Logo Leibniz Universität Hannover
Logo: Institut für Baumechanik und Numerische Mechanik/Leibniz Universität Hannover
Logo Leibniz Universität Hannover
Logo: Institut für Baumechanik und Numerische Mechanik/Leibniz Universität Hannover
  • Zielgruppen
  • Suche
 

Non-linear theory and adaptive FEM of martensitic phase transformation with technical application

Bearbeitung:Prof.em.Dr.-Ing.habil. Dr.-Ing.E.h. Dr.h.c. mult. Erwin Stein, M.Sc. Gautam Sagar
Förderung durch:This work is financed by the German Research Foundation (DFG Ste/51- 1 & 2).
Bild Non-linear theory and adaptive FEM of martensitic phase transformation with technical application

Shape memory alloys (SMAs) are widely used in technical application, e.g. in medical science because of their wide range of properties, as super-elasticity (SE), shape memory (SM) and bio-compatibility. The efficient design of complicated devices is based on reliable simulation of material and structural behavior. Thus, it is very important to have a reliable material model at hand which can describe cyclic thermo-mechanical loadings close to the real behavior. Martensitic phase transformation is a strongly coupled thermo-mechanical process. A major problem is the convexification of energy wells in the process of minimizing the free energy for the active phases for multi-variant phases. Most research was done for linearlized strains but PT-strains are can reach up to 15% such that finite strain formulations are adequate. This project has following research points: (1) PT-model with finite strains for single crystals with convexification and phase balance, (2) Nonlinear PT-model for polycrystals, (3) Twinning, (4) Energy dissipation, (5) Implementation in ABAQUS, (6) Error controlled adaptive meshing, (7) Verification of developed PT-model and 8) Technological aplications of industrial problems.

        

Project poster 1                                                            Project poster 2

Übersicht