Symposium topic and vision
Size-effects at multiple scales govern the mechanisms that determine the macroscopic material response exploited by engineers worldwide in the development of everyday structures. The structural dimensions set the constraint effect, and thereby influence damage evolution, crack propagation and plastic flow localization. The ductile void nucleation and growth to coalescence mechanism takes place at the micron scale and it inherits size effects related to the development of large strain gradients. The interaction and re-orientation of individual grains during intense plastic deformation gives rise to complicated hardening mechanisms. Complex slip system interactions, within individual metallic grains, lead to micro-structural features such as dislocation cell and wall structures. The phenomena stretch over multiple scales, from the dislocation level over the mesoscopic level of damage evolution, and they determine material hardening and strength. Damage and fracture models which include such multiscale details are maturing these years.
Recent advances in microscopy techniques are unraveling details of the mechanisms at play in plastic flow localization and damage evolution, alongside with the micro-structural features that develop. Combined with the progress in modeling techniques that covers multiple scales, such as atomistic methods, discrete dislocation methods and strain gradient plasticity theories, major advances in the quantitative understanding of complex material systems are within reach.
The vision of this symposium is to bring new modeling techniques for size effects at various scales into quantitative models for damage and fracture, and through this development supply engineers with new and improved tools. The symposium will bring together scientists from the fields of experimental micromechanics, higher order continuum modeling as well as atomistic and discrete dislocation methods, with the aim of advancing both understanding and quantitative modeling. The symposium will focus on experimental methods for micron scale material characterization, as well as theoretical and numerical breakthroughs for material modeling across scales.