关键词: 裂纹扩展, 凡士林袖膜, 超载, 停歇

Abstract:

The article described a discovery of fatigue crack growth alleviation effect by painting vaseline films in crack tip zone under different loading conditions.lt has been shown that painting vaseline films in crack tip zone can significantly decrease crack growth rate, under both constant amplitude loading and with a single overloading. The mechanism of the phenomenon was then discussed.A local vaccum condition established at the newly asacked tip by the flims which might isolate an aggressive environment was regarded as the main cause of the alleviating effect. It may be possible to develop a new procedure of repairing cracked structures according to this discovery.

Key words: crack grouth, vaseline films effect, overload, underload