文章信息/Info

Title:

Study on Low Cycle Fatigue Performances of 2D70 Aluminum Alloy in Different Environments

作者:

施翔晶; 馬華

（洪都航空工業集團，江西 南昌，330024)��

Author(s):

SHI Xiangjing;  MA Hua

（HongDu Aviation Industry Group Corporation, Nanchang 330024, China）

關鍵詞:

低周疲勞; 濕空氣; 鹽霧; 鹽霧+SO₂

DOI:

10.7502/j.issn.1674-3962.2012.10.08

文獻標志碼:

A

摘要:

對2D70 Al合金在試驗室空氣、濕空氣、鹽霧及鹽霧＋SO₂ 4種環境下進行低周疲勞試驗，對比4種環境下的循環σε曲線及應變-壽命曲線，得出結論：相同應變下，2D70 Al合金隨腐蝕環境增強，循環應力降低；相同應變下，2D70 Al合金在鹽霧及鹽霧+SO₂ 2種環境下低周疲勞壽命相近，并且隨著腐蝕環境的增強，低周疲勞壽命降低；腐蝕環境越強，材料疲勞損傷程度越大。研究結果，為預測飛機不同環境的低周疲勞壽命及對飛機腐蝕防護及耐久性設計提供參考。��

Abstract:

 Having done a series of low cycle fatigue tests to 2D70 aluminum alloy under different environments which include laboratory air, moist air , NaCl fog and NaCl fog + SO2 Compare the cyclic stress versus strain curves and the strain versus life curves in four circumstances respectively which they can be obtained by above experiments. The conclusion will be made: Under the same strain, the circulation stress of 2D70 aluminum alloy reduces along with the corrosion environment strengthens; Under the same strain, the low cycle fatigue life in NaCl fog is close to the life in NaCl fog + SO2 of 2D70 aluminum alloy , and the low fatigue life reduces along with the corrosion environment strengthens. The corrosion environment is stronger, the fatigue damage of materials is bigger. The studies provide the reference to forecast low cycle fatigue lifes of airplane under different environments, and have important meaning on corrosion protection and durable design of airplane.��