简介:
简介:Theexactformoftheexteriorproblemforplaneelasticityproblemswasproducedandfullyprovedbythevariationalprinciple.Basedonthis,theequivalentboundaryintegralequations(EBIE)withdirectvariables,whichareequivalenttotheoriginalboundaryvalueproblem,werededucedrigorously.TheconventionallyprevailingboundaryintegralequationwithdirectvariableswasdiscussedthoroughlybysomeexamplesanditisshownthatthepreviousresultsarenotEBIE.
简介:Inthispaper,anewnumericalmethodfortheSignoriniprobleminthree-dimensionalelasticityispresented.Theproblemisreducedtoaboundaryvariationalinequalitybasedonanewrepresentationofthederivativeofthedoublelayerpotential.Furthermore,aboundaryelementprocedureisdescribedforthenumericalapproximationofitssolutionandanabstracterrorestimateisgiven.
简介:Constitutiverelationsaregivenforthedescriptionofthedeformationbehaviorofshapememorymaterials.Thedeformationisthesuperpositionoftheelastic,thethermalandthephasetransformationdeformationcausedbythetransformationfromonetotheotheramongthehightemperaturephase,thelowtemperaturephaseandthestressinducedphase.Thephasetransformationiscontrolledbythedrivingforce,i.e.,theGibbsenergydifferencebetweenthephases.
简介:超级哈雷的方法是为解决nonlnear方程的最好已知的第三顺序的重复之一。是这个方法的近似的一个像牛顿的方法被学习。我们的途径产出比它的古典前辈更有效的第四个R顺序反复的过程。我们用复发关系的一个新系统建立一条Newton-Kantorovich-type集中定理,并且给明确的表情为重复的priori错误界限。
简介:摘要:综合岩石取心、砂岩薄片和扫面电镜观察,结合常规物性和压汞实验测试数据分析,对陕北斜坡中部长6段砂岩的岩石学特征、物性特征、孔隙结构特征进行了分析,并从宏观和微观两个方面对储层的非均质性特征做了研究,在此基础上对储层做出分类评价。研究结果表明:长6段储层主体属于细砂岩,砂岩岩性以长石砂岩为主;砂岩孔隙中溶蚀孔占比最高,达79.7%以上,残余粒间孔占比16.2%,其余为少量粘土矿物晶间孔和微裂隙;储层孔隙度平均为9.69%,渗透率平均值为0.7mD,属于整体为致密储层,且孔隙度和渗透率呈正相关关系,属于孔隙性储层;储层孔隙直径平均为40.85μm ,喉道直径平均为 0.61μm,整体为小孔隙-微细喉道类型储层。储层综合评价结果显示:陕北斜坡中部长6段致密油储层类型以Ⅳa、Ⅳb类为主。