2001 Fiscal Year Final Research Report Summary
Analysis for thin film delamination process and inverse analysis system considering a fine microstructure of interface and interfacial energy
| Project/Area Number |
12650075
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Materials/Mechanics of materials
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| Research Institution | Nagaoka University of Technology |
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Principal Investigator |
KOGUCHI Hideo Nagaoka University of Technology, Department of Mechanical Engineering, Professor, 工学部, 教授 (90143693)
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| Co-Investigator(Kenkyū-buntansha) |
IHARA Ikuo Nagaoka University of Technology, Department of Mechanical Engineering, Associate Professor, 工学部, 助教授 (80203280)
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| Project Period (FY) |
2000 – 2001
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| Keywords | Interface / Interfacial energy / Thin film / Delamination / Boundary element method / Interfacial structure / inverse analysis |
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| Research Abstract |
In the present study, we pursued to estimate an adhesive force by constructing a model of thin film delamination and considering a microstructure at the interface. The delamination process is similar to the adhesion one from a microscopic view. Hence, we made a program for simulation of a thin film adhesion process using BEM to simulate the delamination process. Molecular force was taken into account in the adhesion process. JKR theory has been compared with the experimental results and demonstrated the validity of algorithm of program. Then, an adhesion between a cylinder and a half-plane was analyzed using the program, the validity of the program was examined by comparing with the results based on JKR theory. A governing equation of displacement and coordinates of node were divided by an equilibrium length of atoms. Consequently, an accuracy and stability of calculation could be kept. The following results were deduced in the investigation
1. The validity and utilization of the present study could be shown through a comparison of adhesion radius and the maximum adhesive force deduced in our study with those in other adhesive theory
2. An adhesion between a cylinder with an uneven surface and a flat surface was analyzed. When the cylinder with the uneven surface was pressed down to the flat surface, the cylinder adhered to the flat surface keeping the distance of equilibrium length of atoms. It was found that the maximum adhesion force is proportional to the number of uneven of surface through the comparison of the maximum adhesion force, the radius of adhesion region and the surface traction
3. A new adhesion theory for nano size domain was presented considering surface stresses and surface energy
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