Results 101 to 110 of about 15,411 (192)
距踝关节的三维有限元分析——足球踝发生的生物力学特点 [PDF]
, 2013 目的:应用三维有限元的计算分析方法,研究踝关节在不同体位、不同载荷的条件下,距踝关节软骨表面的应力变量,揭示足球踝发生的生物力学规律。方法:将正常男性足踝部的CT扫描数据,导入三维建模软件建立几何模型后,进行有限元网格划分。分析踝关节在跖屈45°、35°体位下,远距离和近距离踢球时,距骨表面的应力分布数据。结果:①成功创立踝关节跖屈45°、35°两组三维有限元模型。前者:220876个节点,1280039个单元,后者:178163个节点,1036740个单元。②经计算得到踝关节4种工况的von ...
刘露梅 +4 more
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Failure mechanism and controlling measures of cut slope instability at Shouling temple, Luhuo County, Sichuan Province [PDF]
The Shouling temple in Luhuo County, Sichuan faces an urgent situation due to the construction of the Future Hall. A five-level excavation slope with a height of 21.8 m and a slope angle of 55° to 75° was formed on the northwest side of the site, leading
Gang LUO, Heming REN, Xingzheng WANG
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Jianzhu Gangjiegou Jinzhan型钢混凝土组合结构中采用超高性能混凝土（ultra-high performance concrete，UHPC）可以提高承载能力、减小截面尺寸，同时改善其因密集配置箍筋和剪力件而导致的施工复杂等问题。目前型钢UHPC组合梁有限元仿真研究主要集中在受弯性能参数化定性分析，忽略了型钢与UHPC间的黏结滑移，缺少对其界面黏结性能和组合效应的评估，对受拉区UHPC的受力性能也缺乏深度讨论。对型钢UHPC组合梁开展基于Abaqus的受弯性能有限元仿真分析，对UHPC强度、型钢强度 ...
沈德建 +4 more
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Optimization analysis of ingate supporting structure under the condition of thick loose layer and thin bedrock [PDF]
Aiming at the technical problems of ingate support under the condition of thick loose layer and thin bedrock, taking ingate of Dongfeng Well in Qinan Mine as the engineering background, we analyzed the original support design scheme by using FLAC3D, and ...
Chengtao LI +4 more
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Main control factors of rock burst and its disaster evolution mechanism [PDF]
With the gradual transfer of shallow coal mining to deep coal mining in China, the rock burst disasters are becoming an increasingly serious problem. In the process of rock burst mechanism cognition to rock burst prevention engineering, the primary task ...
Deyuan FAN +6 more
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Dianci bileiqi, 1982 本文以锥形头部的悬式绝缘子为主要对象,讨论了在热机试验时瓷件头部承受机械应力、温度应力、残余应力、局部应力集中的情况,介绍了热机试验装置的概况、热机试验方法及其试验结果,并对试验结果进行了分析,最后提出了提高悬式绝缘子热机性能的几点意见。
魏光大, 曾明求
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, 1995 以中间相萘沥青(AR树脂)和各向同性煤沥青(ICP)为原料,系统研究了沥青原料性质与由其制备的碳纤维结构、性能之间的关系。研究表明,AR树脂中的一维有序中间相结构在纺丝中被拉伸,形成不同中间相间的界面,成为应力集中区,在后续碳化过程因应力释放导致纤维开裂而损害其力学性能;而ICP沥青基本为无定形相结构,在纺丝过程中无明显的择优取向,碳化过程石墨化程度低,故其所成的碳纤维无应力集中和开裂问题,但也正是这无定形结构,使其最终力学性能也较差。以上结果说明,原料的性质可以"遗传"到沥青基碳纤维中。因此 ...
刘安华 +4 more
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Three-dimensional pressure-relief prevention and control technology and its application in deep gob-side entry [PDF]
In response to the challenges posed by significant deformation and maintenance difficulties in the surrounding rock of deep gob-side entries. This study focuses on the 7312 head entry as the research background.
Changqing LI +6 more
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大跨空间结构X型方钢管相贯节点应力集中分析 Stress Concentration Analysis of the X-Type Steel Pipe’s Joints
, 2018 张颖, 雷宏刚, 闫亚杰, 邱斌
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Jianzhu Gangjiegou Jinzhan在钢结构建筑和桥梁中，为保证主次梁上翼缘对齐，次梁的梁端往往需要切角。在地震、风或温度等作用下，次梁中会出现轴力，从而影响其受力情况。当前关于切角梁在考虑轴力作用下的承载性能仍然缺乏系统研究，因此，本文旨在研究单切角梁在考虑轴力作用下的承载性能。设计并开展了4根足尺单切角梁的静力加载试验，并使用有限元软件对试件进行了深入分析，着重研究了切口区域轴力对承载力的影响。结果表明：所有试件破坏形式均为切口区域腹板局部屈曲破坏；轴向压力会加剧切口区域的应力集中效应，导致切口区域内主压应力增大 ...
杨金奇, 张茗渊, 贺修樟, 柯珂
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