| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advances in Surface Engineering VII
|
| Presentation Title |
Thin Films Contact Deformation by Gaussian and non-Gaussian Rough Surfaces: a Dislocation Dynamics Study |
| Author(s) |
Riccardo Civiero, Lucia Nicola |
| On-Site Speaker (Planned) |
Riccardo Civiero |
| Abstract Scope |
Surfaces of metals, subjected to machining processes such as turning, milling, electrical discharge machining, or grinding, demonstrate self-affine properties. However, these machined surfaces deviate from the Gaussian distribution of surface heights typically observed in metallic surfaces, instead exhibiting a degree of skewness in their distributions. Experimental investigations into the contact mechanics of skewed surfaces have revealed deviations from the expected linearity of the contact area-normalized load relation. To quantify this deviation at small contact loads for negatively and positively skewed metal surfaces we use numerical simulations. The model is based on a two-dimensional Dislocation Dynamics approach and Green’s Function Molecular Dynamics to solve for the Boundary Value Problem. This tool provides a detailed description of the plastic response of the surfaces, by keeping track of the nucleation and glide of the dislocations and provides insights into the evolution of the microstructure and of the changes in contact surface during loading. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Computational Materials Science & Engineering, Surface Modification and Coatings, Modeling and Simulation |