Analysis of edge and screw dislocation in complex layered oxide materials

Effect of edge dislocation on the yield stress and yield strain of tobermorite along the silicate layer directions

While the mechanism of defect, dislocations and dislocation cores are well studies for simple crystalline materials such as BCC or FCC crystals, there is very limited knowledge on such mechanisms in complex layered oxides and their influence on the mechanical properties. Here, we are interested to study the mechanisms of screw and edge dislocation in tobermorite, as a complex, layered oxide material that is a crystalline analog of Calcium-Silicate-Hydrate (C-S-H). The latter is the principal source of strength and durability in concrete where the influence of defects on mechanical properties are poorly understood. We use both continuum approach and atomistic simulations that together will provide critical information on the key mechanisms determining cross slip and the mobility of dislocations, a pattern influencing the bulk plasticity in in C-S-H and other complex layered materials.