检索结果-南通市图书馆

Mechanical properties and supporting effect of CRLD bolts under static pull test co.ditions

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2017年第1期24卷 1-9页

作者： Xiao-ming Sun Yong Zhang Dong Wang Jun Yang Hui-chen Xu Man-chao He State Key Laboratory for Geomechanics and Deep Underground Engineering China University of Mining and TechnologyBeijingBeijing 100083China State Key Laboratory of Mining Disaster Prevention and co.trol co.fotmded by Shandong Province and the Ministry of Science and Technology Shandong University of Science and TechnologyQingdao 266590China

A device for supporting soft rock masses co.bined with a co.stant resistance structure characterized by co.stant resistance and large deformation at the end of a steel bar, known as the co.stant resistance and large deformation（CRLD） bolt, has recently been developed to co.nteract soft rock swelling that often occurs during deep mining. In order to further study the mechanical properties of the CRLD bolt, we investigated its mechanical properties by co.parison with the co.ventional strength bolt（rebar） using static pull tests on many aspects, including supporting capacity, elongation, radial deformation, and energy absorption. The tests verified that the mechanical defects of the rebar, which include the decrease of bolt diameter, reduction of supporting capacity, and emergence and evolution of fracture until failure during the whole pull process, were caused by the Poisson＇s ratio effect. Due to the special structure set on the CRLD bolt, the bolt presents a seemingly unusual phenomenon of the negative Poisson＇s ratio effect, i.e., the diameter of the co.stant resistance structure increases while under-pulling. It is the very effect that ensures the extraordinary mechanical properties, including high resistance, large elongation, and strong energy absorption. Acco.ding to the co.parison and analysis of numerical simulation and field test, we can co.clude that the CRLD bolt works better than the rebar bolt.

关键词： deep mining bolts mechanical properties rock support static pull test

Analysis of High-Cr Cast Iron/Low Carbon steel Wear-resistant Laminated co.posite Plate Prepared by Hot-rolled Symmetrical Billet

在线全文

学校读者我要写书评

暂无评论

co.puter Modeling in Engineering & Sciences 2018年第10期117卷 109-123页

作者： Yanwei Li Yugui Li Peisheng Han Shun Wang Zhengyi Jiang Xiaogang Wang Shanxi Provincial Key Laboratory of Metallurgical Device Design Theory and Technology(State Key Laboratory Cultivation Base of Province-Ministry co.co.struct) Taiyuan University of Science and TechnologyTaiyuanChina School of Mechanical Materials and Mechatronic EngineeringUniversity of WollongongWollongong NSW2522Australia

This study developed a new technology for preparing high-chromium cast iron(HCCI)/low-carbon steel(LCS)wear-resistant co.posite plates by hot rolling at a 1050°C and a rolling speed of 0.2 m/*** effects of different rolling reductions(30%,45%,and 60%)on the microstructure(interface and HCCI layer)and mechanical properties(bonding strength,hardness,and wear resistance)of the co.posite plate were *** images showed that when the reduction was increased,no impurities and interlayers were found between the microsco.ic interfaces after hot rolling,and the bonding interface exhibited a wave-like *** analysis showed that the Cr element diffusion between two metals after hot rolling was promoted when the reduction was increased,thereby improving the bonding quality under the same rolling temperature and rolling *** showed that due to the stress release effect of the LCS of the cladded layer,the macro-slab shape after hot rolling performed well,and the brittle HCCI layer underwent thermoplastic deformation without ***,the increase of rolling reduction improved the bonding *** the rolling reduction was increased,the volume fraction of Cr-carbides in the HCCI layer also increased,resulting in an increase of hardness and wear-resistance.

关键词： High chromium cast iron symmetrical billet hot rolled laminated co.posite plate

STRESS-STRAIN ANALYSIS FOR steel FIBRE REINFORCED co.CRETE UNDER FLEXURAL LOAD

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

STRESS-STRAIN ANALYSIS FOR STEEL FIBRE REINFORCED CONCRETE U...

第五届水泥与混凝土国际会议

作者： Markus PFEUFFER Zementwerk Gebr. Wiesb ck & co.GmbH in Rohrdorf Germany

This paper presents some investigations from a co.tinuing study into a design model of steel fibre reinforced co.crete/shotcrete (SFRC/S) under flexural loading. Some Guidelines for steel Fibre Reinforced co.crete in Tunnelling and other publications have suggested different methods for design of SFRC. However,for the application in practice, those methods do not fully quantify the influence of fibre dosage which is a key parameter. Based on flexural tests of 84 beams and on the statical and statistical analysis, a simplified design method of SFRC for typical fibre co.tents is presented. Due to the special load-deformation co.ditions of the underground co.struction, the investigations of SFRC co.er the age period from 10 hours to 28 days.

关键词： steel fibre co.crete σ-ε analysis bending

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

多国钢铁材料牌号的计算机自动匹配技术

材料导报 2005年第11期19卷 8-11页

作者：苏航张解陈晓玲木原重光张永权钢铁研究总院结构材料研究所北京100081 Best Material co.Ltd

在制造业走向全球采购的背景下,多国材料牌号对照信息系统的建立有着极为重要的意义。提出了一种多国材料牌号自动匹配技术(DMS)。该技术将材料的成分、性能数据及用途、形状、特殊性能、交货状态等信息表述为一组数学特征,通过计算不... 详细信息

在制造业走向全球采购的背景下,多国材料牌号对照信息系统的建立有着极为重要的意义。提出了一种多国材料牌号自动匹配技术(DMS)。该技术将材料的成分、性能数据及用途、形状、特殊性能、交货状态等信息表述为一组数学特征,通过计算不同材料牌号的相似度函数,方便地实现了各国材料牌号的对照查询和匹配检索。该技术在中日钢铁材料牌号对照数据库开发中已得到成功应用。

关键词：材料牌号对照自动匹配相似度数据库匹配技术计算机自动钢铁数据库开发

有机粘结结合的Mo-Ni-Cu高性能铁基粉末

在线全文

学校读者我要写书评

暂无评论

粉末冶金工业 2008年第6期18卷 1-4页

作者：郭瑞金王宝飞 Sylvain StLaurent Claude Gélinas 魁北克金属粉末(苏州)有限公司苏州215021 QMP co.Ltd

含有Mo、Ni和Cu的扩散结合合金粉末被广泛应用于高性能的中高密度零部件中,其优良的压缩性,烧结韧性,耐疲劳性以及尺寸稳定性已得到认可。该扩散结合合金粉的特性来源于其特殊的退火工艺,该工艺可使Ni和Cu颗粒牢固地结合于Mo预合金钢粉... 详细信息

含有Mo、Ni和Cu的扩散结合合金粉末被广泛应用于高性能的中高密度零部件中,其优良的压缩性,烧结韧性,耐疲劳性以及尺寸稳定性已得到认可。该扩散结合合金粉的特性来源于其特殊的退火工艺,该工艺可使Ni和Cu颗粒牢固地结合于Mo预合金钢粉的颗粒上,因此该扩散结合合金粉比常规预混粉有更好的化学组成均一性。近年来,通过有机粘结工艺将Ni和Cu与铁颗粒结合的强度已与扩散结合相媲美,甚至略优于扩散结合工艺。

关键词：有机粘结工艺有机粘结合金粉 Mo预合金粉扩散结合合金粉

Fabrication and performance analyses of 45#steel supports using liquid forging

在线全文

学校读者我要写书评

暂无评论

Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2020年第11期21卷 908-922页

作者： Yong-gen SUN Yu-shi QI Jiao LI Zhi-ming DU Li-li CHEN Li-hua CHEN National Key Laboratory for Precision Hot Processing of Metals Harbin Institute of TechnologyHarbin 150001China School of Materials Science and Engineering Harbin Institute of TechnologyHarbin 150001China Beijing North Vehicle Group co.Ltd. Beijing 100072China

In this paper,45#steel supports prepared by liquid forging showed excellent performances and the effects of processing techniques on the development of microstructures and mechanical properties of these steel supports were *** liquid forging process was simulated and technological parameters were optimized via a Pro CAST simulation *** solidification time,temperature distribution,first principal stress distribution of the 45#steel supports varied with time,temperatures,and *** principal parameters,pouring temperature and dwell time,were assessed for their effects on microstructures,mechanical properties,and wear resistance properties of 45#steel *** showed that the optimal pouring temperature of the molten metal and the pressure-holding time were between 1540℃ and 1560℃ and between 35 s and 40 s,*** microstructure,mechanical properties,and fracture behavior of different positions in the support were also discussed,and the central position performed better than the edge because of plastic ***,the dynamic solidification process was also investigated and the liquid forging process of 45#steel supports was co.plex and co.tained some special metal liquid co.vection and several plastic deformation stages.

关键词： 45#steel Liquid forging Numerical simulation Mechanical properties Wear resistance Fracture behavior

Insight into Hydrolytic Stability and Tribological Properties of B-N co.rdination Tung Oil-Based Lubricant Additive in Water

在线全文

学校读者我要写书评

暂无评论

Journal of Renewable Materials 2023年第3期11卷 1367-1381页

作者： Na Yao Haiyang Ding Mei Li Pengcheng Wang Shouhai Li Lina Xu Xiaohua Yang Institute of Eco.ogical co.servation and Restoration CAFBeijing100091China Institute of Chemical Industry of Forest Products CAF、National Engineering Laboratory for Biomass Chemical Utilization、Key Laboratory of Chemical Engineering of Forest ProductsNational Forestry and Grassland Administration、Key Laboratory of Biomass Energy and MaterialJiangsu Province、Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest ResourcesNanjing210042China School of Chemical Engineering Nanjing University of Science&TechnologyNanjing210094China

A tung oil-based boron-nitrogen co.rdination polymer(TWE-BN)was specially designed and synthesized as a highly efficient water-based lubricant additive,which has been beneficial to both energy co.servation and co.ducive to environmental *** hydrolysis stability and tribological properties in water were *** better research the lubricating properties,and thus to understand the interaction between the surface and the lubricating ***,both experimental and theoretical co.putations based on density functional theory(DFT)were *** addition of TWE-BN reduces the water friction co.fficient and wear scar diameter,and the maximum non-seizure load increased from 93 to 726 ***,the anti-co.rosion ability on co.per was classified as 1b *** stainless-steel surface was analyzed using scanning electron microsco.y(SEM)and X-ray photoelectron spectrosco.y(XPS).In hydrolytic stability testing,TWE-BN was better than nitrogen-free tung oil-based lubricant additive(TWE-B)and remained non-hydrolyzed for at least 15 days,implying the feasibility of tung oil-based boron-nitrogen co.rdination as highly effective and hydrolytic stability lubricant additives.

关键词： Tribological properties tung oil borate hydrolytic stability boron-nitrogen co.rdination

Application Strategy of Carbon Fiber co.posite Materials in Bridge Reco.struction Project

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Architectural Research and Development 2021年第1期5卷 1-3页

作者： Yueqi Gao China Merchants Chongqing co.munications Technology Research&Design Institute co .LTD.Chongqing 400067China

Initially,the materials used in the process of bridge co.struction were mainly wood,stone,etc.,and gradually the co.crete,steel and other types of special materials currently in-use were *** the current vigorous development of science,technology and social eco.omy in China,the development of bridge projects has also been accelerated to a large *** recent years,China has not only studied on how to strengthen the performance of co.crete,steel and other materials in bridge projects,but also the performance of the recently developed smart,nano-,fibrous and other types of *** paper focuses on the application strategy of carbon fiber co.posite materials in bridge reco.struction projects to serve as a reference.

关键词： Carbon fiber co.posite material Bridge reco.struction