Título: Modelos epidémicos en redes aleatorias
Ponente: Dra. Leticia Ramírez (CIMAT)
Lugar: salón “Diego Bricio”
Hora: 4:00 pm
Resumen: En la exposición se aborda el problema de modelar el numero de personas que serán infectadas durante un brote infeccioso. Se presenta la metodología usada por Andersson, H. (1998) y Newman, M. E. J. (2002) y se discute el problema de este enfoque cuando puede surgir un "componente gigante.

Primera sesión
Título: Statistical reconstruction of heterogeneous materials
Ponente: Shaoqing Cui (Swansea University, Reino Unido)
Lugar: salón de seminarios “Diego Bricio Hernández"
Hora: 12:30 pm
Resumen: Predicting macroscopic properties of the materials with random microstructures is an important problem in many scientific and engineering fields, such as material science and geology etc. A critical part for property prediction is to reconstruct the material’s 3D microstructure, especially for heterogeneous media with random morphology. This presentation performs a general introduction about the statistical reconstruction of heterogeneous materials with some common descriptors and main existing methodologies, followed by a comprehensive comparison study to test a number of existing methodologies for statistical reconstruction of heterogeneous materials. The methodologies for this comparison study include Stochastic optimization algorithm, Descriptors-based approach, Direct reconstruction approach, Multiple-point statistics-based algorithm, Patch-based method and Phase-recovery algorithms. Finally, two main challenges for heterogeneous materials modeling are pointed out.

Segunda sesión
Título: Optimization of constitutive law library of PLCd FE code and its applications in multiscale analysis
Ponente: Stefano Zagui (CIMNE, Barcelona)
Lugar: salón de seminarios “Diego Bricio Hernández"
Hora: 13:00 pm
Resumen: The increased complexity of the materials implies the need of taking into account the microstructure and assessing its behavior. In this field PLCd is especially designed for the analysis of solid mechanics problems, which can be quasi-static and dynamic or seismic, taking into account material and geometric non-linearities. An important aspect of PLCd is its capacity to simulate large variety of material constitutive laws. The first aim of the collaboration with the CIMAT is to develop a Library able to export all the materials to others FE Codes. This library will be developed for optimizing the amount of memory used for the analysis in order to use the correct number of variables for each type of Constitutive Law. The second task of the collaboration is to use the PLCd capabilities in the Kratos FE Code to solve the Multiscale Analysis. One of the most important problem of the Multiscale Analysis is the CPU time spent to solve the RVE of macro structures involving a high number of finite elements to be used. Therefore it is necessary to find a new solution approach to reduce that time and optimize the solution algorithm. Our approach to that problem is based on the choice of the RVE calculation during the analysis. Indeed we calculate the micro structure only during the non-linear phase. This method provides a database of the microstructure able to describe all the strain-space until to the material non linearity. This database will be used to compare the stored strains with the real strain state of the gauss points of the macro structure that we want to solve. This methods can be considered as a “virtual” extension of the experimental analysis that we need to know when the material starts the non-linear phase.