Deflection (engineering)

About: Deflection (engineering) is a research topic. Over the lifetime, 30862 publications have been published within this topic receiving 298849 citations.

Low velocity flexural impact behavior of AR glass fabric reinforced cement composites

Abstract: Fabric–cement composites developed using the pultrusion production process have demonstrated impressive tensile and flexural properties. For instance fabric reinforced composites with bonded Alkali Resistant (AR) glass fabrics exhibit strain-hardening behavior, tensile strength in the range of 20–25 MPa, and strain capacity of the order of 2–5% under static conditions. Properties of these composite systems were investigated under three point bending conditions using an instrumented drop weight impact system. Samples were studied from the viewpoint of the variations of impact load, deflection response, acceleration and absorbed energy. Development of the testing system in terms of components and acceleration response are discussed in detail. Methods of the impact load measurement using three different ways of acceleration response, piezoelectric load washer and conventional strain gage based load cell are discussed. Cement composites with two different fabric contents and four different drop heights of hammer (dropping mass) were tested. Experimental results indicate that for the same drop height, the stiffer beam type specimens have a lower ultimate deflection but a higher load carrying capacity than the plate type specimens. The maximum flexural stress and absorbed energy of composites increase with drop height. In beam specimens, complete fracture does not take place as cracks form and close due to rebound and significant microcracking in the form of radial fan cracking is observed, whereas interlaminar shear is the dominant failure mode in the plate specimens.

Nanoindentation models and Young's modulus of monolayer graphene: A molecular dynamics study

Abstract: We studied the nanoindentation of monolayer graphene by molecular dynamics simulations. It is found that the response of graphene to indentation is deflection dependent. In small deflection range, the response obeys point load model, while large-deflection indentation follows the sphere load model. Hence, we proposed to make sectional fittings and use different response models in different deflection ranges. In this way, a consistent Young's modulus is obtained that is almost independent of the size ratio of intender to graphene and the pretensions of graphene. The calculated Young's modulus is about 1.00 TPa, in good agreement with the experiments.

Full-Scale Measurement of Akashi-Kaikyo Bridge during Typhoon

Abstract: Full-scale measurement data observed on the Akashi–Kaikyo Bridge during strong typhoons were analyzed. Power spectral density and spatial correlation of longitudinal velocity fluctuations were analyzed. PSD was well represented by Hino’s formula by changing the scaling parameter. Spatial correlation at two points was well represented not by the exponential formula but by an alternative coherence function based on isotropic turbulence theory. Decay factor in the exponential formula showed a weakly increasing trend with the increase in distance and wind speed. Bridge response of deck lateral deflection was also analyzed. Static deflection at winds with normal to the bridge axis was in good agreement with the analytical value. Gust factors of deck lateral deflection were mostly less than design specification.