Cumulative energy analysis of thermally-induced surface wrinkling of heterogeneously multilayered thin films

摘要: Wrinkling is a well-known example of instability-driven surface deformation that occurs when the accumulated compressive stress exceeds critical value in multilayered systems. A number studies have investigated instability conditions and corresponding mechanisms wrinkling deformation. Force balance analysis bilayer systems, which thickness capping layer importantly considered, has offered useful approach for quantitative understanding wrinkling. However, it inappropriate multilayer (layer > 3) consisting heterogeneous materials (e.g. polymer/metal or inorganic), variation substrate also crucial. Therefore, to accommodate additive characteristics we thermally treated tri- quad-layer samples multilayers generate wrinkles used cumulative energy consider individual contribution each constituent layer. Unlike composite model, wherein effect highly overestimated heterogenously stacked multilayers, our precisely reflects bending given system, with results match well experimental values. Furthermore, demonstrate feasibility this as metrological tool simple straightforward estimation thermomechanical properties polymers, whereby delicate change Young's modulus thin polymeric near its glass transition temperature can be successfully monitored.