A variational phase-field theory of cohesive fracture at finite deformation

Ye Feng

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arXiv · 2610.41662

A variational phase-field theory of cohesive fracture at finite deformation

Ye Feng

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Abstract

This paper formulates a kinematically and variationally consistent phase-field theory for cohesive fracture at finite deformation. The theory introduces an independent compliance-damage field, which accommodates both diffuse distributions and singular concentrations. The phase-field is thereby freed from the dual burden of describing crack geometry and material degradation. A rank-one additive split of the deformation gradient makes separation explicit through independent crack-strain and reference-normal fields. All fields are governed by a single principle of minimum potential energy, which consistently couples nonlinear bulk deformation, crack separation, and crack-plane rotation. One-dimensional energy comparisons show that minimization favors Dirac-type concentration of compliance damage and crack strain. Strong displacement discontinuities thus emerge naturally at a finite phase-field length without being prescribed a priori, while the phase-field remains continuous. The concentrated energy recovers the exact bulk--interface structure of a sharp-crack cohesive zone model. General objective hyperelastic bulk potentials and admissible mixed-mode cohesive laws can therefore be prescribed independently, with the nominal traction--separation law unaffected by the bulk law or phase-field length. Diffuse damage can coexist with concentrated cracks, retaining deformation modes for bulk-energy relaxation during nucleation. Two- and three-dimensional examples validate the theory across large stretches, finite rotations, and complex crack paths. Notably, the computed near-tip Cauchy stress closely matches the analytical 1/r crack-tip asymptotic solution of Long et al. (2011) outside the cohesive zone.

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Ye Feng. 2026-10-30. A variational phase-field theory of cohesive fracture at finite deformation. https://arxiv.org/abs/2610.41662

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