Conformation and Performance of adhesive pads of Katydids (Orthoptera Tettigoniidae)
螽斯吸附足垫的构造及其吸附性能分析

Many insects possess smooth adhesive pads on their legs, which adhere by thin films of a two-phasic secretion. To understand the function of such fluid-based adhesive systems, friction forces and adhesive forces of katydids on different surfaces was measured. Construction of the pads and the action of adhesion and detachment were observed through high speed video camera. And the contact area was also tested. The results show that friction force is larger than adhesive force. Pads pull toward the body to increase friction when in contact with the surface. The method of peeling is used to separate, but the direction of peeling in katydids is opposite from that in hairy pads. It peels from the end of the pad and so to obtain the aim of moving promptly and saving the energy. The results can be used for the design of biomimetics.