On the influence of the shape of the interface law on the application of cohesive-zone models

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On cohesive element parameters and delamination modelling (2019, background): “Various cohesive laws, such as linear, polynomial, trapezoidal and exponential relations, have been proposed and applied in numerical simulations [9-13].”
Modelling adhesive joints with cohesive zone models: effect of the cohesive law shape of the adhesive layer (2013, background): “adhesives [8,25], and this is particularly critical when considering stiff adherends, due to the practically absence of differential deformation effects in these components along the overlap [23,26].”
Predicting fatigue damage in adhesively bonded joints using a cohesive zone model (2010, background): “The tripping traction (T) is related to the length of the process zone and to the tensile strength of the material and is difficult to measure experimentally [39].”
Finite element modeling of mode I delamination growth in laminated DCB specimens with R-curve effects (2013, unknown): “[9,10], Nairn [11], and Alfano [12] introduced various simplified forms of traction–separation laws such as linear elastic, rigid plastic or constant stress, linear softening, triangular or bilinear, trapezoidal and cubic forms.”