Cohesive Zone Modeling of Crack Propagation in FCC Single Crystals via Atomistic Simulations
| Autor: | Jang Hyun Kim, Hyeon Gyu Beom, Gi Hun Lee |
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| Rok vydání: | 2020 |
| Předmět: |
Materials science
Continuum mechanics Tension (physics) Traction (engineering) Metals and Alloys Fracture mechanics Mechanics Condensed Matter Physics Quantitative Biology::Cell Behavior Cohesive zone model Fracture toughness Mechanics of Materials Solid mechanics Materials Chemistry Fracture (geology) |
| Zdroj: | Metals and Materials International. 27:584-592 |
| ISSN: | 2005-4149 1598-9623 |
| DOI: | 10.1007/s12540-020-00693-x |
| Popis: | This paper presents a cohesive zone model of fracture in Cu and Ni single crystals under tension, based on an atomistic analysis. The molecular-statics approach based on the conjugate-gradient method was used to investigate the crack-growth behavior at the atomic level. The fracture toughness was evaluated on the basis of energy considerations, and the cohesive traction was calculated using the J integral and the atomic-scale separation in the cohesive zone. The cohesive traction and separation curves obtained using computational data from atomistic simulations were compared with the exponential form of continuum mechanics. The results showed that the exponential form satisfactorily represented the cohesive zone properties of Cu. However, the cohesive traction and separation curves for Ni were found to deviate from the exponential form in the softening stage, owing to small-scale nonlinear features near the cohesive zone. |
| Databáze: | OpenAIRE |
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