Use of equivalent interface samples during fracture mechanics investigations for the design of adhesively bonded composite reinforcements on steel structures
Résumé
During an international Joint Industry Project called SBO (Strength Bond Offshore), a design strategy of adhesively bonded composite reinforcements for steel structures was developed and assessed. It relied on the use of fracture mechanics. Yet, an adaptation of the characterization tests was needed to reduce the number of samples while remaining representative of the studied reinforcement. This adaptation was called “equivalent interface samples”. This paper aims at presenting the proposed adaptation of fracture mechanics tests for mode I, mode II and mixed mode, and its use during the design strategy. First, the geometry of the samples will be presented. Then, the obtained results during the fracture mechanics experimental campaign will be introduced. Those investigations relied on the use distributed optical fiber sensor to monitor the crack propagation during the tests. The obtained toughness characterizations allowed us proposing a design strategy that was assessed in regards with experimental tests conducted on large size steel samples reinforced with adhesively bonded composite.
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