机械结合面弹塑性接触统计学模型

In order to reflect the mechanices of elastic, elastic-plastic, and plastic deformation of mechanical joint interface, the real area of contact, contact load and contact stiffness model of joint interface are developed based on the statistical method with analysis of an elastic-plastic asperity microcontact. Theoretical calculation results show that the dimensionless contact load increases as the dimensionless mean surface separation decreases. The dimensionless real contact area and contact stiffness increase with the increases of the dimensionless contact load, especially, the value of real contact area reach the nominal one when the contact load increases to a certain extent, but the value of contact stiffness deviates from the ideal one. The dimensionless real contact area increases as the plasticity index increases, and the dimensionless mean surface separation and contact stiffness decrease in the elastic and elastoplastic deformation regime. The dimensionless mean surface separation and contact stiffness increase as the plasticity index increases, and the dimensionless real contact area decreases in the fully plastic deformation regime.