裂纹

By the dynamic strain response test and its wavelet analysis of the driving axle housing models with and without prefabricated cracks respectively, the feasibility of the crack detection method which is based on the wavelet multiresolution analysis and the modern spectrum estimation is demonstrated.

通过对微型汽车驱动桥壳有、无预制裂纹模型试样在瞬态激励下的动态应变响应试验和小波分析，论证了采用小波多分辨分析和现代谱估计技术，通过对小波分解所得到的各尺度下细节信号的频谱分析，检测结构裂纹故障的可行性。

This paper reviews the applications of singular integral equation to the scattering problems of elastic waves by cracks, especially by interface cracks, which were made during past two decades.

结合20多年来国内外的研究成果，评述奇异积分方程在裂纹体弹性波散射问题中的应用，特别是在界面裂纹散射问题中的应用。

Singular integral equation ; crack ; interface crack ; elastic wave scattering ; fracture dynamics

奇异积分方程；裂纹；界面裂纹；弹性波散射；断裂动力学

Crack ; fault ; elastodynamics ; crack front wave ; limiting rapture speed ; self-heading slip pulse

裂纹；断层；弹性动力学；裂纹前缘波；极限断裂速度；自愈合滑错脉冲

To measure the fracture toughness and crack propagation parameters of Q235 steel by fatigue experiment from the point of energy, J integral and the other method are used in measuring.

2从能量的观点出发，通过结构疲劳实验和标准实验，分别用柔度法和J积分测量法测量了Q235钢的断裂韧性值，同时，测量了Q235钢与疲劳裂纹扩展速率相关的两个参数，为基于Q235钢的机械承载结构裂纹的珍断与控制打下了坚实的基础。

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。

The view that the process of cracks development is that of cracks evolution is proposed according to evolutionism, genetics and virology.

本文结合了进化生物学、遗传学和病毒学的有关理论成果，指出裂纹演化的过程也是裂纹发展的进化过程。

Crack propagation from the flameout edge can be modeled by considering an edge crack in the martensite surface from flame cutting.

裂纹从烧割边缘的扩展可模拟为一个从烧割处的马氏体表面起始的边裂纹。

By using ANSYS system, a non standard specimen which includes a small size circular crack (12μm to 1mm of diameter) is analyzed. The specimen vibrates at 20kHz and its fatigue life is in gigacycle range.

应用ANSYS软件系统对含微小圆形裂纹(直径为12μm到1mm)的非标准金属材料试件进行分析，得到了振动载荷(20KHz)下该试件裂纹尖端应力强度因子的规律。

This paper mainly uses the technologies and methods of digital image processing and computer grogram language to research and develop a glass-crack inspecting system. We can judge whether the image is a crack or not from the digital image processing methods that the inspecting system applies us.

本文主要利用数字图像处理技术及其方法结合计算机编程语言来研究一套检测玻璃瓶裂纹的系统，利用该检测系统提供的一些数字图像处理方法可以快速准确的判断出该图像是否为裂纹图像。

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。