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蠕变模型     
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  creep model
     Singh-mitchell creep model of Shanghai very soft silt clay
     上海淤泥质粉质粘土的Singh-Mitchell蠕变模型
短句来源
     Study on nonlinear creep model of soft rock
     软岩非线性蠕变模型研究
短句来源
     Study on the Creep Model of Thermoplastic Polymer Film
     热塑性高分子薄膜蠕变模型的研究
短句来源
     By Mesri creep model, using the Mindlin stress formula to calculate the stress induced by the load of pile; and using Boussinesq stress formula to calculate the stress induced by the load of raft;
     采用Mesri蠕变模型描述土体的蠕变行为,用桩的Mindlin应力公式计算桩端和桩侧荷载在桩端平面以下产生的附加应力,用Boussinesq应力公式计算承台分担荷载产生的应力。
短句来源
     4. Referring to the calculating results of the 4-component model, the feasibilities of the three models are compared, and the 3-component model is considered as the optimum creep model.
     4.结合四元件模型的计算成果,对三种蠕变模型的实际应用进行了比较,初步认为三元件模型为研究堆石变形时间效应的较优蠕变模型
短句来源
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  creep models
     By introducing Singh-Mitchell creep equation,the drained and undrained creep models of soft soil are proposed,in which exponential function is adopted for stress-strain relationship and power function for strain-time relationship.
     引入Singh-Mitchell蠕变方程,建立了珠江三角洲软土排水和不排水的Singh-Mitchell蠕变模型,其中应力-应变关系采用指数函数,应变-时间关系采用幂函数。
短句来源
     2. The cause of deformation and creep mechanism of fill-up component were analyzed And the theoretical and practical analysis on the creep models ofwere performed, a four element Schiffman model was selected to simulate thecreep effect of the fill-up component.
     2、对堆石的变形成因及其蠕变机理进行了简要的分析,并从理论与实践方面对蠕变模型进行了评述与分析,选用四元件的薛夫曼(Schiffman)模型来模拟堆石的蠕变。
短句来源
     According to the typical components of MSW in Chongqing City, the authorsconfect samples for creep compressive test indoors. By means of loading respectively, aseries of testing curves are achieved. Then two kinds of creep models called HK Modeland PTH Model are established based on the Theory of Creep Model and the testing data.
     以分别加载的方式,对以重庆市城市生活垃圾典型组分为依据配制的垃圾试样进行了不同应力水平的室内压缩蠕变试验,进而根据蠕变元件的基本性质和试验过程中试样反映出的变形特征建立了适合于城市生活垃圾变形特点的两种蠕变模型——HK模型和PTH模型,总结得出了模型的蠕变方程式和基本参数。
短句来源
     The rutting prediction method for steel bridge deck with thermal-plastic asphalt mixture surfacing is proposed by the creep models provided by current FEM ANSYS software and layer-strain method,and its parameters are investigated.
     本文利用通用有限元ANSYS软件提供的蠕变模型和层-应变法,提出了钢桥面热塑性沥青混合料铺装车辙预估方法,并研究了车辙预估模型中参数的确定方法。
短句来源
     With the creep models of rock and joints obtained by back analysis for experiment data the influence of some parameters on uniaxial creep of rock mass cut by three sets of intersected joints is analyzed.
     根据反演出的岩石和节理蠕变模型,计算了含三组相交节理的岩体在单轴应力作用下一些节理参数对岩体单轴蠕变的影响。
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  “蠕变模型”译为未确定词的双语例句
     The rheologic model of soft rock has been discussed, the expansion and rheologic behavior for soft rock has been studied, based on the combination of experiment and numerical analysis.
     本文讨论分析了软岩流变模型,通过实验与数值分析相结合,对软岩的膨胀特性及蠕变特性进行了研究,探讨了软岩的膨胀机制,建立了软岩的蠕变模型
短句来源
     Based on the displacement data obtained from the model tests, a displacement reverse analsis on the creepage of the frozen wall, a problem of multiple parameters, is realized by means of the finite element method.
     本文以冻结壁蠕变模型试验获得的位移为已知条件,综合分析了各位移量之间的关系后,借助于有限元法,采用多目标函数及待分析参数分组的分步反分析法,实现了冻结壁蠕变这一多参数问题的位移反分析。
短句来源
     Statistic Modeling of the Creep Behavior of Metal Matrix Composites Based on Finite Element Analysis
     基于有限元的金属基短纤维复合材料MMC的一种统计蠕变模型
短句来源
     Method of Determine the Parameters of Finite Element Model of Creep Deformation
     软粘土蠕变模型有限元参数的评价方法
短句来源
     The parameters of the model are determined by rheology test data.
     通过绿片岩流变数据对新的非线性蠕变模型的参数进行辩识,得到了蠕变模型的材料参数。
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  creep model
On the long-term strength of metals and the ideal-creep model
      
Scaling of the current-voltage characteristics of superconducting films in the flux creep model
      
The experimental dependences R(T) are analyzed within the Ambegaokar-Halperin model of thermal fluctuations in Josephson junctions and the flux creep model.
      
In the range of strong magnetic fields (from 103 to 6 × 104 Oe), the dissipation obeys the Arrhenius law R ~ exp(-U(H)/T)], which is characteristic of the flux creep model with a temperature-independent pinning energy U(H).
      
Recognition of creep model of layer composite rock mass and its application
      
更多          
  creep models
It is found that in this case, it is not necessary to introduce any crossover from plastic creep to elastic creep models at the fishtail line.
      
Three deviatoric creep models, the single dash-pot, the Maxwell, and the three-parameter model are considered.
      
Comparison of these predictions with those based on creep models incorporating only diffusional flow are made.
      
The possible creep mechanisms involved in high temperature creep deformation of single crystal oxides are discussed by comparing the collected creep data with theoretical creep models.
      
The Θ-Projection and Garofalo creep models describe the variations of the creep curve shape at different temperatures and stress levels reasonably well.
      
更多          


In this paper a stability and deformation analysis of underground opening surrounded by non-linear visco-elastic rock masses is given. Non-linear stress-strain relationship associated with Burgers Model of creep deformation is used as the mathematical model. For calculation, the finite element method based on the Galerkin weighted residual principle is adopted, by using quadrilateral isoparametric elements. In the course of computation the sequence of excavation has been considered and the so-called stress transfer...

In this paper a stability and deformation analysis of underground opening surrounded by non-linear visco-elastic rock masses is given. Non-linear stress-strain relationship associated with Burgers Model of creep deformation is used as the mathematical model. For calculation, the finite element method based on the Galerkin weighted residual principle is adopted, by using quadrilateral isoparametric elements. In the course of computation the sequence of excavation has been considered and the so-called stress transfer technique for elements, over-stressed either by shear stress or by tensile stress. has been adopted. The computation procedure are as follows. 1) Determine the initial stress {σ_0} in the rock.The calculation is proceeded with non-linear stress-strain formula by iteration method. 2) Assume the initial displacement of the rock to be xero {D_0}=0 and use middle increment method to calculate the stress increment {△σ_I}, strain increment {d△ε_I} and displacement increment {△D_I}. Then superimpose to corresponding initial value to obtain the instantaneous non-linear elastic stress,strain and displacement at the end of the first stage of excavation; 3) Compute the stress level to find out the extent of the plastic zone developed in the rook. 4) For elements with principal tension stresses, no tension analysis would be employed,and for elements with over shearing stresses, the analysis of no over shearing stress would be employed to calculate the modified displacement {D_I}, stress {σ_I}, strain {ε_I} and stress level of the first stage of excavation; 5) Divide the time into steps △t_1. △t_2.......and calculate redistribution of stresses induced by rheologic change. Consequently the displacement, stress, strain are worekd out till the beginning of the second stage of excavation. 6) For the second stage of excavation,apply the same procedures as 1)—5) to obtain the stress {σ_I}, strain {ε_I} and displacement {D_I} for this stage. The calculation would be conducted for further stages in the same way. Two illustrative examples are given.It is shown that the results obtained by the method proposed in this paper are quite different from those by linearly elastic theory. Method in this paper, comprehensively taking many factors into account, is claimed to be more rational. With the aid of the computer program, it can be used to calculate stress, strain, displacement and stability of rock surrounding opening of any shape either with or without homogeneity. With some slight modification, this method can also be used to solve geotechnical problems concerning seepage flow,joint, stratification and faults.

本文对非线性和粘弹性岩体内地下洞室围岩作了稳定和变形分析。作为数学模型,采用了与鲍格斯(Burgers)蠕变模型相结合的非线性应力应变关系。在计算中,应用了以伽辽金(Galerkin)加权余量法原理为基础的有限单元法,取用四边形等参数单元。计算过程中考虑了洞室分期开挖施工的顺序,并用所谓的应力迁移法对产生的单元超余剪应力和拉应力作了处理.

The intercalated clay layer is a weak intermediate clay layer. It was formed from thin layers of soft clayrock after being crushed by bedding slip and weathered by the physics-chemical process of groundwater. The special genesis of intercalated clay layers makes their microstructure and mechanical properties differ from those of natural clay. We have cut down a number of undisturbed samples with success from the sandstone-shale system by means of cutting machine, and conducted drained ah ear creep tests to study...

The intercalated clay layer is a weak intermediate clay layer. It was formed from thin layers of soft clayrock after being crushed by bedding slip and weathered by the physics-chemical process of groundwater. The special genesis of intercalated clay layers makes their microstructure and mechanical properties differ from those of natural clay. We have cut down a number of undisturbed samples with success from the sandstone-shale system by means of cutting machine, and conducted drained ah ear creep tests to study their creep behavior and equation. Meanwhile, we have also examined the change of their microstructure during creep by scanning electron microscope. According to the test results, we established perimental equations for intercalated clay layers, we found that the curve-fltting expression for primary creep stage are power laws of the form r=at~, n is a positive constant less than 1, or_1 they can be approximated by r_1=(1-exp-()). For the steady state of creep, the creep can be represented by the equation r_2=r_(min) t, and for accelerated creep, the famous pure Saito′s Relation is fit. The equation is r_3=c+dln[(t_1-t_2)/(t_1-t)]. On the basis of the above empirical equations,we worked out a complex model of creep. By combining a Kelvin model and a Bingham model in series, we obtained a complex model which could reprent the primary and steady state creep stage. A special dashpot having two swiveling holey piston is used to describ the change process of viscosity η_3 during accelerated creep stage. Combining the dashpot and Kelvin-Binghan model in a special way, we got a complex model of the whole creep process. By examining the change of microstructure during creep, we found that the structure hardening and structure softening processes exist simultaneously in the whole process of creep. In the stage of primary creep, the hardening is dominant then it becomes equilibrated with structure softening during steady state creep. Finally, the structure softening becomes dominant in accelerated creep stage up to failure.

本文采用陈宗基教授建议的方法对构造泥化夹层进行了恒温、饱水剪切蠕变试验,并将所得蠕变曲线划分为A、B两种类型,通过对大量试验结果进行线性变换,得出蠕变各阶段的经验方程。它们在初始蠕变阶段为幕函数及负指数函数形式;等速蠕变阶段为线性函数;加速蠕变阶段为复杂的对数函数形式,为了探讨这些方程的物理涵义,文中又将经验方程进一步抽象为蠕变模型,模型中采用一变η的牛顿筒来描述加速蠕变阶段,并给出了计算模型中各参数的程序框图。文中还研究了泥化夹层天然微结构及其在各蠕变阶段的变化,并通过这些研究对蠕变的机制作了初步分析。

The Intraplate fault network is a dynamic system with the dissipative structure properties, which moves to the stable state through thc self-organization process. The normal and inherited motion of faults is an image of the stable state of system. The nonlinear rheological model of rock, combining with practie observation data, can reliably give the image about the stable state of fault network system. It is undoubted that anomaly is departure from stable state, and that there are fault-motion anomalies with...

The Intraplate fault network is a dynamic system with the dissipative structure properties, which moves to the stable state through thc self-organization process. The normal and inherited motion of faults is an image of the stable state of system. The nonlinear rheological model of rock, combining with practie observation data, can reliably give the image about the stable state of fault network system. It is undoubted that anomaly is departure from stable state, and that there are fault-motion anomalies with both source-precursor and field-precursor proporeties in intrapate fault network. During the process of moving towards the stable state, the system shows a time-space coordination of anomalies, which can provide a way for prediction of earthquake.The colonial anomalies made of information combination are more reliable than the sole anomaly and have more clcarly physical significance. In this paper, the indicex of distinguishing anomaly and some criterions about information of earthquake elements are presented concretely.

板内断层网络是一个具有耗散结构性质的动力学系统,它通过自组织过程走向稳态。断层正常的继承性运动,是系统稳态的映射。岩石流变非线性蠕变模型结合实际观测,能可靠地给出稳态映射。异常是对稳态的偏离,存在着“源兆性断层运动异常”与“场兆性断层运动异常”。系统在趋稳过程中的异常时空协同性,为地震预报提供了途径。 通过信息合成得出的群体异常,其可靠性显著高于个体异常,并具有更为明确的物理意义。具体给出异常判别指标及提供地震要素信息的某些判据。

 
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