| Project/Area Number |
11650100
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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 | Tokyo Denki University |
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Principal Investigator |
TSUJI Hirokazu Tokyo Denki University, School of Science and Engineering, Associate Professor, 理工学部, 助教授 (10163841)
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| Project Period (FY) |
1999 – 2000
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| Project Status |
Completed (Fiscal Year 2000)
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| Budget Amount *help |
¥2,200,000 (Direct Cost: ¥2,200,000)
Fiscal Year 2000: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 1999: ¥1,500,000 (Direct Cost: ¥1,500,000)
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| Keywords | Micromachine / Micromechanism / Fatigue / Micromaterial / Fatigue test / Single-crystalline silicon / Anisotropy etching |
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| Research Abstract |
Elastic deformation of the microstructure such as an elasticity hinge was used for a movable mechanism of MEMS.The fabrication process of the microstructure often yielded the stress concentration. Static and fatigue strength are evaluated for notched type specimens fabricated from silicon wafers by micromachining, that is, PVD and the photo-etching processes. Results are summarized as follows :
1. A micromaterial testing machine is developed for four points bending under statically and cyclic loading. An algorithm for the computer image processing to measure the specimen deformation is improved.
2. Limitation between the loading frequency and deformation of the specimen is examined base on the energy law. Maximum frequency experimentally obtained under the fatigue test is half of the theory.
3. An anisotropy etching has been applied to single crystalline silicon and V-groove is introduced. From the SEM observation a notch root has a radius of sub-micron order.
4. It is found that the static strength of the notched specimen can be evaluated by the stress intensity factor, except for the extremely shallow notch.
5. Fatigue test for 10^6 cycles is done for notched specimen, however no change is observed around the root of the notch.
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