Journal of Solid Mechanics and Materials Engineering
Online ISSN : 1880-9871
ISSN-L : 1880-9871
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Fatigue Crack Propagation Analysis for Micro Solder Joints with Void
Takeshi TERASAKIHisashi TANIE
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JOURNAL FREE ACCESS

2007 Volume 1 Issue 2 Pages 169-180

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Abstract
Voids in a solder joint can reduce their fatigue life. Voids are caused by the presence of flux in solder paste during reflow soldering, and they are difficult to remove completely. From numerical analysis, we aimed to obtain criteria for evaluating the effect of voids on fatigue life in a solder joint.
We investigated crack propagation in the micro-solder joints of a semiconductor and developed a new crack propagation model. In our model, the fatigue life of a solder joint is evaluated based on damage that is accumulated during crack propagation, and crack paths are automatically calculated. The crack-propagation behavior of a center-cracked-plate (CCP) specimen calculated using the new model agreed well with that obtained from measurement.
Using our model, we analyzed the effect of positions and sizes of voids on crack paths and the fatigue life of a ball grid array (BGA) structure. The crack paths and the fatigue life were both found to strongly depend on the positions and sizes of voids. We have achieved a reliable method of evaluating the effects of voids in a solder joint.
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© 2007 by The Japan Society of Mechanical Engineers
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