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.

Development of AFM-based techniques to measure mechanical properties of nanoscale structures

Abstract: Mechanical property evaluation of nanometer-sized structures is necessary to help design reliable MEMS/NEMS devices. Most material properties are known to exhibit dependence on specimen size and such properties of nanoscale structures are not well characterized. Silicon and SiO 2 nanometer-scale beams (nanobeams) with a 6 μm length and widths ranging from 200 to 600 nm were fabricated using lithography-based techniques. A quasi-static bending test technique for these nanobeams was developed using an atomic force microscope (AFM). This technique was used to evaluate elastic modulus, bending strength and estimate fracture toughness of the beams and beam materials. The beams failed in a linear elastic and brittle manner. Results indicate that elastic modulus and fracture toughness values are comparable to bulk values, whereas bending strength appears to be much higher for these nanobeams than for larger scale specimens, thus revealing a size effect. We also report results from monotonic cyclic loading tests of the nanobeams that reveal nanoscale fatigue performance of the beam materials. SEM observations of the fracture surfaces suggest cleavage as the fracture mechanism for both Si and SiO 2 beams.

On relationships between the mechanical properties of recycled aggregate concrete: An overview

Abstract: In this paper, a detailed investigation is conducted to analyze the relationships between the mechanical properties of recycled aggregate concrete (RAC). Based on a large number of experimental results published worldwide in literature from 1985 to 2004, an experimental database is developed with regard to the main mechanical properties of RAC. In particular, the relations between the compressive strength, the density, the splitting tensile strength, the flexural strength, and the elastic modulus are investigated and discussed in detail. It is found that the interrelationships between the mechanical properties of RAC could be quite different from those of normal concrete. Some improved new equations are proposed for the prediction of the relations between the mechanical properties of RAC based on the statistical regression analysis with the least squares method.

Wood Fibre Reinforced Polypropylene Composites: Effect of Fibre Geometry and Coupling Agent on Physico-Mechanical Properties

Abstract: Wood fibre reinforced polypropylene composites at fibre content 50% by weight have been prepared and different types of wood fibres (hard wood fibre, soft wood fibre, long wood fibre and wood chips) were treated with coupling agent (MAH-PP) to increase the interfacial adhesion with the matrix to improve the dispersion of the particles and to decrease the water sorption properties of the final composite. The present study investigated the tensile, flexural, charpy impact and impact properties of wood fibre reinforced polypropylene composites as a function of coupling agent and fibre length and structure. From the results it is observed that wood chips-PP composites showed better tensile and flexural properties comparative with the other wood fibre-PP composites with the addition of 5%MAH-PP, which is around 65% and 50% for tensile strength and flexural strength respectively. Hard wood fibre-PP composites showed better impact characteristic values comparative to other wood fibre-PP composites with the addition of 5%MAH-PP and damping index decreased about to 60%. Charpy impact strength also increased up to 60% with the addition of 5%MAH-PP for long wood fibre-PP composites. Water absorption and scanning electron microscopy of the composites are also investigated.