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.

Thickness‐Shear and Flexural Vibrations of Crystal Plates

Abstract: The theory of flexural motions of elastic plates, including the effects of rotatory inertia and shear, is extended to crystal plates. The equations are solved approximately for the case of rectangular plates excited by thickness‐shear deformation parallel to one edge. Results of computations of resonant frequencies of rectangular, AT‐cut, quartz plates are shown and compared with experimental data. Simple algebraic formulas are obtained relating frequency, dimensions, and crystal properties for resonances of special interest in design.

Chemical, Physical, and Mechanical Characterization of Isocyanate Cross-linked Amine-Modified Silica Aerogels

Abstract: We describe a new mechanically strong lightweight porous composite material obtained by encapsulating the skeletal framework of amine-modified silica aerogels with polyurea. The conformal polymer coating preserves the mesoporous structure of the underlying silica framework and the thermal conductivity remains low at 0.041 plus or minus 0.001 W m(sup -1 K(sup -1). The potential of the new cross-linked silica aerogels for load-carrying applications was determined through characterization of their mechanical behavior under compression, three-point bending, and dynamic mechanical analysis (DMA). A primary glass transition temperature of 130 C was identified through DMA. At room temperature, results indicate a hyperfoam behavior where in compression cross-linked aerogels are linearly elastic under small strains (less than 4%) and then exhibit yield behavior (until 40% strain), followed by densification and inelastic hardening. At room temperature the compressive Young's modulus and the Poisson's ratio were determined to be 129 plus or minus 8 MPa and 0.18, respectively, while the strain at ultimate failure is 77% and the average specific compressive stress at ultimate failure is 3.89 x 10(exp 5) N m kg(sup -1). The specific flexural strength is 2.16 x 10(exp 4) N m kg(sup -1). Effects on the compressive behavior of strain rate and low temperature were also evaluated.

Bond of Fiber-Reinforced Polymer Laminates to Concrete

Abstract: Fiber-reinforced polymer (FRP) laminates are being successfully used for strengthening existing reinforced concrete structures. The bond of FRP reinforcement to the concrete substrate is of great importance for the effectiveness of this technique. In this research, flexural test specimens were prepared to address some of the factors expected to affect bond such as bonded length, concrete strength, number of plies (stiffness), ply width, and, to a lesser extent, surface preparation. Experimental results are presented and discussed. A linear bond stress-slip relationship, along with a simple shear model for the evaluation of the slip modulus, is used to predict the strain distribution at moderate load levels. Lastly, expressions of the peeling load and the effective bond length are provided. A design equation is proposed for calculating the effective FRP ultimate strain to be used in design to account for bond-controlled failure.