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We present a simple and robust implementation of the phase field fracturemethod in Abaqus. Unlike previous works, only a user material (UMAT) subroutineis used. This is achieved by exploiting the analogy between the phase fieldbalance equation and heat transfer, which avoids the need for a user elementmesh and enables taking advantage of Abaqus' in-built features. A unifiedtheoretical framework and its implementation are presented, suitable for anyarbitrary choice of crack density function and fracture driving force.Specifically, the framework is exemplified with the so-called AT1, AT2 andphase field-cohesive zone models (PF-CZM). Both staggered and monolithicsolution schemes are handled. We demonstrate the potential and robustness ofthis new implementation by addressing several paradigmatic 2D and 3D boundaryvalue problems. The numerical examples show how the current implementation canbe used to reproduce numerical and experimental results from the literature,and efficiently capture advanced features such as complex crack trajectories,crack nucleation from arbitrary sites and contact problems. The code developedcan be downloaded from www.empaneda.com/codes.

A unified Abaqus implementation of the phase field fracture method using only a user material subroutine