Local Interface Shear Fracture of Bonded Steel Joints with Various Bondline Thicknesses |
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Authors: | G Ji Z Ouyang G Li |
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Institution: | (1) Department of Mechanical Engineering, Louisiana State University, Baton Rouge, LA 70803, USA;(2) Department of Mechanical Engineering, Southern University and A&M College, Baton Rouge, LA 70813, USA; |
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Abstract: | Interfacial fracture is a critical issue for extensive applications of adhesively bonded structures to a variety of modern
industries. Extensive global experimental tests have been conducted to measure the global behavior of adhesively bonded joint,
such as ultimate load capacity and toughness. Recently, several studies have also been employed to characterize the local
interfacial traction–separation laws. However, very few tests have investigated the dependency of the local interfacial constitutive
laws on the adhesive thickness, particularly, under Mode-II loading conditions. In this work, six typical adhesive thicknesses
(from 0.1 mm to 1.0 mm) are prepared for the bonded joints with a configuration of end notched flexure (ENF) specimen to realize
the Mode-II fracture loading (shear fracture). With a recently developed analytical model, the global energy release rates
of the ENF specimens are experimentally measured. Meanwhile, with the image analysis technique, the local slips between the
two adherends are obtained. Finally, based on the J-integral theory, the local interfacial constitutive laws at different bondline thicknesses are obtained. Several experimental
findings are reported in this work. This work may provide valuable baseline experimental data for the input in cohesive zone
model (CZM) based analytical and numerical simulations. |
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