Brittle-quasibrittle transition in dynamic fracture: an energetic signature
| Autor: | Julien Scheibert, F. Celarie, Claudia Guerra, Davy Dalmas, Daniel Bonamy |
|---|---|
| Přispěvatelé: | Service de Physique et de Chimie des Surfaces et Interfaces (SPCSI), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Surface du Verre et Interfaces (SVI), Centre National de la Recherche Scientifique (CNRS), Facultad de Ingeniería Mecánica y Eléctrica, Universidad Autonoma de Nuevo Leon [Mexique] (UANL) |
| Rok vydání: | 2009 |
| Předmět: |
Materials science
fracture energy Nucleation General Physics and Astronomy FOS: Physical sciences 02 engineering and technology Physics - Classical Physics [SPI.MECA.SOLID]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Solid mechanics [physics.class-ph] 01 natural sciences Instability amorphous materials Physics::Geophysics Fracture toughness Brittleness brittle 0103 physical sciences [PHYS.MECA.SOLID]Physics [physics]/Mechanics [physics]/Solid mechanics [physics.class-ph] Composite material 010306 general physics roughness Strain energy release rate Condensed Matter - Materials Science dynamic fracture Classical Physics (physics.class-ph) Materials Science (cond-mat.mtrl-sci) Fracture mechanics 021001 nanoscience & nanotechnology Critical ionization velocity PMMA Fracture (geology) [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci] 0210 nano-technology 62.20.M 46.50.+a 61.43.-j fracture surface |
| Zdroj: | Physical Review Letters Physical Review Letters, 2010, 104 (4), pp.045501. ⟨10.1103/PhysRevLett.104.045501⟩ Physical Review Letters, American Physical Society, 2010, 104 (4), pp.045501. ⟨10.1103/PhysRevLett.104.045501⟩ |
| ISSN: | 1079-7114 0031-9007 |
| DOI: | 10.1103/PhysRevLett.104.045501⟩ |
| Popis: | Dynamic fracture experiments were performed in PMMA over a wide range of velocities and reveal that the fracture energy exhibits an abrupt 3-folds increase from its value at crack initiation at a well-defined critical velocity, below the one associated to the onset of micro-branching instability. This transition is associated with the appearance of conics patterns on fracture surfaces that, in many materials, are the signature of damage spreading through the nucleation and growth of microcracks. A simple model allows to relate both the energetic and fractographic measurements. These results suggest that dynamic fracture at low velocities in amorphous materials is controlled by the brittle/quasi-brittle transition studied here. 5 pages, 4 figures, published version, Article highlighted in Physical Review Focus (February 12th, 2010) |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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