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Volume fraction
About: Volume fraction is a research topic. Over the lifetime, 16312 publications have been published within this topic receiving 374181 citations.
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TL;DR: In this article, the authors report new experimental results on granular compaction under consecutive vertical taps and show that the evolution of the mean volume fraction and the mean potential energy of a granular packing presents a slow densification until a final steady-state, and is reminiscent to usual relaxation in glasses via a stretched exponential law.
Abstract: We report new experimental results on granular compaction under consecutive vertical taps. The evolution of the mean volume fraction and of the mean potential energy of a granular packing presents a slow densification until a final steady-state, and is reminiscent to usual relaxation in glasses via a stretched exponential law. The intensity of the taps seems to rule the characteristic time of the relaxation according to an Arrhenius's type relation >. Finally, the analysis of the vertical volume fraction profile reveals an almost homogeneous densification in the packing.
131 citations
TL;DR: In this paper, the authors applied the friction stir processing technique to fabricate boron carbide particulate reinforced copper surface composites and investigated the effect of B4C particles and its volume fraction on microstructure and sliding wear behavior of the same.
131 citations
TL;DR: In this article, the thermal conductivities of several nanofluids (dispersions of alumina nanoparticles in ethylene glycol) were measured at temperatures ranging from 298 to 411 K using a liquid metal transient hot wire apparatus.
131 citations
TL;DR: In this article, the critical stress intensity factor and other related fracture parameters have been measured in three-point bending for pure Al2O3-TiC composites containing 4 to 35 volume fractions of TiC.
Abstract: The critical stress intensity factor and other related fracture parameters have been measured in three-point bending for pure Al2O3-TiC composites containing 4 to 35 volume fractions of TiC. An increase has been observed for all the parameters with increasing volume fraction of TiC. Following a study of the mode of fracture, the results are explained in terms of a linear variation of the fracture energy with the volume fraction of TiC.
131 citations
TL;DR: In this paper, the electrical properties of carbon-black-epoxy composites measured in the frequency range of 100 Hz to 1 MHz are reported, in remarkable disagreement with the predictions of the statistical percolation theory for real and imaginary parts of the conductivity.
Abstract: ac and electrical properties of carbon-black–epoxy composites measured in the frequency range of 100 Hz to 1 MHz are reported. Experimental results are in remarkable disagreement with the predictions of the statistical percolation theory for real and imaginary parts of the conductivity. They both exhibited, in particular, an abrupt variation at a given fraction of carbon black. The evolution of these transport quantities with the volume fraction of carbon black can only be explained considering a phase transition from a dispersed to an agglomerated state of the conducting fillers. This transition has been successfully verified by optical micros-copy of thin polished sections of cured samples. A simple model based on electrostatic repulsion between the carbon-black particles is proposed to interpret such a singular insulator-to-conductor transition. S0163-18299901718-X
131 citations