Mechanism map for a misfitting film on a viscous substrate

Sridhar, N.; Cox, B. N.; Srolovitz, D. J.
April 2003
Applied Physics Letters;4/7/2003, Vol. 82 Issue 14, p2233
Academic Journal
Compressively stressed elastic films bonded to a viscous interlayer that separates the film from the substrate can experience stress relief by one of several mechanisms: buckling, in-plane expansion at free edges, or delamination from free edges. Here, results for edge relaxation and delamination are combined with prior work on buckling to provide a comprehensive map showing how the dominant stress relief and failure mechanisms depend on geometrical and material parameters. The mechanism map is constructed by comparing the characteristic relaxation times for each relaxation mechanism. The map provides the basis for simple engineering design rules to achieve a preferred failure mechanism.


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