简介:Basedonstatisticsprinciple,randomerrorandsystematicerrorwereconsideredandthevolumetricpropertiesofthetwomixturestypes,namelyAandB,werestatisticallyanalyzedusingdifferentdistributionmethods.Seventy-twosamplesofmixtureAandfifty-twoofmixtureBwerefabricatedusingtheMarshallmethod.Theprobabilitydistributionswerecomparedonthebasisofgoodnessoffit.Weibullmodelwasfoundtobemostappropriatemodelfordescribingtheasphaltmixturesvolumetricpropertiesdistribution.Thetwo-parameterWeibulldistributionfunctionappliedwelltomodelthebulkspecificgravityandvoidsfilledwithasphaltdata,whereas,thethree-parameterWeibulldistributionappearedtobemoreappropriateinthediscussingofairvoidsandvoidsinmineralaggregate.Theexperimetalresultsisrevealedthatcomparedwiththemeanvalue,thepeakvalueofWeibulldistributionwassuggestedasanalternativeandmorepowerfulparameterfordescribingthetestdatadistributioncharacteristic.Theanalysisoftestresultsalsorevealedthatthereweresignificantdifferencesinthevolumetricpropertiesofthetwotestedmixturesforthesameconfidencelevel.Theconfidenceintervaldecreasedwiththedecreasinginreliability.
简介:Inthispapertheresultsofahigh-speedtensionexperimentoftheSiC_w/Alcompositehavebeenreportedandasimplifiedtheoreticalmodelhasbeendevelopedtostudythefracturemechanismofcompositesinhigh-speedtension.Thistheoreticalmodelprovidesanewexplanationfortheincreaseofdynamicfracturestrengthofcompositesinhigh-speedtension.
简介:Thesteelreinforcedplasticpipeisakindofgreenenvironmentalprotectionpipelineswithdouble-sidescorrosionresistingandbetterwithstandingtomediumworkingpressure.Thestructureandtechnicalprocessofthispipearedescribedbrieflyinthispaper,andthefiniteelementanalysishasbeendoneforthesakeofunderstandingthedistributionsofstressanddisplacementinsidethispipeunderhydrostaticpressure.Theanalysisresultsareveryimportantforsafetyapplicationofthesteelreinforcedplasticpipe.
简介:DensityofmoltenNiandNi-Walloyswasmeasuredinthetemperaturerangeof1773~1873Kwithasessiledropmethod.ThedensityofmoltenNiandNi-Walloystrendstodecreasewithincreasingtemperature.ThedensityandmolarvolumeofthealloystrendtoincreasewithincreasingWconcentrationinthealloys.ThecalculationresultshowsanidealmixingofNi-Walloys.
简介:Machinetoolhasbeenwidelyusedintheproductionofthemilitaryandcivilian.Themachiningprecisionoftheworkpieceisthedirectreflectionforthemachiningperformanceofmachinetool.Withtheimprovementforrequirementofthemachiningprecision,improvingtheaccuracyofmachiningisbecomingimportant.Guidewayandspindlearethekeymotioncomponentsthatdecidedtheshape,therelativepositionandthesurfaceroughnessoftheworkpiece.Inordertoadapttotherequirementsoftheworkpiecemachining,thispaperanalyzestheerrorsofguidewayandspindlethataffecttheaccuracyoftheprocessing,establishesthemotionrelationsforeveryerrorsofguidewayinmachiningprocess,identifiestheregularforthestraightness,bendingoftheguidewayandrotatingerrorofspindlethatinfluencestheworkpiecesurface.Finally,accordingtothecorrelationanalysisofthemeasuredandthesimulationresults,themotionerrorofmachinetoolisidentified,whichlaysthefoundationforimprovingtheaccuracyofmachinetoolinnextstep.
简介:Thegradingcriterionofblastingclassification,evaluatingindexandthecharacteristicvaluearetakenasmatterelements.First,therelationalfunctionisconstructedaccordingtothegradingcriterion,andthen,thegradeofrockblastingisevaluatedbythecomprehensiverelationaldegree.Theauthorhaspresentedasystemmethodofblastingclassificationofrock.Thepracticalexampleprovesthatitissimpleincalculationandreasonableinevaluation.
简介:在不同水和年龄和它充满力量的生长法律获得似水泥的材料的水和产品的作文和微观结构,合成似水泥的材料的最佳的比例根据波特兰水泥32.5R镇静的水泥clinker的化学作文被决定,CSA42.5sulphoaluminate水泥和二石膏(CS)。在不同水和年龄的合成似水泥的材料的描述被NMR,XRD和SEM技术进行。水和的机制被探索。测试的压缩力量随水和年龄的增加逐渐地堵住增加,这被显示出。合成似水泥的材料的微观结构能在水和过程从Al-O八面体被变成Al-O四面体。与Si-O四面体和Al-O四面体形成的含水的碱aluminiumsilicate。Si-O四面体的聚合的度逐渐地增加了,并且似水泥的材料的结构的力量继续增加。clinker矿物质的衍射山峰逐渐地与水和年龄的延期减少了。完全含水的CaSO4在导致了似水泥的材料的高早的力量的水和期间在船尾生产。合成似水泥的材料的早水和产品是在船尾与针酒吧结构。主要中间和最后一水和产品是有稠密的棱柱的形状的CSH胶化和CH胶化。合成似水泥的材料的显微镜的毛孔逐渐地减少了并且改进了充满块的以后的力量。强壮的支持我的外面被为区域提供。
简介:过程的热踩,熄灭并且划分的一个新奇设计计划在可抑制的硼钢被进行获得nanometric包括极其细小的保留的奥氏体和马氏体的双微观结构。材料拥有优秀机械性质,这被显示出,没有损害力量,韧性能进一步被改进。最新对待的钢与热印上并且熄灭的钢的相比从6.6%~14.8%显示出优秀机械性质和钢增加的全部的延伸。因此,这种钢成为了另一组先进高张力钢。为如此的优秀机械性质主要负责的微观结构被调查。
简介:Anionomer类型水运的聚氨酯分散(手)被获得从poly(丙烯乙二醇)(PPG),isophoronediisocyanate(IPDI)和通过修改prepolymerisocyanate的dimethylolpropionic酸(DMPA)处理。聚氨酯的二个系列被准备(组A和B)并且一个新预言模型基于灰关系分析被介绍在几个性质上预言原料的影响顺序例如固体内容,粘性,酸数字和聚氨酯的电解稳定性。模型罐头成功地通过设计示范实验在性质上预言原料的影响,这被发现。而且,预言模型的结果证明DMPA在粘性,部分酸价值和电解稳定性起一个关键作用。