CUPTIRE耐候板性能及其尺寸效应的研究

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1、中斟分类号：U270．4UDC：学授代弼：10004害级：公开北京交通大学工程硕士学位论文09CuPTiRe耐侯板性能及其尺寸效应的研究Y108j735MechaIlicalProper【iesandn’sSjzeE陆ctof09CuPTiReWeatherpmofSCeel作者姓名：常龙导师姓名：何庆复工程领域：机械工程学号：Ou30067职称：教授学位级别：工程硕士北京交通大学2007年6月』E斑窑丝厶：羔曼!尘受：￡竺芷迨奎△旦SI壁△￡!ABSTRACTInthispaper’thestrengthandimpacttoughnessof09CuPTiReweather

2、pr00fsteelinV撕ousthicknessproducedbytwodi行eremsteelcompanywastested．ByusingstatisticsmethodtoanaIyzethetesteddata，itisshowedthatthemechanicalpropertiesof09CuPTiReweatherproofsteelcaIlmeettherequirementoftheTB／T1979·2003．chereisnospecialdi腩rentinsteelplate’sstren昏hpropeniesbe研eentwomanufacto叫

3、works．wiIhthedecreasingofit’sthickness，bothofthestren昏handplasticitypropenyofsteeIplateareincreasedbecauseofcrystalgrainsizere6necausedbyquickerc001ingspeed．ButcIeardifI色rentisshowedinimpacttoughnesspropeniesbetweentwomanufactoryworksespeciaUyatIowtemperature．Theimpacttougtlllessdataisnotpro

4、portionedwiththesectionareas0fsample，ithassizeefrectnotcausedbythedi腩rcntofsteelplate’sthicknessbutthedi腩remofsarnplesize．Thee肫ctis，din’eremaccordingtotheimpacttoughnessofsteelplate．TheimpacttoughnessincreasedwimitssectionareagettingIargewhenitsmostoffhcturesurfaceisductile，butimpacttougllIl

5、essdecreaSedwithitssectionareaincreaSingwhenitsmostoffhcturesurfhceisbrittle．Astheresult，theweatherproofsteel09CuPTiRecanobtainedgoodimpacttoughnessatlowtempemturebycrystalgminsizere丘nedandsteelliquidspuri巧ed．Consideredofthesizeefrect，itshouldbeslipulatedthattheimpactabsorbingene瑁yof09CuPTiR

6、eshouldnotlessthan27JwhateVersizeofsampleisused．MoreeVer，thetestingresuItsshowsmattheratioofyieldstrengthaJldtensilestren舒hisabout0．78notlessthanO．75asTB／T1979·2003stipulated．Thisstipulationshouldbecancelledbecauserequiredlowerratioofyieldstren殍handtensiIestrengmmeansla玛ecrystal笋ainsize，andm

7、aybecausedbadimpactabsorbingene昭yatlowtemperature．KEYWoRDS：Weatherproofsteel；Strength；Sizeefrcct：Inlpacttougilllessat10wtempemcure致谢本论文足在我的导师何庆复教授的悉心指导下完成的，何教授对我的论文提出了许多的宝贵意见和建议，其严谨的治学态度和科学的工作方法给了我极大的帮助和影响，在此表示衷心的感谢。在本论文的实验和数据收集阶段，北京二七车辆厂理化实验室的同事们对