MNT is a technology that accurately produces geometrically dimensional
shapes in the micro & nanometer scale. An emphasis on micro & nanoscale entities
will make our manufacturing technologies and infrastructure more sustainable in
terms of reduced energy usage and environmental pollution. The minimizing of the
workpiece and the small depth of cut makes the materials removal or deformation in
the MNT different from the traditional machining technique. Materials properties
follow from their atomic and microscopic structures and exhibit different properties
at different scales. Bulk materials of micro & nanometer scale are relatively large
and may be expected to behave as “macroscopic” object in some respects. At the
same time they are small enough to permit the long-time simulations necessary for
investigation of microscopic properties such as self-structural organization
processes. It is difficult to deeply investigate materials deformation or failure
mechanism using single macroscopic or phenomenological scale method. Multiscale
method can study material behavior at different length scale and temporal scale
simultaneously which can uncover important properties and materials response in
MNT from atomic to microscopic to mesoscopic to macroscopic scales. Multiscale
method offer the best hope for bridging the traditional gap that exists between
experimental approach, the theoretical approach and computational modeling for
studying and understanding the deformation and removal mechanism of materials in
MNT. Multiscale method conform to the basic natural philosophy ideas, namely,
every things should evolve from quantitative change to qualitative change. Owing to
the central role that multiple scale methodology appears poised to play in the
computational mechanics and materials science in the foreseeable future, this chapter
introduces multiscale method and some recent applications.
Keywords: Multiscale method, coupling continuum and atomistic method,
transition model, geometrical-physical model, multiscale simulation of microcutting.
