摘要：針對某型含預腐蝕損傷2系列航空鋁合金，研究裂紋從腐蝕坑處萌生、小裂紋擴展、長裂紋擴展至斷裂的過程。通過觀測不同預腐蝕時間下腐蝕坑特征尺寸，分析了腐蝕坑形貌、深度、開口面積隨預腐蝕時間的變化規律；通過復型法研究了腐蝕坑發展為小裂紋的過程，并對含預腐蝕損傷的鋁合金進行空氣與鹽水環境下的裂紋擴展試驗，結果表明：腐蝕坑深度隨腐蝕時間的增長速度要比腐蝕坑面積增加的快；小裂紋擴展路徑比較曲折，大部分裂紋形狀近似Z字形擴展；無論是空氣環境還是鹽水環境下，疲勞長裂紋的擴展速率主要由應力水平決定，應力水平越高裂紋擴展速率越快，而預腐蝕損傷程度對長裂紋擴展速率的影響不顯著。

　　關鍵詞：航空鋁合金，預腐蝕損傷，小裂紋，裂紋擴展

 Analysis of the crack initiation and propagation of a pre-corrosion aeronautical aluminum alloy
Wang Lei^*,+，Hui Li^*,+，Xu Liang^*,+，Zhou Song^+
*(Department of Mechanical and Electrical Engineering, Shenyang Aerospace University, Shenyang 110136,China )
⁺( Key Laboratory of Fundamental Science for National Defence of Aerouautical Digital Manufacturing Process，Shenyang 110136,China)

　　Abstract:The crack initiation and propagation including small cracks and long cracks from the corrosion pits of a 2 series pre-corrodedaeronautical aluminum alloy were analyzed. The changes of the corrosion pits' shapes, depths and openning areas were studied by observing the pits sizes. The replica method was utilized to investigate the small crack initation from the pits, and the long crack propagation tests both under the air and saltwater environments were implemented. Results show that the growth rate of the pits depths is faster than that of the pits areas, the small crack propagation paths are quite tortuous with Z-shaped lines. The stress levels have a stronger effect on the long cracks propagation rates both under the air and saltwater environments rather than the pre-corrosion defects.

　　Key words:aeronautical aluminum alloy, pre-corrosion defect, small crack, crack propagation

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