实际结合面的法向接触刚度多尺度计算方法

A Multiscale Calculation Method of Normal Contact Stiffness of Actual Interfaces

针对结合面接触刚度解析计算与实际接触状态差异较大,基于有限元的大平面接触刚度计算由于计算量大难以实现的问题,提出一种结合面法向接触刚度多尺度计算方法。该方法在应用测量仪器获取结合面平面度、波纹度及粗糙度形貌特征的基础上,应用小波分解技术获取真实形貌特征,并基于有限元微观接触分析建立局部接触刚度与压强之间的关系,基于有限元宏观接触分析获取结合面压强分布,宏-微观结合计算获得结合面法向接触刚度。该方法具有能够真实反映结合面接触状态、计算效率高等特点,法向接触刚度试验结果表明,该方法是一种计算结合面法向接触刚度的有效方法。

It puts forward a multiscale calculation method of normal contact stiffness of actual interface, aiming at the fact that there is great difference between analytical calculation and actual contact status, and contact stiffness calculation of large plane based on FEM is difficult to implement because of the large amount of calculation. The method uses wavelet decomposition technique to obtain the actual topography characteristics, based on the flatness, waviness and roughness characteristics of the interface measured by the instruments. It establishes the relationship between local contact stiffness and the pressure based on finite element microscopic contact analysis, obtains the pressure distribution of the interface based on FE macroscopic contact analysis, and then calculates the normal contact stiffness by combining the microscopic analysis and the macroscopic analysis. The method is able to reflect actual contact status, and has a high calculation efficiency. The result of the normal contact stiffness test shows that it is an effective method for calculating normal contact stiffness of interfaces.