Topic
Deflection (engineering)
About: Deflection (engineering) is a research topic. Over the lifetime, 30862 publications have been published within this topic receiving 298849 citations.
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TL;DR: In this paper, a low noise cantilever deflection sensor with a deflection noise density of 17fm∕Hz was developed by optimizing the parameters used in optical beam deflection (OBD) method.
Abstract: We have developed a low noise cantilever deflection sensor with a deflection noise density of 17fm∕Hz by optimizing the parameters used in optical beam deflection (OBD) method. Using this sensor, we have developed a multienvironment frequency-modulation atomic force microscope (FM-AFM) that can achieve true molecular resolution in various environments such as in moderate vacuum, air, and liquid. The low noise characteristic of the deflection sensor makes it possible to obtain a maximum frequency sensitivity limited by the thermal Brownian motion of the cantilever in every environment. In this paper, the major noise sources in OBD method are discussed in both theoretical and experimental aspects. The excellent noise performance of the deflection sensor is demonstrated in deflection and frequency measurements. True molecular-resolution FM-AFM images of a polydiacetylene single crystal taken in vacuum, air, and water are presented.
355 citations
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TL;DR: In this paper, a large-scale, four-story, single bay steel plate shear wall specimen with unstiffened panels was tested using controlled cyclic loading to determine its behavior under an idealized severe earthquake event.
Abstract: A large-scale, four-story, single bay steel plate shear wall specimen with unstiffened panels was tested using controlled cyclic loading to determine its behavior under an idealized severe earthquake event. The shear wall had moment-resisting beam-to-column connections, resulting in a lateral load-resisting system that possesses an inherent redundancy. Gravity loads were applied at the top of the wall and equal horizontal loads were applied at the four floor levels. The specimen endured 30 cycles of loading during the test, of which 20 cycles were in the inelastic range. Prior to failure of the specimen, the deflection reached in the lowest story was nine times the yield deflection. The test specimen proved to be initially very stiff, showed excellent ductility and energy dissipation characteristics, and exhibited stable behavior at very large deformations and after many cycles of loading. A description of the test setup, loading procedures, and specimen behavior is presented.
346 citations
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344 citations
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TL;DR: In this article, an analytic solution for the coupled large deflection of plates and shallow shells made of functionally graded materials (FGMs) under transverse mechanical loads and a temperature field is provided.
342 citations
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TL;DR: In this paper, a non-classical (non-local) nanobeam model incorporating the length scale parameter (nonlocal parameter) which can capture the small scale effect is proposed.
336 citations