  Collapse of lipidic ultrasound contrast agents under high-frequency
compressive load has been historically interpreted by the vanishing of surface
tension. By contrast, buckling of elastic shells is known to occur when costly
compressible stress is released through bending. Through quasi-static
compression experiments on lipidic shells, we analyze the buckling events in
the framework of classical elastic buckling theory and deduce the mechanical
characteristics of these shells. They are then compared to that obtained
through acoustic characterization.
