Modeling of creep deformation and its effect on stress distribution in multilayer systems under residual stress and external bending

A general theoretical model was developed to predict the creep deformation and its effect on the stress relaxation and distribution in the multilayer systems under residual stress and external bending. Based on the proposed solution, a simplified solution for the special case of one film layer on a...

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Bibliographic Details
Published in:Thin solid films 2009-03, Vol.517 (9), p.2924-2929
Main Authors: Chen, Qing-Qi, Xuan, Fu-Zhen, Tu, Shan-Tung
Format: Article
Language:English
Subjects:
Condensed matter: structure, mechanical and thermal properties
Creep
Exact sciences and technology
External bending
Mechanical and acoustical properties
Modeling
Multilayer
Physical properties of thin films, nonelectronic
Physics
Residual stress
Surfaces and interfaces
thin films and whiskers (structure and nonelectronic properties)
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Summary:A general theoretical model was developed to predict the creep deformation and its effect on the stress relaxation and distribution in the multilayer systems under residual stress and external bending. Based on the proposed solution, a simplified solution for the special case of one film layer on a substrate is also presented. Finite element analysis was carried out to validate the presented model. Good agreements were observed between the finite element simulation and the prediction of the proposed model. In addition, the effects of film thickness on creep strain and stress distribution, the creep effect on neural axis location in the bilayer assembly subjected to the combination of residual stress and external bending were also discussed.
ISSN:0040-6090
1879-2731
DOI:10.1016/j.tsf.2008.12.022