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Erschienen in:
2020 | OriginalPaper | Buchkapitel
An Atomic-Level Unified Criterion for Brittle Fracture
verfasst von : Kai Huang, Takashi Sumigawa, Takahiro Shimada, Takayuki Kitamura
Erschienen in: Proceedings of the Third International Conference on Theoretical, Applied and Experimental Mechanics
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Abstract
This paper aims to propose a unified criterion for brittle fracture of general (blunt) notches and ideal (sharp) cracks. A new fracture parameter, i.e., atomic energy release rate (ERR), for which the atomic discrete nature is fully taken into account, is defined based on the concept of atomic fracture mechanics (AFM). The results show that the proposed atomic ERR criterion works well for a nano-sized notch even when the notched sample becomes extremely small. Compared with an ideal crack, it is found that the magnitude of the critical atomic ERR at fracture is in good agreement with that of an ideal crack. Hence, brittle fracture of both a notch and a crack can be described by using a unique fracture parameter, providing a unified description at the atomic level.