Flexural rigidity

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

Factors affecting tooth movement in sliding mechanics.

Abstract: The force system operating between bracket and wire in sliding mechanics has been examined analytically using simple beam theory with the object of providing further information on the cause of bracket binding. The results were checked on an enlarged model system, and satisfactory agreement between experiment and theory was obtained. It is shown that for a given bracket tip the restoring couple varies not only with the flexural rigidity (El) of the wire, the bracket width and span length, but also with the position of the bracket along the span. In addition, as tipping occurs a net vertical force is brought into play which is initially intrusive, but becomes extrusive as retraction proceeds.

An investigation of the flexural performance of bamboo-concrete composite beams with precast light concrete slabs and dowel connectors

Abstract: Bamboo-concrete composite (BCC) beam is an attractive structural system due to the synergistic use of bamboo and concrete components. To reduce the weight and achieve industrial production of such beams, this paper presents a novel BCC beam with precast lightweight concrete slab , which could be referred to as an assembled bamboo-lightweight concrete composite (ABLCC) beam or semi-ABLCC beam. In this paper, the shear performance of an ABLCC connection system was investigated first. The experimental variables include the diameter of the dowels and the manufacturing processes of the specimens. The test results showed that the ABLCC connection system had a similar shear strength but a higher stiffness than the cast-in-place bamboo-lightweight concrete composite (PBLCC) connection system. Increasing the diameter of the dowels improved the shear capacity of the systems. Then the flexural performance of ABLCC beams was investigated. Experimental parameters, including the diameter of the dowels, the spacing of the dowels, and the manufacturing processes of the specimens, were taken into consideration in the bending tests . The failure mode of the ABLCC beams was tensile fractures of the bamboo fibers at the bottom of the beam and crushing of the concrete under the loading point. The ABLCC beams had remarkable properties in terms of the bending capacity and flexural stiffness , which were 1.49–1.96 times and 2.18–3.47 times higher than those of the bamboo beams, and 1.11 times and 1.09 times higher than those of the PBLCC beams, respectively. The bending capacity, flexural stiffness and combination efficiency of the ABLCC beams decreased with increasing dowel spacing. The results of analytical methodologies used to predict the mid-span deflection of the ABLCC beams were in good agreement with the test results.

A Model for Fabric Buckling in Shear

Abstract: A mathematical model is presented for the buckling of fabric under combined shear and tensile forces. This model takes account of the anisotropic characteristics of the fabric in terms of the flexural rigidities in the warp and weft directions, its corresponding Poisson's ratios, the shear modulus, and the width to height ratio of the rectangular specimen. Numerical solutions show that the critical shear force at which buckling starts and the number of buckles increase with increasing pre-tension. Furthermore, as the height or width of the rectangular specimen decreases, the critical shear force increases. For most fabrics where the flexural rigidity in the warp direction is higher than that in the weft direction, the results suggest that during tailoring, it is beneficial to orient the fabric so that the tension is in the warp direction to reduce the possibility of shear buckling in the garment.