Theta-like specimens for measuring mechanical properties at the small-scale: effects of non-ideal loading
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Edwin R. Fuller
Abstract
As material structures, and devices fabricated from them, shrink to the nano-scale, it is ever more difficult to measure accurately the mechanical properties needed for designing small-scale devices and for assessing reliability. A promising test configuration for localized, small-scale uniaxial tensile measurements is the theta specimen. Stress distributions in this test configuration are examined via finite element analysis. When loaded uniformly with a double-articulating loading platen, a uniform uniaxial stress state is realized in the test gauge. When alternative, more easily realized experimentally, loading configurations are used (i. e., line or point contact), large secondary stresses develop. For each loading configuration, influences of non-ideal load application are elucidated. Two design modifications are considered to mitigate undesirable stresses: a compliant layer and an extended upper loading tab. The latter yields the most favorable stress state and is the most tolerant to non-ideal loading.
References
[1] A.J.Durelli, S.Morse, V.J.Parks: Mater. Res. Stand.2 (1962) 114.Search in Google Scholar
[2] A.J.Durelli, V.J.Parks: Brit. J. Appl. Phys.18 (1967) 387.10.1088/0508-3443/18/3/132Search in Google Scholar
[3] A.J.Durelli, in: Applied Stress Analysis, Prentice-Hall, New Jersey (1967) 173.Search in Google Scholar
[4] G.D.Quinn, E.R.Fuller, Jr., D.Xiang, A.Jillavenkatesa, L.Ma, D.T.Smith, J.Beall, in: E. Lara-Curzio, D. Zhu, W.M. Kriven (Eds.), Ceramic Engineering and Science Proceedings, Volume 26, Issue 2 (2005) 117.Search in Google Scholar
[5] E.R.Fuller, Jr., G.D.Quinn, R.F.Cook, in: Proceeding of 2007 International Conference on Frontiers of Characterization and Metrology for Nanoelectronics, National Institute of Standards and Technology, Gaithersburg, MD, (Strength and Fracture Measurements at the Nano Scale) (2007).Search in Google Scholar
[6] W.Weibull: J. Appl. Mech.18 (1951) 293.10.1115/1.4010337Search in Google Scholar
[7] N.A.Weil, I.M.Daniel: J. Am. Ceram. Soc.47 (1964) 268.10.1111/j.1151-2916.1964.tb14413.xSearch in Google Scholar
[8] N.Alem, V.P.Dravid, E.R.Fuller, Jr.: private communication.Search in Google Scholar
© 2007, Carl Hanser Verlag, München
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Articles in the same Issue
- Contents
- Contents
- Editorial
- Editorial
- Basic
- In-situ measurement of local strain partitioning in a commercial dual-phase steel
- Threshold strength and residual stress analysis of zirconia–alumina laminates
- Threshold strength prediction for laminar ceramics from bifurcated crack path simulation
- First observation of a hexagonal close packed metastable intermetallic phase between Cu and Al bilayer films
- Electric-field induced phase transition in a near-surface layer of a PbMg0.33Nb0.67O3-28% PbTiO3 (001) single-crystalline plate
- Modelling the onset of oxide formation on metal surfaces from first principles
- Applied
- Delamination of stiff islands patterned on stretchable substrates
- Crack formation in surface layers with strain gradients
- Theta-like specimens for measuring mechanical properties at the small-scale: effects of non-ideal loading
- Indentation response of single-crystalline GaAs in the nano-, micro-, and macroregime
- Self-assembly of high-performance multi-tube carbon nanotube field-effect transistors by ac dielectrophoresis
- Biphasic, but monolithic scaffolds for the therapy of osteochondral defects
- Review
- Recent advances in piezospectroscopy
- Notifications
- DGM News
