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Journal of Zhejiang University SCIENCE A
ISSN 1673-565X(Print), 1862-1775(Online), Monthly
2014 Vol.15 No.6 P.447-453
A nonlinear cumulative evolution model for corrosion fatigue damage
Abstract: A nonlinear cumulative evolution model for corrosion fatigue damage was proposed. Corrosion fatigue damage was considered as a nonlinear cumulative result of stress corrosion damage and fatigue damage. The influences of stress corrosion damage and fatigue damage on corrosion fatigue damage and damage evolution life were studied from a phenomenological point of view. The relevant damage parameters were determined by the experimental results of the LY12CZ aluminum alloy, and the corrosion fatigue life evaluation model based on damage evolution law was established. The corrosion fatigue life predicted by evaluation model agrees well with the experimental result. The damage evolution model in this study can provide a new method for theoretical research and life prediction of corrosion fatigue.
Key words: Corrosion fatigue, Stress corrosion, Nonlinear accumulation, Damage evolution
创新要点：将应力腐蚀损伤与疲劳损伤非线性耦合，建立腐蚀疲劳损伤演化律，依托实验确定腐蚀疲劳损伤演化参数，形成基于损伤演化律的腐蚀疲劳寿命预测模型。
研究方法：采用理论研究与实验验证相结合的研究方法。选取特定材料设计应力腐蚀实验，回归应力腐蚀门槛值应力和损伤参数（图2）；查阅疲劳实验数据建立变幅疲劳损伤模型，将应力腐蚀损伤与变幅疲劳损伤非线性累加形成腐蚀疲劳损伤非线性演化模型。根据腐蚀疲劳实验结果，验证腐蚀疲劳损伤演化模型并确定非线性损伤累加参数（图5和6），形成基于损伤演化律的腐蚀疲劳寿命预测模型。
重要结论：从损伤力学角度，将材料的腐蚀疲劳损伤处理成应力腐蚀损伤与疲劳损伤的非线性累加，形成腐蚀疲劳损伤演化模型。结合LY12CZ铝合金的试验结果，验证了损伤演化模型的可行性。该方法可以为材料腐蚀疲劳的寿命评价研究提供新的思路。
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DOI:
10.1631/jzus.A1300362
CLC number:
TG174
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Cited:
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On-line Access:
2014-06-04
Received:
2013-10-29
Revision Accepted:
2014-02-17
Crosschecked:
2014-05-21