Topic
Flexural strength
About: Flexural strength is a research topic. Over the lifetime, 52123 publications have been published within this topic receiving 846504 citations. The topic is also known as: bending strength & modulus of rupture.
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TL;DR: In this paper, a fracture mechanics approach was used to investigate the high strength of hot-pressed Si3N4 powders, and room-temperature flexural strengths, fracture energies, and elastic moduli were determined for material fabricated from α- and β-phase Si3 N4 powder.
Abstract: A fracture mechanics approach was used to investigate the high strength of hot-pressed Si3N4. Room-temperature flexural strengths, fracture energies, and elastic moduli were determined for material fabricated from α- and β-phase Si3N4 powders. When the proper powder preparation technique was used, α-phase powder resulted in a high fracture energy (69,000 ergs/cm2), a high flexural strength (95,000 psi), and an elongated (fiberlike) grain morphology, whereas β-phase powder produced a low fracture energy (16,000 ergs/cm2), a relatively low strength (55,000 psi), and an equiaxed grain morphology. It was hypothesized that the high strength of Si3N4 hot-pressed from α-phase powder results from its high fracture energy, which is attributed to the elongated grains. High-strength Si3N4 has directional properties caused, in part, by the elongated grain structure, which is oriented preferentially with respect to the hot-pressing direction.
274 citations
TL;DR: In this paper, a two-stage crushing process was utilized to produce recycled aggregate (RA) and the slump of concrete mixes prepared by technique of stone enveloped with pozzolanic powder (SEPP) was compared with those using normal mixing approach (NMA) or stone enveloping with portland cement (SEPC) approach.
273 citations
TL;DR: In this paper, the mechanical and thermal properties of green composites made from pineapple fibers and poly(hydroxybutyrate-co-valerate) (PHBV) resin are investigated.
Abstract: This paper presents the mechanical and thermal properties of unidirectional, degradable, environment-friendly “green” composites made from pineapple fibers and poly(hydroxybutyrate-co-valerate) (PHBV) resin. Tensile and flexural properties of the “green” composites with different fiber contents were measured in both longitudinal and transverse directions. Compared to those of virgin resin, the tensile and flexural strengths of “green” composites are significantly higher in the longitudinal direction while they are lower in the transverse direction. However, the mechanical properties are lower than those predicted by simple models. Scanning electron microscope (SEM) photomicrographs of the tensile fracture surfaces demonstrate fibers being pulled out from the matrix, the interfacial failure, fiber fibrillation, and the nonunidirectional nature of the “green” composites. The thermal behavior of the “green” composites, studied by differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA), showed that the presence of pineapple fibers does not affect the nonisothermal crystallization kinetics, crystallinity, and thermal decomposition of PHBV resin.
272 citations
TL;DR: In this article, the orientation and distribution of steel fiber-reinforced concrete are investigated by means of a suitable technique, by using a translucent fluid model with a yield stress (Carbopol 940).
272 citations
Journal Article•
TL;DR: In this paper, a simple theoretical study of the force systems at the plate/glue and the glued concrete interfaces is presented, which suggests that high stress concentrations and peeling forces are present at the ends of the plates when the composite beam is loaded in flexure.
Abstract: This paper deals with the problem of Anchorage at the ends of steel plates glued to the tensile faces of reinforced concrete beams. A simple theoretical study of the force systems at the plate/glue and the glued concrete interfaces is presented. This suggests that high stress concentrations and peeling forces are present at the ends of the plates when the composite beam is loaded in flexure. Tests carried out to investigate the effectiveness of different Anchorage arrangements are described in detail. The results from these tests confirm that, at the ends of the plates, interface stress concentrations exist, which have limiting peak values in the region of root 2 x tensile splitting strength of the concrete. Theoretical interface bond stresses, based on simple elastic behaviour, are found to have no consistent relationship to the measured peak values. However, if the maximum (unreduced) plate thickness is always used in these calculations, a simple method is proposed for obtaining a reasonable assessment of the peak stress. The efficiency of the different Anchorage details is discussed, and it is shown that the use of additional glued anchor plates gives the best results. These plates overcome the problem of Anchorage failure and enable the full theoretical flexural strength to be achieved, together with ductile behaviour.(a)
271 citations