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35 个结果
  • 简介:论文为计算焊接失真给出当代的途径的短概述。以便遇见存在挑战,为在大结构焊接失真的预言的一个先进混合模型被描述。为说明这个模型的能力的目的,一个模拟盒子被放进讨论。结果被比较与试验性的数据,以及与普通模拟技术验证。计算费用的分析也被介绍。基于介绍模型,为计算技术的开发的方向也被建议。

  • 标签: 混合模型 焊接变形 变形预测 大型结构 模拟技术 计算成本
  • 简介:我们为预言有弹性的moduli开发了一个大形变模型oftwo维的细胞的材料。这个大形变模型基于细胞的材料的房间的使倾向的成员的大挠度。使倾向的成员,代表性的结构的紧张和二的有弹性的moduli的偏转--维的细胞的材料用不完全的椭圆形的积分被表示。试验性的结果证明这些有弹性的moduli不再是全体的常数变丑,但是与thes火车显著地变化。比较在这个大形变模型之间被做,小变丑模特儿由吉布森和Ashby求婚了。

  • 标签: 二维多孔材料 塑性变形模型 弹性模数 结构 挠度
  • 简介:StudiesontheZnO/La0.5Pr0.2Sr0.3MnO3(LPSMO)/SrNb0.002Ti0.998O3(SNTO)heterostructurehavingvaryingthicknessofp-typeLPSMO(100nm—LP1)and(200nm—LP2)manganitearecarriedout.ZnO/LPSMO(n—p)andLPSMO/SNTO(p—n)junctionsofboththeheterostructuresexhibitgoodrectifyingbehaviorinawiderangeoftemperatureandappliedfield.Forwardandreversebiascharacteristicsofboththejunctionsofheterostructuresshowoppositebehavior.Theobservationofnegativemagnetoresistance(MR)at5KandpositiveMRat300K,inboththeheterostructures,hasbeenexplainedinthecontextofinterfaceregioneffectsandfillingofenergybandsofLPSMOmanganite.Further,athightemperature,theheterostructuresexhibitlargetemperature(46%K-1)andfield(40%T-1)sensitivities.Dependenceoftransport,magnetotransport,I—Vandsensingpropertiesoftheheterostructures,onthetemperature,fieldandfilmthicknesseshavebeendiscussedinthiscommunication.

  • 标签: 异质结构 磁场灵敏度 锰氧化物 正温度 MR SNTO
  • 简介:煤苍蝇灰是为精力生产在煤的燃烧期间产生的一个工业副产品。由于增加煤电源的年度消费和煤苍蝇灰的严肃的潜在的环境威胁,关于煤苍蝇灰的利用的研究的可观的数量全球被承担了。玻璃化似乎是为再使用这工业废物的最有希望的选择之一。这篇论文作为原料用煤苍蝇灰给出唯一的高效眼镜陶艺的生产的短概述。对为从煤苍蝇灰和主要水晶阶段,相应性质和那些材料的可能的用法的眼镜陶艺的合成的方法论的详细描述被介绍。调查揭示了那变换的煤苍蝇灰进高效眼镜陶器的材料是一条有希望的新途径改进这个工业副产品的利用。这变换不仅与处理减轻这些问题而且把废物材料变换成高增值可销售的商品。

  • 标签: 微晶玻璃 粉煤灰 利用率 工业副产品 高性能玻璃 制作
  • 简介:CONTENTSA:Physicsofmetalandmetallography(36-46)B:Testingandanalysis(7)C:Mechanical,physicalandchemicalproperties(58-74)D:Metallurgy(46-61)E:Metalworking(31-50)90A0036PlasticDeformationandDislocationStructureInγ′-phaseofaDirectionallySolidifiedNi-baseSuperalloyThedislocationsubstructureofdirectionallysolidifiedRene80

  • 标签: MARTENSITE TETRAGONAL SOLIDIFIED ANNEALING hinder sizes
  • 简介:A:Physicsofmetalandmetallography(68-78)B:Testingandanalysis(27-28)C:Mechanical,physicalandchemicalproperties(64-78)D:Metallurgy(111-141)E:Metalworking(50-59)89A0068ObservationofEpitaxialOverlayerofMetalsatAtomicLevelEpitaxialoverlayerofmetalsatatomiclevelhasbeensuccessfully

  • 标签: Atomic TOUGHNESS BORON Observation hardened heating
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  • 简介:Thelargesize,crack-freeZr55Cu30Al10Ni5bulkmetallicglass(BMGs)withthediameterof54mmandtheheightof15mmwasbuiltbylasersolidformingadditivemanufacturingtechnology,whosesizeislargerthanthecriticaldiameterbycasting.Themicrostructure,tensileandcompressivedeformationbehaviorsandfracturemorphologyoflasersolidformedZr55Cu30Al10Ni5BMGswereinvestigated.Itisfoundthatthecrystallizationmainlyoccursintheheat-affectedzonesofdepositionlayers,whichconsistofAl5Ni3Zr2,NiZr2,ZrCu,CuZr2phases.Thecontentofamorphousphaseinthedepositisabout63%.Underthecompressiveloading,thedepositpresentsnoplasticitybeforefractureoccurs.Thefractureprocessismainlycontrolledbytheshearstressandthecompressiveshearfractureanglesofabout39.Thecompressivestrengthreaches1452MPa,whichisequivalenttothatofas-CastZr55Cu30Al10Ni5BMGs,andthereexistvein-likepatterns,river-likepatternsandsmoothregionsatthecompressivefractography.Underthetensileloading,thedepositpresentsthebrittlefracturepatternwithoutplasticdeformation.Thefractureprocessexhibitsnormalfracturemodel,andthetensileshearfractureangleofabout90°.Thetensilestrengthisonlyabout609MPa,andthetensilefractographymainlyconsistsofmicro-scaledcoresandvein-likepatterns,dimple-likepatterns,chocolate-likepatternsandsmoothregions.Theresultsfurtherverifiedthefeasibilityandlargepotentialoflaseradditivemanufacturingonfabricationandindustrialapplicationoflarge-scaleBMGsparts.

  • 标签: Zr-based BULK metallic glass Laser solid
  • 简介:AdditivelymanufacturedTi-6Al-4Vlatticestructureshavefoundimportantnicheapplications.However,theyoftenshowinsufficientcompressiveductilityorinsufficientstructuralintegrity.Inthisstudy,abatchof45octahedralTi-6Al-4Vlatticestructureswasmanufacturedinthreedifferentstrutdiameters(0.5,1.0,1.5mm)byselectiveelectronbeammelting(SEBM).Theinfluenceofpost-SEBMannealingonthecompressivedeformationcharacteristicsofthelatticestructurewasinvestigated.Theas-builtTi-6AI-4Vlatticesfragmentedwhenthecompressivestrainreached13%-23%dependingonstrutdiameter.Annealingat950℃(Ptransustemperature:995℃)onlyslightlyimprovedthecompressiveductilityofthelatticestructures.However,annealingat1050℃(p-annealing)fundamentallychangedthecompressivedeformationmodeofthelatticestructures.Theresultantcompressivestress-straincurvewasfeaturedbyalongsmoothplateauandnofactureoccurredevenaftersignificantdensificationofthelatticestructurehadtakenplace(>50%ofcompressivestrain).

  • 标签: Selective electron beam MELTING TI-6AL-4V LATTICE
  • 简介:在这研究,极其细小颗粒(UFG)冷滚动制作的6061艾尔合金是磨擦促使(FSW)与在两表情下面的不同旋转率冷却焊接并且在水里的快速的冷却。400的Low-heat-input参数?水(400水)里的rpm旋转率能有效地禁止重新使结晶的谷物变粗,减少降水率,并且保留UFG6061艾尔父母金属的更多的脱臼。400水关节显示出高低坚硬的价值,狭窄的低坚硬的地区,和高张力的力量,归因于脱臼的效果,谷物边界,稳固答案,并且降水变硬。这个工作提供有效策略由与大变丑和low-heat-inputFSW的冷滚动制作大尺寸的体积艾尔·乌夫格合金。

  • 标签: 铝合金 小颗粒 大体积 滚动 磨擦 焊接
  • 简介:参考测试方法平行地被执行,借助于化学分析,X光检查衍射,微分扫描calorimetry-thermogravimetry,扫描电子显微镜学和当面学习C4A3S的形成的极化的光显微镜和起核心作用的代理人的缺席。当tricalcium硅酸盐(C3S)显然支持C4A3S和增加desulfurization度的形成,结果与高钙和低热消费显示出那个起核心作用的代理人。在锻烧与C3S做的未加工的饭期间,没有C3S,C4A3S的谷物尺寸与那相比是更大的。并且在一样的锻烧水平,集体损失和热,消费属于CaCO3分解被减少。

  • 标签: 成核剂 S形 C4A3S X射线衍射仪 差示扫描量热 硅酸三钙
  • 简介:利用水热合成法制备了C-S-H凝胶,重点研究了不同的制备工艺、原材料与钙硅比对C-S-H凝胶结构的影响。经过详尽的X衍射(XRD)与核磁共振(NMR)分析表明,制备的样品都具备C-S-H凝胶的峰型特征;活性反应法相对于沉淀反应法制备的C-S-H凝胶层间距小、聚合度低;证实了C-S-H凝胶的层状结构,且层间距随钙硅比的增大而减小;Q^2/Q^1值与直链平均长度随钙硅比的增大而减小。

  • 标签: C-S-H凝胶 凝胶结构 水热合成 插层反应
  • 简介:Thevolatilizationkineticsofantimonytrisulfideinsteamatmospherewasstudiedwiththermogravimetryattemperaturesfrom923to1123K.Atheoreticalmodelwasdevelopedtocalculatetheoverallrateconstantandthemasstransfercoefficientingasphases.Theexperimentalresultsshowthatthevolatilizationrateisenhancedwithincreasingtemperatureandsteamflowrate.Thevolatilizationrateismainlycontrolledbythemasstransportingasphases.Theapparentactivationenergyfortheprocessisfoundtobe59.93kJ/mol.ItisdemonstratedthatSb2S3isdominantlyoxidizedintoSb2O3andH2Sbywatervaporinthevolatilizationprocess.Someantimonymetalisformed.Thereactionmechanismisdiscussedinaccordancewithexperimentaldata.

  • 标签: Sb2S3 挥发性 热量分析法
  • 简介:Inpursuingexcellentsupercapacitorelectrodes,wedesignedaseriesofM0S2/C0S2compositesconsistingofflower-likedMoS2andoctahedron-shapedCoS2throughafacileone-stephydrothermalmethodandinvestigatedtheelectrochemicalperformanceofthesampleswithvarioushydrothermaltime.Duetothecouplingoftwometalspeciesandabigamountofwell-developedCoS2andMoS2,theresultsindicatedthattheMoS2/CoS2compositeselectrodesexhibitedthebestelectrochemicalperfor-mancewithalargespecificcapacitanceof490F/gat2mV/sor400F/gat10A/gamongallsamplesasthehydrothermaltimereached48h(MCS48).Furthermore,theretentionofMCS48is93.1%after10000cyclesat10A/g,whichmanifeststheexcellentcyclingstability.TheoutstandingelectrochemicalperformanceofMCS48indicatesthatitcouldbeaverypromisingandnovelenergystoragematerialforsupercapacitorsinthefuture.

  • 标签: MoS2/CoS2 COMPOSITES HYDROTHERMAL time ELECTROCHEMICAL properties