Peridynamics is a nonlocal extension of classical solid me chanics that allows for the modeling of bodies in which discon tinuities occur spontaneously. Because the peridynamic expres sion for the balance of linear momentum does not contain spa tial derivatives and is instead based on an integral equation, it is well suited for modeling phenomena involving spatial dis continuities such as crack formation and fracture. In this study, both peridynamics and classical finite element analysis are ap plied to simulate material response under dynamic blast loading conditions. A combined approach is utilized in which the por tion of the simulation modeled with peridynamics interacts with the finite element portion of the model via a contact algorithm. The peridynamic portion of the analysis utilizes an elastic-plastic constitutive model with linear hardening. The peridynamic inter face to the constitutive model is based on the calculation of an approximate deformation gradient, requiring the suppression of possible zero-energy modes. The classical finite element portion of the model utilizes a Johnson-Cook constitutive model. Simula tion results are validated by direct comparison to expanding tube experiments. The coupled modeling approach successfully cap tures material response at the surface of the tube and the emerg ing fracture pattern.
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