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Mode II fracture of bonding interface of GFRP laminates under 4-enf test

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Document pages: 10 pages

Abstract: The mode II fracture behavior of bonded joints composed of GFRP laminates was studied. A new beam model is proposed to calculate the type II err of GFRP bonded 4-enf specimens. In this model, the relative deflection angle between the upper and lower layers and the deformation of 4-enf specimen caused by the bending deformation of the upper and lower layers are introduced respectively; The effect of adhesive layer deformation on the mechanical properties of the material is analyzed. Based on the crack flexibility method, the analytical solutions of flexibility and energy release rate are obtained. Through the finite element analysis of bonded GFRP 4-enf specimens, and compared with rigid joint model and CBT model, the high accuracy of the existing analytical solutions is verified. Interfaceal crack propagation is numerically simulated using shear fracture toughness determined in this experiment, from which the predicted critical load results are in good agreement with the experimental results. The conclusion indicates that the compliance and ERR can accurately be predicted using the new bonded 4-ENF beam model.

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