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Wewillcontinuetoimprovethecompany'sinternalcontrolsystem,andsteadyimprovementinabilitytomanageandcontrol,optimizebusinessprocesses,toensuresmoothprocesses,responsibilitiesinplace;tofurtherstrengtheninternalcontrols,playacontrolpostindependentoversightroleofevaluationcomplyingwiththird-partyresponsibility;toactivelymakeuseofinternalaudittoolsdetectpotentialmanagement,streamline,standardizerelatedtransactions,strengtheningoperationsinaccordancewithlaw.Deepeningtheinformationmanagementtoensurefullcommunicationzeroresistance.ToconstantlyperfectERP,andBFS++,andPI,andMIS,andSCM,informationsystembasedconstruction,fullintegrationinformationsystem,achievedinformationresourcesshared;toexpandPortalsystemapplicationofbreadthanddepth,playinformationsystemonenterpriseofAssistantrole;toperfectdailyrunmaintenanceoperationofrecords,promoteproblemreasonsanalysisandsystemhandover;tostrengtheningBFS++,andERP,andSCM,technologyapplicationoftraining,improveemployeesapplicationinformationsystemofcapacityandlevel.Humanisticcaretoensurezero.TostrengtheningHumanitiescare,continuestofostercompanywindclear,andgasare,andheartShunofcultureatmosphere;strengtheninglovehelpedtrapped,caredifficultemployees;carriedoutstyleactivities,richemployeeslife;strengtheninghealthandlabourprotection,organizationcareerhealthmedical,controlcareeragainst;continuestoimplementationpsychologicalwarningpreventionsystem,trainingemployeeshealthofcharacter,andstableofmoodandenterprisingofattitude,createdfriendlyfraternityofHumanitiesenvironment.Tostrengthenriskmanagement,ensurethatthebusinessofzerorisk.Tostrengthenedbusinessplansmanagement,willbusinessbusinessplanscovertoalllevel,ensurethebusinesscancontrolincontrol;tocloseconcernfinancial,andcoalelectriclinkage,andenergy-savingscheduling,nationalpolicytrends,strengtheningtrack,activeshould;toimplementationState-ownedassetsmethod,furtherspecificationbusinessfinancialmanagement;toperfectrisktubecontrolsystem,achievedriskrecognition,andmeasure,andassessment,andreport,andcontrolfeedbackofclosedringmanagement,improveriskpreventioncapacity.Tofurtherstandardizetrading,andstrivetoachieveaccordingtolaw,standardizeandfair.Innovationofperformancemanagement,toensurethatpotentialemployeeszerofly.Tostrengthenperformancemanagement,processcontrol,enhanceemployeeevaluationandlevelsofeffectivecommunicationtoimproveperformancemanagement.Tofurtherquantifyandrefineemployeestandards...Work,fullplayparty,andbranch,andmembersinfivetypeEnterpriseconstructionintheofcorerole,andfightingfortressroleandpioneermodelrole;tocontinuestostrengtheningfourgoodleadershipconstruction,fullplaylevelscadresinenterprisedevelopmentinthe仿佛顷刻间,亚运就来到了我们身边。一个普通的人,很难想象它背后隐藏着多少人的心血,藏匿着多少人的汗水,背负着多少人的梦想,寄托了多少人的祝愿,在这个激动人心的时刻,在这个万众瞩目的地方ofbackbonebackbonerole;tofullstrengtheningmembersyouthwork,fullplayyouthemployeesincompanydevelopmentintheofforcerole;toimproveindependentCommissionagainstcorruptionworklevel,strengtheningonenterprisebusinesskeylinkofeffectivenessmonitored.,Andmaintainstability.Tofurtherstrengthenpublicityandeducation,improvetheoveralllegalsystem.Wemuststrengthensafetymanagement,establishandimprovetheeducation,supervision,andevaluationasoneofthetrafficsafetymanagementmechanism.ToconscientiouslysumuptheOlympicsecuritycontrols,promotingintegratedmanagementtoahigherlevel,higherstandards,ahigherlevelofdevelopment.Employees,todayislunarcalendaronDecember24,theoxBellisabouttoring,atthistimeofyear,weclearlyfeelthepulseoftheXXpowergenerationcompanytoflourish,tomoreclearlyhearXXpowergenerationcompaniesmatureandsymmetrybreathing.Recallingpastoneanotheracrossarailing,weareenthusiasticandfullofconfidence.Futuredevelopmentopportunities,wemoreexcitingfightmorespirited.Employees,letustogetheracross2013fullofchallengesandopportunities,tocreateagreen,low-costoperation,fullofhumanecareofaworld-classpowergenerationcompanyandworkhard!TheoccasionoftheSpringFestival,mysincerewishthatyouandthefamiliesofthestaffinthenewyear,goodhealth,happy,happy第七章应力状态强度理论一、判断题1、平面应力状态即二向应力状态,空间应力状态即三向应力状态。(√)2、单元体中正应力为最大值的截面上,剪应力必定为零。(√)3、单元体中剪应力为最大值的截面上,正应力必定为零。(×)原因:正应力一般不为零。4、单向应力状态的应力圆和三向均匀拉伸或压缩应力状态的应力圆相同,且均为应力轴上的一个点。(×)原因:单向应力状态的应力圆不为一个点,而是一个圆。三向等拉或等压倒是为一个点。5、纯剪应力状态的单元体,最大正应力和最大剪应力值相等,且作用在同一平面上。(×)原因:最大正应力和最大剪应力值相等,但不在同一平面上6、材料在静载作用下的失效形式主要有断裂和屈服两种。(√)7、砖,石等脆性材料式样压缩时沿横截面断裂。(×)8、塑性材料制成的杆件,其危险点必须用第三或第四强度理论所建立的强度条件来校核强度。(×)原因:塑性材料也会表现出脆性,比如三向受拉时,此时,就应用第一强度理论9、纯剪应力状态的单元体既在体积改变,又有形状改变。(×)原因:只形状改变,体积不变10、铸铁水管冬天结冰时会因冰膨胀被胀裂,而管内的冰不会被破坏,只是因为冰的强度比铸铁的强度高。(×)原因:铸铁的强度显然高于冰,其破坏原因是受到复杂应力状态二、选择题1、危险截面是(C)所在的截面。A最大面积B最小面积C最大应力D最大内力2、关于用单元体表示一点处的应力状态,如下论述中正确的一种是(D)。A单元体的形状可以是任意的B单元体的形状不是任意的,只能是六面体微元C不一定是六面体,五面体也可以,其他形状则不行D单元体的形状可以是任意的,但其上已知的应力分量足以确定任意方向面上的硬力3、受力构件内任意一点,随着所截取截面方位不同,一般来说(D)A正应力相同,剪应力不同B正应力不同,剪应力相同C正应力和剪应力均相同D正应力和剪应力均不同4、圆轴受扭时,轴表面各点处于(B)A单向应力状态B二向应力状态C三向应力状态D各向等应力状态5、分析处于平面应力状态的一点,说法正确的是(B)。Aa=0时,必有a=max或a=minBa=0时,必有a=max或a=minCa+90a及|a|+|90a|为常量D1230Wewillcontinuetoimprovethecompany'sinternalcontrolsystem,andsteadyimprovementinabilitytomanageandcontrol,optimizebus
本文标题:材料力学习题册答案-第7章-应力状态
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