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简介：Onthebasesofhightemperaturecreepexperiments,theresearchonengineeringapplicationofrheologicalformingiscarriedoutontwokindsoflightmetalalloypartsnamedcylindricalshellofLc4aluminumalloyandvanediskwithcomplexcurvedsurfaceofTC11titaniumalloy.Moreover,themechanicalpropertytestsunderroomandhightemperaturesfortheworkpiecesproducedbythisnewtechniquearealsodone,theresultsshowedthattheyaremuchimprovedevidentlycomparedwiththoseproducedbytraditionalmethod.

简介：Inthispaper,variousstrategiesofspiralirradiatingschemefortheflameformingofabowlshapedsurfaceareinvestigatedexperimentallyandnumerically.Experimentalworkisperformedusingaflametorchintegratedwitha2-axisCNCworkstation.TheABAQUSimplicitsolverisusedinthenumericalsimulation.Threedifferentstrategiesofthespiralirradiatingschemeareinvestigatedfortheflameformingofabowlshapedsurface.ThefirststrategyistheSimplespiralirradiatingscheme,thesecondistheRotationalspiralirradiatingscheme,andthethirdistheSymmetrical-Rotationalspiralirradiatingscheme.TheresultsshowthatusingtheSymmetricalRotationalspiralirradiatingscheme,abowlshapedsurfacewiththemaximumdeformationcanbeproduced,followedbyusingtheRotationalscheme,andtheSimplespiralscheme.ItisalsoconcludedfromtheresultsthatthespiralirradiatingschemewithSymmetrical-Rotational,RotationalandSimplespiralschemesleadtothemaximumsymmetriesintheproducedbowlshapedsurface,respectively.Allthenumericalresultsareingoodagreementwiththeexperimentalobservations.

简介：在表金属形成形成限制的预言在面对研究人员的最重要的挑战之中。在这份报纸，一个充分联合的elastic-plastic-damage模型被开发了并且实现进明确的代码。由于飞机压力和有限紧张理论的采纳，模型能快速并且精确地预言部分的变丑和损坏。另外，在一些操作的损坏开始，繁殖，和骨折与实验被预言并且验证。与连续统损坏力学相结合的有限紧张能被用作一个快工具在形成过程的表金属预言可锻的损坏，骨折，和形成的限制，这被结束。

简介：话题在不同表面地里的球形的壳监禁下面的形成柱体的diblock共聚物(DBCP)自己组装用真实空间的前後一致的地理论计算(SCFT)被探索。用这条途径，我们在不同监禁尺寸和表面地观察了形成柱体的DBCP的各种各样的微观结构。从寻找详细说明microdomain形态学，一个明显的结论是在监禁之间的相互作用出现，聚合物穿上大效果自己组装。大多数微观结构大批或在平面、圆柱的监禁下面唯一、不报导。

简介：Thispaperinvestigatestheequivalentmodelforthefrictionboundaryconditionbetweenblankandholderduringsheetmetalformingsimulation,andproposesanequivalentalgorithm,thethicknessthresholdvaluealgorithm,forthefirsttimebasedonthicknessweighting.Thisalgorithmassumesthattheholderclearanceisuniformduringsheetmetalforming;andthemainreasonfortheunevennessoffrictionforcedistributionundertheholderisthattheunevendeformationoftheblankleadstoitsuneventhicknessdistribution,whichmakesthelocalpressureontheblankdistributedunevenly.Thealgorithmproposedinthispapercaneffectivelysimulatetheinfluenceoftheunevennessontheformingprocess.Validityofthisalgorithmisverifiedbyacomparisonbetweenthesimulationresultsandtheexperimentalonesforthedrawingprocessofacarspringbase.

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简介：(L减水乳酸)(PLLA)Poly，/pristine蛭石nanocomposites被准备由融化掺双轴的extruder，和热、机械的性质的蛭石分散状态的详细信息和蛭石的效果系统地被学习。当装载内容不超过3wt%时，结果证明在矩阵的蛭石的分散相当好。太古的蛭石能显然在nonisothermal结晶化期间改进融化结晶化温度。两结晶化时间跨度和PLLA的spherulitic尺寸由提高PLLA的主要成核在等温的结晶化状况下面与蛭石的增加的数量减少。并且增加的蛭石能也改进张力的模量和PLLA的Izod影响力量。为PLLA上的蛭石的起核心作用的效果的内在的机制被建议是在蛭石和PLLA之间的取向附生的结晶化和特定的相互作用。

简介：Theglass-formingability(GFA)andmagneticpropertiesoftheGd_(50)Coso-basedamorphousaiioywithAladditionsubstitutionforCoareinvestigated.ItisfoundthattheGFAandmagneto-caloriceffectoftheGd_(50)Co_(45)Al_5amorphousaiioyarebetterthanGd_(50)Co_(50)amorphousalloy.Themaximummagneticentropychange(-△S_m~(peak))andthemagneticrefrigerantcapacityoftheamorphousalloyunderafieldof5Tareabout6.64J·kg~(-1)K~(-1)and764J·kg~(-1),respectively.Thefielddependenceofmagneticentropychangemeetstheonepredictedbythemeanfieldtheory,whichisinvestigatedforabetterunderstandingofthemagneto-caloricbehaviorsoftheGd_(50)Co_(45)Al_5amorphousalloy.

简介：这篇论文介绍各向异性的损坏理论的应用程序给形成A12024T3铝合金表的限制图的学习。在限制铝板结构的紧张的预言，一个有限元素房间模型被构造了。房间模型由二个阶段，铝合金矩阵和金属间化合的簇组成。铝合金矩阵的材料行为与充分联合的elasto塑料的损坏被描述组成的方程。金属间化合的簇被假定有弹性、易碎。由改变拉长的比率，在二轴的拉长下面的表的限制紧张被使用建议的necking标准预言了。预言在对试验性的调查结果的好同意。而且，有限元素房间模型能为理解铝合金的显微镜的损坏机制提供信息。如果材料损坏的效果在形成学习的表金属被忽略，限制紧张的在评价上可以结果。

简介：一系列(p-phenylenevinylene)poly，有好溶解度的s(PPV)poly从先锋的热消除被综合(2,5-didodecyloxy-p-phenylenevinylene)在经由Wessling的不同温度方法。聚合物光物理学被热消除条件影响，它与NMR和红外描述一致。为在高消除温度获得的PPV，在在解决方案并且在电影的更长的波长和转移红的排放最大值的另外的吸收山峰在这些系统显示了更长结合的块的存在。为为PPV的落下演员组电影(436nm)的排放最大值下面获得了200

简介：Novelpyrimidinenucleoside-3,5-dicyanopyridinehybrids(4)orpyridineattachedacylureas(5)wereselectivelyandefficientlypreparedfromthereactionof2'-deoxyuridin-5-yl-methylenemalononitrile(1),malononitrile(2)andthiophenol(3)orfromanunexpecteduracilring-openingandpyridinering-formingsequenceviathereactionof1and3.Itisthefirsttimesuchasequencehaseverbeenreported.