Advanced

Numerical modelling of fracture initiation in large steel specimens at impact

Wall, Ola LU (2002) In Engineering Fracture Mechanics 69(7). p.851-863
Abstract
Dynamic mode I fracture initiation in impact loaded single edge bend specimens with a quarter notch is investigated by numerical modelling and the results are compared with sets of experimental data from two different steel qualities. The finite element analysis include 2D (two-dimensional) plane strain, 2D plane stress and 3D models. No crack growth is included in the calculations. The impact velocities are approximately 15, 30 and 45 m/s and the specimen size is 320 x 75 mm. 2 with a thickness of 20 or 40 mm. Some specimens have side grooves. Details of the deflection of the specimens are accurately reproduced prior to crack initiation both by the 2D plane strain model and by the 3D model. The experiments were performed in the ductile to... (More)
Dynamic mode I fracture initiation in impact loaded single edge bend specimens with a quarter notch is investigated by numerical modelling and the results are compared with sets of experimental data from two different steel qualities. The finite element analysis include 2D (two-dimensional) plane strain, 2D plane stress and 3D models. No crack growth is included in the calculations. The impact velocities are approximately 15, 30 and 45 m/s and the specimen size is 320 x 75 mm. 2 with a thickness of 20 or 40 mm. Some specimens have side grooves. Details of the deflection of the specimens are accurately reproduced prior to crack initiation both by the 2D plane strain model and by the 3D model. The experiments were performed in the ductile to brittle transition region. It is assumed that cleavage fracture initiation can be predicted by the Ritchie-Knott-Rice (RKR) model, i.e. cleavage fracture initiates when the opening stress exceeds the macroscopic cleavage stress over a fixed, critical distance. At an impact velocity of 15 m/s, fracture initiation by void nucleation and growth is observed, though the RKR-conditions is seemingly fulfilled according to the computational results. Possible limitations in the use of the RKR model are discussed. (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, simulation, dynamic, fracture
in
Engineering Fracture Mechanics
volume
69
issue
7
pages
851 - 863
publisher
Elsevier
external identifiers
  • wos:000174831900005
  • scopus:0037192608
ISSN
1873-7315
DOI
10.1016/S0013-7944(01)00112-6
language
English
LU publication?
yes
id
2ad2afbe-f044-432e-aa92-6b735d0414a4 (old id 340842)
date added to LUP
2007-11-19 14:22:42
date last changed
2017-01-22 04:04:42
@article{2ad2afbe-f044-432e-aa92-6b735d0414a4,
  abstract     = {Dynamic mode I fracture initiation in impact loaded single edge bend specimens with a quarter notch is investigated by numerical modelling and the results are compared with sets of experimental data from two different steel qualities. The finite element analysis include 2D (two-dimensional) plane strain, 2D plane stress and 3D models. No crack growth is included in the calculations. The impact velocities are approximately 15, 30 and 45 m/s and the specimen size is 320 x 75 mm. 2 with a thickness of 20 or 40 mm. Some specimens have side grooves. Details of the deflection of the specimens are accurately reproduced prior to crack initiation both by the 2D plane strain model and by the 3D model. The experiments were performed in the ductile to brittle transition region. It is assumed that cleavage fracture initiation can be predicted by the Ritchie-Knott-Rice (RKR) model, i.e. cleavage fracture initiates when the opening stress exceeds the macroscopic cleavage stress over a fixed, critical distance. At an impact velocity of 15 m/s, fracture initiation by void nucleation and growth is observed, though the RKR-conditions is seemingly fulfilled according to the computational results. Possible limitations in the use of the RKR model are discussed.},
  author       = {Wall, Ola},
  issn         = {1873-7315},
  keyword      = {brittle,ductile,simulation,dynamic,fracture},
  language     = {eng},
  number       = {7},
  pages        = {851--863},
  publisher    = {Elsevier},
  series       = {Engineering Fracture Mechanics},
  title        = {Numerical modelling of fracture initiation in large steel specimens at impact},
  url          = {http://dx.doi.org/10.1016/S0013-7944(01)00112-6},
  volume       = {69},
  year         = {2002},
}