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arXiv · 2610.22888

Adaptive Crack-Tip Localization of Phase-Field Fracture Computations

Aarosh Dahal·Aditya Kumar
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Abstract

Phase-field models of fracture provide a unified framework for simulating crack nucleation and propagation, but their computational cost remains high because the governing equilibrium and phase-field equations are typically iteratively solved over the entire domain at every staggered iteration. We present an extension of the recently developed adaptive mesh refinement and coarsening framework that localizes not only spatial resolution but also repeated solution effort to a small active patch around the crack tip for linear elastic brittle materials. The inactive exterior is eliminated through a Schur complement and condensed onto the patch interface, and its factorization is reused as long as the patch remains fixed. The phase field is frozen in the exterior, introducing only a small approximation in the crack wake. The method is implemented in FEniCSx and evaluated for quasi-static crack propagation, dynamic crack branching, three-dimensional mixed-mode crack growth, and coalescence of multiple cracks in a unit cell. Across these problems, the condensed formulation reproduces the reference solutions with differences in global quantities below 0.5%, while substantially reducing the number of active degrees of freedom. In the quasi-static surfing problem, wall time speedups increase from 6.9 to 22.8 as the domain size is doubled, demonstrating increasing computational advantage for large-scale phase-field fracture simulations.

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Aarosh Dahal, Aditya Kumar. 2026-10-16. Adaptive Crack-Tip Localization of Phase-Field Fracture Computations. https://arxiv.org/abs/2610.22888

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