Fatigue of rubber-modified epoxies: effect of particle size and volume fraction

1996 ◽  
Vol 31 (14) ◽  
pp. 3777-3789 ◽  
Author(s):  
H. R. Azimi ◽  
R. A. Pearson ◽  
R. W. Hertzberg
Keyword(s):  
Particle Size ◽  
Volume Fraction ◽  
Effect Of Particle Size

Effect of Particle Size of W-Brass Composite on Gamma-Ray Absorption Coefficient

2015 ◽  
Vol 754-755 ◽  
pp. 19-23
Author(s):  
Kahtan S. Mohammed ◽  
Ali Basheer Azeez ◽  
Mohd Mustafa Al Bakri Abdullah ◽  
Kamarudin Hussin ◽  
Azmi B. Rahmat
Keyword(s):  
Particle Size ◽  
Absorption Coefficient ◽  
Gamma Ray ◽  
Vickers Microhardness ◽  
Volume Fraction ◽  
Milled Powder ◽  
Microstructural Characterization ◽  
Effect Of Particle Size ◽  
Gamma Ray Attenuation ◽  
Attenuation Values

In this study, the dependence of gamma-ray absorption coefficient on amount and particle size of tungsten (W) in W-brass sintered compacts was investigated. To attain this goal, two sets of different W wt. % were prepared (W 65wt. %, W75wt. % and W85 wt. %). One set has compacts of as received powder and the other set has compacts of ball milled powder. The results showed that gamma-ray attenuation coefficient is inversely proportional to the particle size of the tested sintered compacts and directly proportional to the W content. Vickers microhardness, attenuation properties and microstructural characterization were carried out on the sintered samples. The attenuation test was conducted using gamma spectrometer with Genie 200 software. The samples of ball milled powder and of the highest volume fraction of W showed the highest hardness and attenuation values.

Computer Simulation of Electrorheological Fluids in the Binary System of Particle Size

1999 ◽  
Vol 13 (14n16) ◽  
pp. 1822-1827
Author(s):  
Yasushige Mori ◽  
Tetsu Tsunamoto ◽  
Hitoshi Nakayama
Keyword(s):  
Computer Simulation ◽  
Particle Size ◽  
Shear Stress ◽  
Fine Particles ◽  
Volume Fraction ◽  
Dielectric Polarization ◽  
Uniform Size ◽  
Polarization Model ◽  
Effect Of Particle Size ◽  
Er Fluids

One of the typical electrorheological (ER) fluids consists of suspension of fine particles in the liquid of low dielectric constant. Particles for ER fluids generally have a size distribution, and some experimental results were reported which showed the effect of particle size on the shear stress of ER fluids. On the other hand, the simulation by dielectric polarization model concluded that the shear stress calculated did not depend on the particle size under the same volume fraction of particles. In order to understand the effect of particle size, the two dimensional computer simulation was carried out for a system containing particles of different size, by using a model similar to that reported by Klingenberg et al. It was found that the shear stress of uniform size system did not depend on the particle size. When small and large particles, with the diameter ratio of 1:2, were mixed in equal numbers of particles, the chain-like clusters consisiting of both sizes of particles were formed. The shear stress and the response time of the binary size system were close to those of uniform size system, if the total volume fraction of particles was kept constant.

Effect of Particle Size and Distribution on the Viscosity of a Model Electrorheological (ER) Fluid

1999 ◽  
Author(s):  
Ying Chen ◽  
Hans Conrad
Keyword(s):  
Particle Size ◽  
Reasonable Agreement ◽  
Volume Fraction ◽  
Silicone Oil ◽  
Zero Field ◽  
Effect Of Particle Size ◽  
Er Fluids ◽  
Er Fluid ◽  
Modified Equation ◽  
Single Size

Abstract The zero-field viscosity of model ER fluids consisting of glass beads in silicone oil was determined as a function of average particles size (D¯ = 3–75 μm), volume fraction (ϕ = 0.1–0.3) and bimodal mixtures of two sizes. The viscosity increased with ϕ and decreased with D¯. The viscosity of the suspensions ηs in all cases was described reasonably well by the following relation:ηs=ηs,o(ϕ)+b(ϕ)D¯2/D¯3 where ηs,o(ϕ) and b(ϕ) are constants which increase with ϕ. Reasonable agreement with the Mooney crowding equation occurred for the single size particles, giving for the crowding factor k = 1.3 + 1.5/D¯. For ϕ < 0.2 the viscosity of the bimodal mixtures could be described by a modification of the Mooney equationηsηo=exp(2.76ϕ11-k1ϕ1)exp(2.76ϕ21-k2ϕ2) where ηo is the viscosity of the silicone oil, ϕi the volume fraction of each particle size Di and ki the normal crowding factor for that size. At ϕ = 0.3 the measured values of ηs for the bimodal mixtures became appreciably larger than those calculated from the modified equation. The decrease in particle size leads to both an increase in surface area of the particles per unit volume of the suspension and to a decrease in spacing (crowding); both factors probably contributed to the increase in ηs.

Effect of particle size and volume fraction on tensile properties of fly ash/polyurea composites

2010 ◽  
Author(s):  
Jing Qiao ◽  
Kristin Schaaf ◽  
Alireza V. Amirkhizi ◽  
Siavouche Nemat-Nasser
Keyword(s):  
Particle Size ◽  
Fly Ash ◽  
Tensile Properties ◽  
Volume Fraction ◽  
Effect Of Particle Size

A New Method for Fourier Analysis of Shapes of X-Ray Peaks and its Application to Line Broadening and Integrated Intensity Measurements

1968 ◽  
Vol 12 ◽  
pp. 208-235 ◽  
Author(s):  
R. L. Rothman ◽  
J. B. Cohen
Keyword(s):  
Particle Size ◽  
Fourier Analysis ◽  
Volume Fraction ◽  
Line Broadening ◽  
X Ray ◽  
Bcc Metals ◽  
Intensity Measurements ◽  
Integrated Intensity ◽  
Multiple Orders ◽  
Effect Of Particle Size

AbstractA method of Fourier analysis of x-ray line broadening is presented whereby microstrain, incoherent particle size, and fault probability can be calculated using only first-order peaks. This method can thus be used in studies of catalysts, vapor- and electrodeposits or heavily textured specimens for which second-order peaks are too broad or weak, in cases where the effect of particle size is not the same for all orders of a peak, or for multiphase specimens where overlap of peaks sometimes occurs. Examples of deformed FCG and BCC metals and alloys are presented, with comparisons to the method of multiple orders.One part of the procedure, first demonstrated by Pines and Sirenko, provides for reducing the effects of truncation on the Fourier coefficients. As a result, larger particle sizes can be analyzed and the integrated intensity can be determined more precisely. Application to determinations of volume fraction are given.

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