SEDL / STP / STP1357-EB / STP15843S

Hygrothermal Effects on Failure Mechanisms of Composite/Steel Bonded Joints

Roy, A
Research Manager, CRITT Matériaux, Rochefort,

Gontcharova-Bénard, E
Ph.D. Student and Chargé de Recherches au CNRS, Laboratoire de Mécanique et Physique des Matériaux, ENSMA, Site du Futuroscope, Futuroscope,

Gacougnolle, J-L
Ph.D. Student and Chargé de Recherches au CNRS, Laboratoire de Mécanique et Physique des Matériaux, ENSMA, Site du Futuroscope, Futuroscope,

Davies, P
Senior Research Engineer, IFREMER, Laboratoire des Matériaux Marins, Centre de Brest, Plouzané,

Pages: 19    Published: Jan 2000

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Abstract

The aging in water of steel/composite glass polyester specimens bonded with an epoxy adhesive has been studied at 25° and 40°C. The damage processes are controlled by water diffusion. The main damage is due to the adhesive swelling but, when specimens are loaded during immersion, the stress gradient at the extremities of the joint accelerates the water diffusion and then the failure of specimens. A simple logarithmic relationship between the specimen life time and the applied load makes easy the life prediction.