Nonlinear unloading behavior has been observed in thin metal films on substrates. In the present work, the effects of this nonlinear unloading behavior on the strain energy release rate in bilayer decohesion experiments, in which a highly stressed overlayer (“driver”) is used to decohere a layer (“target”) from a substrate, is modeled. Cases where either the driver or the target layer are nonlinear are considered. For particular combinations of stiffnesses and thicknesses, the difference between linear and nonlinear unloading behavior can be quite large (several hundred percent) at experimentally observed stress levels. For practical cases of CR/CU and CU/glass driver/target layer combinations, the maximum difference is about 25%.
Effect of Nonlinear Elastic Behavior on Bilayer Decohesion of Thin Metal Films From Nonmetal Substrates
Contributed by the Applied Mechanics Division of THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS for publication in the ASME JOURNAL OF APPLIED MECHANICS. Manuscript received by the ASME Applied Mechanics Division, March 15, 2001; final revision, December 15, 2001. Associate Editor: D. A. Kouris. Discussion on the paper should be addressed to the Editor, Professor Robert M. McMeeking, Department of Mechanical and Environmental Engineering University of California–Santa Barbara, Santa Barbara, CA 93106-5070, and will be accepted until four months after final publication of the paper itself in the ASME JOURNAL OF APPLIED MECHANICS.
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Baker, S. P., Wang, X., and Hui, C. (June 20, 2002). "Effect of Nonlinear Elastic Behavior on Bilayer Decohesion of Thin Metal Films From Nonmetal Substrates ." ASME. J. Appl. Mech. July 2002; 69(4): 407–414. https://doi.org/10.1115/1.1468998
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