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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 12    No. 3    June 2002

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Research on magnetic testing method of
 stress distribution
LI Lu-ming(李路明), HUANG Song-ling(黄松岭), WANG Lai-fu(汪来富),
YANG Hai-qing(杨海青),SHI Ke-ren(施克仁)

Department of Mechanical Engineering, Tsinghua University,
Beijing 100084, China

Abstract:For implementing nondestructive evaluation of stress distribution inside ferromagnetic material, a magnetic testing method was developed which does not need artificial magnetizing field. This method was implemented by testing the normal component of the magnetic flux leakage above the object being tested with a constant lift-off from 1 to 10mm. The distribution of the stress inside the specimen can be gotten from that of the normalcomponent of the magnetic flux leakage. A stress concentration specimen, which is a 10mm thickness mild steel plate with a welding seam on it, was tested using this method. The stress distribution of the magnetic testing was identical with that of small hole stress testing method. It indicates that the stress distribution of ferromagnetic material can be known by the magnetic testing method.

 

Key words: magnetic testing; stress distribution; welding seam

ISSN 1672-7029
CN 43-1423/U

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