泡沫铝的单向压缩行为及其吸能性

在SUNS电子万能材料试验机上对国产工业用泡沫铝材料进行准静态单向压缩试验，分析试件尺寸、材料相对密度及泡孔尺寸对材料静态压缩性能及吸能性能的影响。结果表明，在准静态条件下，泡沫铝泡孔孔径越大，弹性模量与塑性模量越小、屈服强度越大．但当相对密度超过32％后，塑性压垮强度却因泡孔孔径增大而降低，弹性模量在相对密度约为30％时出现拐点。孔径大吸能效率高。试件高度减小，压缩应力-应变曲线中的塑性平台长度缩短，且当试件高度小于10mm肘，塑性压垮强度明显提高。理想吸能效率最大值随试件高度增加而提高。泡沫铝微结构中的微缺陷引起材料压缩性能的降低。     

低强度相似材料性能指标双因素方差分析

为了研究低强度相似材料性能与相似材料配比因素之间的关系,根据相似材料配比试验结果,确定了上横山矿床硅质页岩、含钒页岩和炭质页岩相似材料的合理配比,分别为8(37)、9(64)、10(37),通过双因素方差分析方法,重点分析相似材料配比因素中砂胶比和水膏比两个因素对低强度相似材料性能指标的影响。试验结果表明,砂胶比对相似材料的密度、单轴抗压强度、弹性模量和泊松比均有高度显著影响;水膏比对材料的密度和弹性模量有高度显著影响,而对材料的泊松比影响不显著。通过双因素方差分析确定对低强度相似材料力学参数影响较显著的因素,进而控制相似材料参数,避免了选择低强度相似材料的误选、误判,有利于提高试验效率。     

飞车重型单侧移动布料车的设计

根据尾矿及废石的处理工艺,设计了飞车重型单侧移动布料车。将该设备与移置带式输送机相结合,悬臂输送机的设计显著减少了移置式输送机的移置次数,减小了占用空间,降低了运行成本,提高了使用效率,适应矿山复杂的地势环境和布料需求。对主要零部件进行仿真分析,找出部件的主要受力大小、分布和变形状态,进行合理的选材,最大限度降低制造成本。     

无烟煤在冲击载荷下破坏模式与强度特性

大直径单轴分离式霍普金森压杆试验表明：无烟煤在冲击载荷作用下,存在一个门槛速度4.3 m/s。这个门槛值为提高无烟煤块率,进行生产系统、储运系统改造优化等方面提供了可参考数量依据。根据试验曲线的特征,无烟煤具有显著的应变软化和应变硬化特征,初始弹性模量、屈服强度与极限强度都随着应变率的增加而提高,屈服强度最为显著。无烟煤在冲击载荷作用下破坏分为4种类型：压剪破坏、拉应力破坏、张应变破坏和卸载破坏,并以拉应力破坏、张应变破坏和卸载破坏为主要破坏形式。     

车身用5182铝合金板成形极限研究

基于M-K理论,分别结合Hill79和Logan-Hosford屈服准则构建成形极限预测模型,导入5182铝合金材料参数,分析板料初始厚度不均匀度、指数参数对其成形极限曲线的影响; 通过结合非接触式应变测量系统的Marciniak胀形实验采集5182铝合金板料极限应变数据,并与预测成形曲线进行对比。结果表明,当板料初始厚度不均匀度为0.97时,基于M-K模型结合Hill79屈服准则的预测曲线与实验结果的符合度为94.09%。     

齿轮材料的选择及热处理

介绍了齿轮工作中的失效形式和性能要求。针对钢制齿轮,根据齿轮工作时载荷的大小,转速的高低及齿轮的精度,分析了齿轮材料的选择和相应的热处理工艺。同时还介绍了钢制齿轮常用的热处理方法,最后论述了典型零件的选材及工艺路线。     

西鞍山花岗岩三轴压缩变形破坏与能量特征分析

利用微机伺服岩石三轴试验机对取自西鞍山铁矿的花岗岩进行5组不同围压下的常规三轴压缩实验,绘制了不同围压下花岗岩的全应力-应变曲线,并系统地分析了花岗岩的屈服强度、抗压强度与围压的关系。从能量角度研究了岩石的变形破坏过程,讨论了峰前极限应变能密度和峰前弹性应变能密度的比例关系,分析了花岗岩峰前极限应变能密度、峰前弹性应变能密度、峰前耗散能密度的围压效应,发现花岗岩的峰前极限应变能密度和峰前弹性应变能密度均与试验围压呈良好的正线性关系;通过线弹性能判据方法对储备大量弹性应变能的硬质脆性花岗岩岩体进行岩爆预测,得出该花岗岩所处矿体有强烈岩爆倾向的结论。     

钢丝绳弹性性能的建模与测量研究

将钢丝绳作为一种连续介质材料来分析,建立起力学求解模型,采用了名义材料性能与实际材料性能的换算方法。以力学模型和换算方法为指导,设计了弹性性能测试实验,得到了具体钢丝绳在受轴向张力和径向压力作用下的轴向弹性模量、正交弹性模量及泊松比。     

基于极限承载法的矿山铺面设计

对井下无轨车辅助运输的铺面设计问题进行了研究,提出了基于极限承载理论的设计方法,给出了等效接触面积、等效接触压力、等效静轴载及铺面承载能力的简化计算公式,并引入了安全系数控制铺面破坏时的变形,求出了合理的铺面厚度．该设计方法避开了弹性模量和泊松比这2个难以量化的参数,采用容易获取的材料内摩擦角和黏聚力参数,使其更便于应用．     

悬臂式采矿车越障性能研究

研究了悬臂式铰接结构采矿车的越障机理, 分析了悬臂位置对采矿车越障性能的影响。使用按比例缩小的实验车数据, 计算了不同悬臂位置参数下的极限越障坡度, 同时根据计算结果, 对相关参数进行了优化; 建立了基于优化后的结构参数的实验车虚拟样机系统, 并对该虚拟样机的越障过程进行了仿真分析。研究表明, 摩擦系数μ=0.4时, 该实验车可越过极限坡度为50°、垂直高度大于车轮直径的障碍物。结构参数优化后, 其越障极限坡度可达65°。     

China rare earth market review

正November 21~30,2014Due to weak demand from downstream industries,transactions of rare earth in Chinese domestic market were inactive.It was difficult to sell any rare earth products except for dysprosium oxide and terbium oxide.Suppliers lost confidence in recent market.Demand for rare earth products was soft.Consumers continued to take a wait-and-see attitude.Rare earth export market remained slow.     

Current situation and future trend of China rare earth luminescent materialindustry(continued)

<正>Developing ecological lighting source The world is facing the big problem of energy shortage today and the contradiction between economy development and environmental protection is worsened.Therefore,people are more likely to choose an ecological light source that is more energy efficient and environmental friendly.The choice provides great opportunity for the development of rare earth optical material industry in China.The concept of green lighting positions rare earth luminescent material as a leading player in illumination market.The light source of both rare earth luminescent lamp and LED lamp is ecological and energy saving.This is why     

Galaxy Magnets achieved the net profit of 34.02 million yuan in the first six months of 2014

正Galaxy Magnet announced its financial results for the first half of 2014 on August 14.For the first six months ended on 30 June 2014,Galaxy Magnet achieved operation income of RMB 182.3 million,up8.40% over the same period of 2013,and the net profit attributable to the shareholders of the listed company of 34.02 million yuan,increasing 35.49% over the same period of last year.Stable performance increase was led by development of new customers and application market of magnets.     

Rare Earth Application in Steel in China

<正>China has rich rare earth resources.Output of rare earth and steel in China ranks the top first in the world.However,there is still certain distance between the steel produced in China and developed countries from the point of varieties and quality.China still has to import some types of steel.Improving the quality should be emphasiZed in future development of steel industry in China.Rare earth can be used to upgrade traditional steel     

稀散金属产业的观察与思考

分析了近年来国内外稀散金属产业的生产、应用、资源与市场状况.铟锡氧化物靶材、砷化镓晶片、锗红外材料、铼高温合金和硒在电解锰及玻璃的应用等已成为稀散金属的主要应用领域.稀散金属的产量快速增长达到历史高位而导致了市场的失衡.以GaInP_2/GaAs/Ge,CIGS和CdTe为代表的非硅系太阳能电池是稀散金属的新兴应用领域,将给稀散金属带来日益增长的需求.     

China rare earth market review

正November 1~10,2014Chinese rare earth market was still inactive.Demand for rare earth products was weak.Consumers took a wait-and-see attitude for lower price.As it was an off season for rare earth products,it was expected that prices of rare earth could continue turbulence at the bottom in short terms.Due to a sharp drop,demand for rare earth from downstream recovered.Affected by new energy vehicles,wind powder and energy-efficient appliances,production of rare earth permanent     

China rare earth market review

正August 1~10,2014 There was some good news in rare earth industry recently.Restructuring plans of rare earth groups led by Baotou IronSteel Group and Xiamen Tungsten Group respectively have been approved by MIIT.And rare earth storage policy,which had been expected for a very long time,has been launched officially.Pushed by the good news,rare earth price started to rebound since August 5.Price of didymium oxide and dysprosium oxide rose about 1% to 2%,averagely.About 10% of     

China rare earth market review

正July 1~10,2014Due to weak demand from downstream industry and slow transactions,rare earth market remained weak and price of rare earth products continued to decline.There was no sign of recovery in downstream market.The market of NdFeB magnetic materials and phosphor was depressed.Catalyst,     

New energy vehicle:an opportunity for rare earth magnets

<正>Extracted from Securities Guide 1.Popularity of new energy vehicles—an irresistible market trend1.1 Progress of new energy vehicles Chinese Premier Li Keqiang said recently on a visit to Xi'an BYD Autos that new energy vehicles,especially new energy bus,can lessen environment and noise pollution.He encouraged the use of new     

Brief news

正Corun invested another 50 million yuan in power battery for HEV Hunan Corun announced on 27 June that they had signed the cooperation agreement to jointly built Corun(Shaoxing)Autos Power Battery System Co.,Ltd.in Shaoxing Binhai New City.According to the announcement,total registered