Hosni Idrissi (University of Antwerp, Belgium)
Mechanical behavior of crystalline materials strongly depends on the microstructure and its evolution at different length scales which is governed for instance by the crystallography, the point/line/surface defect content and distribution, grain morphology, or texture. Predicting macroscopic mechanical responses on the component or specimen scale requires models that appropriately describe the mesoscale response i.e. the evolution of the underlying microstructure, or intra- and inter-granular stresses. This is a challenging task and depends on finding and exploiting the synergies between modeling and experiments.
In recent years, mathematically rigorous single and poly-crystalline plasticity models have emerged that - guided by experiments - capture the physics behind dislocation accumulation and re-distribution responsible for the evolving microstructure. Among others, these have motivated the development of (i) hybrid approaches that couple different modeling frameworks at the same length scale, for example thermodynamically rigorous phase field models augmented with dislocation transport theory, and (ii) multiscale models that include well- defined information transfer between different time/length scales comparable to those of experiments. The predictive capabilities of these methods have strongly benefited from the connection with experiments e.g. for validating structure-property relations or obtaining physical initial states.
This highlights the need to direct further efforts towards enhancing the modeling experimental synergy. On one hand, experimental techniques exist which are suitable for direct comparison with model predictions if fully exploited. These include in-situ and ex-situ neutron and x-ray diffraction, strain mapping, TEM, SEM, HR-TEM, APT, HR analytical TEM and can be complimented with initial microstructure characterization using advanced orientation mapping techniques such as 3D EBSD, ACOM TEM and 3D XRD microscopy. On the other hand, with the acquired physics knowledge base, simulations may guide experiments and point them into new directions.
This symposium will gather researchers working on the state-of-the-art of multiscale modeling of materials, microstructure characterization, and small-scale mechanical testing providing input for models on all relevant length and time scales. It will provide a platform for exchanging views and ideas to promote and improve passage of information between simulations and experiments and for discussing success stories on synergies between modeling on different length/time scales and experiments. The symposium will include individual topics or combinations from the following non-exhaustive list: