Flexural rigidity

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

Bending Behavior of Woven Fabrics with Vertical Seams

Abstract: This paper presents a study of the bending properties of fabric strips with vertical plain seam. The "second moment of area" of a seamed cross section determines the bending behavior of such a strip. Fabric thickness, seam thickness, distance of the neutral axis from the surface of the cross section, and seam allowance width are involved. Various woven fabrics with different seam allowances are investigated. Bending length and bending rigidity obtained from the experimental results are highly related to the second moment of area of the seamed fabric cross section.

A numerical modeling for eigenvibration analysis of honeycomb sandwich panels

Abstract: The eigenvibration properties of honeycomb sandwich panels are investigated in this paper. A new numerical modeling for eigenvibration analysis of the honeycomb sandwich panels is proposed under the assumption that the orthotropic shell and two kinds of beam elements represent face materials, adhesive layers and honeycomb core, respectively. The shell element is also connected to the beam element through the thickness. The effects of geometry of honeycomb core and thickness of face material on the eigenfrequency are examined through the comparisons between finite element simulation and experimental results. It is shown as a result that the eigenvibration properties depend strongly on the face material rigidity and honeycomb core geometry. The implications of the findings for the design of eigenvibration of honeycomb sandwich panels are discussed from the point of view of overall flexural rigidity.

Sheet material discrimination apparatus, sheet material information output apparatus, and image forming apparatus

Abstract: Provided is a sheet material discrimination apparatus including: an impact force applying member for colliding with the surface of a sheet material, an impact force receiving member for receiving the impact force applying member through the sheet material, a detecting unit for outputting an electric signal corresponding to an impact force received by the impact force receiving member, and a cushioning material for absorbing the impact force transmitted to the detecting unit, wherein a support member having a bending rigidity higher than the bending rigidity of the detecting unit with respect to the impact force is arranged between the detecting unit and the cushioning material.

On a high-potential variable-stiffness device

Abstract: There are great efforts in developing effective composite structures for lightweight constructions for nearly every field of engineering. This concerns for example aeronautics, but also automotive industry and energy harvesting applications. Modern concepts of lightweight components try to use structures with adjustable properties. However, classic composite materials can only slightly adapt to varying environmental conditions because most materials, like carbon- or glass-fiber composites, show properties which are time-constant and not changeable. This contribution describes the development, the potential and the limitations of novel smart, self-controlling structures which can change their mechanical properties—in particular their flexural stiffness—by more than one order of magnitude. These structures use a multi-layer approach consisting of a ten-layer stack of 0.75 mm thick polycarbonate layers. The set-up is analytically described and its mechanical behavior is predicted by finite element analysis performed with ABAQUS. The individual layers are braided together by an array of shape memory alloy wires, which can be activated either all together or independently. Depending on the temperature applied by an electrical current flowing through the wires and the corresponding contraction, the wires can control the area moment of inertia of the whole stack, and with it the bending stiffness. First experimental investigations have shown a maximum stiffness change by a factor of 60, which is close to the theoretically predicted value.