Finite element simulations reveal that plastic deformation stabilizes circular buckles, indicating improved adhesion and durability in coated systems.
Circular buckles are known to develop morphological instabilities while expanding, above a critical diameter, as predicted in the framework of the elasticity theory. Those initial instabilities further lead to branching, then to full delamination of the films. Well-defined circular buckles are however frequently observed experimentally at large scale on ductile films. In this context, we performed finite element simulations to investigate the role of plasticity in buckles growth. Our results show that plastic deformation significantly stabilizes circular buckles by altering mode-mix and thereby enhancing interfacial toughness. These findings clarify why circular buckles persist in ductile films and highlight the implications for adhesion and durability in coated systems.
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MENG et al. (2026) studied this question.
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