MULTISCALE SIMULATION METHODS IN DAMAGE PREDICTION OF BRITTLE AND DUCTILE MATERIALS

作者：Koenke Carsten; Eckardt Stefan; Haefner Stefan; Luther Torsten; Unger Joerg

来源：International Journal for Multiscale Computational Engineering, 2010, 8(1): 17-36.

• heterogeneous materials
• multiscale simulations
• damage
• fracture
• multigrid solver techniques

The damage and fracture behavior of technical as well as biological materials in engineering structures is nowadays often described by continuum damage theories or linear and nonlinear fracture mechanics on the macroscale. A major drawback of these approaches is their inability to consider the inherent microstructure of materials that governs the damage and fracture behavior. Although classical material models on the macroscale have the advantage to be easily applicable in simulations of large-scale engineering structures, the experimental determination of necessary material parameters, especially for the description of material damage effects, is demanding and often a direct identification of these parameters from experiments is not possible at all. Furthermore, these continuum-based models are not capable of explicitly describing all physical material effects, such as decohesion between grain and matrix material and the resulting microcrack evolution in cementitious materials. At the meso- and microscales, the material microstructure and therewith also the material heterogeneity on finer scales is described explicitly. Even with today's computational power, it is not affordable to simulate whole large structures on the meso- or microscale, and a coupling between models on different spatial scales (e.g., meso- and macroscale) becomes necessary. The resulting integrated multiscale models can be applied for the simulation of large-scale constructional components and to obtain detailed information on local microdamage effects at the same time.

• 出版日期2010