Rough Surface Elastic Microslip Contact Analysis

When the contact body under coupled tangential force and normal force in the plane,but the size of the tangential force is not enough to make macro relative sliding of two contact bodies,then the contact problem will become microslip contact problem.In practical engineering,the mechanical parts such as bolts,gears and hinge often work under the condition of small vibration,then the contact between mechanical parts becomes the microslip contact in this case,and the surface of these parts are not ideally smooth.So this article mainly researches the contact problem with rough surfaces.In the process of solving the microslip contact problem,the calculation of surface deformation is very time-consuming,so this paper introduces the discrete convolution and fast Fourier transform(DC-FFT)method and the multi-level integration method to accelerate the calculation of surface deformation,and in terms of calculation speed and the relative error are compared.Through the contrast analysis,the DC-FFT method is more suitable for solving elastic deformation.Discrete convolution and fast Fourier transform method and conjugate gradient method can quickly and accurately solve the rough surface contact problem,after verification found that this method is suitable for solving different surface roughness and different shapes of point line surface contact problems.Join the tangential force to normal contact,normal contact problem becomes a micro slip contact problem,the surface stresses of homogeneous and heterogeneous micro slip contacts are calculated for different shear forces,and analyzes different non-Gaussian rough surface on the influence of the maximum surface contact stress.The application of the above method to the fretting contact problem of rough surfaces can also be solved accurately and rapidly,and compared with the micro slip contact.