The fundamentals of plastic deformation : several case studies of plasticity in confined volumes.

Abstract

Plasticity in small volumes is significantly different than in large, bulk-like specimens. The strength of materials in the micron and sub-micron regime depends not only on the microstructure but also on the size of the material. Given that a number of important mechanical processes occur at these length scales, it is important to build a comprehensive understanding of these materials and processes. This work examines several different processes in small volumes. The motion of dislocations in the drag regime are examined as a function of material volume which exhibits higher drag than in the bulk. The stability of single arm sources are also investigated using molecular dynamics. Finally, dislocation nucleation from the free surface is investigated using both atomistic as well as continuum models. These results provide a better understanding of plastic processes in confined volumes.3 Acknowledgment

Using Coarse-Grained Molecular Models (Molecular-Mesoscale) of a Copper Oxide-Epoxy Interface to Obtain Stress–Strain Failure Predictions Which Include Interfacial Roughness, Water and Filler Effects

“…In this region, bond elongation, limited rotation, and van der Waals (as well as electrostatic and hydrogen bond) interaction are all important contributors to the deformation resistance. Once the bonds and non-bonds have deviated into non-elastic domains, the molecular models again become less quantitative, but can still be used in a qualitative sense [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16], unless the models are scaled to the extent that all combinations of interactions have been sampled [28,29]. This type of scaling is often impractical because most companies cannot afford the computational resources necessary (large high performance computing facilities would not be available).…”