Determination of Creep Behaviour of Adhesively Bonded Assembly - Application to Adhesively Bonded Steel Fasteners

Loiseau M., Chaitaigner S., Creac'hcadec R., Sourisseau Q., Quemere M., Court J., ...More

10th International Conference on Fibre-Reinforced Polymer (FRP) Composites in Civil Engineering (CICE), İstanbul, Turkey, 8 - 10 December 2021, vol.198, pp.2365-2377 identifier identifier

  • Publication Type: Conference Paper / Full Text
  • Volume: 198
  • Doi Number: 10.1007/978-3-030-88166-5_205
  • City: İstanbul
  • Country: Turkey
  • Page Numbers: pp.2365-2377
  • Keywords: Adhesively bonded connections, Creep behaviour, Experimental investigations, Modelling
  • Istanbul Technical University Affiliated: No


The use of adhesively bonded assembly is clearly justified for the case of all-FRP structures. Yet, there are still some issues related to the appraisal of the durability for such assembly. This article presents some investigations led on adhesively bonded connections in the case of steel fasteners bonded to steel plate. The studied solution was developed by Cold Pad to propose alternative assembly to welding or bolting (Fig. 1). This allows avoiding heavy on-site operations and is particularly well adapted to applications requiring cold working. In addition, it prevents from local steel material fragilization, residual stresses creation, or geometrical stress concentration that may decrease the structure's life expectancy. The understanding of creep behavior may help in a greater appraisal of long-term behavior of bonded solutions in other cases, such as all-FRP structures for instance. To be able to investigate the creep behavior of the developed solution, both experimental and numerical investigations were carried out. The experimental investigations were led on real scale assembly, at different stress levels, and under different load situations. The fastener may indeed be submitted to either predominant tension load, or shear load. These investigations led at different load levels allowed obtaining failure modes, repeatability, time to failure data, but also, local displacements evolution with time. The results revealed a non-linear evolution of those displacements closed to a Burger law. This model was thus chosen, and an analytical determination of creep parameters was realized. This was compared to finite element investigations to verify the adequacy of the proposed methodology. The good suitability of the modelling approach is demonstrated, and the dependency of the parameters with stress level is highlighted. In addition, the finite element investigations allow giving insight of internal stresses evolution during creep.