Topic
Elastic modulus
About: Elastic modulus is a research topic. Over the lifetime, 33153 publications have been published within this topic receiving 810247 citations.
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TL;DR: In this paper, a more extended characterization of the viscoelastic properties of Laponite suspensions near the liquid/gel transition has been given, in the linear regime, on a very extended scale, from 10-5 to 102 rad/s.
Abstract: Relations between thermodynamics, structural, and mechanical properties of Laponite suspensions were recently discussed in the literature. One important issue concerning the liquid/gel transition of the Laponite suspensions is to understand why a mechanical gel appears concomitantly with what appears as an incomplete nematic transition. To get some insight, we first give a more extended characterization of the viscoelastic properties of these suspensions near the liquid/gel transition. For this purpose, stress relaxation experiments are compared to direct determinations of the viscoelastic modulus in the frequency domain. This permits the following of viscoelastic properties, in the linear regime, on a very extended scale, from 10-5 to 102 rad/s. The data show that the relaxation mechanisms are very slow and are compatible with the presence of a large scale structural organization compared to the elementary particle size. The elastic modulus follows the power law: G‘ = A(C − C0)α. Only the concentration ...
297 citations
TL;DR: In this article, the mechanical and viscoelastic behavior of nanocomposites was investigated using a servohydraulic testing machine and a dynamic mechanical analyzer, respectively, and it was found that the addition of clay particles improved both the elastic modulus and storage modulus of pure epoxy significantly.
296 citations
TL;DR: In this paper, the influence of the ellipticity parameter and the dimensionless speed, load, and material parameters on minimum film thickness for low elastic modulus materials has been investigated.
Abstract: Elastohydrodynamic lubrication concepts of conjunctions of elliptical form are applied to materials of low elastic modulus. The influence of the ellipticity parameter and the dimensionless speed, load, and material parameters on minimum film thickness for these materials has been investigated. The ellipticity parameter was varied from a ball on plate configuration to a configuration approaching a line contact. The dimensionless speed and load parameters were varied by 1 order of magnitude. Seventeen different cases were used to generate minimum and central film thickness relations. Contour plots are presented that illustrate the pressure distribution and film thickness in the conjunction.
295 citations
TL;DR: In this article, the authors investigated the properties of blended low-calcium fly ash geopolymer concrete cured in ambient condition, and they found that the density of hardened GPC mixtures is similar to that of normal-weight OPC concrete.
295 citations
TL;DR: In this article, the chemical, physical, thermal and mechanical properties of curaua fibers, one of the unique fibers of the country, were determined for the first time, where the tensile strength and Young's modulus (YM) decrease while % strain at break remained constant as fiber diameter increases.
Abstract: Continuing the studies on the Brazilian lignocellulosic fibers, this paper presents chemical, physical, thermal and mechanical properties of curaua fibers, one of the unique fibers of the country. Stress–strain curves as a function of diameter of the fiber and static mechanical properties as functions of diameter, length of the fiber and as function of strain rate are determined for the first time. It was found that the tensile strength (TS) and Young’s modulus (YM) decrease while % strain at break remained constant as fiber diameter increases; decrease of TS and % strain at break and increase in YM as test length increased and an increase in TS and YM but without any change in % strain at break with increase of strain rate. Density, crystallinity, identification of chemical groups and degradation temperatures of these constituents of the fibers have been determined using pycnometer, X-ray diffraction, FTIR, UV and DTA/DSC instruments respectively. Dynamic mechanical analysis was also carried out, which revealed increase in modulus as the water present in the fiber is removed. All the results are discussed in terms of morphological observations including fractography.
295 citations