MICRESS Forum

Dear Tatalemon, unfortunatly, I do not see a clean solution for doing this. The implemented model in MICRESS is still based on the article I.Steinbach, M.Apel, "Multi Phase Field Model for Solid State Transformation with Elastic Strain", Physica D 217 (2006) 153-160. This model does not distinguish ...

Dear tatalemon, indeed we have no explainations about your issues in the MICRESS manual and the MICRESS text messages are not that helpfull, we will improve that in future updates! Let me add a few remarks along your questions: (1) What's the difference between the two input for "volume" and "matrix...

The stress and strain field is derived from the mechanical equilibrium condition. This condition defines a set of linear equations for the local displacements and the corresponding matrix is solved by the iterative BiCGSTAB-algorithm. The convergence criterion defines the termination condition for t...

I am sorry, but there is no output for the strain tensor components, you have to calculate it manually from the displacement field. The displacement is normalized by the domain size. To calculate an absolute e.g. x-displacement, you have to multiply ux with the length of the domain, i.e. if ux=0.4% ...

????? I would suggest 1.0097 for a +0.97% mismatch. Just try it out and look at the output for the displacement *uxCV, *uzCV. The definition of the elastic material properties has to be defined always in 3D. MICRESS takes into account 3D rotations of grains even for a 2D calculation. This leads some...

OK, MICRESS behaves at present a bit silent in this point .... As input you should give for each phase a tensor for the definition of the lattice symmetry. The lattice misfit is calculated according to your first definition. The identifier (number) for the matrix phase is the one MICRESS is asking f...

Not within MICRESS (therein we use rather a FEM-approach by constructing hexaeder-elements from the structured cubic grid used for solving phase field and diffusion equation). FFT or other spectral methods loses a lot of there advantages if one has to solve non-periodic structures or varying materia...

Dear Ning, the model for the stress/strain coupling is published in I. Steinbach, M. Apel: “Multi phase field model for solid state transformation with elastic strain”, Physica D 217 (2006) 2, pp. 153-160. Meanwhile, there are also two papers with further applications: I. Steinbach, M. Apel: „The in...

In addition you can generate a .TabGD output file by setting tab_grain_data. This file contains a vast amount of information, e.g. the grain volume derived by integrating over the phase field variable, the surface area of each grain, the number of neighboring grains, ... You can use this data e.g. t...