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Effects of Varying Mean Stress and Stress Amplitude on the Fatigue of Polysilicon

Published online by Cambridge University Press:  01 February 2011

H. Kahn ,
R. Ballarini  and
A. H. Heuer
H. Kahn
Affiliation:
Department of Materials Science and Engineering, Case Western Reserve University Cleveland, OH 44106, USA
R. Ballarini
Affiliation:
Department of Materials Science and Engineering, Case Western Reserve University Cleveland, OH 44106, USA
A. H. Heuer
Affiliation:
Department of Materials Science and Engineering, Case Western Reserve University Cleveland, OH 44106, USA
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Abstract

Polycrystalline silicon (polysilicon) single edge-notched fatigue specimens with micrometer-sized dimensions were macromachined and subjected to cyclic loading using an integrated electrostatic actuator. The effects of fatigue were determined by comparing the monotonic bend strength measured after cyclic loading to the monotonic bend strength of specimens that received no cycling. Both strengthening and weakening were observed, depending on the levels of mean stress and fatigue stress amplitude during the cyclic loading. Monotonic loading with similar stress levels prior to bend strength measurements had no effect on measured bend strength. Possible physical mechanisms responsible for this fatigue behavior are discussed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 795: Symposium U – Thin Films - Stresses and Mechanical Properties X , 2003 , U4.7
Copyright
Copyright © Materials Research Society 2004

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References

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