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Traction-displacement relationship defining the cohesive zone model in normal (n) and shear modes (t, s). Note that Ti are the tractions, σic are the critical strengths, δi are the crack opening displacements, and δiu are the ultimate values of the crack opening displacements (i = n, t and s). (b) Tetrahedral solid elements and the compatible wedge shaped cohesive element with six nodes.
