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Based on genetic neural network and modal strain energy, a two-stage method for detecting diagonal crack s is proposed to identify the location, angle and depth of diagonal crack s in beams.

基于遗传神经网络与模态应变能，提出了一种斜裂缝两阶段诊断方法，识别梁体中斜裂缝的位置、角度和深度。

Meanwhile, based on equivalent amplitude loading crack spreading equation, we present time cycle algorithm for prediction of fatigue crack growth life.

同时以等幅载荷裂纹扩展公式为基础，提出了一种疲劳裂纹扩展寿命估算的时间循环计算方法。

Scale, homogeneousness, direction of crack, length of a single crackand density of crack have influence on strength of specimens.

1试件尺度、均质度、裂纹方向、单一裂纹长度、裂纹密度对试件强度都有影响。

The crack can be diagnosed based on the characteristics of the input power flow of circular plate structures with the peripheral surface crack.

在高频情况下，研究了圆板在中心受集中载荷作用下的弯曲波运动以及输入的振动功率流，分析了振动功率流与破损位置及其特征尺寸的关系，从而可进行有效的破损诊断。

Based on the fracture mechanics approach, the finite element method analyzed a varity of the stress intensity factor at the pavement crack tip when setting fiberglass-polyester paving mat, and the effect of the stress intensity factor in symmetric load and asymmetric load was studied when the asphalt layer modulus, thickness of semi-rigid base, the the depth of the crack, touch condition, interlay modular, etc., changed.

基于断裂力学的方法，采用ANASYS软件模拟沥青路面典型结构，分析了设置聚酯玻纤布夹层后，在正载和偏载作用下，裂缝尖端应力强度因子的变化，研究了沥青层模量、基层厚度及裂缝扩展深度等结构参量及层间接触条件和夹层模量对应力强度因子的影响规律分析结果表明，设置聚酯玻纤布夹层，可以有效防治荷载型反射裂缝的扩展。

Study on a Expert System for Analysis of Casting Defect;2. The effect of casting defect such as microporosity and the inclusions in the process of crack initiation,crack propagation and fracture was analyzed.

系统研究了L114A合金疲劳损伤特征，分析疏松、夹杂物等铸造缺陷在疲劳裂纹的形核、裂纹的扩展以及瞬断中所起的作用，表明铸造过程中形成的铸造缺陷数量、尺寸、位置对金属的疲劳性能都有不同程度的影响。

The stress intensity factors of pipes containing an elliptical arc of crack have been evaluated by collapsed singular element with the more detailed mesh on crack front and their respective adjacent areas.

中文摘要本论文对含内、外裂椭圆形裂缝之圆管应力强度因子计算，计算在椭圆形裂缝尖端部位附近，使用溃点奇异元素，建立有限元素的网格化自动产生模型，并利用ANSYS程式计算裂缝尖端的应力强度因子。

On the basis of this, from the view of material selection, mixture grade, cement dose, the usage of additive and maintenance management, some measures are put forward for preventing cement-stabilized subbase from shrinking cracking, and the targets of reducing the crack odds of subbase and the crack widths, or staying subbase from cracking are obtained.

在此基础上，从材料选择、混合料级配、水泥剂量、外加剂的使用、养护管理等角度提出水泥稳定粒料基层收缩裂缝防治措施，达到减少基层收缩开裂几率、减少裂缝宽度或延缓基层开裂的目的。

By adopting its complex variable solutions, the stress solutions of dislocation in bi-material on the whole plane were worked out, integration of which along the crack line would lead to the basic stress solutions in Cartesian and polar coordinates system of an bi-material incline crack.

应用两相材料中点位错在全平面的复势函数解，导出了两相材料中点位错在全平面的应力场解，进而将该解沿裂纹线积分得到倾斜裂纹的直角坐标及极坐标应力场基本解，同时利用该基本解退化出单根界面裂纹的直角坐标及极坐标应力场基本解。

Another is the constant temperature gradient on the crack surface, which includes the insulated and uninsulated crack cases.

研究了含中心裂纹的正交各向异性板，在远场均匀热流作用下温度场的分布。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。