裂纹

During the course of using the digital image processing to research and analyze the glass-crack image, apply Microsoft Visual Basic 6.0 grogram language to develop this inspecting system and make the varied arithmetic some individual processing modules. From the open, read and storage of the image to the image segmentation, feature selection until the crack judgment, this system all utilize the modularization program method.

在利用数字图像处理技术研究和分析裂纹图像的过程中，应用了可视化编程语言Visual Basic6.0来开发该检测系统，将各种算法分别做成一个个单独的处理模块，从图像文件的读取、保存到图像预处理在到图像分割、特征提取直至裂纹判断都采用了模块化的编程方法，这样不仅便于算法的编程，还可以使操作界面清晰明了，便于对图像进行处理和操作，提高处理速度。

G. Lekhnitskii and the Hankel integral transformation are used, And thereby a solution of the Stress field and displacement field of an embedded penny-shaped crack lying in a transverely isotropic plane under the action of the uniform tension stress at the far end perpendicular to the crack surface is obtained.

本文利用对于横观各向同性体轴对称变形时应力函数解法的基本方程，并应用Hankel积分变换，求解了位于横观各向同性平面内的埋藏圆片裂纹在垂直于裂纹面远处均匀拉应力作用下的应力场和位移场，获得了与各向同性材料相同的应力强度因子，不同于各向同性材料的应力场和应变能释放率裂。

Plane strain, mode I quasi-static steady state crack growth is investigated utilizing the finite element method. It is once again established that TNT plasticity can significantly increase the stress level near the crack tip. The crack tip stress singularity is higher than or equal to the square-root singularity of elastic K field and is also independent of the plastic hardening exponent.

采用有限元方法研究了平面应变Ⅰ型准静态的稳态裂纹扩展，再次证实TNT非局部理论能够显著提高裂纹尖端附近的应力水平；裂尖应力场的奇异性超过或等于弹性K场平方根奇异性，而且与塑性硬化指数无关。

In conclusion, by consideration of viscosity effect of material at propagating crack-tip, it is established in the paper the unified continuous singular crack-tip field in linear-hardening material under the condition of incompressibility. The plastic shock is eliminated that exists in non-viscosity solutions. What's more, the dynamic and quasi-static solutions are united together when the Mach number approaches zero.

总之，通过考虑扩展裂纹尖端材料的粘性效应，本文建立了幂硬化材料在不可压缩条件下扩展裂纹尖端的统一的连续奇异性场，消除了无粘性解中存在的塑性激波，在马赫数趋于零时动态解和准静态解得到了统一。

Therefore, the expressions for the displacement and stress components in terms of four displacement potential functions give a general solution for the governing equations in 1D hexagonal QCs. As an application of the above theory, the problem of a circular crack embedded in an infinite 1D hexagonal QC of point group 6mm is considered.

作为应用进而考虑一个无限的，包含一个圆盘状裂纹的一维六方准晶，在裂纹的上下表面受到一均布力作用下，得到了整个准晶体的弹性场和应力强度因子的精确解。

Fracture experiments under biaxial loading and theoretical analysis are used to study the fracture behaviour of cruciform specimen of 16 MnR with a central penetrated ⅠⅡ mixed mode crack. A ⅠⅡ mixed mode crack J integral criterion is explored.

通过理论分析和双轴向断裂试验，对我国压力容器常用钢16MnR所制成的含中心穿透Ⅰ－Ⅱ复合型裂纹十字形试样的断裂规律进行了试验研究，探讨了Ⅰ－Ⅱ复合型裂纹J积分断裂准则。

The relationship between the G(superscript *) integral of release rate of non-spontaneous extending energy and stress-intensity factors was given. The relationships among G(superscript *) integral, load, geometry parameters and machine function parameters were provided. Furthermore, the stress intensity factor of center cracks in sectional I beam was obtained.

给出了工字型截面梁裂纹非自发扩展能量释放率G积分与应力强度因子的关系，同时也给出了G积分与载荷、几何参量以及机械性能参数的关系，进而得到工字型截面梁腹板中心裂纹的应力强度因子。

The general equation of crack opening displacement in transversely isotropic body is easy to be obtained by means of the method in this paper.

横观各向同性体中，埋藏裂纹方位任意时的裂纹张开位移方程，根据本文的方法易于得到。

Comparative Analysis of the CCKZ63 spring joists and joist of the traditional production process, and in accordance with the casting hot crack formation mechanism, CCKZ63 spring joists crack defects were analyzed.

对比分析了CCKZ63弹簧托梁与传统托梁的生产工艺，并根据铸件热裂纹的产生机理，对CCKZ63弹簧托梁裂纹缺陷进行了分析。

It can not interpret the fact why liquation crack s appear around the fusion line and are very short, but it may be satisfactorily explained by the high temperature strain distribution characteristic figure brought up by author.

传统观点尚不能解释液化裂纹出现于熔合线处和裂纹很短的现象，用作者给出的高温应变分布图可很好解释。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。