Crack-induced interfacial debonding

Figure 5.14 Bond failure modes of FRP-to-concrete joints (a) flexural crack-induced interfacial debonding (b) shear crack-induced interfacial debonding (c) end-zone interfacial debonding (d) end-zone interfacial debonding accompanied...

It should be noted that this model is based on the mechanics of idealised joints and the analysis of some experimental results of simple shear tests. Certain modifications may be necessary when the model is applied in the presence of cracking activity in the RC member since the stress state in the case of crack-induced interfacial debonding situation is different than the stress state assumed in the derivation of this model. 

The interfacial debond occurs after the through-thickness cracking of the films. It is activated by transverse contraction of the substrate which induces the buckling of the strips of the cracked films. The analysis of this particular adhesion failure mechanism provides insights concerning the interfacial strength of... 

A low velocity impact induces various types of damage in fiber reinforced laminated composite structures. In addition to the visible or barely visible indentation on the impacted surface and cracking on the back surface, the most prevalent damage inside a laminated composite includes delamination, matrix cracking, fiber/matrix interfacial debonding, and fiber fracture (see Figure 1.1) [3]. 

Galvanic corrosion may activate interfacial debonding between graphite fiber and polymers as well as induce internal fiber cracks (Gebhard et al. 2009). In different circumstances, it could corrode the metal. 

As long as the interfacial microstructure inhomogeneity remains, which is frequently the case in conventional concrete reinforced with fibres, a complex mode of cracking and debonding may be induced, as outlined below. 

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