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Automatic Mixed-Mode Crack Propagation Computations using a combined Hexahedral/Tetrahedral-Approach
KTH, School of Engineering Sciences (SCI), Solid Mechanics (Dept.), Solid Mechanics (Div.).
2009 (English)Licentiate thesis, comprehensive summary (Other academic)
Place, publisher, year, edition, pages
Stockholm: KTH , 2009. , x p.
Series
Trita-HFL. Report / Royal Institute of Technology, Solid Mechanics, ISSN 1654-1472 ; 0482
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:kth:diva-11823OAI: oai:DiVA.org:kth-11823DiVA: diva2:283810
Presentation
2010-01-18, Sal E3, Osquars backe 14, KTH, Stockholm, 10:15 (English)
Opponent
Supervisors
Available from: 2010-01-11 Created: 2009-12-30 Last updated: 2013-01-15Bibliographically approved
List of papers
1. Automatic crack-insertion for arbitrary crack growth
Open this publication in new window or tab >>Automatic crack-insertion for arbitrary crack growth
2008 (English)In: Engineering Fracture Mechanics, ISSN 0013-7944, E-ISSN 1873-7315, Vol. 75, no 3-4, 404-416 p.Article in journal (Refereed) Published
Abstract [en]

A crack-insertion tool for automatic non-planar crack propagation calculations is under development. The final volume mesh of the cracked structure is achieved by a new approach. The cracked structure boundary is modelled as a discretized skin. A tube-like domain enclosing the crack-front is traced and filled with hexahedral elements while the remaining cracked structure is meshed with tetrahedral elements. The two separate meshes are finally connected by linear MPC equations. Results show that the method works very well for curved crack shapes in complex structures.

Keyword
finite element analysis, crack growth, mixed mode fracture, automatic, remeshing
National Category
Engineering and Technology
Identifiers
urn:nbn:se:kth:diva-25051 (URN)10.1016/j.engfracmech.2007.01.003 (DOI)000252231800011 ()2-s2.0-36248993970 (Scopus ID)
Note
QC 20101006Available from: 2010-10-06 Created: 2010-10-06 Last updated: 2010-10-06Bibliographically approved
2. Automatic 3-D crack propagation calculations: a pure hexahedral element approach versus a combined element approach
Open this publication in new window or tab >>Automatic 3-D crack propagation calculations: a pure hexahedral element approach versus a combined element approach
2009 (English)In: International Journal of Fracture, ISSN 0376-9429, E-ISSN 1573-2673, Vol. 157, no 1-2, 109-118 p.Article in journal (Refereed) Published
Abstract [en]

This article presents an evaluation of two different crack prediction approaches based on a comparison of the stress intensity factor distribution for three example problems. A single edge notch specimen and a quarter circular corner crack specimen subjected to shear displacements and a three point bend specimen with a crack inclined to the mid-plane are examined. The stress intensity factors are determined from the singular stress field close to the crack front. Two different fracture criteria are adopted for the calculation of an equivalent stress intensity factor and crack deflection angle. The stress intensity factor distributions for both numerical methods agree well to available reference solutions. Deviations are recorded at crack front locations near the free surface probably due to global contraction effects and the twisting behaviour of the crack front. Crack propagation calculations for the three point bending specimen give results that satisfy intuitive expectations. The outcome of the study encourages further pursuit of a crack propagation tool based on a combination of elements.

Keyword
Linear elastic fracture mechanics, Finite element method, Crack growth, Mixed mode, Stress intensity factor
National Category
Engineering and Technology
Identifiers
urn:nbn:se:kth:diva-25053 (URN)10.1007/s10704-009-9313-z (DOI)000268791100011 ()2-s2.0-67749122087 (Scopus ID)
Note
QC 20101006Available from: 2010-10-06 Created: 2010-10-06 Last updated: 2010-10-06Bibliographically approved
3. Mesh design for direct and indirect evaluation of mixed mode stress intensity factors in three dimensions
Open this publication in new window or tab >>Mesh design for direct and indirect evaluation of mixed mode stress intensity factors in three dimensions
(English)Report (Other academic)
Series
Report / The Royal Institute of Technology, Department of Solid Mechanics, ISSN 1104-6813 ; 184
National Category
Engineering and Technology
Identifiers
urn:nbn:se:kth:diva-25054 (URN)
Note
QC 20101006Available from: 2010-10-06 Created: 2010-10-06 Last updated: 2010-10-06Bibliographically approved

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