Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报(英文版)

Transactions of Nonferrous Metals Society of China

Vol. 20    No. 10    October 2010

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Void damage evolution of LF6 aluminum alloy welded joints under
external load and thermal cycling conditions
MI Guo-fa(米国发)1, ZHAO Da-wei(赵大为)1, DONG Cui-fen(董翠粉)1,
NIU Ji-tai(牛济泰)1, 2, JIN Cheng(金 成)3

1.School of Materials Science and Engineering, Henan Polytechnic University, Jiaozuo 454003, China;
2. School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China;
3. School of Materials Science and Engineering, Dalian Jiaotong University, Dalian 116028, China

Abstract:Based on the simulated aerospace thermal cycling tests, the effect of thermal cycle on the void damage evolution mechanism of LF6 aluminum alloy welded joint was investigated. The results show that micro-voids form around the second phase particles under the thermal cycling tests. The thermal stress coupled with external stress leads to dislocations pile-up around the particles, and when the dislocation density reaches a certain degree, the stress concentration will exceed the bonding strength at the interface between particles and matrix, resulting in the formation of micro-cracks. The numerical simulation is successfully implemented with the finite element to describe the void damage evolution of the welded joint under thermal cycling conditions.

 

Key words: aluminum alloy; welded joint; thermal stress; numerical simulation; micro-void

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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