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Glass breaks like metal, but at the nanometer scale
F Célarié1, S Prades, D Bonamy
1Laboratoire des Verres, UMR CNRS-UM2 5587, Université Montpellier 2, C.C. 69 Place Bataillon, F-34095 Montpellier Cedex 5, France.
Physical Review Letters
|March 14, 2003
Summary
Nanoscale damage cavities near crack tips in glass may explain its non-linear elasticity. This ductile fracture mechanism, similar to metals, could unify fracture surface observations across materials.
Area of Science:
- Materials Science
- Fracture Mechanics
- Nanotechnology
Background:
- Glass exhibits a departure from linear elasticity near crack tips.
- Ductile fracture mechanisms are well-documented in metallic materials at the micrometer scale.
- Fracture surface morphologies of glass and metals show striking similarities across length scales.
Purpose of the Study:
- To investigate the presence and nature of nanoscale features ahead of a stress-corrosion crack tip in glass.
- To elucidate the underlying fracture mechanism responsible for the observed mechanical behavior and surface morphology in glass.
Main Methods:
- In situ atomic force microscopy (AFM) experiments were conducted to observe crack tip phenomena in real-time.
- High-resolution imaging allowed for the detection of nanoscale features associated with crack propagation.
Main Results:
- The study revealed the presence of nanoscale damage cavities immediately preceding the stress-corrosion crack tip in glass.
- These cavities correlate with the observed deviation from linear elastic behavior near the crack tip.
Conclusions:
- The identified nanoscale damage cavities suggest a ductile fracture mechanism in glass, previously uncharacterized at this scale.
- This ductile mechanism may account for the macroscopic similarities between fracture surfaces of glass and metallic alloys.