Topic
Flexural rigidity
About: Flexural rigidity is a research topic. Over the lifetime, 3829 publications have been published within this topic receiving 56780 citations.
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27 Jul 2000TL;DR: In this paper, a power transmission shaft to be used mainly in vehicles comprises metal joint elements and a metal pipe connected to each other, and a fiber reinforced plastic pipe having a large flexural modulus of elasticity is inserted into the metal pipe, thus forming a composite FRP shaft having flexural rigidity sufficient to serve as a Power Transmission Shaft.
Abstract: A power transmission shaft to be used mainly in vehicles comprises metal joint elements and a metal pipe connected to each other. A fiber reinforced plastic pipe having a large flexural modulus of elasticity is inserted into the metal pipe, thus forming a composite FRP shaft having flexural rigidity sufficient to serve as a power transmission shaft.
72 citations
TL;DR: In this article, two types of steel energy dissipators are proposed: one includes a reduced section plate restrained by two flat plates, and the other uses cross-shaped steel plates.
72 citations
TL;DR: Weinbaum et al. as mentioned in this paper reported additional experiments and apply large deformation theory for elastica to describe the restoration of the fibres in a Brinkman medium which absorbs fluid as the ESL expands.
Abstract: There is wide interest in the role of the endothelial surface layer (ESL) in transmitting blood shear stress to the intracellular cytoskeleton of the endothelial cell. However, very little is known about the mechanical properties of the glycocalyx or the flexural rigidity of the core proteins that comprise it. Vink, Duling & Spaan ( FASEB J. , vol. 13, 1999, p. A 11) measured the time-dependent restoration of the ESL after it had been nearly completely compressed by the passage of a white blood cell (WBC) in a tightly fitting capillary. Using this initial experiment, Weinbaum et al. ( Proc. Natl. Acad. Sci. USA , vol. 100, 2003, p. 7988) predicted that the core proteins have a flexural rigidity EI of 700 pN nm $^{2}$ , which is $\sim$ 1/20 the measured value for an actin filament. However, their analysis assumes small deflections and only the fibre motion is considered. In the present paper we report additional experiments and apply large-deformation theory for ‘elastica’ to describe the restoration of the fibres in a Brinkman medium which absorbs fluid as the ESL expands. We find that there are two phases in the fibre recoil: an initial phase for large compressions where the ESL thickness is $ its undisturbed thickness, and the ends of the fibres overlap and are parallel to the capillary wall; and a second phase where the fibres assume a shape that is close to the solutions for an elastic bar with linearly distributed vertical loading. The predicted time-dependent change in thickness of the ESL provides remarkably good agreement with experiment and yields an estimate of 490 pN nm $^{2}$ for the flexural rigidity EI of the core protein fibres, which is unexpectedly close to that predicted by the linear theory in Weinbaum et al. (2003).
72 citations
TL;DR: A simple mechanical model is presented for the resulting highly nonlinear elastic response of the dumbbell construct and the flexural rigidities of the microfilaments that were found by fitting the model to the experimentally observed force-distance curves.
Abstract: The micrometer-scale length of some protein polymers allows them to be mechanically manipulated in single-molecule experiments This provides a direct way to measure persistence length We have use
71 citations
TL;DR: In this article, the authors measured the flexural rigidity of microtubules using a laser trapping technique and dark-field microscopy and found that the values of flexural stiffness for these deformations were between 10-25 and 10-23 Nm2 as measured for the 5-25 µm length microtubule.
Abstract: Microtubules, which are flexible biopolymers, can be used for nanotechnology applications (e.g., nano-actuator) as they have a rigidity similar to that of plexyglass and other plastic materials. The flexural rigidity, or bending stiffness, of microtubules was measured using a laser trapping technique and dark-field microscopy. One end of a microtubule rod was chemically bound to a glass microsphere, while the other end was bound to a silica glass substrate. Then, the microsphere was laser-trapped and manipulated to exert three different deformation modes on the microtubule. The values of flexural rigidity for these deformations were between 10-25 and 10-23 Nm2 as measured for the 5–25 µm length microtubules. The origin of the length dependence of the flexural rigidity of microtubules is discussed.
70 citations