简介:摘 要:以某一规格的O形密封圈为例,在Ansys中建立有限元分析模型,得出密封圈弹性模量与接触应力的关系;然后通过试验得出不同时效温度下,时效时间与弹性模量的关系;进而将仿真模型和试验数据结合得出时效时间与接触应力的关系,再结合密封圈失效判断准则和伺服阀实际应用条件,确定出合理的时效时间与时效温度。
简介:[篇名]ParentphaseageingandmartensitestabilizationinCu-Al-Nibasedmeltspunshapememoryribbons,[篇名]ISSUESRELATEDTODURABILITYOFFRPREINFORCEMENTFORRCSTRUCTURESEXPOSEDTOACCELERATEDAGEING,[篇名]AgeingofelectricalinsulationmaterialsusingaTeslatransformer,[篇名]Impactofageingontribologicalpropertiesofenvironmentallyfriendlyhydraulicfluids,[篇名]Comparisonofdifferentneuralnetworksalgorithmsusedinthediagnosisandthermalageingpredictionoftransformeroil,[篇名]Voltageresponsemeasurementsforpowertransformermoistureandageingconditionassessment,[篇名]Newtechnologyinanageingassetbase,[篇名]Usingequivalentfailureratestoassesstheunavailabilityofanageingsystem
简介:Ageingeffectoncreep-fatiguepropertiesofsuper-clean9%CrMoVsteelforsteamturbinerotorsofcombinedcyclepowerplants.EXPERIENCElNMANAGEMENTOFAGElNGOFBRlDGESINEASTERNEUROPE.Transportpolicyforanageingpopulation.Ageingofimpregnatingliquidswithdifferentchemicalstructureforpolypropylenecapacitordielectric.
简介:目的:观察腰神经通道卡压综合征病人接受硬膜外阻滞后肢端温度的变化及局麻药的作用时效。方法:58例腰神经通道卡压综合征病人接受硬膜外阻滞前及后的肢端温度变化并测定阻滞时效;并与随机50例其它手术硬膜外阻滞病人进行比较。结果:阻滞后患侧的皮温明显低于健侧(P<0.01),患侧局麻药的显效时间明显慢于健侧(P<0.01)。与其它手术硬膜外阻滞病人比较,差异非常显著(P<0.01)。结论:椎管内的骨性或纤维性改变,可卡压神经根,导致神经根缺血、变性、纤维化和血管弹性差等病理改变,由此可使卡压部位对局麻药的吸收和弥散速度减慢。