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DOE OSTI · 1769891

Inelastic peridynamic model for molecular crystal particles

Silling, Stewart A.·Barr, Christopher Michael·Cooper, Marcia A.·Lechman, Jeremy B.·Bufford, Daniel Charles
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Abstract

The peridynamic theory of solid mechanics is applied to modeling the deformation and fracture of micrometer-sized particles made of organic crystalline material. A new peridynamic material model is proposed to reproduce the elastic–plastic response, creep, and fracture that are observed in experiments. The model is implemented in a three-dimensional, meshless Lagrangian simulation code. In the small deformation, elastic regime, the model agrees well with classical Hertzian contact analysis for a sphere compressed between rigid plates. Under higher load, material and geometrical nonlinearity is predicted, leading to fracture. Finally, the material parameters for the energetic material CL-20 are evaluated from nanoindentation test data on the cyclic compression and failure of micrometer-sized grains.

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72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDSCreepEnergetic materialGranular mediumNanoindentationPeridynamicPlasticity

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Silling, Stewart A., Barr, Christopher Michael, Cooper, Marcia A., Lechman, Jeremy B., Bufford, Daniel Charles. 2021-02-22. Inelastic peridynamic model for molecular crystal particles. https://doi.org/10.1007/s40571-021-00389-y

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