| 1. | There exists pronounced difference in the fatigue fracture at room temperature and 400
常温疲劳断口和高温疲劳断口有着较大差别。 |
| 2. | Fatigue experiment of the full - scaleequalizing bar of bulldozer andanalysis of the fatigue fracture
推土机平衡梁全尺寸疲劳试验及疲劳断口分析 |
| 3. | 4 . the research of metal fatigue fractal dimension measuring is in the study of material characteristic analyzing
金属疲劳断口分维数测量方法的研究是目前材料性能分析研究中的前沿课题。 |
| 4. | Sem investigation shows that all the crack initiations can be traced back to the lateral sides of the sample , and the crack propagates along the direction normal to the loading axis
Zr一4合金的低周疲劳断口上，所有裂纹都起源于试样最窄处的侧表面，并逐渐向内部扩展。 |
| 5. | Then uses the methods such as robert , sobel to detect the edge . finally , uses the method of fourier to extract the vein feature of the shell pattern so as to make computer identify the fatigue fracture
然后采用robert 、 sobel等算法进行边缘检测，最后采用fourier变换来提取贝壳纹花样的纹理特征值，实现计算机对疲劳断口的识别。 |
| 6. | This article introduces gray image processing technology . firstly , in order to eliminate noise , optimize image and get precise edge feature , a series of preparations can be done to fracture image such as histogram equalization , binarization , edge enhancement , and so on
本文采用灰度图像处理技术，首先对疲劳断口图像进行直方图均衡化、二值化、边缘增强等预处理来消除噪声，优化图像，以得到精确的边缘特征。 |
| 7. | According to the measuring result of fatigue fracture fractal dimension , it gets the relationship curve of ti alloy tc11 welded joint fracture fractal dimension with loading strain range , and the method of fatigue life forecasting fatherly . 3
根据疲劳断口分维数的测量结果，获得了tc11钛合金焊接接头断口分维数与其疲劳寿命的关系曲线，以及断口分维数与最大加载应变之间的关系曲线，给出了进一步疲劳寿命预测的方法。 |
| 8. | According to the model of structure fatigue damage fractal evolution , the relation between macro - damage variable , fractal damage variable and fatigue life can be found , and the fatigue damage evolution equation of ti alloy tc11 welded joint can be built , and the method of more forecast fatigue damage is given
根据结构疲劳损伤分形演化模型，通过对tc11钛合金焊接试件的疲劳试验和疲劳断口分维数测量，得到了宏观损伤变量和分形损伤变量与疲劳寿命的关系，建立了tc11钛合金焊接接头的疲劳损伤演化方程。给出了进一步疲劳损伤量预测的方法。 |
| 9. | The formation of 3 . 5 % nacl solution is almost similar to that of 3 . 5 % nacl thin electrolyte layer , just the mass transfer rate of the oxygen in the layer is more quicker than in the solution ? the test shows that the crack growth rate of wet - corrosion fatigue of lc4cs aluminum alloy in the layer is quicker than in the solution , and also shows that morphology of fatigue fracture in the layer is evidently distinguished from in the solution
3 . 5 nacl溶液和3 . 5 nacl薄液层的化学组成几乎完全相同，只是薄液层中氧的传质速率较快。实验结果显示了在薄液层中， lc4cs铝合金的湿腐蚀疲劳裂纹扩展速率，大于在3 . 5 nacl溶液中的速率。实验还发现其疲劳断口的形貌，也与3 . 5 nacl溶液中的有明显区别。 |
| 10. | The selections of electron microscope magnifying multiple and measuring size in fatigue fracture fractal measure are studied in this paper , and the improved treatment of secondary electron lines scanning fractal dimension , is applied successfully to the measuring of ti alloy welded joint fracture fractal dimension and the valuable selective range of fractal dimension measuring parameter is got , which is very important to further research
本文应用数据处理技术研究了疲劳断口分维数测量中电镜放大倍数及测量码尺的选择问题，改进了二次电子线扫描分维数处理方法，并成功地应用于钛合金焊接接头断口分维数的测量，得到了有价值的分维数测量参数的选择范围，对进一步的研究具有重要意义。 |
