Extreme Mechanics Letters 83 (2026) 102458

Keywords: Bilayer, Films, Delamination, Bilayer peeling, Blister deformation, Interlayer debonding

Bilayer and multilayer films enhance functional performance through the designed property differences between their constituent layers, leading to their widespread application. The adhesive interface is crucial for stress transfer and for predicting structural delamination and deformation. This study investigates the blister deformation and subsequent delamination of a bilayer film subjected to shaft loading. A theoretical framework combining nonlinear elasticity and Griffith’s energy theory is developed to predict the film’s behavior. Finite element simulations and physical experiments are conducted to validate the theoretical predictions. Finally, we analyze the effects of different modulus ratios and pre-stretched conditions on deformation and delamination, providing insights for designing and optimizing bilayer film systems.

Ce Sun, Jian Sun, Jinsong Leng

Blister deformation and interlayer delamination in shaft-loaded bilayer films.pdf