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: The low moduli of the flowable composites do not allow their use in posterior cavities under high stress, but this does not exclude their use for minimally-invasive Class I cavities when the opposing tooth is stabilized to a large amount on the natural enamel.
168 citations
TL;DR: In this paper, the surface and bulk elastic modulus of both thin and thick polystyrene films were evaluated using atomic force microscopy with a spherical indenter, and the results showed that the elastic properties of the thin and the thick films were slightly smaller than that of the bulk values.
Abstract: Using atomic force microscopy with a spherical indenter, we evaluated the surface and bulk elastic modulus of thick and thin polystyrene films. The elastic modulus of the thick films at penetration depths of more than 10nm was equivalent to that of bulk measured by a tensile test. In the thin films, the estimated values were greatly affected by the substrate material at penetration depths of more than 7nm. When the penetration depth was less than 5nm, however, the elastic modulus of both thin and thick films was slightly smaller than that of the bulk values.
168 citations
TL;DR: In this article, the influence of expanded clay and shale aggregates on the mechanical performances of concrete is studied through their volume fractions and aggregate qualities, and a reverse determination of the elastic modulus of LWA is carried out based to the experimental data.
168 citations
TL;DR: In this article, the relationship between structural and porous features and the mechanical properties of aerogels is discussed in terms of percolation theory and the fractal approach and it is shown that the exponent of the power law does not depend on fractal features.
Abstract: The density and the structure (fractal and non-fractal) of aerogels are modified either by the adjustment of the gelifying concentration, by a precise control of the viscous flow sintering process or by an isostatic pressure deformation. These aerogels have porosities ranging from 98% to 0%. The mechanical properties of the different aerogels (elastic modulus and strength) measured by 3 point bending, are dependent on their structure; they vary by five orders of magnitude as a function of density and follow power law evolution. However for the same relative density the elastic modulus and strength can increase by one order of magnitude due to a change in connectivity. These structural differences have been observed by SAXS experiments. The effects of the sintering process compared to that of the plastic transformation on the mechanical properties are explained by the associated structural changes. Sintering increases the network connectivity and the densification by compression leads to a new spatial arrangement of the clusters but their internal structure is not affected. In addition, relationships between structural and porous features and the mechanical properties are discussed in terms of percolation theory and the fractal approach. We show that the exponent of the power law does not depend on the fractal feature and percolation is only an approximation which cannot describe results.
168 citations
TL;DR: In this paper, the effects of laser processing parameters on the microstructure and mechanical properties of selective laser-melted magnesium were investigated and the results showed that the micro-structure characteristics of the lasermelted samples are dependent on the grain size of SLM magnesium.
168 citations