【摘要】 对在EXCO溶液中预腐蚀后的LC4CS光滑试件和缺口试件进行疲劳试验,得到不同预腐蚀时间的S-N曲线及预腐蚀疲劳缺口系数。通过分析腐蚀过程,阐述了腐蚀对疲劳缺口系数的影响机理,建立了描述预腐蚀疲劳缺口系数的两参数模型,并进行了试验验证。结果表明:LC4CS材料的疲劳缺口系数随预腐蚀时间呈现出先降后升的变化趋势,其拐点出现在剥蚀开始阶段。更多还原

【Abstract】 The notched and smooth specimens of aluminum alloy LC4CS soaked in EXC O solution for different time are tested under the constant amplitude cyclic lo ading to obtain S-N curves and fatigue notch factors with different pre-corros io n time.By analyzing the corrosion process of LC4CS specimens in EXCO solution,the influence mechanism of corrosion on fatigue notch factor is expounded.Then,a two-parameter model used to describe the change of corrosion fatigue notch f actor with time is established and verified by experiment.The results show that the pre-corrosion fatigue notch factor of LC4CS material decreases at first an d then increases with the increasing pre-corrosion time.The inflection point ap pears at the beginning of denudation stage.更多还原