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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TL;DR: In this paper, the effectiveness of carbon fiber reinforced polymers (CFRP) sheets as a flexural repair system for Reinforced Concrete (RC) beams is evaluated by monitoring the flexural stiffness recovery.
32 citations
TL;DR: In this paper, the authors investigated Langmuir films at the water surface using grazing-incidence diffuse X-ray scattering and found that the surface tension measured with X-rays is consistent with the Wilhelmy plate measurements, at least for tilted phases.
Abstract: We have investigated Langmuir films at the water surface using grazing-incidence diffuse X-ray scattering. We show that beyond structural parameters like the film thickness and density, diffuse scattering also gives access to phase transitions and elastic properties (surface tension and bending rigidity). We find that the surface tension measured with X-rays is consistent with the Wilhelmy plate measurements, at least for tilted phases. The bending rigidity is found to be on the order of 20–30kBT whatever the phase. The underlying molecular mechanisms are discussed using different models.
32 citations
TL;DR: In this paper, an experimental study conducted to characterize the effect of corrosion and sustained load on structural behavior of reinforced concrete (RC) beam was conducted to evaluate the effects of loading level on corrosion of reinforcing steel, the flexural deflection and residual loading capacity of the test beams.
32 citations
TL;DR: In this article, a novel composite material is described, where tension, applied to polymeric fibres, is released prior to molding them into a matrix and compressive stresses imparted by the viscoelastically strained fibres improve mechanical properties.
Abstract: A novel composite material is described, where tension, applied to polymeric fibres, is released prior to moulding them into a matrix. On matrix solidification, compressive stresses imparted by the viscoelastically strained fibres improve mechanical properties. Previous studies showed that these viscoelastically prestressed composites had improved impact and tensile properties compared with control (unstressed) counterparts. In the current study, three-point bend tests on composites using nylon 6,6 fibre reinforcement in epoxy and polyester resins have demonstrated that the viscoelastic prestressing effect increases flexural stiffness. From deflections at 5 s and 900 s, using a freely suspended load on large span/thickness ratio ( L / h ) samples, the flexural modulus was increased by ∼50% relative to control counterparts. Stiffness-increasing mechanisms relating to pre-tensioned fibre and matrix prestress effects are discussed. For small L / h samples (using controlled rate deflection up to ∼5 s), the flexural modulus and resulting increase from viscoelastic prestressing were lower. This is attributed to shear effects and possibly fibre–matrix load transfer mechanisms. By exploiting time–temperature superposition, all samples were aged to the equivalent of 100 years at 20 °C and subsequent bend tests revealed no significant change in the modulus increase resulting from viscoelastic prestressing.
32 citations
32 citations