2D70铝合金不同环境低周疲劳性能研究

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

对2D70铝合金在试验室空气、湿空气、盐雾及盐雾+SO2四种环境下进行低周疲劳试验,将得到的四种环境下的循环σ-ε曲线及应变-寿命曲线分别进行对比,得出结论:相同应变下,2D70铝合金随腐蚀环境增强,循环应力降低;相同应变下,2D70铝合金在盐雾及盐雾+SO2两种环境下低周疲劳寿命相近,并且随着腐蚀环境的增强,低周疲劳寿命降低。

Having done a series of low cycle fatigue tests to 2D70 aluminum alloy in different environments which include laboratory air, moist air , NaCI fog and NaCI fog ＋ SO2. it compares 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, thei low cycle fatigue life in NaCI fog is close to the life in NaCI fog ＋ SO2 of 2D70 aluminum alloy , and the low fatigue life reduces along with the corrosion environment strengthens.