期刊
JOURNAL OF MICROMECHANICS AND MICROENGINEERING
卷 30, 期 12, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/1361-6439/abbf89
关键词
strength distributions; flaw populations; polysilicon microelectromechanical system; shoulder fillets; fracture
类别
资金
- Center for Integrated Nanotechnologies, a Department of Energy office of Basic Energy Sciences
- U.S. Department of Energy National Nuclear Security Administration [DE-NA0003525]
The failure forces and fracture strengths of polysilicon microelectromechanical system (MEMS) components in the form of stepped tensile bars with shoulder fillets were measured using a sequential failure chain methodology. Approximately 150 specimens for each of four fillet geometries with different stress concentration factors were tested. The resulting failure force and strength distributions of the four geometries were related by a common sidewall flaw population existing within different effective stressed lengths. The failure forces, strengths, and flaw population were well described by a weakest-link based analytical framework. Finite element analysis was used to verify body-force based expressions for the stress concentration factors and to provide insight into the variation of specimen effective length with fillet geometry. Monte Carlo simulations of flaw size and location, based on the strength measurements, were also used to provide insight into fillet shape and size effects. The successful description of the shoulder fillet specimen strengths provides further empirical support for application of the strength and flaw framework in MEMS fabrication and design optimization.
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