Development of Realtime Frasta technique for the Analysis of Fracture Mechanics

通过引入超精密位置控制工作台、控制计算机和图像处理系统，开发了一种新的实时FRASTA分析系统。利用研制的位置控制台，可以获得大范围扫描电子显微镜区域的图像。对于上、下裂纹面，我们进行了三种方式的研究，以阐明断裂力学。首先，重现压裂机理是主要目的。为了实现这一点，获得的精确图像被传输到名为机舱的虚拟现实系统中，并在其中重现骨折过程的技术是新开发的。因此，分析员有可能感觉到他好像穿过了裂缝表面。此外，在乔斯蒂斯的帮助下，分析人员更容易理解断裂力学的详细结构。其次，我们开发了新的技术来阐明断口表面的详细三维结构。结果表明，立体匹配法和二次信号积分法相结合，结合了两种方法的优点，可以更精确地进行TAR分析。利用VRML语言开发了三维图像的可视化表达，便于网上观察。第三，开发了断口表面表征的新技术。结果表明，利用分形分析可以区分晶界断口和晶间断口。在此基础上，应用小波函数，提出了利用血块碱基识别条纹区域m点的方法。由于该方法可用于纹区面积比的定量分析，因此可望推广应用于外加应力的估算。

New realtime FRASTA analysis system was developed by introducing the super-precise position controlled stage, controlling computer and image processing system. Using developed position controlled stage, image for wide range of SEM region can be obtained. For the pair of upper and lower Iracture surface, we made three way of investigation to clarify the fracture mechanics. Firstly, reproducing of fracturing mechanism is the primary purpose. To realize this, the obtained precise image are transferred to the virtual reality system called CABIN and the technique to reproduce the fracture process in it was newly developed. Thus, it became possible for the analyst to feel as if he walks through the fracture surface. Besides, the assistance by joystics makes the analyst far easier to understand the detailed structure of the fracture mechanics. Secondly, we developed new technique to clarify the detailed three dimensional structure of fracture surfaces. We showed that combination of the stereo-matching method with secondary signal integration method enables us the tar more precise analysis, using the advantages of both method. We also developed the visual expression of the three dimensional image to facilitate the observation on internet using VRML language, Thirdly, the new technique for the characterization of fracture surface was developed. It was shown that the discrimination between grain boundary fracture and inter-granular one becomes possible using fractal analysis. Next the technique to identify the striated region m dot by clot bases was developed by applying Wavelet function. Since this method can be applied for the quantitative analysis of area ratio of striated region, it is expected that this technique is extended to the estimation of the applied stress.