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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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Journal ArticleDOI
TL;DR: In this paper, the combined effect of corrosion and sustained loads on the structural performance of nine reinforced concrete (RC) beams (each measuring 152 x 254 x 3200 mm) was investigated, and the presence of flexural cracks during corrosion exposure significantly reduced the time to corrosion cracking and slightly increased the corrosion crack width.
Abstract: Research is needed to clarify the interaction between the degree of corrosion, the corrosion crack width, and the load carrying capacity in the presence of a sustained load in reinforced concrete (RC) beams having well-anchored steel reinforcement. This article reports on a study that investigated the combined effect of corrosion and sustained loads on the structural performance of nine RC beams (each measuring 152 x 254 x 3200 mm). One beam was tested as a virgin while eight beams were exposed to accelerated corrosion for up to 310 days using an impressed current technique. Four beams were corroded under a sustained load that corresponded to approximately 60% of the yield load of the virgin beam. The four remaining beams were kept unloaded during the corrosion exposure. Test results showed that the presence of a sustained load and associated flexural cracks during corrosion exposure significantly reduced the time to corrosion cracking and slightly increased the corrosion crack width. The presence of flexural cracks during corrosion exposure initially increased the steel mass loss rate and, consequently, the reduction in the beam strength. As time progressed, no correlation between the reduction in the beam strength and the presence of flexural cracks was observed.

204 citations

Journal ArticleDOI
TL;DR: In this paper, the microstructures, secondary phases, and grain boundaries were characterized using a range of analytical techniques including TEM, SEM, AES, and XRD, and the fracture toughness was derived either from bend tests of beam-shaped samples with a controlled surface flaw or from standard disk-shaped compact-tension specimens precracked in cyclic fatigue.
Abstract: “In situ toughened” silicon carbides, containing Al, B, and C additives, were prepared by hot pressing. Densification, phase transformations, and microstructural development were described. The microstructures, secondary phases, and grain boundaries were characterized using a range of analytical techniques including TEM, SEM, AES, and XRD. The modulus of rupture was determined from fourpoint bend tests, while the fracture toughness was derived either from bend tests of beam-shaped samples with a controlled surface flaw, or from standard disk-shaped compact-tension specimens precracked in cyclic fatigue. The R-curve behavior of an in situ toughened SiC was also examined. A steady-state toughness over 9 MPa·m1/2 was recorded for the silicon carbide prepared with minimal additives under optimum processing conditions. This increase in fracture toughness, more than a factor of three compared to that of a commercial SiC, was achieved while maintaining a bend strength of 650 MPa. The mechanical properties were found to be related to a microstructure in which platelike grain development had been promoted and where crack bridging by intact grains was a principal source of toughening.

204 citations

Journal ArticleDOI
TL;DR: In this paper, the authors present the mechanics associated with the short-term behavior of glass-fiber reinforced-plastic (GFRP) box beams that include a layer of concrete and a carbon-fibre reinforcedplastic laminate in the compression and the tension zone, respectively.
Abstract: The study presents the mechanics associated with the short-term behavior of glass-fiber reinforced-plastic (GFRP) box beams that include a layer of concrete and a carbon-fiber–reinforced-plastic laminate (CFRP) in the compression and the tension zone, respectively. This innovative concept results in cost-effective composite members with pseudoductile characteristics and high stiffness and strength properties. It can be thought of as a better way of producing composite structural members for simply supported spans, through an automated manufacturing technique such as pultrusion. The analytical results are verified by a series of bending tests on large-scale specimens and by the finite-element technique. The agreement between experiments and analysis was found quite satisfactory. A preliminary design procedure for the hybrid members is also presented, based on a complete set of stiffness, strength (flexural strength, web shear failure by either crushing or buckling, lateral instability), and ductility desig...

204 citations

Journal ArticleDOI
TL;DR: In this paper, the authors investigated the mechanical properties of recycled concrete aggregate (RCA) produced by adding chopped basalt fibers (BF) with contents of 0.1, 0.3, 1, and 1.5%.

204 citations

Journal ArticleDOI
TL;DR: In this paper, a fully dense ZrB2 ceramic containing 10% ultra-fine SiC particulate was successfully hot pressed at 1900°C for 20min and 40-50 MPa of applied pressure.
Abstract: A fully dense ZrB2 ceramic containing 10 vol. % ultra-fine α-SiC particulate was successfully hot pressed at 1900 °C for 20 min and 40–50 MPa of applied pressure. Faceted ZrB2 grains (average size ≈3 μm) and SiC particles dispersed regularly characterized the base material. No extra secondary phases were found. The introduction of the ultra-fine α-SiC particulate was recognized as the key factor that enabled both the control of the diboride grain growth and the achievement of full density. The mechanical properties offered an interesting combination of data: 4.8±0.2 MPa $\surd{m}$ fracture toughness, 507±4 GPa Young’s modulus, 0.12 Poisson’sratio, and 835±35 MPa flexural strength at room temperature. The flexural strength measured at 1500 °C (in air) provided values of 300±35 MPa. The incorporated ultra-fine α-SiC particulate was fundamental, sinterability apart, to enhancing the strength and oxidation resistance of ZrB2. The latter property was tested at 1450 °C for 20 h in flowing dry air. In such oxidizing conditions, the formation of a thin external borosilicate glassy coating supplied partial protection for the faces of the material exposed to the hot environment. The oxidation attack penetrated into the material’s bulk and created a 200-μm-thick zirconia scale. The SiC particulate included in the oxide scale, lost by active oxidation, left carbon-based inclusions in the formerly occupied sites.

204 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20243
20233,785
20226,968
20213,940
20203,386
20193,138