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large-strain
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  大变形
     Large-strain consolidation theory and finite element analysis based on the material description method
     物质描述的大变形固结理论及有限元法
短句来源
     The cone penetration process is numerically simulated by using the large-strain finite element method and a simple theory of interface.
     采用大变形有限元和简单的接触面理论,数值模拟了静力触探的探入过程.
短句来源
     In this paper, a three-dimensional Fast Lagrangian finite difference program (FLAC~3D), which can simulate large-strain deformation and progressive failure, is adopted to study the soil deformation and failure mechanism in EP shield tunnelling.
     本文针对开挖面支护压力控制与隧道地层变形及破坏问题研究需要,采用能够考虑大变形、渐进破坏的三维有限差分(Flac3D)数值计算程序,设计数值模拟试验方案,研究盾构隧道施工中开挖面支护压力控制与掘进引起周围围岩的变形及破坏问题,主要内容如下:
短句来源
     On the basis of the existing large-strain consolidation finite element analysis program (LSCFEA), by using the above theory, program to calculate moistening deformation is worked out and the large-strain description for wetted loess is realized.
     基于已有的大变形有限元固结分析程序(LSCFEA),运用上述理论,编制了相应的黄土增湿变形计算模块,实现了黄土增湿变形的大变形描述。
短句来源
     This paper is an important part of the scientific project <<Large-strain description and numerical imitation analysis for hydrocompaction of loess>>(No.598780401) and the project of western transportation science & technology <> (No.200131881214). Based on large pooling infiltration testing of loess in situ, the characteristic of the infiltration of typical loess is discussed initially.
     本文依托国家自然科学基金项目《黄土湿陷的大变形理论描述与数值仿真分析》(No.598780401)和西部交通建设科技项目《黄土的浸水特性研究》(No.200131881214),通过大规模黄土原位浸水入渗试验,对典型自重湿陷性黄土浸水特性进行了试验研究,初步探讨了黄土浸水入渗特性的规律。
短句来源
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  大应变
     Large-Strain Consolidation Equation and Its Matrix Form Based on Material Configuration
     物质构形下的大应变固结方程及其矩阵表述
短句来源
     Method for Solving Three-Dimensional Nonlinear Large-Strain Problems
     解三维非线性大应变问题的一个方法
短句来源
     On the Theory of Large-Strain and Non-Linear Rheological Consolidation of Soft Clayey Soils
     软粘土地基大应变非线性流变固结理论研究
短句来源
     For the large-strain problem, the paper proposed an effective approach from the finite-strain theory.
     针对杆系结构的大应变问题,从有限应变理论出发进行分析,提出了对该问题的有效处理方法,并且用实例进行了验证。
短句来源
     3D large-strain numerieal simulation of a hexahedral cell with microspherical void is conducted under different triaxial stress state parameter and Lode parameter conditions.
     本文对六面体含球形微孔洞体胞在不同的三轴应力状态参数和Lode参数条件下进行了三维大应变数值模拟分析。
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  “large-strain”译为未确定词的双语例句
     One-dimensional Mathematical Model for Large-strain Consolidation of Dredged-fill Soil
     吹填土的一维大变形固结计算模型
短句来源
     One-Dimensional Large-Strain Consolidation Theory of Spatial and Material Descrlption
     一维大变形固结的空间描述和物质描述
短句来源
     ANALYSIS OF 1-D LARGE-STRAIN CONSOLIDATION CONSIDERING THE SELF-WEIGHT OF SOILS
     考虑土体自重的一维大应变固结分析
短句来源
     It is therefore of great theoretical and practical significances to make carefully and systematically studies on the theories of both small-strain and large-strain consolidation of layered soft clayey soils with non-linear and rheological properties.
     因此系统深入地开展更贴近实际的成层软粘土地基大、小应变非线性流变固结理论研究具有重要理论和实际意义。
短句来源
     It has been shown that the discrepancy between large-strain consolidation theory and small-strain one is increased with the increases of the compressibility of soil and the magnitude of loading.
     研究表明:大、小应变固结理论的差异随土压缩性或荷载的增大而越趋明显;
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  large-strain
The paper formulates a one-dimensional large-strain beam theory for plane deformations of plane beams, with rigorous consistency of dynamics and kinematics via application of the principle of virtual work.
      
Whereas in many investigations it is assumed that the fraction η of the plastic work transformed into heat is constant throughout the deformation process, the fraction η is here derived from thermodynamic considerations in a large-strain setting.
      
Large-strain and finite-rotation nonlinear behavior effects around the crack-tip are included.
      
Deformation microstructures during large-strain plastic working were studied in the pure Cu and Cu-1.5%Ni-0.3%P alloy, the original microstructures of which have been detailed in our companion publication.
      
The large-strain constitutive behavior of cold-rolled 1018 steel has been characterized at strain rates ranging from to 5 × 104 s-1 using a newly developed shear compression specimen (SCS).
      
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In Composites, application of relatively low transverse strains or stresses can lead to locally large strains or stress in the matrix. It is therefore necessary to evalute the strain or stress concentration factors. A simple discussion of strain or stress magnification factors based upon a strength of materials type of approach is given by schulz in 1963. However, Foye 1966 solved the stress concentraton problem by finite element method indicating that the maximam stress concentration in the matrix is far less...

In Composites, application of relatively low transverse strains or stresses can lead to locally large strains or stress in the matrix. It is therefore necessary to evalute the strain or stress concentration factors. A simple discussion of strain or stress magnification factors based upon a strength of materials type of approach is given by schulz in 1963. However, Foye 1966 solved the stress concentraton problem by finite element method indicating that the maximam stress concentration in the matrix is far less than the one that may be inferred from the schulz approximate approach, stress function method are used by H Schuerch 1967 to determine the field of stress concentration produced by cylindrical inclusions in an other wise homgeneous matrix material subject to an applied stress transverse to the inclusion axis. More recently, L.C. Lee, H.D.Conway 1978 using the method by muschelisvili derived the bond stress for composite material reinforced with various arrays of fibers.Results from both schuerch and Lee-Conway also give stress concentration factors several times less than that by Sshulz.All those outined above are surveyed and another model of analysis be proposed to give an approximate solutions of this problem in this study.

单向加劲的纤维复合材料,在正交纤维方向的均布荷载作用下,基体内将出现超过外载强度的局部应力集中。最初有1963年J.C.Schulz提出的研究结果,认为这种应力、应变的集中值可以达到很高。1966年R.L.Foye用有限元素法得到的数值解,说明Shulz得到的数据,有夸大现象。1967年H.Schuerch提出均质平面弹性体(基体)中间具有一个弹性核(纤维)——以下称单核模型——的应力集中理论解;1978年L.C.Lee、H.D.Conway从基体中具有一群核的情况出发——以下称群核模型——得出了一系的数值结果。从后面这两种模型理论结果来看,也可以得出Schulz应力集中系数过大的论断。 本文先扼要介绍Schulz、Schuerch、Lee—Conway的工作。在这些研究工作的基础上,作者提出评论,并建议一个作为一般计算的模型。

Constant angular difference rotational mismatch method of Moire proposed in this paper is suitable for determining the strain states of different points in general non-homogeneous strain field. While measuring elastic or moderate plastic strains, only one analyzer grating with pitch equal to the specimen grating is necesssary and appropriate sensitivity can be attained complete strain solution of constant angular difference rotational mismatch method is derived in exact and simplified expressions. The former...

Constant angular difference rotational mismatch method of Moire proposed in this paper is suitable for determining the strain states of different points in general non-homogeneous strain field. While measuring elastic or moderate plastic strains, only one analyzer grating with pitch equal to the specimen grating is necesssary and appropriate sensitivity can be attained complete strain solution of constant angular difference rotational mismatch method is derived in exact and simplified expressions. The former of which is suitable for either small or large strains. Approach to determine the regions of different variables is proposed in order to measure strains during high sensitivity. The experimental device is designed and the stress concentration test by axial load is accomplished. Good agreement is found in a comparison of the experimental results to the theoretical solution.

本文提出的等差错角云纹法适用于测定任意不均匀应变场各点的应变状态.在测定弹性或不大的塑性应变时,只需用一块与试件栅等节的分析栅而仍有较好的量测灵敏度.文中推导了完全应变解的准确式与简化式,前者对大应变和小应变都适用;还提出了应在灵敏区测量应变及据此确定各变量区间的方法;设计了等差错角定位用的简便实验装置;进行了应力集中实验,实验结果与理论解有较好的符合.

The effect of large strain and high triaxiality farours the initiation and growth of voids in many ductile materials. This causes volumetric dilatation in the plasticity. So, dilatational plastic constitutive equations are proposed as eq. (1) and the inverse form in eq. (4). In which, Etm(p) is the volumetric plastic tangent modulus. When Etm(p)→∞, then yields the conventional Prandtl-Reuss equations. In eqs. (5) and (6) the criteria of strain softening are given, when either of these condition is met Ete(p)...

The effect of large strain and high triaxiality farours the initiation and growth of voids in many ductile materials. This causes volumetric dilatation in the plasticity. So, dilatational plastic constitutive equations are proposed as eq. (1) and the inverse form in eq. (4). In which, Etm(p) is the volumetric plastic tangent modulus. When Etm(p)→∞, then yields the conventional Prandtl-Reuss equations. In eqs. (5) and (6) the criteria of strain softening are given, when either of these condition is met Ete(p) or Etm(p) turns to negative. The six material constants Ete(p), Etm(p), λe,σce,λm and σcm can be calibrated and justified by using the necking tests of axisymmetric bars (with and without notches) and the computer simulation technique. The importance of the dilatational plastic effect and the strain softening is delineated in figs. 5,6,7.

由于大应变和三轴张力的怍用,在许多韧性材料中将出现空洞的形成与扩展,从而产生塑性条件下的体积膨胀。本文提出了一组可以计及这类塑性可膨胀性的本构方程。利用轴对称试棒颈缩实验的结果、空洞模型的分析和计算模拟,可以标定方程中有关的切线模量值。为检验这类本构方程的合理性和核对所标定的模量数值,可再用之分析轴对称试棒的韧性断裂行为,以获取更逼近实验的结果。

 
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