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道岔转辙器部分轨接触应力分析.pdf
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西南交通大学硕士研究生学位论文
本文在已有的研究成果基础上，以客运专线18号道岔为例，考虑到尖轨
断面在逆向进岔方向是不断加宽加高的不规则实体，选取磨耗型踏面车轮，
建立起弹性基底约束条件下的道岔区转辙器部分轮轨接触计算模型，对尖轨
基本轨的轮轨接触应力进行较为细致的分析，在轮载过渡区，不仅会发生与
区间相同的“单点接触”和“两点接触”，有时还会出现“三点接触”，垂向
力是以一定的比例从基本轨向尖轨过渡的。
文中对于四个断面的接触应力进行了计算，分别为尖轨顶宽20mm、
触应力的影响分析，包括横移量、摩擦系数、轴重、基底约束条件以及轨下
基础的横向、垂向支承刚度等。为确定容许过岔速度和改进道岔结构设计提
供理论依据。
研究表明，轮轨接触位置即横移量对接触应力的影响最大，其次是轴重。
而摩擦系数、基底约束条件及轨下基础的横向、垂向支承刚度对接触应力的
影响不明显。在过渡区前端，尖轨的侧磨较为严重，为能使车辆顺利通过曲
线，要求车轮踏面有合适的斜度。保证正常状态下车轮与钢轨间不致发生严
客运专线：道岔：转辙器；磨耗型踏面：轮轨接触；有限元法
西南交通大学硕士研究生学位论文
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正在加载中，请稍后...A finite elastic body with a curved crack loaded in anti-plane shear - ScienceDirect
Export JavaScript is disabled on your browser. Please enable JavaScript to use all the features on this page., 1993, Pages Author links open overlay panelShow moreAbstractThis paper presents a Boundary Integral Equation Method (BIEM) for an arbitrarily shaped, linearly elastic, homogeneous and isotropic body with a curved crack loaded in anti-plane shear. The crack must be modeled as an arc of a circle and wholly inside the solid—otherwise its position and orientation with respect to the boundary of the body is arbitrary.The effect of the crack on the stress field is incorporated in an augmented kernel developed for the mode III crack problem such that discretization of the cutout boundary is no longer necessary. This modification of the kernel of the integral equation leads to solutions on and near the cutout with great accuracy. An asymptotic analysis is conducted in order to derive the Stress Intensity Factor (SIF) KIII, at each crack tip, in closed form. In this formulation, a straight crack can be viewed as a particular case of the more general curved crack. In particular, attention is paid to the influence of crack curvature and edge effect on the stress intensity factors at the right and left crack tips. A rigorous mathematical formulation is developed, the main aspects of the numerical implementation are discussed and several representative numerical examples are presented in this paper.Check if you have access through your login credentials or your institution.ororRecommended articlesCiting articles (0)Three dimensional finite element modeling of thermomechanical frictional contact between finite deformation bodies using R-minimum strategy - ScienceDirect
Export JavaScript is disabled on your browser. Please enable JavaScript to use all the features on this page., 16 August 2002, Pages Author links open overlay panelShow moreAbstractAn algorithm for analyzing the transient thermal coupling with the frictional contact between the multiple elastic–plastic bodies in finite deformation is presented using the R-minimum strategy. An arbitrarily shaped contact element strategy, named as node-to-point contact element strategy, is proposed to handle the thermomechanical frictional contact between finite deformation bodies. Assuming the material properties to be temperature dependent, the constitutive equations for both the thermomechanical frictional contact and the thermal-elastic–plastic materials are deduced respectively and applied in our finite element code. Finally, two examples are presented to show the efficiency and usefulness of this algorithm.Keywords142859606584KeywordsThermal-elastic–plastic couplingFrictional contactThermal contactStatic-explicit algorithmFinite elementCheck if you have access through your login credentials or your institution.ororRecommended articlesCiting articles (0)}