关键词: 航空材料, 弹性涂层, 冲蚀, 内聚力单元

Abstract: A multi-particle erosion model of elastic coating is established based on cohesive elements, the stress distribution on coating and bonding layer with erosion caused pit damage is analyzed. The influence of erosion density, particle distance and erosion times on stress distribution on coating and bonding layer are discussed. Results show that: with the same pit depth, the maximum values of radial contact stress and shear stress of bonding layer locate at the contact edge. The bigger erosion density of particles is, the smaller the maximum tensile stress of the coating becomes, the less likely it is to crack. The maximum radial stress on coating locates at the contact edge of the outermost particles. There is no interaction between particles when the distance between circle centers is bigger than the sum of their diameters. The locations of crack and delamination get closer to the contact edge when the stress produced by repeated erosion is smaller than single erosion.

Key words: aviation material, elastic coating, erosion, cohesive element