There are successful and standard ways to model materials for macroscopic engineering purposes. Likewise, there are many effective ways for atomic scale modelling, though only for relatively few atoms. But many materials properties of major importance depend on what happens at the mesoscale, where microstructures of ceramics or of teeth or bones, the dislocation engineering of metal alloys, and the spaghetti structures of polymers all have a major influence on performance. We discuss the main issues involved, and how such systems can be modelled effectively.
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