2,048 research outputs found
A review of the finite strip method
No full textThe first paper on finite strip analysis of structures was published by Cheung in the late 1960s. Since then, many more papers have been published and they have demonstrated that the finite strip method has higher efficiency than the finite element method as a smaller number of degrees of freedom are involved in the solution. As a recently published book by Cheung and Tham has reported a comprehensive review on papers published before 996, the present article will focus mainly on the publications in the past three years but references are also made to some key papers published earlier
Analysis of coupled shear/core walls using a beam-type finite element
No full textThe Sisodiya and Cheung so-called beam-type element, which was originally developed for bridge analysis, had been successfully adapted by Cheung to apply to coupled shear/core wall structures. This element is not afflicted by shear locking and has rotational degrees-of-freedom for direct connection with the coupling beams. Moreover, the definition adopted for each of its rotations is the vertical fibre rotation which, as Kwan recently found, is the only definition that can ensure compatibility between the beam and wall elements. In this paper, further studies on the application of this element are carried out and improvements, which can lead; firstly, to higher computational efficiency of the method; secondly, enable more reasonable shear stress results to be obtained, and finally, allow the maximum bending stress to be determined for practical design purpose without using a fine mesh, are proposed. Numerical examples are given to demonstrate the improvements achieved. © 1994.link_to_subscribed_fulltex
Timing Measurement Platform for Arbitrary Black-Box Circuits Based on Transition Probability
No full text03.06.13 KB. Ok to add the author version to Spira
A rigorous analytical method for doubly periodic cylindrical inclusions under longitudinal shear and its application
No full textAn infinite elastic solid containing a doubly periodic parallelogrammic array of cylindrical inclusions under longitudinal shear is studied. A rigorous and effective analytical method for exact solution is developed by using Eshelby's equivalent inclusion concept integrated with the new results from the doubly quasi-periodic Riemann boundary value problems. Numerical results show the dependence of the stress concentrations in such heterogeneous materials on the periodic microstructure parameters. The overall longitudinal shear modulus of composites with periodic distributed fibers is also studied. Several problems of practical importance, such as those of doubly periodic holes or rigid inclusions, singly periodic inclusions and single inclusion, are solved or resolved as special cases. The present method can provide benchmark results for other numerical and approximate methods. (C) 2003 Elsevier Ltd. All rights reserved
A generalized self-consistent method accounting for fiber section shape
No full textA three-phase confocal elliptical cylinder model is proposed for fiber-reinforced composites, in terms of which a generalized self-consistent method is developed for fiber-reinforced composites accounting for variations in fiber section shapes and randomness in fiber section orientation. The reasonableness of the fiber distribution function in the present model is shown. The dilute, self-consistent, differential and Mori-Tanaka methods are also extended to consider randomness in fiber section orientation in a statistical sense. A full comparison is made between various micromechanics methods and with the Hashin and Shtrikman's bounds. The present method provides convergent and reasonable results for a full range of variations in fiber section shapes (from circular fibers to ribbons), for a complete spectrum of the fiber volume fraction (from 0 to 1, and the latter limit shows the correct asymptotic behavior in the fully packed case) and for extreme types of the inclusion phases (from voids to rigid inclusions). A very different dependence of the five effective moduli on fiber section shapes is theoretically predicted, and it provides a reasonable explanation on the poor correlation between previous theory and experiment in the case of longitudinal shear modulus
Analysis of thin parallelogram plates' bending by spline-finite-strip method
No full textSpline finite strip has been successfully applied in solving right plates and shells by Cheung et al in 1982. In this paper, the method is extended to the analysis of parallelogram plate. This extension still retains the banded nature of the spline finite strip and only small amount of extra computing effort is required. Furthermore, the discretisation error of the above method is established theoretically as a general case for the spline finite strip method. © 1984 HUST Press.link_to_subscribed_fulltex
Die “ek” in (‘YK’): Die desentralisasie van die subjek in Breyten Breytenbach se digbundel (‘YK’)
No full textIn Breyten Breytenbach’s poetry the “I” is complex. “I” and “you”, the writer and the reader, are not represented with constituted meanings but as signifiers and as part of language production. This article reflects on the development process of the writer as the textual “I”, the “I” narrator in the poetic text – the “I” of language that is not homogeneous or constant. The text is regarded as a pluriform in dialogue (often incomplete) with a variety of texts, the writer and his text, the texts of the reader and the texts of society and history. The author discusses the decentralisation of the subject in Breytenbach’s poetry with respect to his prison collection (‘YK’), and especially the poem “nekra” (a neologism recalling “necro”)
Bending of skew plates by spline-finite-strip method
No full textSpline finite strip was devised by Cheung et al. in 1982 [1]. Unlike the standard finite element method, this method employs B-3spline function for interpolation in one direction and local Hermite cubic polynomial in the other direction. The general form of displacement function is given as their product. Extensive numerical examples on right plates and shells were well documented by Cheung et al. [1]. but the applicability of this method in the analysis of skew plates remains unexplored. The main theme of the present paper is to generalize the technique to include parallelogram plates. As this extension still retains the banded nature, only a small amount of extra computing effort is required. The convergence of the method is established and it is supported by numerous examples of different loading and support conditions. It has shown that spline finite strip method, which requires less variables for interpolation, can achieve the same order of accuracy as the conforming finite element. © 1986.link_to_subscribed_fulltex
Analysis and Reconstruction of Shipwreck YK 11 (c. Seventh Century A.D.) from the Theodosian Harbor at Yenikapı in Istanbul, Turkey
No full textSince 2004, the Istanbul Archaeological Museums have conducted salvage archaeological excavations at the construction site of an underground railway station at Yenikapı in Istanbul, Turkey. These excavations have unearthed the remains of Constantinople’s Theodosian Harbor (Portus Theodosiacus), including 36 Byzantine shipwrecks. The detailed study of eight of these wrecks was allocated to a small international team under the direction of Cemal Pulak from the Institute of Nautical Archaeology (INA) at Texas A&M University. One of these shipwrecks, YK 11, was a small, heavily-repaired, pine-built merchantman abandoned as a derelict at the western end of the harbor early in the seventh century. This dissertation serves as a detailed record of the YK 11 hull remains, provides a theoretical reconstruction of the vessel, compares the ship’s construction with that of contemporaneous vessels, and explores the ship’s historical context.
The YK 11 hull was excavated, dismantled, and removed from the construction zone at Yenikapı in 2008. The author conducted the post-excavation documentation of the ship’s timbers between 2009 and 2012, following methods established by Fred van Doorninck and J. Richard Steffy of INA in their work with Mediterranean shipwrecks. This documentation revealed that YK 11 had undergone a series of significant repairs over the ship’s lifetime. In these repairs, much of the ship’s original planking, edge fastened with unpegged mortise-and-tenon joints below the waterline, was replaced with planks lacking edge fasteners; a considerable number of the ship’s frames were also replaced. These repairs to YK 11 significantly complicated the interpretation of its original construction.
The paucity of edge fasteners, presence of caulking, and attachment of frames to the keel might be taken as evidence that YK 11 was built after a skeleton-based tradition. However, with the detailed documentation of each component timber, a careful analysis of fastening patterns, the identification of repairs, and a thorough study of the preserved surface detail, it is clear that YK 11, although exhibiting evidence of both shell-first and skeleton-first techniques, was initially designed and built as a primarily shell-based vessel. As such, this study of YK 11 contributes valuable new information toward a better understanding of the transition from shell-based to skeleton-based shipbuilding in the Mediterranean
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