Lead: PI – Miroslav Živković
Activities in WP3, are related to the preparation of the source code in FORTRAN programming language, and the building of executable PAK-DAM file. The executable PAK-DAM will be available as online service at the Big Iron web server which can be executed remotely. Parallel solver MUMPS will be included in the PAK-DAM to increase the speed of computation. Five subactivities are foreseen in WP3. The first subactivity is coding of PAK-DAM input/output interface. Based on the determined requirements, instructions and algorithms in WP1, the needed material parameters are defined so, beside the general input data for a FEM analysis tool such as data about the elements and nodes, loading and boundary conditions, and type of analysis, the input format for material parameters will be prepared. The output of the PAK-DAM tool will be double: textual file for prompt access to the specific result and neutral file which can be read by a wide range of post-processing tools (ParaView, GiD, FEMAP). The second subactivity is coding of damage constitutive models in PAK-DAM. Plasticity and concrete phase field damage models are planned as the most used materials in engineering structures. The algorithms and implementation instructions are prepared in WP1. Source code will contain stress integration procedures at integration point level for plasticity models (Ramberg-Osgood and Simo yield functions) and for concrete. In the third subactivity, the damage energy will be computed and delivered to the multifield 1D, 2D, or 3D finite elements source code which contains interpolation functions, displacement-strain matrix, damage-damage gradient matrix for displacement and damage phase field. Unequal interpolation orders for the field variables will be used to avoid the stress oscillations and numerical locking. The fourth subactivity is related to the implementation of the alternating minimization (AM) solver in the standard Newton-Raphson method in the PAK-DAM source code. The fifth subactivity is writing of the instructions for easy using of the PAK-DAM tool in “User manual for PAK-DAM software tool” with all the details: preparation of examples and problems, preparation and editing of *.dat input file, execution of the pak-dam.exe, interpretation of results in output file *.lst, and visualization of the results using the output file *.neu, instructions for implementation of new PFM materials.
