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The dislocation-free zone at a mode I crack tip

✍ Scribed by Jianqiao Chen; Shigeo Takezono

Publisher: Elsevier Science
Year: 1995
Tongue: English
Weight: 355 KB
Volume: 50
Category: Article
ISSN: 0013-7944
DOI: 10.1016/0013-7944(94)00207-x

No coin nor oath required. For personal study only.

✦ Synopsis

The distribution of dislocations in the vicinity of a mode I crack tip is formulated based on the observation of a single crystal specimen of aluminium by transmission electron microscopy (TEM). Closed form expressions of the dislocation density function and the dislocation-free zone (DFZ) condition for a mode I crack are derived. The relationship between the size of the crack, dislocation-free zone and plastic zone is obtained as a function of the applied stress. The characteristic of this model is compared with lhat of the model proposed by Chang and Ohr for a mode III crack.

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