DCB-specimen loaded with uneven bending moments |
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Authors: | Bent F Sørensen Kenneth Jørgensen Torben K Jacobsen Rasmus C Østergaard |
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Affiliation: | 1. Materials Research Department, Ris? National Laboratory, P.O. Box 49, Frederiksborgvej, DK-4000, Roskilde, Denmark 2. LM Glasfiber, Rolles M?llevej 1, DK-6640, Luderskov, Denmark
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Abstract: | A double cantilever beam specimen loaded with uneven bending moments (DCB-UBM) is proposed for mixed mode fracture mechanics
characterisation of adhesive joints, laminates and multilayers. A linear elastic fracture mechanics analysis gives the energy
release rate and mode mixity analytically for both isotropic and orthotropic materials. By varying the ratio between the two
applied moments, the crack tip stress state can be varied from pure mode I to pure mode II for the same specimen geometry.
The specimen allows stable crack growth. A special test fixture is developed to create uneven bending moments. As a preliminary
example, the DCB-UBM specimen was used for characterising fracture of adhesive joints between two laminates of thermoset glass
fibre reinforced plastic. |
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Keywords: | Delamination Fracture Mixed mode J integral |
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