简介：lObjectiveTalar身体破裂是稀罕的并且有差的处理结果。学习是报导关上的talardomefractures.MethodsEight的长期的外科的治疗结果的这的目的关上了talar身体破裂，在我们的水平与小碎片cancellous螺丝钉或Herbert螺丝钉由开的减小和内部固定对待我损伤中心回顾地被分析。脚(antero以后、侧面、倾斜的看法)和脚关节的外科手术前、手术后的拍(antero以后，侧面并且榫眼看法)被获得。病人被跟随在上面放射学地并且机能上地(脚功能索引，FFI)在3以后，星期，6个星期，3个月，6个月然后annually.ResultsThere是五压碎破裂并且三砍破裂(二sagittal砍并且一个花冠砍)，与5年的平均后续。没有早复杂并发症在这些病人被注意。迟了的复杂并发症在四个病人在talar身体的六个病人和osteonecrosis包括了subtalar/ankle关节的osteoarthrosis。在功能的评价以后，在5年以后的吝啬的FFI是104.63个点，更坏的结果在压碎损害和花冠被注意砍破裂。Sagittal砍破裂有对通过手术对待的talar身体破裂随后的复杂并发症是的好功能、放射学的outcome.ConclusionsLate不可避免尽管准确减小和僵硬固定被完成，因此，病人们应当关于不利结果被建议。尽管压碎和花冠砍，破裂有差的结果，sagittal损害在长期的评估上有好预后。

简介：Thefracturetoughnessofhardbiomaterials,suchasnacre,bovinehoofwallandbeetlecuticle,isassociatedwithfibrousorlamellarstructuresthatdeflectorstopgrowingcracks.Theirhardnessandreducedmodulusweremeasuredbyusingananoindenterinthispaper.Micro/nanoscalecracksweregeneratedbynanoindentationusingaBerkovichtip.Nanoindentationofnacreandbovinehoofwallresultedinpile-uparoundtheindent.Itwasfoundthatthefracturetoughness(KC)ofbovinehoofwallisthemaximum,thesecondisnacre,andtheelytracuticleofdungbeetleistheleastone.

简介：一个有力的数字模型的发展长有模仿具体材料的破裂行为是在地震工程的主导的研究区域之一。一个可靠模型应该能足够地代表裂缝的不连续的特征并且在复杂装载条件下面模仿各种各样的失败行为。在这篇论文，数字明确的表达，它合并一个复杂僵硬塑料的接口联合弄软的结合的组成的模型，接触，磨擦并且砍膨胀进XFEM，被建议描述具体材料的各种各样的裂缝行为。为精确地在断绝的双方上装配贡献到弱形式的一个有效数字集成计划被介绍。建议方法的有效性被模仿几著名试验性的测试估计了。数字方法罐头成功地捕获裂缝路径并且精确地预言具体结构的破裂行为，这被结束。混合模式破裂行为上的mode-II参数的影响进一步被调查更好决定这些参数。

简介：ThispaperstudiesRabinovitch'scompressionexperimentsongraniteandchalkandproposesanoscillatingdipolemodeltoanalyseandsimulatetheelectromagneticradiationphenomenoncausedbyfractureofrocks.Ourmodelassumesthattheelectromagneticradiationpulsesareinitiatedbyvibrationsofthechargedrockgrainsonthetipsofthecrack.Thevibrationsoftherockgrainsarestimulatedbythepulsesofthecracks.OursimulationsshowcomparableresultswithRabinovitch'scompressionexperiments.Fromthesimulationresults,itverifiesanassumptionthatthecrackwidthisinverselyproportionaltothecircularfrequencyelectromagneticradiation,whichispresentedbyRabinovitchetal.Thesimulationresultsalsoimplythat,byusingouroscillatingdipolemodeltogetherwithRabinovitch'stwoequationsaboutthecracklengthandcrackwidth,wecanquantitativelyanalyseandsimulatetheelectromagneticradiationphenomenon,whichisinducedfromthefractureoftherocks.

简介：模型我伪静电干扰铝泡沫的非线性的骨折被考虑显微镜的异质的效果分析。第一，连续统组成的模型被收养说明金属性的泡沫的塑料压缩的可能性。二参数的Weibull类型功能建模的收益紧张在组成的模型被采用。然后，一个修改连贯的地区模型被建立在起始的裂缝前与一个连贯的地区描绘铝泡沫的破裂行为。张力的拖拉对本地裂缝开始排水量关系被采用描述材料的弄软的特征。并且为衔接破裂过程地区被用于考虑铝的显微镜的异质的在内的应力的山峰的一个Weibull统计模型起泡沫。最后，压力紧张的曲线上的随机的参数的影响被给。数字例子被给说明在这篇论文介绍的数字模型，J积分上的Weibull参数和材料性质的效果被讨论。

简介：Usingultrasonicguidedwavestoassesslongbonefracturesandfracturehealinghasbecomeapromisingdiagnosticissue.Butthemultimodeoverlapoftheguidedwaveschallengesthequantitativeevaluationandclinicalapplication.Inthepreformedstudy,inordertosimplifythesignalinterpretation,thelow-frequencysinusoidialsignalswereusedtoonlyexciteS0andA0modesinfracturedlongbones.TheamplitudesofS0andA0modeswerenumericallyanalyzedwithvariationincrackwidthandfractureangle.Numericalsimulation,basedonthetwo-dimensionfinite-differencetime-domain(2D-FDTD)revealsthatbothS0andA0amplitudesdecreasewiththefracturewidening.However,theincreaseinfractureanglegraduallyenhancestheA0amplitude,whilewithrespecttotheS0mode,itsamplitudeshowsanon-monotonictrendtothevariationinfractureanglewithaturningpointaround45°.TheamplituderatiobetweenS0andA0canreflectthevariationsincrackwidthandfractureangles.ThesimulationillustratesthatultrasonicguidedS0andA0modesaresensitivetothedegreeofbothverticalandobliquefracturesinthelongcorticalbone.Thesefindingsmaybehelpfulforfracturesdiagnosisandhealingevaluationofthelongbone.

简介：Bymeansofreasonableassumptionandmathematicalderivation,atheoreticexpressionofflowrateforasinglefracturewithlinearlyvaryingwidthwasobtained.Themathematicalderivationwasbasedonthecubiclawandthenewtheoreticexpressionwasanextentionoftraditionalparallelplatemodel.Thisstudymayhelptoanalyzeseepageinfracturedrockmass.

简介：吸收材料(静态存储器)的一架新奇结构的雷达，给正常树脂底composites新功能，被准备。静态存储器的动态压缩测试借助于裂口Hopkinson压力酒吧(SHPB)在在里面飞机和composites的正常方向被执行。在沿着在里面飞机方向的压缩测试，失败发生在在纤维和矩阵之间的接口。一个破裂模式和机制被建议解释这些结果。吸收粒子的增加导致压缩性质的恶化。然而，有吸收性质的雷达的静态存储器的压缩力量上没有明显的减少。

简介：Hydrogenembrittlementisoneofthekeyissuesforthevanadiumalloysforfusionapplication.PreviousstudyhasshownthatV4TialloyhadbetterpropertiesagainsttheembrittlementthanV4Cr4TiandV4Ti3A1alloys.Itwasthoughtthatthebetterpropertywasbenefitedfromthesmallratioofitsyieldstrengthoveritsultimatetensilestrength.

简介：Ｒｅｓｅａｒｃｈｏｎｐｒｏｂａｂｉｌｉｔｙｏｆｓｅｉｓｍｉｃｃｒｉｔｉｃａｌｉｎｓｔａｂｉｌｉｔｙｏｎｂａｓｉｓｏｆ＇＇ｆｒａｃｔｕｒｅｃｏｌｌｕｓｉｏｎ＇＇ｍｏｄｅｌＳＨＩ－ＹＯＮＧＺＨＯＵ１）（周仕勇），ＬＩＮＧ－ＲＥＮＺＨＵ１）（朱令人），ＭＡ...

简介：Thisstudyconcernsatwo-dimensionalmodelandthecorrespondingvirtualcrackclosuretechnique(VCCT)implementedtosolvethegeneralboundaryvalueproblemsthatmayexplainwhyinterfacediscontinuityhaseffectsonthefracturebehaviorinthesuperconductor-substratesystem.Theinterfacialdiscontinuitycanbeclassifiedaccordingtothematerialproperties'continuityandtheirderivatives'continuityattheinterface.Fornonhomogeneoussuperconductorandsubstratespecimenswithvariousmaterialproperties,aVCCTmethodisdevelopedtocalculatetheirfracturebehavior.Furthermore,theeffectsofappliedmagneticfieldamplitudeandnonhomogeneousparametersareextensivelyandparametricallystudiedintwoactivationprocesses(zero-fieldcoolingandfieldcooling).Theintegrativeandcomputationalstudypresentedhereprovideafundamentalmechanisticunderstandingofthefracturemechanisminthesuperconductor-substratesystemandshedslightontherationaldesignofinterfacialcontinuity.

简介：

简介：Themultilayered7XXXseriesaluminumalloywasimpactedby7.62mmogivalprojectilesatvelocitiesrangingfrom787to851m·s~(-1).Thedeformedmicrostructureundervariousimpactingvelocitiesandfracturesurfacesofdifferentsectionswereinvestigatedatdifferentphysicalscalestodeterminetheprocessoffailure.Opticalmicroscopy(OM),electronback-scattereddiffraction(EBSD)andscanningelectronmicroscopy(SEM)wereusedintheinvestigation.Theresultsshowthatcraterisconstrainedinthe7B52frontlayerandtwotypesofadiabaticshearbandswhicharetransformedbandsanddeformedbandsanddifferenttypesofcracksareobserved.Spallfractureisthesignificantfailuremodeof7B52frontlayer,andtheresultingdelaminationleadstothepresenceofbendingtensilefractureinsteadoftheshearplugging.Theductile7A01layerbluntsanddeflectsthespallcracktips,preventingthetargetsfromfullspall,andinducesaconstraintof7A52rearlayer.Theleveloftheconstraintdeterminesdifferentfracturemodesof7A52layer,accountingfortheasymmetryofdamage.

简介：Objective:Toobservetheeffectofoctyl-a-cyanoacrylateuponbonehealinganditsdegradationinvitroaftermiddletibialtransversefractureinrabbits,andtoestablishtreatmentofhigherefficacywiththeapplicationofoctyl-a-cyanoacrylate.Methods:MiddletibialtransversefracturemodelofNewZealandrabbitswasestablished.Intheexperimentalgroup,internalfixationwith2mmKirschnerwireswasperformedandthebrokenendswerefixedwithoctyl-a-cyanoacrylate.Inthecontrolgroup,onlyinternalfixationwith2mmKirschnerwireswasconducted.Animalswerekilledatpresettimeintervalsof2,4,6,8,10and12weekspostoperativelyandsampleswereharvested.Results:Twoweeksafteroperation,clearfracturelineswereobservedinboththeexperimentalandthecontrolgroups.Fibroussofttissueconnectionwasnotedbetweenthebrokenendsandtherewassofttissueadhesionaroundthefracturesite.Therewasnocallusformationandthebrokenendsweresurroundedbyadhesivesofttissues.Obviousexternalcallusformationwasconfirmedat8weeksafteroperationinbothgroupswithpartialdisappearanceoffracturelines.Tenandtwelveweeksaftertheoperation,fracturelinesdisappearedcompletelyandtherewasobviousexternalcallusformationandboneunion.Inthefourthweek,fibrouscellsandchondrocyteswerefoundtogrowintothecolloidandsurrounditatthe6thweek.Theadhesivematerialwasdegradedandgraduallyabsorbedatthe8thweek.Chondrificationwasobserved.Conclusions:Twoweeksafterfixationfortibialfractureinrabbits,octyl-a-cyanoacrylatebeginsinvivodegradation.Chondrocytesandfibrocytesgraduallygrowintothedegradationareaandsurroundtheadhesivematerial,whichbrokeintopiecesat8weeks.Completedegradationanddisappearanceoftheadhesivematerialispresentbetween10and12weeks.Nobarriereffecthamperingfracturehealingisnoted.

简介：Jep积分为描绘有弹性塑料的材料的破裂行为被导出。Jep积分不同于米饭J积分因为工作的免费精力密度而非压力密度被采用定义精力动量张肌。Jep积分被证明不管增长粘性和变丑粘性是路径依赖者。Jep积分拥有清楚地清楚的物理意思：(1)在包围裂缝尖端的无穷地小的轮廓上评估的价值Jtipep代表裂缝尖端精力驱散；(2)当全球steadystate裂缝生长条件被接近时，沿着边界轮廓计算的Jfar-ssep的价值等于到裂缝尖端驱散和塑料地区的体积驱散的和。理论结果被模仿我击碎的模式验证问题。

简介：Themovementofwaterflowinunsaturatedfracturedrockwasinvestigatedwiththesandstonesamplethroughexperimentalresearchandnumericalsimulation.Theexperimentalresultsshowthatthearrivingtimeofwettingfrontisdelayedbythefracture,resultingintheincreaseofwatersaturationinthedomainontheupstreamsideofthefracture,whichwilllocallyenhancewaterflowthroughthematrix.Thenumericalsimulationwiththefinitevolumemethodcaptureseffectivelythesecharacteristics.Thecomparisonbetweensimulatedandobservedtraveltimeandarrivingtimeofwettingfrontshowsthattheirdifferenceareverysmallandthesimulatedresultsareinagreementwiththeobservedresults,whichimpliescalibratedparametersarereliableandeffective.Thenaccordingtothecalibratedparameters,fracturedmodelswereestablishedtoexaminehowthechangeoflargefracturedaperturewouldaffectthearrivingtimeofwettingfronts,pressureheadsandwatersaturationontheupstreamanddownstreamsidesoffracture.

简介：Crackopeningdisplacement(COD)wasappliedtocharacterizethefractureinitiationofthetoughhighdensitypolyethylene.Normalsinglesidenotchedthree-pointbendspecimensandsilicarubberreplicatechniqueswereusedtostudythecharacteristicCODofhigh-densitypolyethylenepipeanditsbutt-fusionjointsincludingtheweldfusionzoneandheataffectedzoneatdifferenttemperaturefrom-78℃to20℃.TestingresultsshowthatthecharacteristicCODappearstodependonthestructuralfeaturesthataredeterminedbyweldingprocessandthetestingtemperature.Asthetemperatureislowered,thecharacteristicCODofallzonesstudieddecreases.Becausetheweldingprocesssignificantlychangessomestructuralfeatureofthematerial,characteristicCODoftheweldfusionzoneisthesmallestoneamongthoseofthethreezones.TheresultscanbeusedfortheengineeringdesignandfailureanalysisofHDPEpipe.

简介：探索临床的特征和风险因素的目的在受不了骨质疏松症相关的破裂以及有效干预的病人重新断裂。从2006年1月的方法到2008年1月，我们的医院里的门诊病人和住院病人是超过50岁并且受不了骨质疏松症相关的破裂的人，为这研究被选择。他们被划分成破裂组并且重新断裂组。重新断裂率被跟随在上面为2，年，11个病人在期间发展了重新断裂，因此在重新断裂组被包括。因此，273个病人，225个第一破裂的盒子，变老(67.7

简介：TheMayangCudeposit,westernHunanisamiddle-scalesandstone-typeCudepositpredominantofnativecopper.Fromanangleofgeologicalintegrativefield,fracturegeochemicalfeaturesarestudidedanddiscussedinthispaper.Infracturestructure,variantregularityandtheratiosofelementcouplesparticipatinginmetallogensisthattheirgeochemicalnaturesaresimilarorstronglycorrelative,revealchanginglawsofmetallogenictemperatureandpressurefieldsandmigratingdirectionofmetallogenicelements.Thetheoreticalstudytalliesmuchbetterwithproductivepractice.Theyaremeaningfultoconductprospectingandexployation.

简介：破裂和劈开实验的一个特征是他们通常是内在地破坏的。裂缝完全不在一个不着重的系统愈合，甚至在象云母那样的晶体。这里，我们使用了为非破坏性的劈开和易碎的破裂实验由磁性的脱衣组成的磁性的固体。在磁性的脱衣之间，有不同机械特征的材料能被插入，例如特氟隆重或泡沫脱衣，到变化固体的机械性质。为劈开实验，我们开发了象主要深奥力量那样的参数能容易被测量的一台仪器。由插入缺陷，磁性的固体能在动态破裂实验被使用，与肉眼可见地模仿以一个更容易的方法的一个非破坏性的实验的优点，与高得多的速度发生在真实材料。仪器和使用的磁性的固体可能为在班上的破裂的示范是有用的。