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The influence of jaw's curvature on the results of the Brazilian disc test 预览
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作者 Ch.F.Markides S.K.Kourkoulis 《岩石力学与岩土工程学报:英文版》 CSCD 2016年第2期127-146,共20页
The general contact problem of a disc squeezed between jaws of arbitrary curvature is consideredemploying Muskhelishvili's complex potentials. Taking advantage of the general solution introduced, theclosed-form expre... The general contact problem of a disc squeezed between jaws of arbitrary curvature is consideredemploying Muskhelishvili's complex potentials. Taking advantage of the general solution introduced, theclosed-form expressions for the stresses along strategic loci (loaded rim, loaded diameter, disc's center)are obtained, in terms of the ratio r of the disc's to the jaw's curvature. Then, the effect of r (as well asthat of the relative stiffness of the disc's and jaw's materials dictating the contact arc) on the stressdistribution along these loci is explored. It is concluded that, for both smooth contact (zero friction) andcontact with friction, the role of the jaw's curvature is significant not only along the disc-jaw contact arc(as it could be expected), but also all along the loaded diameter. On the other hand, it is indicated that thestress field at the disc's center is more or less insensitive to the jaw's curvature assuming that r lieswithin the range (0, 0.67) or in other words within the limits defined by the two standardized suggestions,i.e. that of American Society for Testing and Materials (ASTM) (plane loading platens with r ?0)and that of International Society for Rock Mechanics (ISRM) (curved jaws with r ?0.67). The upper limitof this range is a kind of compromise between the need to make the stress field at the disc's centerindependent of the boundary conditions while keeping at the same time the contact angle large enoughto reduce the stress concentration and the risk for premature fracture initiation far from the disc's center.For jaws with radius of curvature exceeded by that suggested by ISRM, the stress field at the disc's centeris significantly influenced. Especially for jaws with radius approaching that of the disc, the stress field atthe disc's center is dramatically distorted rendering Hondros' formula inapplicable and the test resultserroneous. 展开更多
关键词 BRAZILIAN DISC TEST Elastic contact Complex POTENTIALS Stress field Frictional stresses
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Mechanical behavior of colonic anastomosis in experimental settings as a measure of wound repair and tissue integrity 预览
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作者 Konstantinos A EKmeKtzoglou Georgios C Zografos +5 位作者 Stavros K Kourkoulis Ismene A Dontas Panagiotis K Giannopoulos Katerina A Marinou Maria V Poulakou Despina N Perrea 《世界胃肠病学杂志:英文版(电子版)》 SCIE CAS CSCD 2006年第35期5668-5673,共6页
瞄准:为了在试验性的背景并且因此决定吻合的结肠的织物的机械性质,给愈合弯屈的一项措施。方法:36 只男 Wistar 老鼠被用作吻合织物正直的试验性的模型。在第 5 手术后的天,牵引韧力被轴的力量的申请测量,提供吻合裂开和漏的一项... 瞄准:为了在试验性的背景并且因此决定吻合的结肠的织物的机械性质,给愈合弯屈的一项措施。方法:36 只男 Wistar 老鼠被用作吻合织物正直的试验性的模型。在第 5 手术后的天,牵引韧力被轴的力量的申请测量,提供吻合裂开和漏的一项量的措施。结果:是的负担的图时间的功能[ P = P (t)]并且排水量另外作为时间的功能[三角洲 s =三角洲 s (t)]为每测试被记录,允许负担对关于吻合失败的批评的值提供重要数据的排水量图和thus 的设计。量的数据有关控制的吻合力量被获得标本(健康老鼠) ,以及从为比较的非健康的老鼠的标本。结论:这个试验性的模型提供测量吻合力量的一个优秀方法。尽管有使用的标本的相对小数字,这个方法提供测量创伤修理的一个精确方法。更试验性的大小需要被表现到相互关联出现牵引韧力价值到吻合失败。 展开更多
关键词 机械行为 结肠吻合术 实验研究 组织结构
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