|
5731 |
|
Thursday, June 08, 2017, Hall 28 9:40 AM Modeling & Simulation I |
|
Multiscale modeling of the mechanical response of chromium oxide coating microstructures |
|
Tomi Suhonen / VTT Technical Research Centre of Finland, Finland Tatu Pinomaa* / VTT Technical Research Centre of Finland, Finland Anssi Laukkanen/ VTT Technical Research Centre of Finland , Finland Jarkko Metsäjoki/ VTT Technical Research Centre of Finland , Finland |
|
To accelerate the development of new coatings, computational models can be used to understand the causal relations in a process-structure-properties-performance chain. For example, virtual mechanical tests help to understand the role of different microstructural features of experimental coatings, such as splat shape, interlamellar adhesion, and distribution of different phases. Furthermore, computer modeling makes it possible to systematically modify the properties and distribution of features. As a case study, we model the microstructural response of chromium oxide coatings. A scanning electron microscopy (SEM) image of a real coating is segmented into splat boundaries, chromium oxide (Cr2O3), and secondary phases that emerge in the coating deposition. The mechanical response of the coating is simulated with a mesoscale finite-element model. Each phase is assigned distinct anisotropic mechanical properties, and the intersplat cohesion is treated with special cohesion elements. In search of a better microstructure, the volume fraction and the morphology of the secondary phases are varied. The microstructural model is then coarse-grained to macroscopic scale, in order to simulate the com ponent-level response and performance. |