Multiscale-Method based on Atomistic/Continuum Coupling for Tribological Problems at Nanoscale.

• Applicant: Professor Dr.-Ing. Udo Nackenhorst, since 4/2014
• Subject Area: Mechanics
• Term: from 2012 to 2016
• Project identifier: Deutsche Forschungsgemeinschaft (DFG) - Project number 214790164

The physics of friction of solid bodies takes place at various length and time scales. Computational multi-scale approaches (FEM) to resolve the fractal topology of contacting surfaces are based on continuums-mechanics assumptions, where constitutive model is required at each length-scale. By using molecular dynamics (MD) approaches the basic atomic interactions are considered. However, the boundary conditions from the substrate in the global framework are represented in a rather simplified manner. The goal of the proposed research project is the consistent coupling of both approaches with the focus on the investigation of frictional contact, in order to optimize surface textures for engineering applications. From scientific point of view, one major challenge is modelling the transformation of random atomic vibrations into heat variables of the continuums model. In addition, this requires the derivation of suitable discretization methods and related numerical algorithms. The development of sophisticated computational techniques for concurrent multiscale coupling with focus on frictional contact problems is proposed in this project. Reliability, numerical stability and sensitivity with regard to model parameters will be studied during the first period. Techniques for parameter identification and model validation based on experimental investigations are planned for the second funding period.

• DFG Programme: Research Grants
• Ehemaliger Antragsteller: Dr.-Ing. Wenzhe Shan, until 4/2014