Weak adhesive junctions

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Abstract
Weak mechanical junctions can be found (1) at glass/rubber interfaces ; (2) between two rubber blocks with a few interblock crosslinks ; (3) between two glassy polymers A/B with a monolayer of AB copolymer ; (4) between two identical copolymers after partial interdiffusion. When a fracture propagates along such a junction, the dissipation tends to be localized in the junction region. We present a phenomenological description of this process in termes of two ingredients : (a) a threshold stress σc associated with chemical scission in cases (1, 2) and with plastic flow in cases (3, 4) ; (b) a « succion » process — with a succion velocity proportional to the local stress σ, — ending when the volume transfer (per unit area) has reached a certain limit hf. We restrict (for the moment) our attention to cases without cavitation (no crazes). From a very crude analysis of the mechanical behavior around the weak junction, we are led to expect two fracture regimes : (α) at low fracture velocities V, the process is quasi static and the fracture energy GIC scales like σc hf ; β) beyond a velocity V*, the length of the succion region is very much spread out, and GIC increases with V. But we have not yet built a precise mechanical analysis of our model

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