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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 11    No. 6    December 2001

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Effect of constraint on crack propagation
behavior in BGA soldered joints
WANG Li(王  莉)1, WANG Guo-zhong(王国忠)1
FANG Hong-yuan(方洪渊)2,  QIAN Yi-yu(钱乙余)2

1. DiamlerChrysler SIM Technology Co, Ltd, Chinese Academy of Science,
Shanghai 200050, P.R.China;
2. National Key laboratory of Advanced Welding Production Technology,
Harbin Institute of Technology, Harbin 150001, P.R.China

Abstract: The effects of stress triaxiality on crack propagation behavior in the BGA soldered joint were analyzed using FEM method. The computation results verified that stress triaxiality factor has an important effect on crack growth behavior. Crack growth rate increased with increasing stress triaxiality at the near-tip region, which is caused by increasing crack lengths or decreasing solder joint heights. Solder joint deformation is subjected to constraint effect provided by its surrounding rigid ceramic substrate, the constraint can be scaled by stress triaxiality near crack tip region. Therefore, it can be concluded that crack growth rate increased when the constraint effect increases.

 

Key words:  constraint; crack; behavior; joints

ISSN 1672-7029
CN 43-1423/U

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