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The detection of fatigue damage by exoelectron emission

 

作者: William J. Baxter,  

 

期刊: Journal of Applied Physics  (AIP Available online 1973)
卷期: Volume 44, issue 2  

页码: 608-614

 

ISSN:0021-8979

 

年代: 1973

 

DOI:10.1063/1.1662232

 

出版商: AIP

 

数据来源: AIP

 

摘要:

Plastic deformation of metal enhances the photoelectron emission producing so‐called exoelectrons In our experiments the metal surface is scanned by a small spot of ultraviolet light and the electron emission is recorded as a function of position of the light spot. Results for aluminum and steel demonstrate that fatigue deformation produces exoelectron emission after less than 1% of the fatigue life. The regions of emission are very localized; some are beyond the resolution of the apparatus (15 &mgr;m). The localized emission increases throughout the fatigue life, and failure finally occurs in the region of most intense emission. The regions of intense emission are attributed to the development and propagation of fatigue cracks.

 

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