NLMech: Implementation of finite difference/meshfree discretization of nonlocal fracture models

The open source code NLMech is an implementation of finite difference approximation of nonlocal models, e.g. peridynamic. Peridynamic (PD) (Silling et al., 2007; Silling & Askari, 2005) is a nonlocal formulation of classical continuum mechanics that is particularly robust in mechanical deformations involving crack (discontinuous displacement) and damage. The model seamlessly handles the two regimes of deformation: elastic/smooth deformation and fracture. The constitutive laws describing the material behavior are simple to conceptualize and implement. Particularly, in numerical implementation, no special care for the modeling of cracks is required. Successful comparison of PD against a variety of experiments has been done (Diehl et al., 2019, p. diehl2021comparative).

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