Micromechanical mechanisms development

Another chapter deals with the physical mechanisms of deformation on a microscopic scale and the development of micromechanical theories to describe the continuum response of shocked materials. These methods have been an important part of the theoretical tools of shock compression for the past 25 years. Although it is extremely difficult to correlate atomistic behaviors to continuum response, considerable progress has been made in this area. The chapter on micromechanical deformation lays out the basic approaches of micromechanical theories and provides examples for several important problems. 

It is noted, however, that both of the above CaF2 and Ti02 nanoceramics had some amount of porosity. This may account for an apparent soft behavior related to the superplastic deformation at low temperature, which does not yet reveal the plastic deformation characteristics in nanoceramics. Localized superplastic deformation under cyclic tensile fatigue tests was observed by Yan et al. on 3Y-TZP nanoceramics at room temperature [25], The micromechanism behind this phenomenon is argued to be essentially governed by grain-boundary diffusion. The contribution of dislocation slip might be in operation as a parallel mechanism to develop slip band-like microfeatures. 

Christopher Hill I assume that you are speaking specifically about the composite materials, not the biomedical collaboration. The important work in the composites area probably had to do with the development and elaboration of the field of the micromechanics of composites that was done on the mechanical engineering side of that partnership. 

This simple mechanism of chain pullout at the interface can be better visualized through a micromechanical pullout model [42] specifically developed for polymer glasses. Similar pullout models have also been developed for elastomer interfaces [43,44]. 

Fundamental investigations into the mechanical properties of RP constituents and into the gross mechanical properties of RPs have been termed micromechanics to indicate that the part of the RP under investigation is usually only a microscopically small part of the total RP. One of the principal goals of micro mechanics research is to develop analytical techniques for predicting elastic constants, stress-strain... 

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