Journal
APPLIED PHYSICS LETTERS
Volume 94, Issue 25, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3157276
Keywords
fracture mechanics; metallic thin films; nanostructured materials; stress effects; transmission electron microscopy
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Funding
- Korea Institute of Metals and Machinery
- National Science Foundation, USA [0625650]
- Directorate For Engineering
- Div Of Civil, Mechanical, & Manufact Inn [0625650] Funding Source: National Science Foundation
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To study the effect of stress concentration at the nanoscale, we performed fracture experiments on single edge notched thin film specimens inside the transmission electron microscope. Even at about 4 GPa stress at the notch tip, the specimens failed far away from the notch at places with no apparent stress concentration. The in situ electron microscopy showed evidence of little or no plastic deformation at the notch tip. We propose that the apparent notch insensitivity arises from the breakdown of the classical fracture mechanics at the nanoscale, where materials fail by reaching a uniform rupture stress and not due to stress concentration.
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