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Dynamic crack propagation in large steel specimens

Wall, Ola LU (2002) In Engineering Fracture Mechanics 69(7). p.835-849
Abstract
Dynamic fracture experiments on crack initiation and crack growth in single edge bend specimens are performed. The impact velocity is in the range of 14 to 50 m/s and the specimen size is 320 x 75 mm with a thickness varying from 18 to 40 mm. The experiments are recorded by high speed photography. Two different steel qualities are investigated and their constitutive characterisation are obtained from uni-axial tension tests and shear tests with strain rates in the range 10(-4) to 10(3)s(-1) and tension tests at temperatures between -196 and 600degreesC. One of the materials exhibits a transition from a ductile dimple fracture to a brittle cleavage fracture as the loading velocity increases and as the specimen thickness increases. Scanning... (More)
Dynamic fracture experiments on crack initiation and crack growth in single edge bend specimens are performed. The impact velocity is in the range of 14 to 50 m/s and the specimen size is 320 x 75 mm with a thickness varying from 18 to 40 mm. The experiments are recorded by high speed photography. Two different steel qualities are investigated and their constitutive characterisation are obtained from uni-axial tension tests and shear tests with strain rates in the range 10(-4) to 10(3)s(-1) and tension tests at temperatures between -196 and 600degreesC. One of the materials exhibits a transition from a ductile dimple fracture to a brittle cleavage fracture as the loading velocity increases and as the specimen thickness increases. Scanning electron microscope fractographs show that the density of plastic bridges within cleavage ligaments decreases with increasing impact velocity and with increasing specimen thickness. It is also noted that the local crack propagation direction defects from the global one in cleavage fracture areas with a high density of plastic bridges. The other material fails in a ductile mode in all the investigated cases. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
brittle, ductile, experiments, dynamic, fracture
in
Engineering Fracture Mechanics
volume
69
issue
7
pages
835 - 849
publisher
Elsevier
external identifiers
  • wos:000174831900004
  • scopus:0037192601
ISSN
1873-7315
DOI
10.1016/S0013-7944(01)00111-4
language
English
LU publication?
yes
id
4fdba641-d6e6-4220-b2b2-c3f3ec768d96 (old id 340840)
date added to LUP
2007-11-19 14:35:32
date last changed
2017-01-08 04:53:42
@article{4fdba641-d6e6-4220-b2b2-c3f3ec768d96,
  abstract     = {Dynamic fracture experiments on crack initiation and crack growth in single edge bend specimens are performed. The impact velocity is in the range of 14 to 50 m/s and the specimen size is 320 x 75 mm with a thickness varying from 18 to 40 mm. The experiments are recorded by high speed photography. Two different steel qualities are investigated and their constitutive characterisation are obtained from uni-axial tension tests and shear tests with strain rates in the range 10(-4) to 10(3)s(-1) and tension tests at temperatures between -196 and 600degreesC. One of the materials exhibits a transition from a ductile dimple fracture to a brittle cleavage fracture as the loading velocity increases and as the specimen thickness increases. Scanning electron microscope fractographs show that the density of plastic bridges within cleavage ligaments decreases with increasing impact velocity and with increasing specimen thickness. It is also noted that the local crack propagation direction defects from the global one in cleavage fracture areas with a high density of plastic bridges. The other material fails in a ductile mode in all the investigated cases.},
  author       = {Wall, Ola},
  issn         = {1873-7315},
  keyword      = {brittle,ductile,experiments,dynamic,fracture},
  language     = {eng},
  number       = {7},
  pages        = {835--849},
  publisher    = {Elsevier},
  series       = {Engineering Fracture Mechanics},
  title        = {Dynamic crack propagation in large steel specimens},
  url          = {http://dx.doi.org/10.1016/S0013-7944(01)00111-4},
  volume       = {69},
  year         = {2002},
}