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creep     
相关语句
  蠕变
     Study on the Creep Behavior of SnAgCuRE Solder Joints
     SnAgCuRE钎焊接头蠕变行为的研究
短句来源
     Research on Compressive Creep Behavior of the High Aluminum Zinc Based Alloy
     高铝锌合金压蠕变行为研究
短句来源
     Study on the Correlation between Structure and Properties and Mechanism of Good Creep Resistance for PPR Used Pipes
     PPR管材料结构与性能及其高温耐蠕变机理的研究
短句来源
     Study on Tests and Analysis on Theory of Coupled Behaviors of Consolidation and Creep of Soft Clay
     软土固结蠕变耦合特性的试验研究与理论分析
短句来源
     Test on the effect of preliminary cold twist on the creep character of heat resistant alloy ㄌ10ㄒ2ワ
     预加冷扭对抗热合金钢ㄌ10ㄒ2ワ蠕变性质的影响的实验
短句来源
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  徐变
     Analysis of Creep Effect in Prestressed Concrete Bridges
     预应力混凝土桥梁徐变效应分析
短句来源
     Calculation of Prestress Losses due to the Interaction of Shrinkage, Creep of Concrete and Relaxation of Steel
     考虑混凝土收缩徐变和钢筋松弛相互影响的预应力损失的计算
短句来源
     THE CALCULATING METHOD FOR PRESTRESSING LOSSES CAUSED BY THE SHRINKAGE AND CREEP OF PRESTRESSED LIGHTWEIGHT CONCRETE
     预应力轻骨料混凝土收缩徐变引起应力损失的计算方法
短句来源
     Some Problems in the Theory of Creep in Concrete
     关于混凝土徐变理论的几个问题
短句来源
     DIFFERENTIAL SHRINKAGE AND CREEP STRESSES IN PRESTRESSED CONCRETE COMPOSITE BEAMS
     预应力混凝土迭合梁收缩徐变微差应力
短句来源
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  蠕动
     Superconductivity and Flux Creep in Weak Links of Sintered Tl_2 Ba_2 Ca_2 Cu_3 O_y
     烧结Tl_2Ba_2Ca_2Cu_3O_y的弱连接超导电性及其磁通蠕动
短句来源
     FLUX CREEP IN HIGH T_c YBa_2Cu_3O_y BULK SUPERCONDUCTOR
     高T_c氧化物YBa_2Cu_3O_y超导体中的磁通蠕动
短句来源
     FLUX CREEP AND PINNING IN Ag-DOPED HIGH-T_c SUPERCONDUCTOR YBa_2Cu_3O_(6+x)
     银掺杂YBa_2Cu_3O_(6+x)高T_c超导体的磁通蠕动和钉扎
短句来源
     STUDIES OF FLUX CREEP IN Y_(0.9)Eu_(0.1)Ba_2Cu_3O_(7-δ)
     Y_(0.9)Eu_(0.1)Ba_2Cu_3O_(7-δ)中的磁通蠕动研究
短句来源
     Flux Pinning and Creep for HgBa 2Ca 2Cu 3O y Superconductor
     HgBa2Ca2Cu3Oy超导体的磁通钉扎和蠕动
短句来源
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  蠕滑
     A Study on Wheel/rail Creep Theory by Using Finite Element Method
     基于有限元法的轮轨蠕滑理论研究
短句来源
     Creep traits analysis of wheel-rail contact about independently rotating wheels
     独立旋转车轮轮轨接触蠕滑特性分析
短句来源
     Compression deformation zone in the posterior border of slope is resulted from gravity creep action to Changjiang River along its bottom interface (separation plane of bed between T_1j3 and T_2b1 ), and there is no “Badong fracture”.
     斜坡后缘边界的挤压变形带是斜坡整体沿其底界面(T1j3—T2b1)之间岩层界面向长江发生重力蠕滑作用的结果,不存在“巴东断裂”问题。
短句来源
     By applying HERTZ's contact theory of the elastic bodies to the special conditions of wheel/rail contact, this paper has proved that the parameters of wheel/rail contact ellipse and non-dimensional creep coefficients can be determined directly from parameter ρ/r, thus making such problem much simpler in calculation and easy for practical application.
     本文根据赫兹的弹性体接触理论,针对轮轨接触这一特定情况,证明可由参数ρ/r直接确定轮轨接触椭圆的各个参数及无量纲的蠕滑系数,使计算得到大大简化,便于实际应用。
短句来源
     Influence of Locomotive Axle Load and Wheel Diameter on Behaviour of Adhesion and Creep Between Wheel/Rail
     机车轴重、轮径对轮轨粘着-蠕滑特性的影响
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  creep
Creep-resistant magnesium alloy design, plastic processing of magnesium alloys and rapid solidification processing of magnesium alloys have become the hot topics in magnesium technology.
      
Experimental research on the creep behavior and bearing capacity of repeatedly prestressed concrete beam
      
Furthermore, a kind of computational formula to calculate creep strain and deformation due to repeated prestressing in terms of time t was derived in this paper and the bearing capacity of this new structure has been tested.
      
The measurements were performed with the aid of a dynamic rheology in different regimes including determination of frequency dependences of rheological parameters, creep, and critical strain and stress at which the gelled systems are destroyed.
      
Phenomenon of delayed reversible deformation (inverse creep) of solids in surface-active media.
      
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Creep under very small torsional stress has been investigated for 99.95% polycrystalline iron in the temperature range of 350°-525℃. The general features of the creep curves obtained are essentially the same as those previously reported for 99.991% aluminum. The creep is shown to be consisted of two parts, one occurring at lower temperatures or shorter times and the other at higher temperatures or longer times. The first part of the creep is limited in extent and is associated with the viscous...

Creep under very small torsional stress has been investigated for 99.95% polycrystalline iron in the temperature range of 350°-525℃. The general features of the creep curves obtained are essentially the same as those previously reported for 99.991% aluminum. The creep is shown to be consisted of two parts, one occurring at lower temperatures or shorter times and the other at higher temperatures or longer times. The first part of the creep is limited in extent and is associated with the viscous behavior of grain boundaries. The activation energy for this grain-boundary creep is 78,000 ± 4,000 calories per mole according to the present creep and stress relaxation measurements. This value is close to the activation energy for self-diffusion of iron, a correlation which indicates that, in so far as to the mechanism of atomic migration is concerned, grain boundaries may not be very different from the interior of the grains.

用99.95%的多晶纯铁作了从350°-525℃的扭转微蠕变及应力弛豫试验,所得结果的概貌与以前用多晶纯铝所得的基本上相同。从蠕变曲线上可以看出这蠕变是由两部分组成的:第一部分是在较低温度或较短时间内发生的,第二部分是在较高温度或较长时间内发生的。第一部分的蠕变是有限的,是由于晶粒间界的粘滞性滑移所引起。根据微蠕变及应力弛豫测量的结果,这一部分蠕变所包含的激活能是78,000±4,000卡/克分子。这个激活能(晶粒间界滑移激活能)的数值与纯铁自扩散的激活能很相近,表示晶粒间界与晶粒内部对于原子迁移的基本过程而言并没有显著的差异。 加碳于纯铁中对于这两部分的蠕变都有显著的影响。最值得注意的结果是含碳量少到0.0004%时已经使晶粒间界的粘滞性滑移受到显著的阻碍。这些发现在控制金属高温蠕变的问题上指出一个一般性的原则,对于以前所提出来的晶粒间界空穴模型也提供了一些新的实验证据。 根据加碳的实验结果,对于第二部分高温蠕变的机构也提出了一个初步的看法,这蠕变所包括的基本过程可能是晶粒内部的空穴中的原子重新排列。

In the Construction of large concrete dams, a considerable amount of heat is generated when concrete sets. This heat induces serious thermal stress in the concrete blocks. In the usual engineering practice, the period between successive pouring of concrete is prolonged to allow the transference of heat into the atmosphere. For large dams, this is in conflict with the rapidity, of construction. In order to resolve this difficulty effectively, we have to find means to calculate the thermal stress.The calculation...

In the Construction of large concrete dams, a considerable amount of heat is generated when concrete sets. This heat induces serious thermal stress in the concrete blocks. In the usual engineering practice, the period between successive pouring of concrete is prolonged to allow the transference of heat into the atmosphere. For large dams, this is in conflict with the rapidity, of construction. In order to resolve this difficulty effectively, we have to find means to calculate the thermal stress.The calculation of thermal stress involves calculating the field of temperature distribution, field of elastic stress and creep stress. Being considered as a plane problem, the temperature T(x,y,t) satisfies the following equations (refer to fig. denotes derivatives along the outward normal.a, λ, α are constants.θ(t)is the temperature rise of concrete under adiabetic condition. The stress induced by the fields of temperature distribution and gravity has a stress function Ψp(x,y,t) satisfying the following equation:Δ2Ψ = Eldl/1v2ΔT = 0 in region Gl (1=0,1) The boundary conditions are :along CBAA'B'C' normal stress and shearing stress being zero.along CDD'C' displacement being zero.on surface L0, normal stress σy, shearing stress τxy and displacements u,v satisfy continuity conditionThis paper gives a preliminary treatment to the calculation of the two problems stated above. Several theoretical questions involved in the calculation will be further investigated in the near future.

在混凝土大坝的浇筑过程中,混疑土硬化时所放出的大量热量,会在浇筑块内引起严重的温度应力。为了降低坝内的温度应力,一般工程中采取了降低施工速度的办法,使坝内热量有机会向大气发散,但在大坝工程中,它却与施工速度产生了巨大矛盾,要有效地解决这一矛盾必须首先解决温度应力的计算问题。 温度应力的计算包括了温度(?)、时弹性应力(?)及徐变应力的计算。作为平面问题处理,温度T(x,y,t)满足 其中;表外法向微商α、λ、α皆为常数,θ(t)为混凝土在绝热状态下的上升温度。 由温度应力场和重力场的作用所产生的应力,其应力函数ψ(x,y,t)满足 Δ~2ψ+E_lα_l/(1-v_l~2)ΔT=0 在G_l内(l=0,1)边界条件为: 沿CBAA′B′C′,正应力及剪应力为零; 沿CDD′C′,变位为零: 在接触面L_o上,正应力σ_y,剪应力τ_(xy),位移u、v满足连续条件。 本文仅就以上二问题的计算作了初步研究,计算中所牵涉到的一些理论问题,尚待今后进一步研究。

Over 200 Cr-Mn-C-N experimental steels have been systematically studied bya combination of microscopic examination,X-ray diffraction,electrolytic extraction,chemical analysis,hardness and magnetic measurements,density and dilatometricmethods,oxidation test,tensile tests at both room-and elevated-temperatures,creep-rupture test,etc.,and the main findings are presented as follow:(1)Stable austenitic region.(2)Solid state reactions:martensitic transformation,precipitation reactions,and formation of sigma...

Over 200 Cr-Mn-C-N experimental steels have been systematically studied bya combination of microscopic examination,X-ray diffraction,electrolytic extraction,chemical analysis,hardness and magnetic measurements,density and dilatometricmethods,oxidation test,tensile tests at both room-and elevated-temperatures,creep-rupture test,etc.,and the main findings are presented as follow:(1)Stable austenitic region.(2)Solid state reactions:martensitic transformation,precipitation reactions,and formation of sigma phase.(3)Room-and elevated-temperatures properties,and their relation to the che-mical composition of the steels.(4)Strengthening effect of interstitial solid solution.(5)Effect of precipitation reaction on elevated-temperature strength.(6)Effect of V,W,Mo,Nb,B and Si.(7)Tentative recommendation for indus rial applications.

本文综合报导了作者对二百余种Cr-Mn-C-N实验钢所进行的有系统研究的主要结果:(1)稳定奥氏体区域.(2)重要相变——马氏体转变、σ相形成及沉淀作用.(3)室温及高温性能及其与钢中化学成分的关系.(4)间隙固溶体强化原理.(5)沉淀作用与高温强度的关系.(6)加入V,W,Mo,Nb,Si及B诸元素的影响.(7)工业上可试用的领域.

 
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