This talk addresses two topics related to modeling of quasi-brittle interfaces under mixed-mode loading conditions. The context in which the investigation is situated is the study of bond between fiber-reinforced polymer (FRP) sheets and quasi-brittle substrates, where FRP sheets are used as a strengthening system for existing structures. The first topic is the study of the interface between a rigid substrate and a thin elastic adherend subjected to mixed-mode loading in the peel test configuration. The second topic is the study of the interface between a rigid substrate with simple constant curvature and a thin bonded plate. These two problems are approached both analytically and numerically. The analytical models are based on linear-elastic fracture mechanics, as well as on the uncoupled cohesive-zone modeling approach. In the numerical model, the interface is discretized with zero-thickness contact elements which account for both debonding and contact within a unified framework. The interfacial behavior is modeled by independent cohesive laws in the normal and tangential directions, coupled with a mixed-mode fracture criterion. The models are able to predict the response of the bonded joint, including the debonding load, the effective bond length, and the detailed distributions of interfacial shear and normal stresses during the various behavioral stages of the interface prior to the initiation of debonding. Analytical and numerical results are presented and discussed.

Mixed mode debonding models for composite layers / Zavarise, G.; De Lorenzis, L.. - ELETTRONICO. - (2012). (Intervento presentato al convegno Workshop of the Italian Group of Fracture on "Virtual Testing of Materials and Structures" tenutosi a Torino nel 8 ottobre 2012).

Mixed mode debonding models for composite layers

Zavarise G.;
2012

Abstract

This talk addresses two topics related to modeling of quasi-brittle interfaces under mixed-mode loading conditions. The context in which the investigation is situated is the study of bond between fiber-reinforced polymer (FRP) sheets and quasi-brittle substrates, where FRP sheets are used as a strengthening system for existing structures. The first topic is the study of the interface between a rigid substrate and a thin elastic adherend subjected to mixed-mode loading in the peel test configuration. The second topic is the study of the interface between a rigid substrate with simple constant curvature and a thin bonded plate. These two problems are approached both analytically and numerically. The analytical models are based on linear-elastic fracture mechanics, as well as on the uncoupled cohesive-zone modeling approach. In the numerical model, the interface is discretized with zero-thickness contact elements which account for both debonding and contact within a unified framework. The interfacial behavior is modeled by independent cohesive laws in the normal and tangential directions, coupled with a mixed-mode fracture criterion. The models are able to predict the response of the bonded joint, including the debonding load, the effective bond length, and the detailed distributions of interfacial shear and normal stresses during the various behavioral stages of the interface prior to the initiation of debonding. Analytical and numerical results are presented and discussed.
File in questo prodotto:
Non ci sono file associati a questo prodotto.
Pubblicazioni consigliate

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11583/2706466
 Attenzione

Attenzione! I dati visualizzati non sono stati sottoposti a validazione da parte dell'ateneo