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The aim of DIGIMU® is to propose an industrial solution for simulating microstructure changes, at the mesoscopic scale and on Representative Elementary Volumes (REVs), during metal forming processes.
DIGIMU® is the result of research projects conducted for more than ten years at the CEMEF (Material Forming Center) in collaboration with many industrial stakeholders from the metallurgy, aeronautics and nuclear sectors. The two pillars of DIGIMU® software development are the extensive experimental work and the constant improvement of existing numerical methods, which allow CEMEF to be at the forefront of world research in the field.
Microscopy of a nickel-based alloy carried out by the MSR group, CEMEF MINES Paris-Tech
The full-field approach proposed by DIGIMU® has two main objectives:
DIGIMU® generates digital polycrystalline microstructures representative of the material's heterogeneities (compliance with the topological characteristics of the microstructure). The boundary conditions applied to the REV are representative of that experienced by a material point at the macroscopic scale (thermomechanical cycle of the considered point). Based on a Finite Elements formulation, the various physical phenomena involved during metal forming processes are simulated (recrystallization, grain growth, Zener pinning due to second phase particles, etc.).
Anisotropic mesh adaptation used when no precipitation or nucleation occurs. Only the grain and particles boundaries are finely discretized.
Model CDRX, for example in aluminium alloys
In high stacking fault energy materials, the consideration of progressive formation and evolution of subgrains is essential. Dislocations could rearrange to form new low-angle grain boundaries (LAGB) or accumulate into preexisting LAGB. In the CDRX context, grain formation is induced by the progressive reorganization of dislocations into subgrains with a progressive increase in the misorientation angle between these subgrains. Based on the Gourdet-Montheillet model, incorporated to the LS-FE framework, a new full-field CDRX module was implemented in DIGIMU®. Now you can monitor recrystallization as your material deforms. You can also couple CDRX to an evolving population of SPP!
Other improvements
In the short term:
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