Topic
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, a simple and general method for making ceramic laminates with porous crack-deflecting interlayers is demonstrated, and the influence of resulting porosity on the ability of an interlayer to deflect a growing crack and to remain stable on prolonged heating is investigated.
Abstract: A simple and general method for making ceramic laminates with porous crack-deflecting interlayers is demonstrated. Both the strong laminae and the porous interlayers are made by tape casting suitable slurries using the same ceramic powders. Porosity is introduced into the interlayer by adding starch particles to the slurry. The effects of the starch on the burn-out and sintering behavior of the laminates has been fully described. The influence of resulting porosity on the ability of an interlayer to deflect a growing crack and to remain stable on prolonged heating has also been investigated. For the pore morphologies studied here, it is the volume fraction of pores that controls whether crack deflection takes place. Using existing mechanics solutions, a simple theoretical criterion for this volume fraction of porosity is given and is consistent with all the experimental observations.
120 citations
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TL;DR: In this article, a gas-solid fluidized bed reactor has been simulated applying CFD techniques in order to investigate hydrodynamic and heat transfer phenomena in a bimodal particle mixture.
120 citations
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TL;DR: In this article, high stress abrasive wear behavior of aluminium alloy (ADC-12)-SiC particle reinforced composites has been studied as a function of applied load, reinforcement size and volume fraction, and compared with that of the matrix alloy.
119 citations
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TL;DR: In this paper, effective direct current (dc) resistivities and alternating current (ac) complex permittivity measurements were carried out on two series of polymer/multiwalled (MW) carbon nanotube composite samples as function of the CNTs volume fraction and temperature.
Abstract: We report the results of effective direct current (dc) resistivities and alternating current (ac) complex permittivity measurements carried out on two series of polymer/multiwalled (MW) carbon nanotube (CNT) composite samples as function of the CNTs volume fraction and temperature The CNTs have typical aspect ratio over 100:1 and are quasiuniformly dispersed in two types of polymer host [epoxy and polystyrene (PS)-cobutyl acrylate latex] according transmission electron microscopy characterization A percolation threshold occurs in the composites with the PS latex matrix when the CNT volume fraction is 0012 In contrast, the set of resistivity data for samples containing epoxy resin as host matrix is not representative of an intrinsically percolation transition Atomic force microscopy, coupled to the measurement of the local electric resistances, permits us to study the agglomerate distribution in both types of composites The differences in morphology between the two series of polymer/MWCNTs are attributed to interface effects between the elongated filler nanoparticles and the polymer chains Comparison of the measured effective dc and ac resistivities, at temperatures ranging from 30 to 300 K, with Sheng's model supports the fact that charge transport in the composites follows a thermal fluctuation induced tunneling mechanism, in which the tunneling of the electrons through the thermally induced fluctuating potential barrier formed by a thin insulating polymer layer separating MWCNTs aggregates The spectral behavior of permittivity is consistent with a power-law form Several mixing laws were tested to represent the filler fraction dependence of the effective permittivity in the microwave range of frequencies; however, none of them is able to quantitatively describe the sets of data The basic deficiency of these formulas is that they make no explicit reference to the internal length scales in the composite samples
119 citations
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TL;DR: In this paper, the authors investigated the convection of a nano-encapsulated phase change materials (NEPCM) suspension in a cavity with a hot wall having a time-periodic temperature.
119 citations