Fig. 6. Mixed-mode fracture toughness sensitivity to elastic properties.
a Changes in the fracture toughness with different elastic properties. b Sensitivity to the elastic modulus of the weak layer Ewl ∈ [0.1, 1.0] MPa48. c Sensitivity to the exponent γ ∈ [3.5, 5.0]48 of the density parametrization of the elastic modulus of slab layers (6). d Sensitivity to the ratio of elastic and shear modulus of the weak layer Ewl/Gwl ∈ [2.0, 3.0] representing Poisson ratios ν ∈ [0.0, 0.5] between no lateral expansion and incompressibility, respectively.