腐蚀环境下LC4铝合金疲劳损伤累积规律研究

Research on Fatigue Damage Cumulative Rule under Corrosion Environment

进行了在加速腐蚀当量环境作用后 ,LC4铝合金在同级载荷作用下疲劳损伤累积规律的实验研究。实验结果表明 ,此时的同级载荷试验类似于常规条件下的“低、高”两级载荷试验 ,前级载荷对腐蚀作用后的后级载荷的疲劳行为也有“低载锻炼效应” ,因此 ,提出了考虑腐蚀环境作用的损伤累积“迟滞”模型。与实验结果的比较表明损伤累积“迟滞”

Tests of LC4 aluminum fatigue damage cumulative under fatigue(l) + corrosion + fatigue(2) mode have been carried out. The test results show that equal level loading tests under the mode have an analogy with low-high two level loading tests under general conditions. Preceding loading has a forging effect of low loading on the fatigue behavior of behind loading. Hence, this paper presents a damage cumulative hysteretic model under corrosion environment. The predicted results of the damage cumulative hysteretic model and the test results mode are in good agreement.