How relevant are load rate effects to realistic bonded joints?

摘要

Adhesive bonded repairs have been a feature of RAAF maintenance practice since the first bonded composite patch was applied to C-130-A in May 1975. The Royal Australian Air Force has recently issued RAAF Engineering Standard C5033, on Bonded andComposite Repairs, with the design procedures for bonded repairs based largely on modeling the repair as a bonded joint. Efforts to obtain international acceptance of the fundamental -elements of the Standard have been highly successful.Analytical techniques have advanced significantly since the first practical repair, leading to a plethora of studies into a range of phenomenological issues of relevance to the performance of bonded repairs. Some of these studies have advocated that loadrate effects result in significant changes to the stress-strain behaviour of adhesive systems, and have even suggested that these effects are of fundamental importance to repair design methodology. This paper will show that although the phenomena reported does indeed occur under specific conditions, its relevance to practical repair designs is limited.