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Asymptotic behaviour of granular materials

机译:粒状材料的渐近行为

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The concept of the asymptotic behaviour of par-ticulate materials is described, including its enhancement by considering asymptotic states in extension. A 3D discrete element model with elastic spherical particles and the granulom-etry of a real sand is set up. The numerical sample is stretched from different initial states, and the influence of the strain rate direction on the final state is studied within the stress ratio, void ratio and mean stress space. Asymptotic behaviour is clearly observed, although the grains remain intact (no grain crushing is considered). The extension asymptotic states are observed, and the notion of a normal extension line is introduced. The extension asymptotic states coincide with the peak states observed in the shear tests with constant stress path direction in dense samples.
机译:描述了微粒状材料的渐近行为的概念,包括通过考虑延伸中的渐近状态来增强它的概念。建立了具有弹性球形颗粒和真实砂粒的3D离散元模型。从不同的初始状态拉伸数值样本,并在应力比,空隙率和平均应力空间内研究了应变速率方向对最终状态的影响。尽管晶粒保持完整(没有考虑晶粒破碎),但可以清楚地观察到渐近行为。观察到扩展渐近状态,并引入法线扩展线的概念。扩展渐进状态与在密集样品中具有恒定应力路径方向的剪切试验中观察到的峰值状态一致。

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