Influence of Low Temperature Cycles on the Ultrasonic Behaviour of Pretreated 2024 T3 Aluminium Joints
Many authors have considered the problem of adhesive bond durability over a long period of time or under special environmental conditions, and all have concluded that surface preparation is of paramount importance. Here, 2024 T3 aluminium alloy bonded joints, whose metallic plates underwent phosphoric acid pretreatment prior to bonding, are investigated before and after exposure to −40°C for 67 hours. This procedure of ageing is repeated several times and the samples are examined, after each cycle by ultrasonic eigen modes of the trilayer (called Lamb waves in order to traduce the guided form of theses modes). In particular, the position of the cutoff-frequencies of ultrasonic guided waves which propagate into the bonded structure allows us to calculate the stiffnesses of the metal/adhesive interfaces via a rheological model. Thus, after exposure, a progressive decrease in the value of the stiffnesses is observed even for pretreated surfaces.
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Document Type: Research Article
Publication date: 2010-01-01
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- Acta Acustica united with Acustica, published together with the European Acoustics Association (EAA), is an international, peer-reviewed journal on acoustics. It publishes original articles on all subjects in the field of acoustics, such as general linear acoustics, nonlinear acoustics, macrosonics, flow acoustics, atmospheric sound, underwater sound, ultrasonics, physical acoustics, structural acoustics, noise control, active control, environmental noise, building acoustics, room acoustics, acoustic materials, acoustic signal processing, computational and numerical acoustics, hearing, audiology and psychoacoustics, speech, musical acoustics, electroacoustics, auditory quality of systems. It reports on original scientific research in acoustics and on engineering applications. The journal considers scientific papers, technical and applied papers, book reviews, short communications, doctoral thesis abstracts, etc. In irregular intervals also special issues and review articles are published.
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