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裂纹前沿
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  crack front
     Study on Fatigue Crack Front Straightness in CTOD Weld Specimen of Metallic Thick Plank
     金属焊缝CTOD试样疲劳裂纹前沿平直度研究
短句来源
     The exponent λ is a function of mode of cracking (i.e. mode I, II or III), the inclination angle β of the crack front at the free surface, the inclination angle γ of the crack plane with the solid surface and the Poisson's ratio of the solid.
     其中指数λ是关于破裂模式 (即模式I、II或III) ,裂纹前沿在自由面的倾角 β ,破裂面与固体表面的夹角γ以及材料泊松比的函数 .
短句来源
     The size and shape of the crack front were updated using the result of finite element program, and then the crack propagation was simulated by moving the node.
     利用有限元计算的结果来自动更新裂纹前沿的尺寸和几何形状,并使用节点移动法来模拟裂纹的扩展过程。
短句来源
     (2) The stress intensity factors(SIFs) in the crack front decreases with the increase of the distance from the upper free surface regardless of the cracked body type(infinite or finite).
     (2)不管裂纹体为无限大或有限大,半球形表面缺陷影响下表面裂纹裂纹前沿的应力强度因子均随着裂尖与前自由表面间距离的增大而减小。 (3)无限大裂纹体中,裂纹前沿最大的应力强度因子是R/r的函数, r为半球形表面缺陷的半径。
短句来源
     3. Using the above method, mode-I and mixed-mode crack problems of typical cracks are numerically calculated and the electroelastic intensity factors near the crack front are given, accuracy of results are found to be very high;
     3.应用上述方法,对典型裂纹问题的Ⅰ型断裂问题和混合型断裂问题进行了数值计算,得到了裂纹前沿的电位移、应力强度因子的数值结果。
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  “裂纹前沿”译为未确定词的双语例句
     Stress intensity factors(SIFs) of cracks having different length which angle β is equal to 45°, 60° and 75° respectively, are calculated by using finite element method(FEM).
     利用有限元方法计算了不同长度贯穿斜裂纹前沿应力强度因子,分别计算了β为45°、60°和75°三种情况,得到裂纹前沿应力强度因子的分布规律,以及应力强度因子随着角度的变化规律。
短句来源
     The reasons for improving the fatigue properties of 1Cr18Ni9Ti steel caused by vacuum and low temperature were attributed to the cleaning-up effect of vacuum on crack surfaces and the formation of lath martensite induced by low temperature.
     真空与低温显著提高 1Cr18Ni9Ti钢疲劳性能的原因与真空对裂纹表面的净化效应 ,以及低温促进疲劳裂纹前沿形成板条马氏体有关
短句来源
     The complex stress intensity factor and the strain energy density in the tip of interface cracks are calculated for these two kinds of specimens respectively.
     分析了理想界面裂纹尖端的复应力强度因子以及非理想界面裂纹前沿的应变能密度与试件的几何尺寸、双材料的性质等的关系。
短句来源
     Simulation of Stress Distribution and Precipitate Influence at the Crack Tip of CT Sample in Superalloy
     高温合金CT试样裂纹前沿应力分布及第二相影响的模拟计算
短句来源
     Using frozen stress photo-elastic method, experimental studies were made of the Stress Intensity Magnification Factor(M_s)for internal surface crack in pressurised thin spherical shells with ratios of wall thickness to inner diameter W/R_i=0. 10, 0. 078, 0. 067. The variation of M_s with shape a/c anddepth a/W along the crack periphery was obtained.
     用光弹性法对壁率为W/R_1=0.100,0.078,0.067的球形容器内表面裂纹进行了较大量的实验研究; 得到了应力强度修正因子M_沿裂纹前沿及随裂纹深度a/W,形状a/c和壁率W/R_1的变化规律;
短句来源
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  相似匹配句对
     Progress in Science
     科学前沿
短句来源
     FRONTIER IN SCIENCE
     科学的前沿
短句来源
     Study on Fatigue Crack Front Straightness in CTOD Weld Specimen of Metallic Thick Plank
     金属焊缝CTOD试样疲劳裂纹前沿平直度研究
短句来源
     Boundary Element Modeling of Stress Singularity at the Front of a Semi-circular Surface Crack
     半圆形表面裂纹前沿应力奇异性的边界元模拟
短句来源
     The Inner Crack in Malleable Cast Iron
     可锻铸铁的内裂纹
短句来源
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  crack front
We propose an analytic expression for the exponent and confirm this for different models (crack front propagation, Edwards-Wilkinson model in a quenched noise etc.).
      
The results of the displacement discontinuities of the crack surface and the stress intensity factors at the crack front are in good agrement with the theoretical solutions.
      
Moreover, the singular nature of temperature gradient field near the crack front is proved by the main-part analysis method of the singular integral equation, and the singular temperature gradients are exactly obtained.
      
Variation of the stress intensity factor along the crack front of interacting semi-elliptical surface cracks
      
The results show that the present method yields smooth variations of stress intensity factors along the crack front very accurately, for various geometrical conditions.
      
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The paper analyses the macrofractography morphology of metal fatigue and bri-ttleness. It Shows that the space of the beach marks on fatigue sarface, the change of bended direction and the slant of the beach marks , the shape of the beach marks at the circumambdient stress concentration and fatigue steps at the different conditions can be described by using a simple equation. The shapes of the brittle rapid radiactive curves are calculated,analysed, compared and discussed with two different models (the vertical...

The paper analyses the macrofractography morphology of metal fatigue and bri-ttleness. It Shows that the space of the beach marks on fatigue sarface, the change of bended direction and the slant of the beach marks , the shape of the beach marks at the circumambdient stress concentration and fatigue steps at the different conditions can be described by using a simple equation. The shapes of the brittle rapid radiactive curves are calculated,analysed, compared and discussed with two different models (the vertical lines of the including curves of the twinkling leading edges of cracks and the traces cruves of the intersection of the growth of nuclei) and with two different growing methods of the nuclei (equal speed and equal power).

本文对金属疲劳和脆性宏观断口形态进行了数学分析。分析表明,宏观疲劳弧线的间隔、弯曲方向的改变、偏转、周应力集中时对轴的疲劳弧线的形状及各种情况下的疲劳沟线(台阶),均可用一简单的数学方程式来描述;本文用两种不同的模型(瞬时裂纹前沿线的包络线的垂线和依次生核的裂纹扩展交点的轨迹线)及两种不同的裂纹核心的扩展方式(等功的和等速的)形成的宏观脆性放射线条——即人字纹——进行了数学分析、比较和讨论。

The paper contains experimental results of propagation rate distribution of a toecrack along its front under fatigue load.Experiments were performed on aluminumalloy(LY-12R)specimens simulating geometrical shape of a T-joint with toe crack.To obtain the crack propagation rate,markings were induced on fracture surface withchanges in amplitude at specified numbers of fatigue load cycles.After completefracture of the specimen,propagation rates were calculated by measuring the distancebetween markings on the fracture...

The paper contains experimental results of propagation rate distribution of a toecrack along its front under fatigue load.Experiments were performed on aluminumalloy(LY-12R)specimens simulating geometrical shape of a T-joint with toe crack.To obtain the crack propagation rate,markings were induced on fracture surface withchanges in amplitude at specified numbers of fatigue load cycles.After completefracture of the specimen,propagation rates were calculated by measuring the distancebetween markings on the fracture surface.It is shown that(1)owing to the stress concentration at the toe,the propaga-tion rate of a toe crack in the direction of plate width is always higher than thatof a crack of the same size in a flat plate,irrespective of the crack depth;(2)additional moment,caused by angular welding distortion,increases the propagationrate of toe crack in the direction of plate width;(3)the stress intensity factorof a toe crack at the front near the surface is always higher than that of a crackof the same size in a flat plate under the same loading conditions;(4)compressiveresidual stress at the toe is effective in reducing the propagation rate of toe crack;(5)the length of a crack originated from a toe crack when its vertex reaches theback surface of the plate is much greater than the final length of a part-through crackof the seme size,originated from a flate plate,when the plate is penetrated throughunder the same loading conditions.This should be taken into full acconnt in designingpressure vessels on the p(?)inciple of“leak before break”.

本文的目的在于研究疲劳载荷下的焊趾裂纹扩展规律,并通过它来分析有限长度焊趾裂纹前沿的应力强度因子分布。试验采用LY—12R 铝合金制成几种焊趾裂纹的模拟试样。用疲劳勾线法求出前沿各点的裂纹扩展速率并与平板表面裂纹试样进行了对比.认为:中心加载焊趾裂纹在长度方向的扩展速率高于中心加载平板表面裂纹;偏心加载焊趾裂纹在长度方向的扩展速率高于中心加载扩展速率。随着相对偏心的提高,裂纹沿长度方向的扩展速率亦增加;表面残余压应力可以有效地抑制焊趾裂纹在长度方向的扩展速率.

In this paper, the stress distribution at the flaw front of a body containing a crack of Mode I is investigated. A "near field" solution has been obtained for stress intensity factor K_1 in the full field. The results thus obtained can be taken as the analytical foundation for the experimental determination of K_1 and provide an appropriate mechanical model for the approximate mumerieal analysis. Thus, by use of the method presented in this paper, the difficulties involved in solving K_1 on account of "tip blunt"...

In this paper, the stress distribution at the flaw front of a body containing a crack of Mode I is investigated. A "near field" solution has been obtained for stress intensity factor K_1 in the full field. The results thus obtained can be taken as the analytical foundation for the experimental determination of K_1 and provide an appropriate mechanical model for the approximate mumerieal analysis. Thus, by use of the method presented in this paper, the difficulties involved in solving K_1 on account of "tip blunt" and the singularity in the stress field at the crack tip can be overcome and besides, the resulting errors in the determination of stress intensity factors K_1 can also be analysed. As a result, precision and accuracy are ensured.

本文对Ⅰ型裂纹体裂纹前沿应力分布规律进行探讨,获得应力强度因子K_1的全场性“近场”解析。该分析可以为K_1的实验确定提供分析基础,为近似数值计算法提供力学模型。从而克服了因裂纹尖端“钝化”及其应力场奇异性所导致求解K_1的困难。且给出误差分析。致使结果的精度和可靠性得到保证。

 
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