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We study optimal regularity and free boundary for minimizers of an energy functional arising in cohesive zone models for fracture mechanics. Under smoothness assumptions on the boundary conditions and on the fracture energy density, we show that minimizers are   C   1  ,  1  /  2    , and that near non-degenerate points the fracture set is   C   1  ,  α    , for some   α  ∈  (  0  ,  1  )   .

Optimal Regularity and Structure of the Free Boundary for Minimizers in Cohesive Zone Models