SHEAR BEHAVIOUR OF STRUCTURAL ADHESIVES IN THE BONDLINE

Adhesives 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 (od = 70 mm, 5 mm wall thickness), were bonded with three adhesives of widely different properties. A bondline-thickness of 100 microns was controlled by a cylindrical spacer. Shear tests were performed at -40 deg C, 23 deg C, 80 deg C and 120 deg C. Shear strain in the bondline was recorded by means of a specially designed angular transducer of high resolution (better than 0.1 micron). The shear strength of the joints increased as the test temperature was lowered (135 mpa at -40 deg 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. (Author/TRRL)

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  • Corporate Authors:

    Scientific and Technical Press Limited

    Chilberton House, Doods Road
    Reigate, Surrey,   England 
  • Authors:
    • FISCHER, M
    • Pasquier, M
  • Publication Date: 1989-3

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Filing Info

  • Accession Number: 00492801
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • Files: ITRD, TRIS
  • Created Date: Mar 31 1990 12:00AM