简介:当他们被使遭到影响时,在自然鱼眼石晶体的破裂坚韧上结果被介绍。裂缝和骨折的形态学被学习了。裂缝形成不显示出任何各向异性的性质并且仍然是可以是水晶的取向的一样,这被发现。破裂坚韧K//c和易碎物的平均价值索引,从裂缝长度的大小决定了被估计是0.107g亩m**减**3**/**2和4.19亩m**减**1**/**2分别地为一(100)飞机。收益力量为一(100),P(111)和C(001)为更低的负担的鱼眼石晶体的飞机是2250,2160和1840MPa并且分别地为更高的负担是1510,1600和1430MPa。(编辑作者摘要)7个裁判员。
简介:Inthispapertheresultsofahigh-speedtensionexperimentoftheSiC_w/Alcompositehavebeenreportedandasimplifiedtheoreticalmodelhasbeendevelopedtostudythefracturemechanismofcompositesinhigh-speedtension.Thistheoreticalmodelprovidesanewexplanationfortheincreaseofdynamicfracturestrengthofcompositesinhigh-speedtension.
简介:ThefracturetoughnessandfractureworkofAl2O3/SiCprismaticceramiccompositeswasevaluatedinthispaper,whichshowedthefractureenergywasimprovedgreatly.Basedontheobservationforcrackpropagationandfracturemorphology,thefracturebehavioroftheprismaticcompositeswasanalyzed.Inthebendingtest,thecompositesdisplayedanon-catastrophicbehaviorandagracefulfailurewithreasonableload-carryingcapability.
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简介:TherelationshipbetweenCharpyabsorbedenergyandthefracturetoughnessbymeansofthe(cracktipopeningdisplacement(CTOD))methodwasanalyzedbasedontheWeibullstresscriterion.TheCharpyabsorbedenergyandthefracturetoughnessweremeasuredfortheSN490Bsteelundertheductile-brittletransitiontemperatureregion.FortheinstrumentedCharpyimpacttest,thecurvesbetweentheloadingpointdisplacementandtheloadagainsttimewererecorded.ThecriticalWeibullstresswastakenasafracturecontrolledparameter,anditcouldnotbeaffectedbythespecimenconfigurationandtheloadingpatternbasedonthelocalapproach.TheparameterscontrolledbrittlefractureareobtainedfromtheCharpyabsorbedenergyresults,thenthefracturetoughnessforthecompacttension(CT)specimenispredicted.Itisfoundthattheresultspredictedareingoodagreementwiththeexperimental.ThefracturetoughnesscouldbeevaluatedbytheCharpyabsorbedenergy,becausethelocalapproachgivesagooddescriptionforthebrittlefractureeventhoughtheCharpyimpactspecimenortheCTspecimenisusedforthegivenmaterial.
简介:DopedSrTiO3capacitor-varistormultifunctionalceramicswerefabricatedbyasinglesinteringprocess.ACcompleximpedanceanalysiswasperformedtoinvestigateelectricalfeaturesofgrainsandgrainboundariesforbothas-reducedceramicandreoxidizedceramics.Theresultsshowedthattheas-reducedceramicexhibitedinductiveresponseathighfrequenciesabove2MHz,whichisattributedtothecontributionofelectronbehaviorinsemiconductinggrains.Thehighfrequencyinductiveresponsedisappearedinimpedanceplotsofreoxidizedceramics.
简介:Theresultsofatheoreticalstudyontheinfluenceofstrengthofinterphaseboundariesinmetal—ceramiccompositeonmacroscopicalcharacteristicsofcompositeresponsesuchasstrength,deformationcapacity,fractureenergyandfracturepatternarepresented.Thestudywasconductedbymeansofcomputer-aidedsimulationbymeansofmovablecellularautomatonmethodtakingaccountofadeveloped'mesoscopical'structuralmodelofparticle-reinforcedcomposite.Thestrengthofinterphaseboundariesisfoundtobeakeystructuralfactordeterminingnotonlythestrengthpropertiesofmetal—ceramiccomposite,butalsothepatternandrateoffracture.Theprinciplesforachievementofthehigh-strengthvaluesofparticle/binderinterfacesinthemetal—ceramiccompositionduetotheformationofthewidetransitionzones(areasofvariablechemicalcomposition)attheinterphaseboundariesarediscussed.Simulationresultsconfirmthatsuchtransitionzonesprovideachangeinfracturemechanismandmaketheachievementofahigh-strengthandahighdeformationcapacityofmetal—ceramiccompositepossible.
简介:Reducingthechloridecontentinregeneratedironoxides(RIO)fromsteel-picklingacidwasteeconomicallytreatedbyRuthnerprocessisthemostcriticalissueforthedevelopmentofRIOasausefulrawmaterialresource.Inthispaper,theresultsofanewmethodforcharacterizationandmodificationofRIOproducedinMobarakehSteelComplexwerereported.
简介:ThedistributedopticalfibersensingtechnologywasusedtoinvestigatethefracturebehavioroftheEpoxyAsphaltMixture.Thespatialdistributionandvariationofthestraindevelopmentwithcrackpropagationwereacquiredusingthebrillouinopticaltime-domainreflectometerthroughtheloadingexperimentsofthecompositebeamstructure.Inaddition,afiniteelementmodelofthecompositebeamstructurewasdevelopedtoanalyzethemechanicalresponsesoftheepoxyasphaltmixtureusingtheextendedfiniteelementmethod.Theexperimentalresultsshowthatthedevelopmentofcrackpropagationbecomesinstablewiththeincreaseoftheload,andlargerloadswillgeneratedeepercracks.Moreover,thenumericalresultsshowthatthemechanicalresponseofthecracktipchangeswiththecrackpropagation,andtheworstareasthatsubjectedtocrackdamagearelocatedonbothsidesofthecompositebeamstructure.
简介:骨头接枝可以被需要用metaphyseal在老病人填满骨头缺点弄碎的远侧的半径骨折。在这回顾,nonrandomized,单个外科医生的学习,我们评估了与使矿物化的骨胶原(MC)使用两块背面的锁住板与或没有扩大的临床、放射线学的结果为老病人与的骨头接枝背面地,metaphyseal弄碎半径破裂。在组1的病人(n=12)在组2用MC骨头接枝申请与背面的锁住的盘子被对待进metaphyseal骨头缺点,和那些(n=12)仅仅与背面的锁住的盘子。临床、放射线学的参数在外科以后在三和12个月被决定。在最后的后续,没有重要差别在2个组之间被注意以手掌倾斜并且光线的倾斜(p=0.80);然而,尺骨的变化在没有扩大,2与背面的锁住的盘子对待的组显著地增加了(p<0.05)。机能上地,这些组之间没有重要差别。我们的初步的学习建议骨头接枝代用品和背面的锁住盘子可以是的MC的那联合一为有metaphyseal的老病人有用地其他弄碎的远侧的半径骨折。
简介:Ahumanfacewithcomplex3Dstructureismachinedwithamodifiedfix-lengthcompensationmethodinthispaper.ThefastdevelopmentofMEMS(MicroElectromechanicalSystems)hasstronglyenhancedtheapplicationofnewharderworkmaterials.Asalowcost,flexible,goodrepeatablemachiningprocesswithnegligibleprocessforces,micro-EDMmillingiswellsuitedforfreeformmetallicmicrostructures.Amajorprobleminmicro-EDMmillingofcomplex3Dstructureistheelectrodewear.AnewCAMsystembasedontheUGsoftwareplatformisdevelopedinordertogetgoodaccuracyandhigherefficiency.Acorrectioncoefficientisintroducedanddeducedforthemodifiedfix-lengthcompensationmethod.Usingthismethodahumanfacewithcomplex3Dstricterismachinedsuccessfullybymicro-EDMmilling.
简介:与铽做的硅石和硼硅石玻璃材料器官的建筑群被准备由在situ大音阶的第五音胶化方法分别地。XRD和SEM大小被执行验证玻璃的非结晶的结构。玻璃的结构和做的Tb(III)离子的精力水平上的玻璃内容的影响被排放系列和红外系列分析。稀土元素的photolumi-nescertee性质上的B_2O_3的效果在硅石的器官的建筑群--基于的玻璃被调查。红外系列显示在原处综合的稀土元素复杂分子被限制,到主人的微毛孔,ligands的颤动被冻结。当B_2O_3被增加进硅石主人胶化时,B_2O_3几乎没在玻璃,和BO_3三角的非结晶的结构上有小影响,它有与硅石框架不同的层结构,能形式。硅石网络因此成为了尘埃不均匀,并且铽建筑群的光随B_2Opercent数量的增加被熄灭。
简介:在原处,有在硅石矩阵的柳酸(柳安)的铽建筑群的合成被一个二拍子的圆舞大音阶的第五音胶化过程做。有柳酸的铽建筑群在大音阶的第五音胶化被形成导出硅石胶化,并且由光刺激系列证实了并且红外线(红外)系列。作为与纯铽建筑群粉末相比,包含铽建筑群的硅石胶化展出它的典型排放并且为纯建筑群比那介绍更长的荧光一生。复杂包含硅石胶化的光性质被调查,与那些相比,两个,铽做了硅石胶化和纯复杂粉末。导致上述结果的原因也被讨论。(编辑作者摘要)7个裁判员。