简介：

简介：Thecuttingpropertiesofthefunctionallygradientceramiccuttingtoolsrelatecloselytothegradientdistribution.Acuttingmodelofthefunctionallygradientceramictoolisfirstlydesignedinthepresentpaper.TheoptimumofgradientdistributionisobtainedbywayoftheFEManalyses.

简介：有限元素模拟在铝合金被利用在焊接状况的交流钨惰性的气体(AC-TIG)下面的2014焊接靶子的凸缘。模仿的结果在对为用实际焊接参数的板测试的剩余压力的好同意。而且，剩余应力的特征能在几个方面详细被调查，例如焊接结构，焊接序列，时间间隔，预热，并且修理焊接。断断续续的焊接可能对实际应用更方便、有益减少压力，并且焊接的本地修理可以显然在修理区域以内引起更多的应力。

简介：不同磁性的处理方向导致的行为在低合金钢焊接剩余压力减小的各种各样的数量被学习。减小26%28%在纵的压力σx当时，被获得低频率轮流出现磁性的处理垂直地被用于焊接祷告，而减小20%21%在σx除了领域方向被使用之外，被使用一样的处理参数测量平行到祷告。上述二个处理方向引起的压力减小的不同程度首先被归因于领域从外部磁场吸收的精力的改变，这被建议，它精力分开能由领域墙的运动在微观结构引起塑料变丑。

简介：TherelationshipbetweenCharpyabsorbedenergyandthefracturetoughnessbymeansofthe(cracktipopeningdisplacement(CTOD))methodwasanalyzedbasedontheWeibullstresscriterion.TheCharpyabsorbedenergyandthefracturetoughnessweremeasuredfortheSN490Bsteelundertheductile-brittletransitiontemperatureregion.FortheinstrumentedCharpyimpacttest,thecurvesbetweentheloadingpointdisplacementandtheloadagainsttimewererecorded.ThecriticalWeibullstresswastakenasafracturecontrolledparameter,anditcouldnotbeaffectedbythespecimenconfigurationandtheloadingpatternbasedonthelocalapproach.TheparameterscontrolledbrittlefractureareobtainedfromtheCharpyabsorbedenergyresults,thenthefracturetoughnessforthecompacttension(CT)specimenispredicted.Itisfoundthattheresultspredictedareingoodagreementwiththeexperimental.ThefracturetoughnesscouldbeevaluatedbytheCharpyabsorbedenergy,becausethelocalapproachgivesagooddescriptionforthebrittlefractureeventhoughtheCharpyimpactspecimenortheCTspecimenisusedforthegivenmaterial.

简介：Theaccuracyofnumericalsimulationsandmanyothermaterialdesigncalculations,suchastherollingforce,rollingtorque,etc.,dependsonthedescriptionofstress-strainrelationshipofthedeformedmaterials.Onecommonmethodofdescribingthestress-strainrelationshipisusingconstitutiveequations,withtheunknownparametersfittedbyexperimentaldataobtainedviaplanestraincompression(PSC).DuetothehighlynonlinearbehaviouroftheconstitutiveequationsandthenoiseincludedinthePSCdata,determinationofthemodelparametersisdifficult.Inthispaper,geneticalgorithmswereexploitedtooptimiseparametersfortheconstitutiveequationsbasedonthePSCdata.TheoriginalPSCdatawereprocessedtogeneratethestress-straindata,anddatapre-processingwascarriedouttoremovethenoisecontainedintheoriginalPSCdata.Severalgeneticoptimisationschemeshavebeeninvestigated,withdifferentcodingschemesanddifferentgeneticoperatorsforselection,crossoverandmutation.Itwasfoundthattherealvaluecodedgeneticalgorithmsconvergedmuchfasterandweremoreefficientfortheparameteroptimisationproblem.

简介：Theformationandevolutionofdeformationtextureinpolycrystallinematerialsarestudiedbyphase-fielddynamicmodel.Inaddition,thedrivingforceoftextureevolutionisalsodiscussed.Inthismodel,grainswithdifferentorientationaredefinedbyasetofcontinuousnon-conservedorderparameterfields.Simulationresultsshowthatgrainswithpreferredorientationgrowattheexpenseofthosewithunfavorableorientations.Itismoreimportantthat,elasticpotentialratherthanelasticenergyplaysacrucialroleintheevolutionoftexturewhetherthepolycrystallinesystemissubjectedtouniaxialstressorshearstress.

简介：ThispaperpresentsanexperimentalinvestigationonanAISI316Lstainlesssteelregardingmechanicalproper-tiesandshortuniaxialcreeptestsatelevatedtemperatures.Theshorttimecreeptestswerecarriedoutunderdifferentbutconstantstresses.Theobtaineddataofultimatetensilestrength,yieldstrength,creepcurvesandeffectsofelevatedtemperaturesonmechanicalpropertieswerepresented.Foraselectedrheologicalmodel,materialparameterswereobtained.Asajustification,suchrheologicalmodelisimplementedinthefiniteelementprocedureforanuniaxiallystressedspecimeninselectedenvironmentalconditions.

简介：Thesystematiclaboratorystudiesontherolesofsulfate-reducingbacteria(SRB)inthestresscorrosioncracking(SCC)susceptibilityofX80steelsubjectedtocathodicpotentialhavebeenconductedinanearneutralpHsoilsolutionbyslowstrainratetests.ThecathodicpotentialandSRBincreaseindividuallytheSCCsusceptibilityofthesteelinthesoilsolution.ThepositiveroleoftheSRBactivitiesinSCCsusceptibilitydependsontheprolongationofpre-incubationtime,andtheSCCsusceptibilityofthesteelincreasesundermorenegativepotentials.What’smore,theappliedpotentialsandthepresenceofSRBworktogetherinpromotingtheSCCsusceptibilityofthesteel.But,thecombinedactionbecomeslimitedwithdecreasingcathodicpotentials.Therelationshipsbetweentheplasticitylossandthepermeablehydrogenconcentrationwereestablishedforthesteelinthesoilsolution,regardlessofunderopencircuitpotentialorcathodicpotentials,inboththesterileandSRBinoculatedconditions.Therelationshipsarepracticallysignificantfortheselectionofsafecathodicprotection(CP)potentialsinthepresenceofSRBinsoilenvironment.

简介：关于排水量，速度，应力和紧张在的波浪方程机能上地，有连续地并且顺利改变的成分的坡度材料(FGM)被建立。四种波浪线性秒顺序是夸张类型的部分微分方程并且让一样的特征在X的飞机弯，t。一般来说，应力的变化模式在波浪的前面与排水量和速度的不同。但是在密度ρ的产品和材料的有弹性的模量E仍然是的一种特殊情况中未改变，三个波浪方程有类似的表情，他们在前面有一个类似的变化模式飘动。

简介：在各种各样的应力下面的316L不锈钢(316LSS)的Pitting腐蚀被potentiodynamic学习在3.5%NaCl答案的极化，电气化学的阻抗光谱学(EIS)和Mott-Schottky(MS)分析。极化曲线的结果证明随压力的增加，pitting潜力和被动当前的密度显著地减少firstly(180MPa)，然后极大地增加(200MPa)。在极化测试以后的样品的相应表面形态学很好对应于结果。Mott-Schottky分析证明了在潜力与更积极的fl吸附到被动film的表面的最少的Cl，显示一个中等压力能增加在3.5%NaCl答案的316LSS的pitting腐蚀电阻。

简介：

简介：连续冷却的用法在数字焊接的转变(CCT)图模拟现状。不过，说明在分别地导致不同CCT行为和CCT图的材料的化学作文提供限制。因此，在发展中的剩余压力上在CCT图分析变化的影响是必要的。在现在的纸，在剩余压力的数字计算以后的四张CCT图和他们的效果为煤气的金属弧焊(GMAW)焊接的广泛地使用的结构的钢S355J2+N被调查过程。而非执行CCT行为的任意的调整，四个有理由的数据集合被用作输入到数字计算：在Sysweld数据库，通过Gleebledilatometry测试获得的试验性的数据，和TTT/CCT预言可得到的数据从JMatPro和爱迪生焊接研究所(EWI)计算了虚拟加入门软件。执行数字分析就不同CCT图而言在剩余压力导致了显著偏差。而且，改进失真和剩余的预言的可能性基于CCT强调行为被讨论。

简介：被动导致电影的压力和危险性在在各种各样的pH价值的3.5%钠氯化物答案的7050铝合金的SCC被慢紧张率测试调查(SSRT)并且流动应力微分方法。结果证明到SCC的被动导致电影的压力和危险性与增加pH减少了价值什么时候pH7，当他们与增加pH增加了时价值什么时候pH>7。然而，当，腐蚀类型被解释脱落腐蚀什么时候pH=1并且14，并且没有电影，在标本的表面上形成。整个变化与pH导致电影的应力和SCC危险性阴谋当，价值两个都被介绍山谷形状。导致电影的压力的标志和数量与被动电影的作文有关，它用X光检查光电子被分析光谱学(XPS)。

简介：

简介：ConstantloadtestsinNS4solutionpurgedwithN2-5%CO2gasmixturewereconductedonAmericanPetroleumInstitute(API)X80pipelinesteelappliedinthe2ndWest-EastGasPipelineprojectwithandwithoutpreload.TheresultsshowthatcrackscouldinitiateandpropagateinX80pipelinesteelinnear-neutralpHenvironmentunderaconstantloadcondition.Thelifeofcrackinitiationandpropagationincreasedwithdecreasingappliedstress.Preloaddidnotchangeitscorrosionbehaviorobviously.However,preloadreducedthetimeforcrackinitiation.

简介：Intrinsiccarrierconcentration（ni）isoneofthemostimportantphysicalparametersforunderstandingthephysicsofstrainedSiandSi1-xGexmaterialsaswellasforevaluatingtheelectricalpropertiesofSi-basedstraineddevices.Uptonow,thereportonquantitativeresultsofintrinsiccarrierconcentrationinstrainedSiandSi1-xGexmaterialshasbeenstilllacking.Inthispaper,byanalyzingthebandstructureofstrainedSiandSi1-xGexmaterials,boththeeffectivedensitiesofthestatenearthetopofvalencebandandthebottomofconductionband（NcandNv）at218,330and393KandtheintrinsiccarrierconcentrationrelatedtoGefraction（x）at300KweresystematicallystudiedwithintheframeworkofKPtheoryandsemiconductorphysics.ItisfoundthattheintrinsiccarrierconcentrationinstrainedSi（001）andSi1-xGex（001）and（101）materialsat300KincreasessignificantlywithincreasingGefraction（x）,whichprovidesvaluablereferencestounderstandtheSibasedstraineddevicephysicsanddesign.