简介：Steelhasbeenusedasatraditionalwheelmaterialsforalongtime.Before1980’s,over90%wheelsweremadeofsteels.Then,theyieldstrengthofwheelsteelsincreasedgraduallyfrom240-350MPato600MPaorhigher.Theadvancedhighstrengthsteelsbecomethemainwheelmaterials.Since1990’s,DP600hasbeenbroadlyappliedinsteelwheelsoversea.However,therewaslittleresearchofapplicationofhighstrengthsteelwheels(especiallywheeldisc)indomesticwheelindustrial.Inpresence,DP600steelwheelisonlydevelopedinFAWSHbyusingimportedCKD.OtherdomesticsteelwheelmanufacturersdidlittleworkonhighstrengthDP600wheeldiscs.BaosteelwheelsCo.Ltd.isthefirstdomesticcompanyproducingDP600steeldiscsandhasbecometheleadingcompanyinproductionofhighstrengthwheel.BecauseofthehighstrengthofDP600,itsformability,springback,andwrinklehavebecomethekeysofthesuccessfulapplicationofDP600steel.Inthispaper,themetallurgicalandmechanicalpropertiesarefirstlyintroducedandformationproblemsofDP600aredescribedcomparedtotraditionalsteels.Secondly,FLDanalysishasbeendone.Wrinkleandmorespringbackarerecognized.Tosolvetheseproblems,anoptimizedsolutionisdesignedandthegoodresultisobtained.ThetesthasshownthatthefatiguepropertyofsteelwheeldiscsmadebyDP600havebeengreatlyimproved.

简介：<正>Thenotionofthestarchromaticnumberofagraphisageneralizationofthechromaticnumber.Inthispaper.wecalculatethestarchromaticnumbersofthreeinfinitefamiliesofplanargraphs.Thefirsttwofamiliesarederivedfroma3-or5-wheelbysubdivisions.theirstarchromaticnumbersbeing2+2/(2n+1).2+3/(3n+1)and2+3/(3n-1),respectively.ThethirdfamilyofplanargraphsarederivedfromnoddwheelsbyHajosconstructionwithstarchromaticnumbers3+1/n.whichisageneralizationofoneresnltofGaoetal.

简介：TopromotetheapplicationofMgalloytomotorcyclewheeltoreduceweight,thefatigueanalysesofwheelsmadeofA356,AM60BandredesignedAM60Bunderthesameserviceconditionwerecarriedout,revealingthatthepeakstressisreducedby25.6%andstressdistributionbecomesmoreuniforminMg-alloywheelduetoitslowerelasticmodulusincomparisonwithAlalloys.TheservicestresslevelofredesignedMgwheelisrelaxedfurtherbecauseofitsoptimizedstructurebyalteringthespokeconfigurationandincreasingthefilletbetweenspokeandring,satisfyingthedesiredreliabilitywith30%weightsaving.

简介：ＧｏｔＢａｄ　Ｗｈｅｅｌｓ？你会马失前蹄吗？──学会如何辨认和处理一些常见的腿、脚、踝关节受伤尹东红译（广西民院外语系）作为体操运动员，可能你们中的每一个人都会把一些东西想当然，比如说你们的腿、脚和踝关节，大部分人只是想像或是期望它们能完美地发挥作用...