PALERMO-Multi-scale approaches for heterogeneous materials and interfacesThe first task regards a multi-scale computational strategy for the analysis of heterogeneous periodic materials and structures. A computational homogenization strategy will be employed to transfer data from a mesoscopic Unit Cell (UC) to the macroscopic equivalent continuum. At the mesoscale the UC will be considered discontinuous and made by aggregates and interfaces. Elasto-plasticity and continuum damage mechanics will be used for the UC constituents. At the macro-scale two alternative strategies will be adopted to finely tune a meso-macro transition procedure: plastic band equivalent to the developed meso-scale fracture pattern or smeared form obtained by applying the innovative phase-field method.The second task concerns large displacement cohesive-frictional interface models in which the material parameters are derived from a sub-scale thin layer. The goal is to develop a finite displacement interface element consistent with large displacement mechanics and with interface constitutive relations thermodynamically consistent and able to reproduce the main fracture mechanisms in pure and mixed modes.
MULTI-SCALE MODELLING AND SIMULATION – PALERMOIt focuses on the development of advanced multi-scale modelling techniques to be applied to geometrically periodic micro-structured materials and structures. In particular the focus is on general multi-scale techniques and on homogenization methods, respectively.– Multi-scale techniques for micro-structured materials and meso-structured systems.This task concerns the formulation of multi-scale computational strategies for the analysis of materials and structures endowed with heterogeneous periodic micro-structure to be applied to many of the examples considered in the project. The approach will be based on the solution of a Boundary Value Problem which will be employed to transfer data from a detailed mesoscopic Unit Cell (UC), representative of the heterogeneous micro-structure, to the macroscopic equivalent continuum. To keep maximum generality, at the mesoscale, the UC will be considered discontinuous and constituted by aggregates and interfaces, the latter modeled making use of constitutive models already proposed in the last years by researches of the RU.Each constituent of the UC will be modeled in the framework of elasto-plasticity and continuum damage mechanics introducing possible multi-physics interactions. – Homogenization techniques.This task, strictly related to previous concerns the development of constitutive laws for micro-structured multi-phase materials, like porous SMAs, taking into account a suitable representative volume element, the morphological distributions of heterogeneities inside it (e.g. pores, inclusions), the mechanical properties of them and possible multi-physics interactions.A computational homogenization technique, able to derive the constitutive response of heterogeneous materials and efficiently implementable into a multiscale numerical procedure, will be studied. To this end, two requirements should be fulfilled by the homogenization approach: accuracy and reasonable computational effort. One of the goal will be to apply the non-uniform Transformation Field Analysis.
Nanotecnologie, materiale e produzione
|Data di inizio/fine effettiva||2/5/17 → 2/4/20|