The authors have studied the mechanical properties of two-size disc mixtures, in relation to their geometrical structure. These packings present an orientational order: the spatial extent of this order, depending on the composition of the sample, has been measured in terms of a characteristic length xi . The stress-strain law in an oedometric compression is particularly sensitive to the disorder of contacts between the discs, but also clearly depends an orientational order.
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Ammi et al. (1990) studied this question.
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