Fatigue life prediction of aluminum alloy with pre-corrosion damage based on damage mechanics
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摘要:
在工程结构中，腐蚀疲劳破坏是一种常见的现象，腐蚀坑处往往形成疲劳源，严重影响材料的疲劳特性。基于连续损伤力学理论，提出了含预腐蚀损伤铝合金疲劳寿命预测方法。首先，将腐蚀的影响分为2个方面，即腐蚀造成局部初始损伤和腐蚀形成的蚀坑造成局部应力集中；其次，建立了考虑预腐蚀损伤的疲劳损伤演化方程，并实现了相应的数值解法；然后，根据预腐蚀疲劳试验结果与数值计算结果，得到预腐蚀引起的材料初始损伤；最后，采用数值解法，对含预腐蚀坑的铝合金进行了寿命预估，并与试验结果进行对比，验证了所提方法的有效性。
Abstract:In engineering structures, the corrosion fatigue failure is a common phenomenon. The fatigue crack often occurs around the corrosion pit, which seriously affects the fatigue characteristics of materials. In this paper, based on the continuous damage mechanics, a method is proposed for the fatigue life prediction of aluminum alloy with pre-corrosion damage. First, the influence of corrosion is studied from two aspects: one is the local initial damage caused by corrosion, and the other one is the local stress concentration caused by corrosion pit. Then, the fatigue damage evolution equations considering pre-corrosion damage are established and the related numerical solution is implemented. After that, according to the results of pre-corrosion fatigue test and numerical prediction, the initial damage of material caused by pre-corrosion is obtained. Finally, the fatigue life of the aluminum alloy with pre-corrosion pit is predicted by the proposed method, and the predicted results are compared with the experimental results, which verifies the effectiveness of the proposed method.
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Key words:
- corrosion /
- fatigue damage /
- damage mechanics /
- finite element /
- aluminum alloy
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图 1 预腐蚀时间为0 h的疲劳试验结果
Figure 1. Fatigue experimental results when pre-corrosion time is 0 h
图 2 预腐蚀时间为48 h的疲劳试验结果
Figure 2. Fatigue experimental results when pre-corrosion time is 48 h
图 3 预腐蚀时间为120 h的疲劳试验结果
Figure 3. Fatigue experimental results when pre-corrosion time is 120 h
图 4 预腐蚀时间为240 h的疲劳试验结果
Figure 4. Fatigue experimental results when pre-corrosion time is 240 h
图 8 不同预腐蚀时间下的预估疲劳寿命与试验中值寿命的对比
Figure 8. Comparison between predicted fatigue life and experimental median life under different pre-corrosion time
表 1 2024铝合金的静力力学性能参数
Table 1. Static mechanical property parameters of 2024 aluminum alloy
参数 数值 E/GPa 72 ν 0.3 σs/MPa 380 σu/MPa 458 
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表 2 标定的2024铝合金的疲劳损伤演化参数
Table 2. Calibrated fatigue damage evolution parameters of 2024 aluminum alloy
参数 数值 β 1.85 M0 85 778 b1 0.005 b2 0.000 3 a 0.7
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表 3 不同预腐蚀时间下的2024铝合金的初始损伤度
Table 3. Initial damage degree of 2024 aluminum alloy under different pre-corrosion time
腐蚀时间/h 初始损伤度 48 0.02 120 0.04 240 0.1
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