The Effects of Shear on Mode II Delamination

The paper focuses on the effects of shear deformation and shear forces on the mode II contribution to the energy release rate in delaminated beams. A critical review of the relevant literature is presented, starting from the end-notched flexure test as the prototype of delaminated laminates subjecte...

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Bibliographic Details
Published in:Frattura ed integritá strutturale 2018-04, Vol.12 (44), p.123-139
Main Author: Valvo, Paolo Sebastiano
Format: Article
Language:English
Subjects:
Beam theory
Beam theory (structures)
Crack tips
Deformation
Deformation effects
Delamination
End-notched flexure test
Energy
Energy release rate
Flexing
Laminates
Literature reviews
Mixed-mode fracture
Mode II fracture
Shear deformation
Shear modulus
Timoshenko beams
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Summary:The paper focuses on the effects of shear deformation and shear forces on the mode II contribution to the energy release rate in delaminated beams. A critical review of the relevant literature is presented, starting from the end-notched flexure test as the prototype of delaminated laminates subjected to pure mode II fracture. Several models of the literature are recalled from simple beam theory to more refined models. The role of first-order shear deformation in line with the Timoshenko beam theory is investigated as distinct from the local crack-tip deformation related to the shear modulus of the material. Then, attention is moved on to a general delaminated beam with an arbitrarily located through-the-width delamination, subjected to mixed-mode fracture. Several fracture mode partition methods of the literature are reviewed with specific attention on the effects of shear forces and shear deformation on the mode II contribution to the energy release rate.
ISSN:1971-8993
1971-8993
DOI:10.3221/IGF-ESIS.44.10