Over the last few years, adhesive lap joints have been used in Civil Engineering in conjunction with the structural application of Fiber Reinforced Polymers (FRP). Such applications mainly include the restoration of existing structures, usually made of concrete or masonry, while a minor part concern the field of new structures made from FRP. The behaviour of adhesive joints depends on many factors, such as the physical and mechanical properties of adherents and adhesive, as well as the joint configuration (the thickness of the adhesive layer, the length of the overlapping area, the curvature radius, etc.). A literature review of the most recent contributions given in this research field is summarized in [1], where, in addition to classical stress analysis approaches, is presented the modelling of the adherents/adhesive interfaces by cohesive laws. Such laws can be expressed by two uncoupled relations: the normal interaction, , versus the transverse relative displacement, , and the tangential interaction, , versus the axial relative displacement, , evaluated at the interface. The fracture energies relative to mode I (opening) and mode II (sliding) are activated by the displacements and , respectively. Current literature includes several significant papers which have mainly focused on mode II fracture [2-3]. The interest in mode II fracture is due to the fact that joints are designed to essentially transfer axial forces. Nevertheless, the additional presence of shear and flexural stresses, also mobilised by the curvature radius, even if less relevant in respect to the axial stresses, justifies the interest towards more refined approaches accounting for mixed mode I/II fracture [4-11]. The present paper aims at developing a wide analysis of the mixed fracture mode I/II applied to curved adhesive joints. The numerical results are presented as function of many parameters relative to: the mode I/II fracture energies ratio, the curvature radius, the stiffness of the reinforcement in comparison to that one of the support. The numerical results are compared with some others available in literature.

MECHANICAL BEHAVIOUR OF ADHESIVE JOINTS: THE INFLUENCE OF CURVATURE RADIUS

ASCIONE, FRANCESCO;MANCUSI, Geminiano
2012-01-01

Abstract

Over the last few years, adhesive lap joints have been used in Civil Engineering in conjunction with the structural application of Fiber Reinforced Polymers (FRP). Such applications mainly include the restoration of existing structures, usually made of concrete or masonry, while a minor part concern the field of new structures made from FRP. The behaviour of adhesive joints depends on many factors, such as the physical and mechanical properties of adherents and adhesive, as well as the joint configuration (the thickness of the adhesive layer, the length of the overlapping area, the curvature radius, etc.). A literature review of the most recent contributions given in this research field is summarized in [1], where, in addition to classical stress analysis approaches, is presented the modelling of the adherents/adhesive interfaces by cohesive laws. Such laws can be expressed by two uncoupled relations: the normal interaction, , versus the transverse relative displacement, , and the tangential interaction, , versus the axial relative displacement, , evaluated at the interface. The fracture energies relative to mode I (opening) and mode II (sliding) are activated by the displacements and , respectively. Current literature includes several significant papers which have mainly focused on mode II fracture [2-3]. The interest in mode II fracture is due to the fact that joints are designed to essentially transfer axial forces. Nevertheless, the additional presence of shear and flexural stresses, also mobilised by the curvature radius, even if less relevant in respect to the axial stresses, justifies the interest towards more refined approaches accounting for mixed mode I/II fracture [4-11]. The present paper aims at developing a wide analysis of the mixed fracture mode I/II applied to curved adhesive joints. The numerical results are presented as function of many parameters relative to: the mode I/II fracture energies ratio, the curvature radius, the stiffness of the reinforcement in comparison to that one of the support. The numerical results are compared with some others available in literature.
2012
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11386/3679277
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