A model system of spherical deformable filler particles (Sephadex beads) embedded in a gelatin gel matrix was studied in order to gain an understanding of the mechanical behavior of complex foods of a filled system type. The strength of the interaction between the filler particles and the matrix was varied by using an anionic Sephadex and different pH's in the range of 3-8. The work was extended to starch gels (wheat, maize and potato) in which the solubilization amylose represented the matrix and the gelatinized starch granules the filler. Shear modulus was determined at low deformation with a pulse shearometer and compressive strength was measured under uniaxial compression with an Instron using lubricated plates. The results indicated that the shear modulus of composite gels is dependent on the shear modulus of the matrix, the deformability of the particles, and their volume fraction. At high compressive strains the failure properties were controlled by the affinity between filler and matrix. A.S.SzSlender Viscosities Fiber Flow. William W. Schultz (Dept. Mechanical Eng. and Applied Mechanics, Univ. of Michigan, Ann Arbor, MI 48109, USA) J. Rheol. 31.733-750 (1988).The rheological behavior was investigated of thin, axisymmetric liquid jet (fiber) emerging from an orifice into a passive gaseous environment. Previously advanced onedimensional models are shown to violate the axisymmetric equations of motion because of the viscoelastic behavior which makes the flow more two-dimensional. Questions are raised about the validity of elongational viscosity measurements of highly elastic fluids. A S .Sz . ) J . Rheol. 31, 751-784 (1987).The orientation state of fibers in a suspension or a composite can be represented by a series of even-order tensors which are free from assumptions about the shape of the probability distribution function. A fourth-order description can predict the effect of orientation on the mechanical properties exactly, but a second-order description and closure approximation can do nearly as well.A.S.Sz.

No abstract

No abstract

Elsevier Vernet, N.; Ruiz, E.; Advani, S.; Alms, JB.; Aubert, M.; Barburski, M.; Barari, B.... (2014) Abstract:In this second international permeability benchmark, the in-plane permeability values of a carbon fabric were determined by 12 participants worldwide. One other participant also investigated the deformation of this fabric. The aim of this work was to obtain comparable results in order to make a step towards standardization of permeability measurements of fibrous reinforcements. The procedures used by most participants were according to the guidelines defined for this exercise after the first benchmark. Unidirectional injections in three in-plane directions of the fabric were conducted to determine the unsaturated in-plane permeability tensor. Parameters such as fiber volume fraction, injection pressure and fluid viscosity have been fixed in order to minimize sources of scatter. The comparison of the results from each participant was encouraging. The scatter between data obtained while respecting the test guidelines was close to the scatter of the setups themselves. A slightly 2 higher dispersion was observed when some parameters differed from the recommendations.Overall, a good correlation is observed between all the results of this exercise.

No abstract