Paper number 769


X. J. Gong, F. Hernandez, G. Verchery

ISAT - Institut Supérieur de l'Automobile et des Transports
LRMA - Laboratoire de Recherche en Mécanique et Acoustique
49, Rue Mademoiselle Bourgeois - BP31, 58027 Nevers Cedex, France.

Summary This paper presents a study of the behaviour of different adhesive bonded composite joints. Based on linear elastic fracture mechanics, the concept of the total critical strain energy release rate is used to characterise the resistance to crack initiation of the adhesive bonded joint under mixed-mode loading. In order to investigate the effect of the nature of composite laminates on adhesive fracture toughness, the adhesive bonded joints of UD carbon/ epoxy on UD carbon/epoxy, 0/90 glass/epoxy on steel and +45/-45 glass/epoxy on steel were tested. Three tests were made to obtain the mixed mode ratio, in terms of GII/GTC , from 0 to 100% : DCB in mode I loading, ENF and ELS in mode II loading and IDCB in mixed mode I+II loading. Closed form models based on beam theory were for mode partitioning and for determination of the total critical strain energy release rate. A mixed-mode failure criterion was applied to predict the crack initiation of adhesive bonded joints.
Keywords adhesive bonded joints, testing methods, fracture toughness, mixed-mode.

Theme : Joints ; Bonded joints

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