi-crack system. Based on the experimental results, the simulation model was developed by using the method of the fuzzed relaxation regions. The effects of junction and interaction in the short crack propagation process were taken into account. And the simulation for the process of the short fatigue crack propagation and junction was realized. The results indicate that the method make more accurate to set out the process of the short fatigue crack evolution.
Key words: titanium alloy; weld; short fatigue crack; simulation
