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- Title
Some experimental observations on crack closure and crack-tip plasticity.
- Authors
Lopez-Crespo, P.; Shterenlikht, A.; Yates, J. R.; Patterson, E. A.; Withers, P. J.
- Abstract
This study presents a methodology for evaluating crack closure and the effect of crack-tip plasticity on stress intensity. Full-field displacement maps obtained by digital image correlation are used to obtain the mixed-mode, crack-driving force. The methodology allows the quantification of the effect of a range of contact phenomena: effects arising from interlocking, plastic deformation of crack face asperities and wedging generated as a consequence of sliding displacements of fatigue cracks have been identified. By evaluating the effective crack-tip stress intensity factor, crack opening levels can be quantified for both mode I and mode II. Moreover, the approach can take into account plasticity effects local to the crack in determining the stress intensity factor. All the information can be extracted in a non-contacting fashion with equipment that can be easily incorporated into industrial environments.
- Subjects
MATERIAL fatigue; FRACTURE mechanics; MATERIAL plasticity; STRAINS &; stresses (Mechanics); METHODOLOGY
- Publication
Fatigue & Fracture of Engineering Materials & Structures, 2009, Vol 32, Issue 5, p418
- ISSN
8756-758X
- Publication type
Article
- DOI
10.1111/j.1460-2695.2009.01345.x