Failure analysis and the mechanism of 7020 aluminum alloy train coupler girder

J Chin Soc Corr Pro

2008, Vol. 28

Issue (4): 240-245 DOI:

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Failure analysis and the mechanism of 7020 aluminum alloy train coupler girder

上海材料研究所检测中心

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Abstract By means of optical emission spectrometer, universal material testing machine, optical microscope, scanning electronic microscope and finite element calculation were used to analyze the multi-cracking reason of 7020 aluminum alloy train coupler girder, and study results indicated that stress corrosion cracking (SCC) caused by wet and sweltering hot weather .According to finite element calculation results it could be known there was no stress at the “Z” direction, and welding residual tension stress is the main cracking reason. Modeling test results of DCB samples showed that the cracking mode of train coupler girder and DCB sample is same. Cracking mechanism of 7020 aluminum alloy was researched and discussed.

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Received: 19 February 2008

ZTFLH:	TG146.32
	U260.32

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. Failure analysis and the mechanism of 7020 aluminum alloy train coupler girder. J Chin Soc Corr Pro, 2008, 28(4): 240-245 .

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y2008/V28/I4/240

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