Spontaneous brittle-to-ductile transition in aqueous foam

摘要: A single layer of foam bubbles between parallel plates fails (fractures) when subjected to an applied pressure. The fracture can occur in both a ductile mode and brittle mode. It is shown that dissipative effects during propagation crack lead spontaneous brittle-to-ductile transition, which occurs dynamically be experimentally resolved its details. transition the driving pressure at tip drops below necessary maintain supersonic crack. theory taking into account lateral opening together with air flow successfully predicts occurrence location this novel transition.