Mechanical properties of MEMS structures
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Autor:innen
Autor:in (Körperschaft)
Publikationsdatum
2005
Typ der Arbeit
Studiengang
Typ
04B - Beitrag Konferenzschrift
Herausgeber:innen
Herausgeber:in (Körperschaft)
International Congress on Fracture (ICF)
Betreuer:in
Übergeordnetes Werk
11th International Conference on Fracture 2005 (ICF11)
Themenheft
DOI der Originalpublikation
Link
Reihe / Serie
Reihennummer
Jahrgang / Band
5
Ausgabe / Nummer
Seiten / Dauer
3800-3805
Patentnummer
Verlag / Herausgebende Institution
Verlagsort / Veranstaltungsort
Turin
Auflage
Version
Programmiersprache
Abtretungsempfänger:in
Praxispartner:in/Auftraggeber:in
Zusammenfassung
Mechanical characterization of MEMS (micro electromechanical systems) materials is increasingly important in view of improving reliability and assessing the life time of new miniaturized devices. In this paper first a number of testing methods are described. These methods include tensile, torsion and fatigue testing of specially designed microstructures. Difficulties arise from manufacturing and handling of small structures and the determination of its geometrical dimensions which directly affect the accuracy of material parameters extracted from the experiments. In addition, the measurement of mechanical parameters like small forces and torques or strains poses a challenge. This paper focuses on size effects in rolled copper foils of thickness between 10 and 250 microns as determined from tensile testing. Tensile testing was chosen as a testing method in order to minimize strain gradients. Depending on the size the copper foils are tested in a classical setup or in a special tensile apparatus which is adapted to the small size of the specimens. The special setup consists of a balance to measure the applied force. The specimens are strained with a lead screw driven translation stage. In order to take care of slip and elasticity in the fixations the strain is measured optically directly on the sample using a least square template matching algorithm. It was found that depending on the thickness of the foils the average fracture strain decreases from about 15% down to .5 % for the 250 and 10 micron specimens, respectively. In order to find a reason for this dramatic change many efforts have been undertaken in order to characterize the specimens more precisely. The microstructure of the samples was determined using various methods including conventional micrographs, hardness measurements and X-ray diffraction.
Schlagwörter
Copper, Elasticity, Fatigue testing, Lead screws, Materials testing apparatus, Microstructure, Strain, Template matching, Tensile testing, Torsion testing, X ray diffraction, 10 micron, Applied forces, Conventional micrographs, Copper foils, Forces and torques, Fracture strain, Geometrical dimensions, Hardness measurement, Least Square, Life-times, Material parameter, Mechanical characterizations, Mechanical parameters, MEMS-structure, Micro electro mechanical system, Miniaturized devices, Screw-driven, Size effects, Strain gradients, Template-matching algorithms, Testing method, Translation stage, Fracture
Fachgebiet (DDC)
620 - Ingenieurwissenschaften und Maschinenbau
Veranstaltung
11th International Conference on Fracture 2005 (ICF11)
Startdatum der Ausstellung
Enddatum der Ausstellung
Startdatum der Konferenz
20.03.2005
Enddatum der Konferenz
25.03.2005
Datum der letzten Prüfung
ISBN
978-1-61782-063-2
ISSN
Sprache
Englisch
Während FHNW Zugehörigkeit erstellt
Nein
Zukunftsfelder FHNW
Publikationsstatus
Veröffentlicht
Begutachtung
Peer-Review des Abstracts
Open Access-Status
Closed
Lizenz
Zitation
DUAL, Jürg, Gerd SIMONS, Jürgen VILLAIN und Chr. WEIPPERT, 2005. Mechanical properties of MEMS structures. In: International Congress on Fracture (ICF) (Hrsg.), 11th International Conference on Fracture 2005 (ICF11). Turin. 2005. S. 3800–3805. ISBN 978-1-61782-063-2. Verfügbar unter: https://irf.fhnw.ch/handle/11654/49557