The modelling of rigid body impacts in two and three dimensions is a research area of growing interest. Several models have recently been proposed, some at a microscopic level, where each impact is modelled in detail, and others at a macroscopic level, where individual impacts are modelled approximatively but the overall behaviour of an assembly of rigid bodies is of primary concern. One of the main problems arising in these investigations is the difficulty of validating the models against experimental data. This is primarily due to the complexity of obtaining accurate data for all but the simplest cases of contact experiments.
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