简介:在这份报纸,type-II超导体的机械性质上的磁性的nanoparticles的效果理论上并且数字地被调查。与在有限尺寸的球状的磁性的包括和一个Abrikosov旋涡之间的相互作用联系的卡住的力量的磁性的部分在伦敦近似被计算。磁性的nanoparticles的尺寸和形状导致旋涡卡住在的不同改进,这被发现大--type-II超导体。同时,屏蔽水流由磁性的球状体导致了承受Lorentz力量的行动,它将导致在超导体对,因此进一步数字的计算被需要探索在球状的磁性的粒子和超导体之间的相互作用。在超导体的排水量,应力和紧张的分发最后被获得。nanoparticles的不同尺寸和形状能也改变这些数量的分布,这被显示出。
简介:Fatiguecrackingtestsofasolderjointwerecarriedoutusingin-situscanningelectronmicroscopy(SEM)technologyundertensileandbendingcyclicloadings.Themethodforpredictingthefatiguelifeisprovidedbasedonthefatiguecrackgrowthrateofthesolderjoint.Theresultsshowthattheeffectoftheloadingtypeonthefatiguecrackgrowthbehaviorofasolderjointcannotbeignored.Inaddition,thefiniteelementanalysisresultshelpquantitativelyestimatetheresponserelationshipbetweensolderjointstructures.Thefatiguecrackinitiationlifeofasolderjointisingoodagreementwiththefatiguelife(N50%)ofatotallyelectronicboardwith36solderjoints.
简介:Basedontheporousmediatheoryandbytakingintoaccounttheeffectsoftheporefluidviscidity,energyexchangesduetotheadditionalthermalconductionandconvectionbetweensolidandfluidphases,amathematicalmodelforthedynamic-thermo-hydro-mechanicalcouplingofanon-localthermalequilibriumfluid-saturatedporousmedium,inwhichthetwoconstituentsareassumedtobeincompressibleandimmiscible,isestablishedundertheassumptionofsmalldeformationofthesolidphase,smallvelocityofthefluidphaseandsmalltemperaturechangesofthetwoconstituents.Themathematicalmodelofalocalthermalequilibriumfluid-saturatedporousmediumcanbeobtaineddirectlyfromtheaboveone.SeveralGurtin-typevariationalprinciples,especiallyHu-Washizutypevariationalprinciples,fortheinitialboundaryvalueproblemsofdynamicandquasi-staticresponsesarepresented.Itshouldbepointedoutthatthesevariationalprinciplescanbedegeneratedeasilyintothecaseofisothermalincompressiblefluid-saturatedelasticporousmedia,whichhavebeendiscussedpreviously.