裂纹

By means of the complex variable function method and introducing the conformal transformation,the anti-plane shear problem about two semi-infinite collinear cracks in one-dimensional hexagonal quasicrystals was investigated and the exact solution to mode Ⅲ SIFs was found out.

利用复变方法，通过引入适当的保角映射，研究了一维六方准晶狭长体中双半无限共线裂纹的反平面剪切问题，给出了Ⅲ型裂纹问题的应力强度因子的精确解。

When the stress and displacement fields in a specimen are calculated by finite element method, the stress intensity factors K and K of mixed-mode crack can be obtained immediately by a contour integral.

此方法与积分路径的选择无关，用有限元法计算出远离裂纹尖端的位移场和应力场，就可通过计算绕裂端的围线积分，精确地给出混合型裂纹的应力强度因子KⅠ和KⅡ的数值解。

In this paper,the boundary singular kernel method in Reproducing Kernel Paicle Method has been applied to impose the essential boundary conditions in EFGM by revising the MLS shape function.The stress field and the displacement field are analysed by linear elastic theory.The contour integral method is used to calculate the J-integral,then the stress intensity factors of mixed-mode crack is acquired.The correctness and the validity of the method are validated.

本文将再生核质点方法中的边界奇异权方法引入EFGM中，通过对MLS形函数进行修正实现了本质边界条件在节点处的精确施加；运用线弹性断裂理论分析裂纹板的应力应变场，采用围线积分法计算J积分，给出了复合型裂纹板的应力强度因子的无网格伽辽金方法。

On the basis of Muskhelishvili's complex function theory, an auxiliary field of mixedmode crack was accomplished, and then using Betti's reciprocal work theorem, a path independent contour integral method for stress intensity factors of mixed-mode crack was obtained.

本文用复变函数理论推导出裂纹的辅助场，并用Betti功互等定理给出求解混合型裂纹应力强度因子的远场围绕积分法。

Critical load and relevant crack length and displacement data from these experiments were used in a finite element model to calculate the crack tip mode angles, and corresponding critical energy release rate.

以试验测得的临界载荷及对应位移、裂纹扩展长度为条件，建立与测试装置对应的有限元模型，计算裂纹尖端模式角及在此模式角下的临界能量释放率。

At the same time, the correlations among the AE count rate, energy rate, crack growth rate and SIF are obtained as well.

同时，得到了表征材料疲劳裂纹扩展的AE计数率、能量变化率、裂纹扩展率以及应力强度因子之间的相互关系。

Of crackle shut condition to be decided by the stress of crackle face.

裂纹的开闭状态由裂纹面的应力决定。

Having the surface decorated with a network of fine cracks, as in crackleware.

表面布满了细裂纹构成的装饰，比如有裂纹花饰的陶瓷。

Oxidized round spots in casting blank cracks in a heater by simulator experiment were crassitude.

铸坯裂纹加热炉过程模拟发现其裂纹附近产生粗大的氧化圆点。

Material removal rates can be obtained by the proper application of this phenomenon. The stresses of crosshatch intersection point for ceramics is analyzed by using the finite element method.

珩磨加工中，相邻磨粒间陶瓷材料磨削裂纹存在着相互扩展和交叉，磨削残余应力控制磨削裂纹之间的相互影响作用。

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。