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sample size effect on the dynamic torsional behaviour of the 2A12 aluminium alloy

Theoretical & Applied Mechanics Letters 2017年第6期7卷 317-324页

作者： J.H.Chen W.F.Xu R.Z.Xie F.J.Zhang W.J.Hu X.C.Huang G.Chen Institute of Systems Engineering China Academy of Engineering PhysicsMianyangSichuan 621999China

In order to investigate the effect of sample size on the dynamic torsional behaviour of the 2A12 aluminium alloy. In this paper, torsional split Hopkinson bar tests are conducted on this alloy with different sample dimensions. It is found that with the decreasing gauge length and thickness, the tested yield strength increases. However, the sample innerlouter diameter has little effect on the dynamic torsional behaviour. Based on the finite element method, the stress states in the alloy with different sample sizes are analysed. Due to the effect of stress concentration zone （SCZ）, the shorter sample has a higher yield stress. Furthermore, the stress distributes more uniformly in the thinner sample, which leads to the higher tested yield stress. According to the experimental and simulation analysis, some suggestions on choosing the sample size are given as well.

关键词： Torsional split Hopkinson bar Dynamic torsion sample size effect Finite element analysis Stress distribution

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Morphological Variation in the Martinican Subspecies White-Breasted Thrasher (<i>Ramphocinclus brachyurus brachyurus</i>)

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Open Journal of Animal Sciences 2022年第1期12卷 1-15页

作者： Steven Philippe Son Thomas Alexandrine Sébastien Motreuil Daniel Imbert Jean-Raphaël Gros-Désormeaux Laboratoire Caribéen de Sciences Sociales Faculté de Droit et d’Economie Martinique France Université des Antilles Site de Guadeloupe Campus de Fouillole Guadeloupe France Parc naturel de Martinique Martinique France Centre national de la Recherche Scientifique Université de Bourgogne Dijon France

The White-breasted Thrasher (Ramphocinclus brachyurus) is the smallest passerine bird in the Mimids family. Ranked as “endangered” in the IUCN list, the demographic distribution of this species is spread unevenly across two islands in the Lesser Antilles. The Saint-Lucian subspecies, Ramphocinclus brachyurus sanctaeluciae, was estimated to number between 1200 and 1700 individuals, whereas the Martinique subspecies, Ramphocinclus brachyurus brachyurus, was estimated at between 200 and 400 individuals. As an endemic rare species with a high risk of extinction, the Martinique subspecies should be regarded as a conservation priority. The small size of the Martinique subspecies population, its restricted geographical range, and its narrow habitat tolerance make it quite difficult to study. The variability of morphological traits in this subspecies has not been biostatistically analyzed recently. In order to update knowledge and fill in any gaps, we have used the morphometric approach to study the morphological variability of the Martinique subspecies. The study site is a small peninsula located in the northeast of the island of Martiniqu

关键词： Caribbean Endemic Rare Species Morphological Measurements sample size effect Sexual Dimorphism Subspecies

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