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Home  >  Journal list  >  Journal of the Society of Materials Science, Japan  >  Vol.55  No.3 (2006)  >  pp.290-294

Journal of the Society of Materials Science, Japan
<<Previous article Vol.55  No.3 (2006)   pp.290 - 294 Next article>>

Proposal of a Reliability-Based Design Method for Static and Fatigue Strength of MEMS Micromirror

Satoshi IZUMI1), Masayuki KADOWAKI1), Shinsuke SAKAI1), Yuzuru UEDA2) and Atsushi SUZUKI2)
1) Dept. of Mech. Eng., Univ. of Tokyo
2) Visionary Business Center, Nippon Signal


MEMS micromirror is used as optical switching or scanning devices, etc. Since the device is made from single crystalline silicon, the fracture stress involves large scattering. Therefore, reliability-based design procedure is indispensable. We propose a method to detect the design stress of both static and fatigue strengths.
As for static strength, a method to determine design stress by using Bayesian inference is proposed, where the design stress is determined by combining a few number of strength data of actual product and prior distribution based on sufficient experimental data. The proposed method is verified by simulated data through the comparison with conventional maximum likelihood method. It is found that the proposed method is especially effective when there is not sufficient strength data. As for the design stress for fatigue strength, a method to evaluate fatigue life in general working environment by extrapolating the experimental data of accelerated fatigue life tests is proposed. As a result, the fatigue design chart based on 99% prediction interval is shown.


Keyword:
MEMS, Reliability, Design stress, Brittle fracture, Fatigue strength, Bayesian inference, Maximum likelihood method

Received: June 16, 2005
Published online: April 26, 2006
Copyright (c) 2006 by The Society of Materials Science, Japan

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