EN 62047-12:2011

FOREWORD
1 Scope
2 Normative references
3 Terms and definitions
4 Test equipment
5 Specimen
6 Test conditions
7 Initial measurement
8 Test
9 Test report
Annex A (informative) - Example of testing using an
        electrostatic device with an integrated actuation
        component and displacement detection component
Annex B (informative) - Example of testing using an external
        drive and a device with an integrated strain gauge
        for detecting displacement
Annex C (informative) - Example of electromagnetic drive
        out-of-plane vibration test (external drive
        vibration test)
Annex D (informative) - Theoretical expression on fatigue
        life of brittle materials based on Paris' law
        and Weibull distribution
Annex E (informative) - Analysis examples
Bibliography
Annex ZA (normative) - Normative references to international
         publications with their corresponding European
         publications

IEC 62047-12:2011 specifies a method for bending fatigue testing using resonant vibration of microscale mechanical structures of MEMS (micro-electromechanical systems) and micromachines. This standard applies to vibrating structures ranging in size from 10 μm to 1 000 μm in the plane direction and from 1 μm to 100 μm in thickness, and test materials measuring under 1 mm in length, under 1 mm in width, and between 0,1 μm and 10 μm in thickness. The main structural materials for MEMS, micromachine, etc. have special features, such as typical dimensions of a few microns, material fabrication by deposition, and test piece fabrication by means of non-mechanical machining, including photolithography. The MEMS structures often have higher fundamental resonant frequency and higher strength than macro structures. To evaluate and assure the lifetime of MEMS structures, a fatigue testing method with ultra high cycles (up to 10¹²) loadings needs to be established. The object of the test method is to evaluate the mechanical fatigue properties of microscale materials in a short time by applying high load and high cyclic frequency bending stress using resonant vibration.