多孔弹性胶体凝胶压缩强度与剪切强度的关系
The relationship between the compressional and shear strengths of poroelastic colloidal gels
摘要：
强颗粒凝胶被广泛认为在压缩中表现为多孔弹性，例如在沉降中，即使它们由于颗粒的粘性而不可逆地固结。颗粒状凝胶通常具有粘性和内聚性，因此通常会产生壁效应[Michaels & Bolger（1962）]。这些在工艺工程规模上很少表现出来，尽管它们在实验室和小容器中的配制产品中可能很重要。相对而言，当非线性孔隙弹性的假设与粘合破坏（屈服）是脆性的想法相结合时，就会出现剪切强度与抗压强度之比S以及它如何随密度变化的规定。S被预测为在凝胶点的顺序统一，然后迅速增加之后。的预测是一致的实验数据，可用于稀释和浓缩凝胶，虽然更多的数据将是受欢迎的。对Condre等人（2007）最近发表的一篇关于极稀凝胶中壁效应的论文进行了评论，其中认为，除其他外，没有必要引用颗粒来解释他们的结果，简单的粘附就足够了。
英文摘要：
Strong particulate gels are widely believed to behave poroelastically in compression, e.g. in sedimentation, even though they consolidate irreversibly because of the stickiness of the particles. Particulate gels are usually adhesive as well as cohesive and so wall effects are to be expected in general [Michaels & Bolger (1962)]. These are rarely manifest on process engineering scales, although they can be important in the laboratory and with formulated products in small containers. When the assumption of non-linear poroelasticity is combined with the idea that adhesive failure (yield) is brittle, relatively speaking, a prescription emerges for the ratio of shear to compressive strength S and how this varies with density. S is predicted to be of order unity at the gel-point and then to increase rapidly thereafter. The predictions are consistent with the experimental data available for both dilute and concentrated gels, although more data would be welcome. A critique of a recent paper by Condre et al. (2007) on wall effects in very dilute gels is given in which it is argued, amongst other things, that it is not necessary to invoke granular in order to account for their results, simple adhesion suffices.
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