简介：近年来有关于熔融沉积快速成型的技术迅速被普及,3D打印机的使用已经大众化。FDM（熔融沉积成型）3D打印件缺陷的产生极大地阻碍了3D打印使用的发展,论文归纳总结了FDM3D打印件缺陷的种类,并针对各类缺陷分别研究了其处理的方法,最大限度提高3D打印件的质量,减少废品率。

简介：某升降机齿条在搬运过程中摔断,齿条材料为60钢。对齿条断口,材质的金相组织、化学成分和力学性能进行分析,确定齿条断裂失效的原因。结果表明：齿条的断裂性质为冲击载荷所致的脆性断裂;由于正火加热和冷却方式不当,造成齿条的晶粒粗大且铁素体呈网状分布;齿条化学成分中Si、Mn元素含量超出标准要求范围,S、P元素处于标准规定值上限;材料中存在较多的非金属夹杂物,以上几个因素共同作用,导致齿条发生断裂。

简介：针对穿甲弹在生产定型试验中出现的底火体断裂现象,通过底火体设计计算、生产过程控制、故障底火体检测3个方面的排查,并采用减薄底火体退刀槽部位尺寸从而模拟底火体受损、强度降低的方法,验证了故障现象,查清了故障原因。结果表明：底火在安装过程中受到较大扭力和轴向拉力的作用,底火体薄弱位置螺纹根部产生微裂纹机械损伤,强度大幅下降,从而弹药在发射过程底火体产生断裂。因此,提出改进底火体强度设计和保证正确安装使用措施,后续生产产品再未发生同类故障。

简介：某型飞机飞行一段时间以后,伞舱盖上装夹弹簧的带锁销转臂的底板发生开裂,开裂位于焊缝与底板交接的位置,并穿透了底板,该开裂具有普遍性。本文通过对开裂转臂的宏观观查、断口检查、热影响区域的金相组织对比分析、硬度检测,结合转臂受力条件和工作时的应力环境,对开裂的性质和原因进行了分析。结果表明,转臂底板开裂属疲劳开裂,底板整体承载能力不能满足该处受力条件是导致转臂疲劳开裂的直接原因。将转臂厚度增加,该故障未再出现。

简介：某特种车辆输入齿轮材料为38CrSi钢，行驶过程中在减重孔处发生断裂。在对输入齿轮进行痕迹分析、断口宏微观观察、组织和性能检查等试验的基础上，对齿轮减重孔的断裂性质及断裂原因进行了分析。试验结果表明：齿轮减重孔断裂起源于孔侧面，断口以韧窝形貌为主，断裂性质为过载断裂。分析表明：未进行调质处理导致材料的硬度与强度不足是齿轮减重孔处发生断裂故障的主要原因。

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简介：[篇名]SignificantincreaseinmachinepartdurabilityandlongevityduetothenewpatentedLincarb,LinterprocessandLinheattechnologies，[篇名]Lasersurfacetreatmentofsteels，[篇名]ForecastingofthePhaseTransformationHardenedZoneandGorrelationInfluenceFactorsintheSurfaceHeatTreatmentbyPlasma，[篇名]Fatigueandfracturebehaviorofalasersurfaceheattreatedmartensitichigh-nitrogentoolsteel，[篇名]Theoreticalmodelsofsurfaceheattreatmentofproductsinsolarfurnaces-1:uniformradiant-energyflux。

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简介：CorrelationbetweentheflnorescentmaterialsproducedbyendosymbioticpseudomonasfluorcscensFPT-9601andmicrobialcontrolofsoil-bornebacterialdiseaseusingthisstrain；CORROSIONOFALUMINUMALLOY2024BYJETFUELDEGRADINGMICROORGANISMS；Developmentandtestingofnewvolatilecorrosioninhibitorsfornultimetalsystems；Developmentofdiscbrakerotorsforheavy-andmedium-dutytrackswithhighthermalfatiguestrength；DimethylSulfideRemovalfromSyntheticWasteGasUsingaFlatPoly(dimethylsiloxane)-CoatedCompositeMembraneBioreactor。

简介：AStudyofMicrobiologicallyInducedCorrosionbySRBonCarbonSteelusingHydrogenPermeation,Alloying,DeoxidizingandInoculatingCastAlloyswithPressedPowderPseudo-MasterAlloys,Anaerobicdigestionforreductionandstabilizationoforganicsolidwasteduringspacemissions:Systemsanalysis,Anaerobicdigestionforreductionandstabilizationoforganicsolidwastesduringspacemissions:Laboratorystudies,AssessmentofmicrobialcommunityvariabilityinreplicatetubularnitrifyingbioreactorsusingPCRandTRFLPanalysis.

简介：Dampingahybridsteppingmotorwithestimatedpositionandvelocity,Gridcurrentregulationofathree-phasevoltagesourceinverterwithanLCLinputfilter,TorsionalinteractionstudiesonpowersystemcompensatedbySSSCandfixedcapacitor,Amultivariablenewcontrolsolutionforincreasedlonglinesvoltagerestorationstabilityduringblackstartup,

简介：[篇名]Magneto-OpticalStudiesoftheCriticalStatesinc-axisOrientedMgB{sub}2ThinFilmandBulkMgB{sub}2/MgNano-Composites，[篇名]TheSoreteffectonconvectioninahorizontalporousdomainundercrosstemperatureandconcentrationgradients，[篇名]Improvingtheanti-seizureabilityofSiCsealinwaterwithRIEtexturing，[篇名]Coppernanoparticleswithinamorphousandcrystallinedielectricmatrices，[篇名]In-linelaserDopplervelocimeterusingfibre-opticBragggratinginterferometricfilters，[篇名]PreparationofaUV-attenuatingagentusingamechanochemicalreaction，[篇名]DesignofanAdaptiveObserverforSensorlessVectorControlofInductionMachinesunderRegeneratingConditions，[篇名]ConflictovernaturalresourcesamongpastoralistsinnorthernKenya:alookatrecentinitiativesinconflictresolution，[篇名]Releasingnitrogenfromammoniatedligninbywhiterotfunguscometabolizesenvironmentalpollutants，[篇名]Onanalogyanddissimilarityofdependenceofstabilityonseveralparametersinflowsimulations，[篇名]Ontheexponentialstabilityofaclassofnonlinearsystemsincludingdelayedperturbations，[篇名]6-indiameterInPsinglecrystalsgrownbythehot-wall，[篇名]Swing-upControlofaTranslationalInvertedPendulumHavingRestrictedTravel，[篇名]RobustPIDRate-BasedControlforPropagationDelayVariation，[篇名]Apracticalapproachforthedesignofmultivariablecontrolsystems，[篇名]Fibersensordetectslithium。

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简介：[篇名]Doublethermochemicaltreatmentintoolmanufacturingfromstructuralsteel，[篇名]Lifetimepredictionofhelicoptergears:experimentalinvestigationsandcomputermodelling，[篇名]Fluidizedbedapparatusesforthermaltreatmentandclassificationofdispersematerials，[篇名]Experimentalrigofthermochemicaltreatmentscraptires，[篇名]Thermochemicaltreatmentofsteel20khuponcyclictemperaturechanges。

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简介：[篇名]Relationsbetweenfracturetoughness,hardnessandmicrostructureofvacuumheat-treatedhigh-speedsteel，[篇名]Flexiblefurnaceconceptsforvacuumheattreatmentusinghigh-pressuregasquenching，[篇名]Effectofboronmicro-alloyingonmicrostructureandmechanicalpropertiesoffine-grainedCM247LCsuperalloy，[篇名]PROPERTIESOFPOLYCRYSTALSSINTEREDATHIGHPRESSURESFROMDIAMONDNANOPOWDERSPRODUCEDBYDETONATIONANDSTATICSYNTHESES，[篇名]TheEffectsofSteelQuality,VacuumHeatTreatmentQuenchRateandCharpyV-NotchImpactTestTemperatureontheImpactToughnessandMicrostructureofPremiumQualityH-13ToolSteel。

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简介：SY508-3-08[篇名]Stablefuzzycontrolforaclassofnonlinearsystems，SY508-3-09[篇名]Determinationof36{supleft}CIinenvironmentalsamplescollectedintheJCObyAMS，……