Current methodologies used for the inference of thin film stress through system curvature measurements are strictly restricted to stress and curvature states which are assumed to remain uniform over the entire film/substrate system. Recently Huang, Rosakis, and co-workers [Acta Mech. Sinica, 21, pp. 362–370 (2005); J. Mech. Phys. Solids, 53, 2483–2500 (2005); Thin Solid Films, 515, pp. 2220–2229 (2006); J. Appl. Mech., in press; J. Mech. Mater. Struct., in press] established methods for the film/substrate system subject to nonuniform misfit strain and temperature changes. The film stresses were found to depend nonlocally on system curvatures (i.e., depend on the full-field curvatures). These methods, however, all assume uniform substrate thickness, which is sometimes violated in the thin film/substrate system. Using the perturbation analysis, we extend the methods to nonuniform substrate thickness for the thin film/substrate system subject to nonuniform misfit strain.
On the Stoney Formula for a Thin Film/Substrate System With Nonuniform Substrate Thickness
Feng, X., Huang, Y., and Rosakis, A. J. (January 14, 2007). "On the Stoney Formula for a Thin Film/Substrate System With Nonuniform Substrate Thickness." ASME. J. Appl. Mech. November 2007; 74(6): 1276–1281. https://doi.org/10.1115/1.2745392
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