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Sid Ali Kaoua Kamel Taibi Nacera Benghanem Krimo Azouaoui Mohammed Azzaz 《Applied Mathematical Modelling》2011,35(3):1378-1387
This paper presents a 3D geometric modelling of a twin helical spring and its finite element analysis to study the spring mechanical behaviour under tensile axial loading. The spiralled shape graphic design is achieved through the use of Computer Aided Design (CAD) tools, of which a finite element model is generated. Thus, a 3D 18-dof pentaedric elements are employed to discretise the complex “wired-shape” of the spring, allowing the analysis of the mechanical response of the twin spiralled helical spring under an axial load. The study provides a clear match between the evolution of the theoretical and the numerical tensile and compression normal stresses, being of sinusoidal behaviour. The overall equivalent stress isovalues increases radially from 0° to 180°, being maximal on the internal radial zone at the section 180°. On the other hand, the minimum stress level is located in the centre of the filament cross section. 相似文献
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Sébastien Balieu Krimo ToutahLaura Carro Lise-Marie ChamoreauHélène Rousselière Christine Courillon 《Tetrahedron letters》2011,52(22):2876-2880
A straightforward formation of six- and eight-membered rings via the radical cyclization of specifically designed ynamides is reported. This strategy provides a protoberberine analog in only three steps by a radical cyclization cascade. 相似文献
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