Correction to the crack extension direction in numerical modelling of mixed mode crack paths

Publication: Research - peer-reviewJournal article – Annual report year: 2007

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In order to avoid introduction of an error when a local crack-growth criterion is used in an incremental crack growth formulation, each straight crack extension would have to be infinitesimal or have its direction corrected. In this paper a new procedure to correct the crack extension direction is proposed in connection with crack growth analyzed by the Dual Boundary Element Method (DBEM). The proposed correction procedure and a reference correction procedure already described in the literature are evaluated by solving two different computational crack growth examples. In the two examples it is found that analyses of the crack paths performed with the proposed crack. correction procedure using big increments, of crack extension Are in excellent agreement with analyses of the crack paths performed by using very small increments of crack extension. Furthermore, it is shown that the reference correction procedure has a tendency to overcorrect the crack growth direction if the stop criterion for the iterative correction procedure is not calibrated in each new crack growth analysis.
Original languageEnglish
JournalInternational Journal of Fracture
Publication date2007
Volume143
Journal number2
Pages195-202
ISSN0376-9429
DOIs
StatePublished
CitationsWeb of Science® Times Cited: 5

Keywords

  • boundary element method, crack correction procedure, crack extension direction
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