1995 Fiscal Year Final Research Report Summary
Representation of Fracture Micro Surface of Metals using Virtural Reality
| Project/Area Number |
06555025
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| Research Category |
Grant-in-Aid for Developmental Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
Materials/Mechanics of materials
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| Research Institution | University of Tokyo |
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Principal Investigator |
SAKAI Shinsuke Faculty of Engineering, University of Tokyo Associate Professor, 大学院・工学系研究科, 助教授 (80134469)
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| Co-Investigator(Kenkyū-buntansha) |
OKAMURA Hiroyuki Faculty of Engineering, University of TOkyo Professor, 理工学部, 教授 (00010679)
TAKANO Tachio Faculty of Engineering, University of Tokyo Assistant, 大学院・工学系研究科, 助手 (10010852)
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| Project Period (FY) |
1994 – 1995
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| Keywords | Virtual Reality / Electron Microscope / Fractography / FRASTA / Image Processing / Strength of Materials |
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| Research Abstract |
Outline : in the fractographical analysis, the detailed fracture process that occurred inside the material can be understood well by using the technology called fracture-surface topography analysis (FRASTA). In this research, virtual reality technology is introduced into FRASTA,and its applicability is examined.
Development of System : The SEM topographical data are transfered to the graphic workstation and are analyzed using the technique of virtual reality. Furthermore, the virtual reality software aid to provide us with a quasi-experience within the micrograhpic space.
Algorithm : Two conjugate surfaces, are shown on the display simultaneously first. Then one of them is moved relatively to the other fixed surface. The surface is either moved in parallel or rotated. Relative distance between two surfaces is calculated and the contour map of the distance is drawn. By observing this contour map, we can acknowledg the degree of matching easily. If we are not satisfied with the result, we will return to the matching step. This iteration is repeated until the satisfactory result is obtained.
Examples : Apllying the developed method to the fracture surfaces of the fatigue under random loads, the following performaces are confirmed. 1.Observation of the fracture process by matching two conjugate surfaces. 2.Observation of the series of fractured area-projection plots. 3.Animation drawing of the fracture process.
Conclusion : It is shown that the developed graphic system using virtual reality enables us to get into the micro space and to manipulate virtual surfaces under arbitrary requirements. And thus it becomes easier to understand the microfracture process.
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