Flexural rigidity

About: Flexural rigidity is a research topic. Over the lifetime, 3829 publications have been published within this topic receiving 56780 citations.

Flexural rigidity of Fennoscandia inferred from the postglacial uplift

Abstract: The Earth's response to glacial loading/unloading offers exceptional promise for the study of the physical properties of the lithosphere. In particular, tilting of paleoshorelines is very sensitive to the lithosphere rigidity. To determine the flexural rigidity, the isostatic response to deglaciation in Fennoscandia is modeled using an Earth model with a layered mantle viscosity overlain by an elastic lithosphere. The flexural rigidity and asthenosphere viscosity is allowed to vary to get a match between theoretical and observed present rate of uplift and tilting of paleoshorelines. Five different ice thickness models are used. For a relatively thin ice (2500 m in central areas) the resulting flexural rigidity is more or less uniform over Fennoscandia, with a value of 1023 N m (elastic thickness te ≈ 20 km). This is regarded as minimum for the flexural rigidity of central Fennoscandia. The pattern of the present rate of uplift and the tilts of the paleoshorelines of the area also sets an upper bound of the flexural rigidity, 2.5 × 1025 N m (te ≈ 110 km) in more central areas of Fennoscandia. The flexural rigidity at the western coast of Norway does not seem to exceed 1023 N m (te ≈ 50 km). The most likely glacier model gives a flexural rigidity of 1023 N m (te ≈ 20 km) at the Norwegian coast, increasing to above 1024 N m (te ≈ 50 km) in central parts of Fennoscandia.

Mechanical properties of polypropylene mesh used in pelvic floor repair

Abstract: The aim of this study was the comparison of the stiffness of different meshes under two types of mechanical tests Five different mesh types were mechanically tested The methods used consisted on uniaxial tension test (tensile stiffness) and tape ring tests, experimental continuous compression of the mesh loops (flexural stiffness) The most significant difference of tensile stiffness behaviour appears between Aris™ and TVTO™ From the analysis of the experimental data, we divided the flexural stiffness, in two main groups The first group includes Auto Suture™ and Aris™ meshes The two meshes seem to have a similar flexural behaviour The second group includes TVTO™, Uretex™ and Avaulta™ The difference between these two groups is clearly evident comparing TVTO™ and Aris™ This study shows that there are significant differences on the mechanical properties between urogynecology meshes

Predictive model for the detection of out-of-plane defects formed during textile-composite manufacture

Abstract: A hybrid finite element model using a discrete mesoscopic approach was previously developed and has since demonstrated its ability to capture the tensile and shear behaviors of textile reinforcements for composites. The aim of the present research is to implement flexural properties into a non-homogenous beam/shell model such that the formation and shape of out-of-plane defects can be well predicted. A method for linking the measurement of bending rigidity to the determination of a compressive modulus is presented and simulations are used to demonstrate the ability of the modeling approach to predict the amplitude and curvature of out-of-plane waves. A comparison of the simulation results to experimental data shows the finite element model accurately captures this out-of-plane phenomenon.

Quantification of the Young's modulus of the primary plant cell wall using Bending-Lab-On-Chip (BLOC).

Abstract: Biomechanical and mathematical modeling of plant developmental processes requires quantitative information about the structural and mechanical properties of living cells, tissues and cellular components. A crucial mechanical property of plant cells is the mechanical stiffness or Young's modulus of its cell wall. Measuring this property in situ at single cell wall level is technically challenging. Here, a bending test is implemented in a chip, called Bending-Lab-On-a-Chip (BLOC), to quantify this biomechanical property for a widely investigated cellular model system, the pollen tube. Pollen along with culture medium is introduced into a microfluidic chip and the growing pollen tube is exposed to a bending force created through fluid loading. The flexural rigidity of the pollen tube and the Young's modulus of the cell wall are estimated through finite element modeling of the observed fluid-structure interaction. An average value of 350 MPa was experimentally estimated for the Young's modulus in longitudinal direction of the cell wall of Camellia pollen tubes. This value is in agreement with the result of an independent method based on cellular shrinkage after plasmolysis and with the mechanical properties of in vitro reconstituted cellulose-callose material.

Analytical Study on Bending Effects in a Stay Cable with a Damper

Abstract: The effects of bending on the modal properties of a stay cable with a transverse damper are analytically studied. Considering that the value of the flexural rigidity in the stay cable is small in practice, an explicit asymptotic formula for the modal damping of a cable with a general type of damper is derived. For a viscous damper, the asymptotic formula obtained is compact, accurate, and thus is very suitable for practical design. Furthermore, for the first few vibration modes of interest, the asymptotic solution is independent of the modal index. It is shown that flexure in the cable reduces the maximum attainable modal damping, possibly up to 20%, while it significantly increases the optimal damping coefficient of the damper.