Journal of Materials Science

, Volume 43, Issue 1, pp 88–97 | Cite as

Interface layer effect on the stress distribution of a wafer-bonded bilayer structure

  • Yin Zhang


The interface layer plays an important role in stress transfer in composite structures. However, many interface layer properties such as the modulus, thickness, and uniformity are difficult to determine. The model developed in this article links the influence of the interface layer on the normal stress distribution along the layer thickness with the layer surface morphology before bonding. By doing so, a new method of determining the interfacial parameter(s) is suggested. The effects of the layer thickness and the surface roughness before bonding on the normal stress distribution and its depth profile are also discussed. For ideal interface case with no interfacial shear stress, the normal stress distribution pattern can only be monotonically decreased from the interface. Due to the presence of interfacial shear stress, the normal stress distribution is much more complex, and varies dramatically with changes in the properties of the interface layer, or the dimensions of the bonding layers. The consequence of this dramatic stress field change, such as the shift of the maximum stress from the interface is also addressed. The size-dependent stress distribution in the thickness direction due to the interface layer effect is presented. When the interfacial shear stress is reduced to zero, the model presented in this article is also demonstrated to have the same normal stress distribution as obtained by the previous model, which does not consider the interface layer effect.


Normal Stress Interface Layer Interfacial Shear Stress Interfacial Parameter Feature Thickness 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.



The author is thankful for the financial support of the National Natural Science Foundation of China (NSFC, Grant No. 10502050) and the Scientific Research Foundation for the Returned Overseas Chinese Scholars, State Education Ministry.


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Copyright information

© Springer Science+Business Media, LLC 2007

Authors and Affiliations

  1. 1.State Key Laboratory of Nonlinear Mechanics (LNM)Institute of Mechanics, Chinese Academy of SciencesBeijingP.R. China

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