关键词: 工程仿生学, 耦合, 非光滑, 试验优化设计, 有限元计算, 凹坑, 应力

Abstract: The comparative experiments on the abrasion under unlubricated friction condition between the samples with smooth and coupling nonsmooth surfaces were performed by help of the experimental optimum design.It was found that the wear rate of the samples with the concave nonsmooth surface is less than those with the smooth surface under the other same experimental conditions,i.e.the wearing resistance of the former is better than the latter.In order to discuss the effect of the nonsmooth concave on the stressstrain distributions on the sample surface,the sample stresses in the samples were measured at the compression condition,and analyzed by the finite element method using the software ANSYS.The results show that the concave structure ameliorates the surface stress distribution of the nonsmooth sample,makes the local stress between concaves less apparently than that of the smooth sample,that means the local low stress areas are formed on the nonsmooth surface.Moreover,the torque effect and low stress release effect of the nonsmooth structure were proposed preliminarily.

Key words: engineering bionics, coupling, nonsmoothness, experimental optimum design, finite element analysis, concave, stress