Fracture Appearance Evaluation of High Performance Pipeline Steel DWTT Specimen with Delamination Cracks |
| Journal |
Key Engineering Materials (Volumes 324 - 325) |
| Volume |
Fracture and Damage Mechanics V |
| Edited by |
M.H. Aliabadi, Qingfen Li, Li Li and F.-G. Buchholz |
| Pages |
59-62 |
| DOI |
10.4028/www.scientific.net/KEM.324-325.59 |
| Online since |
November, 2006 |
| Authors |
Zheng Yang,
Wan Lin Guo,
Chun Yong Huo,
Yi Wang
|
| Keywords |
Delamination Crack, DWTT, Pipeline Steel |
| Abstract |
The delamination cracks and its effects on the fracture of pipeline steel are investigated
experimentally by using of Drop-Weight Tear Test (DWTT). The delamination cracks are produced
by the stress perpendicular to the weak interfaces before main crack beginning or accelerating, no new
delamination crack is produced during the stabile propagation of fracture. The quantity, splay degree
of delamination crack and the space between two delamination cracks are influenced by the stress
state of the crack tip at beginning or accelerating point of main crack and the length of delamination
crack is influenced by the stress state of the crack tip during the propagation of fracture. The surface of
delamination crack is cleavage fracture appearance with large cleavage facet. There is no
delamination crack on the brittle fracture surface below the brittle-to-ductile temperature or on the
brittle fracture region of mix-mode fracture surface with ductile and brittle region. The part of fracture
surfaces with delamination crack ought to be evaluated as the shear area because the delamination
cracks are produced only on the ductile fracture surface or on the ductile part of fracture surface. |
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