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Mechanical properties of fat-based semi solid heterogeneous materials

Fat based pasty products are an essential part of food industries, both as process intermediate or end products. Such materials are made of a continuous fat phase in which solid particles are dispersed. Phenomena such as yield and fracture occur in those materials and depend heavily on the composition of the samples. The crystallization of fat is altered in presence of particle, which leads to products with different physical properties. However, because of the very complex aspect of the problem, very few studies have been trying to characterize the influence of the solid particles on the final product. Small amplitude oscillatory rheology is often used to characterize the stiffness of the materials. But processed products might not meet the desired shape necessary to perform rheology experiment, which require a very specific product shape that might not be easily achievable when it comes to industrial trials. Oscillatory rheology is therefore not always the best option to measure the physical properties of hard fat mixes. In this paper, we formulate binary mixes consisting of a hard fat matrix in which we added solid inclusions of sodium chloride. We create various set of samples with different salt and fat volume fraction and let them crystallize for a few weeks. We then perform various micro indentation protocols on the resulting samples. We then elaborate a small rheology model that is in accord with the data, and is able to predict the small deformation of heterogeneous materials indented by various shapes and loading protocols. We derive various physical quantities from this model such as the storage and loss moduli. We conclude by stating that the complex modulus of the binary mix grows with the solid volume fraction, following the classical Krieger Dougherty empirical law (similarly to suspensions), to finally diverge at a given volume fraction.