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Experimental Mechanics

, Volume 53, Issue 5, pp 783–794 | Cite as

MEMS-based Universal Fatigue-Test Technique

  • L. A. LiewEmail author
  • D. T. Read
  • N. BarbosaIII
Article

Abstract

We have developed a MEMS (micro electro mechanical systems)—based method for fatigue testing of micrometer— millimeter-sized specimens of any material (hence ‘universal’). The miniature, re-usable, stand-alone fatigue test frame is fabricated as a single MEMS chip. Specimens of any material can be manually mounted in the chip and fatigue-tested. We describe the design and construction of the MEMS device and specimens, the test protocol and data analysis procedure, and show stress versus number of cycles to failure (S-N) results for 25 μm thick Al 1145 H19 foil. The S-N results are in accord with expectations, and examination of the fracture surface by scanning electron microscopy shows distinct regions corresponding to slow and fast crack growth.

Keywords

Fatigue Crack Micro-electro-mechanical systems Comb drive actuator Materials reliability 

Notes

Acknowledgment

The authors thank Yunda Wang, from the Department of Mechanical Engineering, University of Colorado, Boulder, for helpful discussions on MEMS capacitive sensing circuitry.

Supplementary material

Video 1

MEMS fatigue test instrument applying loads to a Al 1145 H19 specimen. (MPG 24058 kb)

Video 2

time-lapse movie consisting of optical micrographs of a Al 1145 H19 specimen’s gage section, showing fatigue crack initiation, slow crack growth, and rapid crack growth (failure) over 7x107 cycles. (MPG 1414 kb)

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Copyright information

© Society for Experimental Mechanics 2012

Authors and Affiliations

  1. 1.Materials Reliability DivisionNational Institute of Standards and TechnologyBoulderUSA
  2. 2.Department of Mechanical EngineeringUniversity of Colorado at BoulderBoulderUSA

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