Fracture mechanical modeling of brittle crack propagation and arrest of steel
Conference
·
OSTI ID:122510
- Univ. of Tokyo (Japan)
- Nippon Steel Corp., Futtsu, Chiba (Japan). Steel Research Laboratories
A brittle fracture propagation and arrest model based on the local fracture stress criterion is proposed. Dynamic fracture toughness is calculated as functions of yield stress, local fracture stress, temperature and crack velocity. The model predicts an upper limit crack velocity, which is closely related to the quasi-Rayleigh wave speeds of plastic deformation. The model also incorporates the influence of shear-lips formed near the plate surface and of the crack tunneling. The shear-lips have a pronounced effect on suppressing crack propagation, especially at high temperature, through crack-closure stress exerted on them. A lower bound nominal stress intensity factor, which may correspond to crack arrest toughness, exists and shows a transition behavior with respect to temperature. Associated lower bound crack velocity range agrees with previously obtained experimental data.
- OSTI ID:
- 122510
- Report Number(s):
- CONF-950740--; ISBN 0-7918-1331-2
- Country of Publication:
- United States
- Language:
- English
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