poisson ratio

• To meet the need of settlement calculation with fem when absence of laboratory triaxial test data in common road engineering , methods of determining the five parameters included in tangential elastic module through soil routine tests and the related emendation coefficient are given . at the same time , one approximately substituted formula for tangential poisson ratio is also developed , which is suitable for both sandy soil and cohesive soil . ( 3 ) research on main parameters modification of duncan - chang model based on the improved bp network
  对于一般道路工程中不做三轴试验但须进行沉降有限元计算的情况，给出了依据土体常规试验的切线弹性模量确定方法和相关修正系数，同时也提出了对砂性土和粘性土均适用的切线泊松比的近似替代式子； ( 3 )基于改进的bp网络对邓肯张模型主要参数修正研究。
• It has been found that if the elastic modulus and poisson ratio of granite at normal temperature is used for the calculation of the stress field , the deviation of the results can be as high as 20 % ~ 60 % , the higher the temperature as compared with the results obtained by using the elastic moduli and poisson ' s ratios under the corresponding different temperatures
  通过分析发现，根据常温时花岗岩弹性模量和泊松比计算得到的热应力与根据不同温度下花岗岩弹性模量和泊松比计算得到的结果相比较，随着温度的升高，两者差别从20 %增加到60 % 。
• In this paper , a numerical simulation is conducted , which is based on the test data of the model experiment of sloping ground with the help of the marc program . when the bearing capacity characters of level ground and the foundations adjacent to or above slopes are analyzed , the effect is considered , which includes deformation moduli , density , poisson ratio , angle of internal friction , stress - strain relationship , slope angle , relative distance from the edge of slopes and relative depth of footings
  本文利用斜坡地基模型试验的试验数据，用marc软件进行了斜坡地基模型试验的数值模拟，分析了平地地基、临坡地基和斜坡地基的承载力特性，研究了变形模量、容重、泊松比、内摩擦角、应力应变特性、斜坡坡度、基础的相对坡顶距及其相对埋深等因素对斜坡地基承载力性能的影响。
• When the transportation load is long - term evenly distributed , the influences of each relevant factor , i . e . pipeline depth , diameter , deformation module of foundation , poisson ratio of soil and tyre pressure of vehicles , toward mises stress and vertical displacement of pipelines are discussed . when the transportation load is movable and invariable , the changing rules of mises stress and vertical displacement during the vehicle ' s movement are calculated and analyzed , and effects of vehicle velocity and tyre pressure toward these two mechanical characteristics are discussed . when the transportation load is stable and simple harmonic , the changing rules of mises stress and vertical displacement during the time of load function are calculated and analyzed , and effects of vehicle velocity and tyre pressure toward these two mechanical characteristics are also discussed . in three - dimensional analysis , mises stress and vertical displacement of pipelines under three kinds of transportation loads are calculated , and the analysis and discussion of correlative factors are also made
  当交通荷载为长期均布荷载时，讨论了各相关因素，包括管道埋深、管径、地基变形模量、地基泊松比和车辆轮压大小分别对管道mises应力和竖向位移的影响；当交通荷载为移动恒载时，计算并分析了车辆行驶过程中管道mises应力和竖向位移的变化规律，讨论了车速和车辆轮压对这两个管道力学性状的影响；当交通荷载为稳态简谐荷载时，计算并分析了荷载作用时间内管道mises应力和竖向位移的变化规律，讨论了车速和车辆轮压对管道力学性状的影响。
• Based on the understanding of netative poisson ratio mechanism and the characteristics of liquid crystalline polymers , the ability for the smectic liquid crystalline polymers possibly to bear the auxetic behavior was firstly proposed . at the same time the ideal molecular model was upbuilt and the calculation about the negative poisson ratio of smectic liquid crystalline polymers was theoretically carried out
  经过对负泊松比产生机理和液晶高分子特征的理解，首次提出了近晶c相液晶高分子也具有产生npr效应的能力，建立了近晶c相液晶高分子产生负泊松比的分子模型，并且对其负泊松比进行了理论计算。
• Based on the research of influencing factors and regularities of distribution of loess side slope stability in northwest , the author select pingshuo antaibao southern spoil bank as subject investigated , and abstract several the most rudimental influencing factors which are ubiquitous concerning slope stability in loess area such as sloping shape , slope ratio , bulk density , cohesive force , angle of internal friction , elastic modulus , poisson ratio , water immersion
  本文在探讨黄土地区边坡稳定性的影响因素及其分布规律的基础之上，选取平朔安太堡南排土场为研究对象，抽象出对于黄土地区边坡稳定性具有普遍意义的几个最基本影响因子：坡型、坡比、容重、内聚力、内摩擦角、弹性模量、泊松比、水。
• The secondly , based upon the laboratory soil tests , definite the parameter of the kondner model and the loess compaction model , using fortran power station to compile the finite element programmed of axial symmetry . through trial calculate with the different squeeze stress and different poisson ratio , got some laws of stress of soil surrounding pile and judged the result of compaction pile . the result of the calculation and analysis and valuable to designer and builder
  同时通过室内试验确定了特定区域黄土的邓肯-张模型参数和黄土挤密模型，采用fortranpowerstation ，按轴对称问题编制了存限元程序，通过采用不同的挤压力和不同的泊松比的程序试算，得到了一些桩周土体的应力变化规律，并对挤密桩破坏半径内的土体挤密效果进行了判定，计算与分析结果可供设计施工人员参考。
• The velocity ratio or poisson ratio variaton can be obtained by comparing pn and sn velocities . 3 , in comparing pn and sn velocity variation with geology , we will find that high velocity regions always exist in old stable basin and terra , but low velocity regions lie in active extensional basin , volcano area and magmatic rock regions
  中国大陆上地慢顶部体波速度层析成像3 、将pn波速度和sn波速度横向变化与地质构造对比发现，地震波速高的地区往往是构造上比较稳定的古老盆地、地台等，而地震波速低的地区是在构造上比较活动的张性盆地，火山活动区和岩浆岩分布区。