The impact resistance of CTBN- modified epoxy adhesive joints

J. Lataillade , D. Grapotte , F. Cayssials

The wide use of structural adhesives by cars'manufacturers, lays down the problem of the impact resistance of a rubber-modified epoxy-bonded steel joint. An experimental device, which allows us to reach high strain rates under different failures modes (mode I, mode II, mode I+II) and under different temperature conditions, has been developed. To allow the use of fracture mechanics, to study the substrate influence, adhesive specimens have been realized with an interfacial defect. The microstructure analysis of adhesive joints, using thermal characterization and infra-red-spectroscopy, have shown differences between joint thicknesses and between joint cures schedules, due to the hardening and phase separation processes. These morphological differences are immediately followed by modifications in energy release rate results. There is cause to believe that this phenomenon is due to the relationships between structure and mechanical properties.

Domaines: Articles anciens

J. Lataillade, D. Grapotte, F. Cayssials. The impact resistance of CTBN- modified epoxy adhesive joints. Journal de Physique IV Proceedings, 1994, 04 (C8), pp.C8-771-C8-776. ⟨10.1051/jp4:19948119⟩. ⟨jpa-00253361⟩