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The Fourier series method was extended for the exact analysis of wave propagation in an infinite rectangular beam. Initially, by solving the three-dimensional elastodynamic equations a general analytic solution was derived for wave motion within the beam. And then for the beam with stress-free boundaries, the propagation characteristics of elastic waves were presented. This accurate wave propagation model lays a solid foundation of simultaneous control of coupled waves in the beam. 相似文献
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IntroductionAsawell-establishedandsophisticatednumericalanalysistechniqueforthedifferentialequahons,thefiniteelementmethodwasoriginatedindependentlybythedomesticandtheforeignmechanicalinvestigatorstheyyearsago.ItfoundforthefirsttimewideapplicationsintheelasticstfUctolproblemsandwiththedevelopmentofcomputerextendedinvaryingdegreestOalmostalltheengineeringdisciplinesandmanyscientificandtechnologicalfields.Thisleadstoadramaticbreakthroughforthecurrentcomputationalmathematics.Themathematicalbasis… 相似文献
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热致相分离聚丙烯微孔膜 总被引:7,自引:0,他引:7
对聚丙烯-稀释剂体系热致相分离过程制备聚丙烯微孔膜的意义、原理、过程及研究现状进行了评述。 相似文献
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Reissner厚板弹性弯曲的一般解析解 总被引:6,自引:2,他引:4
针对大型工程建设中的Reisner厚板弹性弯曲问题,本文采用复级数方法求解相应的常系数偏微分方程组的边值问题,并首次得到了任意边界条件下的一般解析解.该解形式简单,计算方便、可靠.以四边简支和三边固支一边自由两种支撑条件下厚板承受均布载荷为例进行了分析验算,与已有的计算结果相比,计算结果相当满意.同时本文还着重对解的收敛速度、正确性(合理性)及边界满足情况进行了考察. 相似文献
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I.GeneralAnalyticSolutionforThickRectangularPlates1.1BasicequationsandboundaryconditionsTheoryofthewidelyusedReissuerplatesisquiteaccurateforengineeringcomputationand,asisshowninFig.l,ithasthefollowingassumDtionsfa)AthickrectangularplatewithmaterialpropertiesofelasticmodulusE,Poisson'sratiop,shearmodulusGanddimensionsofainlength,binw.idth.hinheightisconsiderd.anditsstrainsandstressescanbedescribledinthedeflectionofthemid-planeWandrotationsaroundx-axisandJ.-axisAandac,respectively.b)Thepl… 相似文献
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Reissner厚板弹性弯曲的理性有限元法 总被引:2,自引:0,他引:2
本文在非协调元的修正泛函中引入满足系统微分方程的单元变形模式,提出了一种将解析方法与数值方法有机结合的理性有限元法。这种新的计算方案合乎单元的力学要求和结构的几何复杂性要求。据此所得的厚板弯曲四边形单元具有计算精度高、可对刚度矩阵精确积分等优点。 相似文献
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