摘要
通过对在EXCO(exfoliation corrosion)溶液中加速腐蚀不同时间后的LC4CS试件表面腐蚀形貌进行观测,得到不同腐蚀时间下试件表面蚀坑深度及底部曲率半径。通过分析给出张开角的定义,并以此确定危险蚀坑及预测预腐蚀件的疲劳寿命。研究结果表明:张开角可以合理地确定危险蚀坑以及初始裂纹的等效尺寸。通过算例分析,用张开角来确定危险蚀坑可以较好地预测预腐蚀件的疲劳寿命。
The corrosion morphology of specimens of aluminum alloy LC4CS soaked in EXCO （exfoliation corrosion） solution were examined by microscope to obtain depth of pits and radius of curvature at the bottom of pits with different pre-corrosion times. The definition of opening angle was proposed by analyzing experimental results, so the critical pits was determined and the pre-corrosion fatigue life was predicted based on the opening angle. Calculated life for example showed that opening angle could determine the critical pits and the equivalent dimension of initial crack. Examined by calculating an example, the critical pits determined by opening angle could be used to predict the pre-corrosion fatigue life reasonably.
出处
《机械强度》
CAS
CSCD
北大核心
2013年第2期207-213,共7页
Journal of Mechanical Strength
关键词
预腐蚀
张开角
危险蚀坑
疲劳寿命
Pre-corrosion
Opening angle
Critical pit
Fatigue life
