A novel NTFA approach
We are happy to announce our most recent advances in thermo-elasto-plastic homogenization. Our novel method is based on the Nonuniform Transformation Field Analysis (NTFA), which is extended to now deal with variations of all elastic and plastic material parameters. This extension is highly non-trivial since thermo-elastic eigenstress problems are the foundations of the NTFA, which are now temperature-dependent. Instead of building the NTFA coefficient matrices based on the solution of the full-order model, we suggest using a reduced-order model for the auxiliary problems.
Thereby, the temperature-dependent coefficients can be computed online. Even better though, they can be precomputed at many (e.g., 1000) temperatures during the offline phase. Thereby, the data for a universal NTFA subroutine can be prepared and shared.
The method is applied to the prediction of eigenstresses in surface-modified copper substrate obtained from laser melt injection of tungsten carbide particles.
Article information
Fritzen, Felix and Herb, Julius and Sharba, Shadi, Thermo-Plastic Nonuniform Transformation Field Analysis for Eigenstress Analysis of Materials Undergoing Laser Melt Injection