For optimal usage of heterogeneous nanomaterials in various industrial applications, it is critical to obtain fundamental understanding of deformation mechanisms at micron- and sub-micron length scale, where individual defects could play critical roles in exhibiting mechanical and functional properties. However, fundamental understanding of such mechanisms remains intriguing due to intricate interplay of both geometric characteristics and microscopic defects.
In this talk, we will discuss deformation mechanism at various length scale using a newly developed multiscale defect dynamics model, which could allow us to investigate collective motion of defects and their interaction as the basic building blocks for plastic deformation and the corresponding macroscopic mechanical response of heterogeneous nanomaterials. In addition, we employ a dislocation-based damage model using the developed multiscale defect dynamics model, which could provide a unique opportunity to investigate detailed dynamic evolution of microstructure during failure. The developed defect dynamics model will shed light on fundamental investigation of “defect-controlled” mechanical behaviors in heterogeneous nanomaterials under various multi-physical environments.