Mechanics of zero degree peel test on a tape — effects of large deformation, material nonlinearity, and finite bond length

Self-strengthening tape junctions inspired by recluse spider webs

“…Past research on similar lap-shear or zero-degree peeling cases has described a critical force threshold where the two tapes effectively peel apart at a force lower than the tensile limit of the tape. 5,28,29 For the first time, we have shown that the optimization of f can produce adhesive junctions that are stronger than the tapes themselves.…”

“…26,27 However, even in the zero-degree case where the force acts parallel to the substrate and the tape behaves as a lap shear joint, this strength enhancement is limited by a critical peel force where the lap shear joint breaks down due to the viscoelastic properties of the adhesive layer and begins to peel. 5,28,29 A natural, tape-based materials system that does not exhibit the weakness associated with peeling is the recluse spider's sticky tape silk 30,31 seen in Fig. 1.…”

“…26,27 However, even in the zero-degree case where the force acts parallel to the substrate and the tape behaves as a lap shear joint, this strength enhancement is limited by a critical peel force where the lap shear joint breaks down due to the viscoelastic properties of the adhesive layer and begins to peel. 5,28,29…”

Understanding the role of crosslink density and linear viscoelasticity on the shear failure of pressure-sensitive-adhesives

“…22 Hui et al and Liu et al outlined a non-linearly elastic model to demonstrate that, within the load transfer length, the lateral stress is much larger than the shear stress and the hydrostatic pressure potentially sufficient to induce cavity nucleation and growth. 23,24 And finally, Guo et al introduced a non-linearly viscoelastic model to illustrate that strain energy dissipation ahead of the peel front can drastically mitigate stress concentrations and delay shear failure by, for example, viscoelastic creep. 25,28…”

Stick-slip phenomena and Schallamach waves captured using reversible cohesive elements

“…Nonetheless, it has been shown that the high load bearing capabilities observed across species (Labonte et al, 2016) can be matched without hierarchical features, by tuning the in-plane compliance of the layer (Bartlett et al, 2012). This was achieved with adhesive systems composed of a soft adhesive layer with a stiff backing (Jagota and Hui, 2011;Risan et al, 2015;Liu et al, 2019). Considering bi-layer adhesive systems, a recent study has shown that different failure modes may appear, including the formation of an interfacial cavity near the pulling end, or the propagation of a peeling front from the opposite end, which is referred to as curling, as it is associated with bending deformation of the far region (Cohen et al, 2018).…”