Activity: Talk or presentation › Talk or presentation at a conference
In this presentation different multi-scale modeling techniques for the description of quasi-brittle fracture will be discussed. A number of relevant issues will be treated in more detail, such as the non-standard computational homogenization for localization phenomena and the extension of the multi-scale models to dynamic and fatigue fracture problems. There are limitations to the well-known multi-scale schemes in cases where the separation of scales is relatively small. Direct coupling can be used in those cases through coupled-volume or domain decomposition techniques. Furthermore, small-scale effects that are normally averaged out through computational homogenization can not always be ignored. For instance, dispersive effects may become relevant in dynamic multi-scale analyses when dominant wave lengths in the macroscopic response are of the same order as the size of a representative volume element. A dispersion tensor can then be derived in order to enhance the multi-scale scheme. The use of multiple spatial length scales together with fracture models that are regularized by the introduction of a length scale parameter result in analyses with multiple interacting length scales. These various length scales should be properly dealt with. Efficiency of the computational multi-scale modeling schemes will also be discussed.
28 Feb 2018
Conference on Computational Modelling of Concrete and Concrete Structures