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Shear behaviour of structural adhesives in the bondline
AbstractAdhesives are frequently tested in lap-shear joints. Under load, however, even joints made of thick adherends are not free of bending deformations which influence the results of such tests. A state of simple shear is achieved in a butt-joint of coaxial hollow cylinders. Torsional shear experiments are suitable for the determination of shear moduli and stress-strain-diagrams of adhesives in the bondline.Aluminium cylinders (O.D. = 70 mm, 5 mm wall thickness), were bonded with three adhesives of widely different properties. A bondline-thickness of 100 μm was controlled by a cylindrical spacer. Shear tests were performed at −40°C, 23°C, 80°C and 120°C. Shear strain in the bondline was recorded by means of a specially designed angular transducer of high resolution (better than 0,1 m). The shear strength of the joints increased as the test temperature was lowered (135 MPa at −40°C.).Depending on the test temperature, the shear moduli of the bondline-materials are in the range from 2000 MPa at sub-zero temperatures down to 10 MPa at elevated temperatures. Visco-elasticity was observed as the temperature approached the Tg of the polymers. Shear moduli of the bulk adhesives are comparable with those measured in the bondline.
Shear behaviour of structural adhesives in the bondline
AbstractAdhesives are frequently tested in lap-shear joints. Under load, however, even joints made of thick adherends are not free of bending deformations which influence the results of such tests. A state of simple shear is achieved in a butt-joint of coaxial hollow cylinders. Torsional shear experiments are suitable for the determination of shear moduli and stress-strain-diagrams of adhesives in the bondline.Aluminium cylinders (O.D. = 70 mm, 5 mm wall thickness), were bonded with three adhesives of widely different properties. A bondline-thickness of 100 μm was controlled by a cylindrical spacer. Shear tests were performed at −40°C, 23°C, 80°C and 120°C. Shear strain in the bondline was recorded by means of a specially designed angular transducer of high resolution (better than 0,1 m). The shear strength of the joints increased as the test temperature was lowered (135 MPa at −40°C.).Depending on the test temperature, the shear moduli of the bondline-materials are in the range from 2000 MPa at sub-zero temperatures down to 10 MPa at elevated temperatures. Visco-elasticity was observed as the temperature approached the Tg of the polymers. Shear moduli of the bulk adhesives are comparable with those measured in the bondline.
Shear behaviour of structural adhesives in the bondline
Fischer, Michael (author) / Pasquier, Maurice (author)
Construction and Building Materials ; 3 ; 31-34
1989-01-01
4 pages
Article (Journal)
Electronic Resource
English
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