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Imperfection density function and crack-tip enhancement: Validation against symmetrical bending of circular tungsten carbide plates
Grindsjön Research Centre, Swedish Defence Research Agency, Tumba, Sweden.
Grindsjön Research Centre, Swedish Defence Research Agency, Tumba, Sweden.
Linköping University, Department of Management and Engineering, Solid Mechanics. Linköping University, The Institute of Technology.
2007 (English)In: Mechanics of materials (Print), ISSN 0167-6636, Vol. 39, no 8, 753-759 p.Article in journal (Refereed) Published
Abstract [en]

Experiments and finite element analyses of symmetrical bending of circular tungsten carbide plates have been carried out. In the numerical simulations, a material imperfection density that accounts for size effects on the failure strength was considered. In addition, a scaling of the solution near the crack-tips was performed, in order to improve the crack propagation prediction and to ensure a mesh independent fracture energy. The numerical results on failure initiation are shown to be in good agreement with the experiments. However, numerical noise in the solution makes it difficult to handle the crack propagation, which is a problem inherent to all brittle materials.

Place, publisher, year, edition, pages
Elsevier, 2007. Vol. 39, no 8, 753-759 p.
Keyword [en]
Explicit finite element analysis, Material imperfections, Element erosion, Tungsten carbide
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:liu:diva-13418DOI: 10.1016/j.mechmat.2006.12.005ISI: 000246315700003OAI: oai:DiVA.org:liu-13418DiVA: diva2:20692
Available from: 2005-11-09 Created: 2005-11-09 Last updated: 2012-08-24
In thesis
1. On failure modelling in finite element analysis: material imperfections and element erosion
Open this publication in new window or tab >>On failure modelling in finite element analysis: material imperfections and element erosion
2005 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

This dissertation concerns failure modelling with material imperfections and element erosion in finite element analyses. The aim has been to improve the element erosion technique, which is simple to use and implement and also computationally inexpensive. The first part of the dissertation serves as an introduction to the topic and as a summary of the methodologies presented in the following part. The second part consists of seven appended papers. In paper A the standard element erosion technique is used for projectile penetration. In papers B and C a methodology that accounts for size effects is developed and applied to crack initiation in armour steel and tungsten carbide. A methodology to better predict the stress state at crack tips with coarse meshes is presented and applied to armour steel in paper D. Papers E and F concern the development of selective mass scaling which allows for larger time steps in explicit methods. Finally, in paper G the previously presented methodologies are used in combination and validated against experimental results on tungsten carbide. The computations show good agreement with the experimental results on failure initiation for both materials, while the computational results on the propagation of cracks show better agreement for the armour steel than for the tungsten carbide.

Place, publisher, year, edition, pages
Institutionen för konstruktions- och produktionsteknik, 2005
Series
Linköping Studies in Science and Technology. Dissertations, ISSN 0345-7524 ; 973
Keyword
finite element method, element erosion, material failure, material imperfections, crack-tip
National Category
Applied Mechanics
Identifiers
urn:nbn:se:liu:diva-4679 (URN)91-85457-34-5 (ISBN)
Public defence
2005-12-02, C3, C-huset, Campus Valla, Linköpings universitet, Linköping, 10:15 (English)
Opponent
Supervisors
Note
On the day of the public defence of the doctoral thesis, the status of articles I, III and IV was Accepted and article VII was Submitted.Available from: 2005-11-09 Created: 2005-11-09 Last updated: 2010-04-06

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Simonsson, Kjell

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