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damage to
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  损伤对
    The research content includes:(1) Research on the influence of the local damage to the dynamic characteristic of the plate structure.
    (1) 板类结构的局部损伤对动力特性影响的研究。
短句来源
    Based on the continuous vibration equilibrium equation, the pulse function is used to present the material property, the influence of the local damage to the inherent frequency and the mode is deduced, especially the amendments function is advanced.
    从板结构的连续振动方程出发,引入脉冲函数表征结构的材料特性参数,推导了结构的局部损伤对结构的固有频率以及振型的影响,并得到含局部损伤结构的低阶振型的修正函数。
短句来源
    From the numerical results of a typical example,it can be seen that the dynamic stress intensity factor decreases with the damage factor increasing,showing the shielding effect of the damage to crack propagation under small-scale damage.
    动态应力强度因子的计算结果显示,在小范围损伤的情况下,随着损伤的增加,动态应力强度因子的幅值降低,反映了小范围损伤时损伤对裂纹扩展的屏蔽作用.
短句来源
  “damage to”译为未确定词的双语例句
    Eualuation of Damage to building Using Model Parameters
    用模态参数估计剪切型建筑的损伤
短句来源
    INFLUENCE OF STRUCTURAL DAMAGE TO MODES AND DAMAGE DETECTION
    结构损伤对固有模态的影响及诊断
短句来源
    It is usually not the initial explosion but the secondary damage to pipelines and container system by flying missiles that results in the escape of flammable or even explosive fluids that leads to disastrous results.
    然而,大部分管道是在内充高压介质流体的状态下工作的,考虑内充流体介质及其压力与管道受侧向冲击破坏的耦合作用要比仅研究内空无压管道的响应更富有工程实际意义。
短句来源
    The thesis narrates many kinds of current methods of prediction forearthquake damage to structures and development situation of research ontime-dependent quality, analyses merits and demerits of every method, points outimportance and characteristic of the thesis.
    评述了目前各种建筑物震害预测方法和结构时变研究发展状况,分析了各种方法的优缺点,指出了本文工作的重点和特点。
短句来源
    According to the principle of rigidity equivalent to the composite materials columns specimen must simplify the process of impact damage to the one-dimensional equivalent uniform columns collisions, applicated one-dimensional stress wave propagation theory to describe the destruction process of composite materials columns specimen.
    根据刚度等效原则,将复合材料圆柱试样的轴向冲击破坏过程简化为等效均质圆柱的一维碰撞问题,应用一维应力波传播的理论描述了复合材料圆柱试样受轴向冲击的破坏过程,推倒了在冲击过程中材料吸收的冲击动能。
短句来源
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  damage to
There appear many Internet-scale worm incidents in recent years, which have caused severe damage to the society.
      
Chinese pine caterpillar (Dendrolimus tabulaeformis) larvae were fed with pine needles of different degrees of damage to evaluate the effects of pine needles on the growth and development of larvae.
      
The computed results show that the landing damage to the fighter and transport airplanes is 75% and 60% of the total damage, and the damage caused by the landing stroke is 40% of the landing-gear damage.
      
Pigments isolated from macromycetes and applied at a much lower concentration than those obtained from micromycetes prevented damage to bacteriophage-λ DNA induced by products of peroxidase-mediated degradation of aminobiphenyls.
      
At a low level of organic substrate, even strong colonization with microorganisms does not inevitably result in significant damage to metals.
      
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The slot of gate is a necessary element of the hydraulic structures. Because of its complex shape and high velocities of flow, the water strongly mixes and vortexes mill form so that low pressures are occured near the slot. The cavitation nuclei in the water may grow under the low pressures and then collapse to damage the wall. Since the effect of mechanical forces can be considered as the main cause of cavltation damages to the kinds of chemical inert materials such as concret, it is necessary to...

The slot of gate is a necessary element of the hydraulic structures. Because of its complex shape and high velocities of flow, the water strongly mixes and vortexes mill form so that low pressures are occured near the slot. The cavitation nuclei in the water may grow under the low pressures and then collapse to damage the wall. Since the effect of mechanical forces can be considered as the main cause of cavltation damages to the kinds of chemical inert materials such as concret, it is necessary to study the movement and growth of cavitation nuclei near the point of the minimum pressure. For that, the flow field must be given. For streamlined bodies or boies having slight boundaty changes, their flow fields can be solved by the theory of perfect fluid or viscous fluid; but for bodies having great boundary changes such as the slots, their flow fields are complicated and their boundary layers may be separated at some places of the boundaries so that the flow fields cannot be decided by the above two kinds of theory. Only can the theory of turbulent fluid give precisely the results of flow fields. Recent years there have been many articles about calculations of mean turbulent flow fields, but few reported about calculations of mean pressure fields. In this paper, the finite analytic method and k-e turbulent model are employed to solve Reynolds equations. In two cases of Reynolds number being 104 and 2×104, the turbulent flow fields past the two-dimensional slot of gate are calculated by the vorticity-stream function method and the results are given for distributions of stream function, velocity, vorticity, turbulent kinetic energy, turbulent dissipation rate and turbulent viscosity on the basis of which the mean pressure coefficients are determined.In practice, the water flow near the slot of gate is three-dimensional, but as the first step of investigations the hypothesis of two-dimensional flow in the slot is made; furthermore, nonuniform grids are used in the calculation for fitting the boundaries and improving the results. Considering the wall effects, the wall functions are used so that the computational grids can be designed apart from the walls to diminish the influences of large gradients of the velocities near the walls and save the storage of the computer.From the computations of the problem, the effect of using k-e turbulent model to close the Reynolds equations is stated to be good and the finite analytic method is proved to be stable and convergent for the calculations of the turbulent flow fields of concaves. The calculated results of the mean flow fields are agreed well with the experimental data and the results of the mean pressure fields demonstrate mainly the characteristic of the pressure in the domain of the slot. But there exist some differences of pressure coefficients in the front of the slot, further improvements will be needed for obtaining better results of pressures. In the whole, the computational results are reasonal and satisfactory.In order to obtain real turbulent flow fields in the slot of gate, much more work will be needed such as the determination of three-dimensional wall functions, the invention of high efficient computational techniques and etc. These are now in progress.

本文采用有限分析法,k-ε紊流模型求解雷诺方程,计算了雷诺数为10~4及2×10~4两种情况下平面闸槽区的平均紊流场,给出了流函数、速度、涡量、紊流动能、紊流粘性系数以及压强的分布,为预测闸槽区的初生空化数提供了依据。

The relationship between macroscopic damage and microscopic damage for concrete was constructed based on the proposed equivalence principle of energy dissipation. The ratio of axial damage to transverse damage is 0.1. According to the proposed relationship, the evolution of microscopic variables can be reflected through macroscopic variables, and can be measured easily. Conversely, there is a physical background on the evolution of macroscopic variables.

提出了能量耗散等效原理,建立了混凝土材料宏观损伤与细观损伤的关系;单轴压缩下,纵向损伤与横向损伤之比为0.1;根据建立的宏观损伤与细观损伤的关系,细观量的演化就可以通过宏观量来反映,易于测量;反之,宏观量的演化又有了细观物理背景

All the structural analysis now available are based on the assumption that the structures are in good condition But damages to structures can not be avoided in initial condition or in employment, and the damages will cumulate and become serious in the employment Damages not only shorten the life of structures, but also reduce their mechanical properties This paper lays its emphasis on the strength and stiffness reduction of member in which cracks exist The strengh reduction of metal...

All the structural analysis now available are based on the assumption that the structures are in good condition But damages to structures can not be avoided in initial condition or in employment, and the damages will cumulate and become serious in the employment Damages not only shorten the life of structures, but also reduce their mechanical properties This paper lays its emphasis on the strength and stiffness reduction of member in which cracks exist The strengh reduction of metal member under plane stess、 plane strain and elastic-plastic condition are analyzed, and the formulas of member residual strength are obtained The stiffness of members existing cracks are deduced based on the energy release principle Analysis for a tri member structure is conducted using the method presented in this paper, and the analysis results reveal that the reduction of member strength and stiffness due to craks has a remarkable influence on ultimate strength and reliability of structures

现有的结构力学分析都假设结构为完好无损,然而结构在初始状态或使用过程中总存在各种损伤,而且损伤在使用过程中会不断积累和加剧。损伤不但缩短结构的使用寿命,而且引起结构力学性能下降。本文着重研究了具有宏观裂纹构件的强度和刚度随损伤发展的衰减规律;分析了平面应力、平面应变及弹塑性情况下带裂纹构件的强度衰减,提出了构件剩余抗力的计算方法;基于能量原理,推导了带裂纹构件的刚度;应用本文的方法分析了一个三杆结构,分析结果显示了裂纹引起的构件强度和刚度的变化对结构承载力和可靠度的显著影响。

 
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