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简介：用碳纤维做的射弹合成材料壳和金属弹头以336m/s，447m/s和517m/s的速度渗透具体目标。角度在之间目标表面和射弹轴垂直是0°和30°。具体目标的厚度是200公里，耐压强度是30MPa。试验性的结果显示合成材料结构的力量高。没有纤维分离和破裂，合成射弹能通过具体目标。百分比充满在合成材料射弹是18.5%。它作为金属射弹的在附近两次，如果金属的密度作为7.8g/cm3被拿。与金属射弹作比较，低密度，合成材料能减少的高张力射弹重量，改进雷管的费用重量比率并且提高破坏粉末。

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简介：Thestudyofthebehaviorofconcreteunderbiaxialstressesisessentialtothedesignofoffshoreconcreteplatforms.Usingthemultiaxialtestapparatusdevelopedbytheauthors,thedeformationandstrengthofconcreteunderbiaxialstressesarestudiedexperimentally.Basedonthetestdata,anendochronicdamageconstitutivemodelandafailurecriterionareproposed.Accordingtotheabovemodel,anincrementalnonlineariterativeprogrammeisdeveloped,andaplatesampleinplanestressstateisanalyzed.

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简介：Shakingtabletestsofa1:10scalearchmodelperformedtoinvestigatetheseismicbehaviorandresistanceofconcretefilledsteeltubular(CFT)archstructuresaredescribedinthispaper.TheEl-CentrorecordandShanghaiartificialwavewereadoptedastheinputexcitation.Theentiretestprocesscanbedividedintothreestagesdependingonthelateralbraceconfigurations,i.e.,fully(five)braced,twobracesremoved,andallbracesremoved.Atotalof46tests,startingfromtheelasticstatetofailurecondition,havebeenconducted.Thenaturalvibrationfrequencies,responsesofacceleration,displacementandstrainweremeasured.Fromthetestresults,itisdemonstratedthattheCFTarchstructuresarecapableofresistingseveregroundmotionsandthatCFTarchesofferacrediblealternativetoreinforcedconcretearches,especiallyinregionsofhighseismicintensity.

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：<正>Establishedin1998,BabycareConsultingCo.Ltd.(hereinafterreferredtoasBabycare)isanew-typeenterpriseofferingearlyeducationtobabiesandchildrenaged0-6.Inaccordancewiththelawofphysicalandmentaldevelopmentofbabiesandchildren,thecompanydevelopscoursessuchashealthypregnancy

简介：Ｑｕａｎｔｉｔａｔｉｖｅｓｔｕｄｙｏｎｃｈａｒａｃｔｅｒｉｓｔｉｃｐａｒａｍｅｔｅｒｓｏｆａｃｏｕｓｔｉｃｂｅｈａｖｉｏｒｈａｂｉｔｓｉｎｂｕｄｇｅｒｉｇａｒｓ（Ｍｅｌｏｐｓｉｔｔａｃｕｓｕｎｄｕｌａｆｕｓ）Ｊｉｎ－ＣｈａｎｇＪＩＡＮＧ（蒋锦昌）；Ｈ...

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简介：Thecorrugatedpackingispronetobreakdowneasily,whichcanaffectthetowerefficiencysubstantially.Itistheinnerenvironmentofthevacuumdistillationtowerincludingthetemperatureandchemicalnatureoffluidthatleadtothepackingdamage.Thetheoreticalanalysisindicatesthatitistheinnermaterialflowofvacuumdistillationtowerthatleadstothevibrationofpacking,whichcanaffectthecorrosionfatigueofpackingsignificantly.Meanwhile,themodalshapeandinherentfrequencyofpackingunderprestresscanbeobtainedbymeansofmathematicalanalysis.Basedonthetwokindsofanalysis,theflowinducedvibrationandcorrosionfatigueareaccountableforthefailureofpacking.

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简介：By'migrantchildren,'wemeanchildrenlivingincitieswiththeirparentswhoaremigrantsfromthecountryside.UnderthecurrenteducationsystempracticedinChinesecities,theso-called'migrantchildren,'

简介：Thispaperpresentsaprecisesolutiontopredictthebehaviorofsteelfiberreinforcedconcrete(SFRC)underthefourpointbendingtest(FPBT).Alltheforcecomponentsatthebeamsection(beforeandaftercracking)areformulatedbyapplyingtheseassumptions:arealisticstress-strainmodelisusedforconcretebehaviorincompression,alinearresponseisconsideredfortheuncrackedtensionregioninaconcreteconstitutivemodel,andanexponentialrelationshipisproposedasastress-crackopeninginthecrackregionwhichrequirestwoparameters.Thenthemomentcapacityofthecriticalcrackedsectioniscalculatedbyusingtheseforcesandsatisfyingequilibriumlawatthesection.ParametricstudiesaredoneonthebehaviorofSFRCtoassessthesensitivityofthesolution.Finally,thissolutionisvalidatedwithsomeexistingexperimentaldata.TheresultshowstheproposedsolutionisabletoestimatethebehaviorofSFRCunderFPBT.

简介：垫子是在木排和地面之间的小粒的材料的层。在垫子和木排之间的接口的shear行为可以影响上层建筑的地震表演。为了确定，这影响，水平砍在在monotonic并且周期的装载下面的不同垫子材料和具体木排之间的接口上的测试被执行。垂直压力Pv,材料类型和垫子厚度hc作为变量被拿。结论包括：1)在装载的monotonic下面，Pv是最重要的因素；shear抵抗Phmax作为Pv增加，而是抵抗n有一个相反的趋势；2)因为材料在这研究使用了，n从0.40～0.70变化，接口磨擦角度s从20变化