Determination of the J integral for laminated double cantilever beam specimens: The curvature approach

A new approach is proposed for measuring the J integral (and thus the fracture resistance) of interface cracks in multiply laminates. With this approach the J integral is found from beam curvatures and applied moments. Knowledge of ply layup and stiffness is not required. In order to test the accura...

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Bibliographic Details
Published inEngineering fracture mechanics Vol. 96; pp. 37 - 48
Main Authors Rask, M., Sørensen, B.F.
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 01.12.2012
Subjects
Bending moments
Bridging
Cantilever beams
Curvature
Delamination
Fibre reinforced materials
Fracture mechanics
Interface fracture
J integral
Laminates
Mathematical analysis
Strain gauges
J integral
Bridging
Delamination
Fibre reinforced materials
Interface fracture
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Summary:A new approach is proposed for measuring the J integral (and thus the fracture resistance) of interface cracks in multiply laminates. With this approach the J integral is found from beam curvatures and applied moments. Knowledge of ply layup and stiffness is not required. In order to test the accuracy of the proposed approach, double cantilever beam specimen loaded with uneven bending moments (DCB-UBM) specimens were tested and analysed using the curvature approach and a method based on laminate beam theory. Beam curvatures were determined using a configuration of strain gauges. Good agreement was obtained between the two approaches.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
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content type line 23
ISSN:0013-7944
1873-7315
DOI:10.1016/j.engfracmech.2012.06.017