Contact Mechanics (11)

On behalf of Professor George Adams. This is an overview of contact mechanics models in case of two spheres. The overview starts with Hertz model and continues to adhesive models and Greenwood-Williamson. A very good good summary for the case of two spheres.   Read More

Contact mechanics code useful for calculating subsurface stress

This work demonstrates the importance of summit parameters for an anisotropic Gaussian rough surface. It is shown that lay direction may significantly affect the running-n wear process.   Read More

A script that solves the linear complementarity problem associated with the Boussinesq contact mechanics problem   h = K*p+g, h'*p=0, h,p >=0, where the unknown h is the gap between two elastic (half-space) bodies and the unknown p is the corresponding contact pressure. It can also be found at file exchange at the MATLAB Central   Read More

Tribology Simulator is a software for the simulation of the most common tribological contact – a contact of two surfaces in a sliding motion. Besides the macro geometry surfaces can have microgeometry or nanogeometry (roughness). The contact may also be lubricated or dry. Examples of the problems that can be solved with Tribology Simulator: nominally smooth hydrodynamic simulation, nominally smooth and rough contact simulation (pressure and subsurface stress calculations, deflections), Stribeck Curve simulation (calculation of friction in mixed lubricated contacts), calculation of contact temperatures in solids, wear and wear particles simulation and surface roughness evolution, tribofilm generation. A manual can be found in the Help section. If you dont have MATLAB installed, you will need to install the MATLAB Compiler Runtime (MCR, free for download). See readme.txt file for further details. Solvers are based on the half-space approximation theory for the contact, thermal and hydrodynamic simulations, which makes it faster compared to Finite Element Method or other fully numerical approaches.   Read More

These m-files calculate the adhesive parameters of the contact between 2 spheres based on the mechanical and geometrical properties of these 2 bodies and show the pressure distribution in such a contact.   Read More

A Matlab code (GUI) for calculation of friction coefficient in mixed lubricated conditions. Asperity based, including statistical (Greenwood and Williamson), deterministic models. Fully elastic and elastic-plastic deformation regimes. Both point and line contact cases considered. Applicable to the contact with uniform film thickness (highly loaded). Moes fit is used to calculate central film thickness. Run stribeck_simulator.m.   Read More

The code plots the stress field along x direction due to a cuboid strain located in the center of coordinates system in an Infinite Space. The matlab file reproduces a plot from paper: "On the stress field due to initial strains in a cuboid Surrounded by an Inifinte Elastic Space", Chiu, 1977. It is useful in construction of 3D FFT based algorithm for calculation of elastic stress field due to initial strains (or residual, thermal, etc.).   Read More

A Matlab based line contact EHL solver with artificial diffusion for highly loaded cases. The degree of the diffusion is controlled. Fully coupled, differential deflection based numerical scheme. Finite difference discretization, central difference approximation of the pressure term and 2-nd order backward difference approximation of the wedge term. Roelands pressure-viscosity relation. It is designed for solving highly loaded cases. Newtons numerical solver is used. Launch run_numerical.m.   Read More

A Matlab based line contact EHL solver. Fully coupled, differential deflection based numerical scheme. Finite difference discretization, central difference approximation of the derivatives. Roelands pressure-viscosity relation. It is optimized for lightly deforming contacts. Newtons numerical solver is used. Fast to converge, accurate solution. Launch run_numerical.m.   Read More

A simple matlab code for calculation of Hertz solution (Hertz model) for line, point and elliptical contacts. Also shows a plot of resultant pressure and deflection (not for elliptical contact)   Read More