（HongDu Aviation Industry Group Corporation, Nanchang 330024, China）
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DOI:
10.7502/j.issn.1674-3962.2012.10.08
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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.