期刊
COMPUTATIONAL PARTICLE MECHANICS
卷 8, 期 5, 页码 1005-1017出版社
SPRINGER INT PUBL AG
DOI: 10.1007/s40571-021-00389-y
关键词
Peridynamic; Creep; Plasticity; Energetic material; Nanoindentation; Granular medium
资金
- U.S. Department of Energy's National Nuclear Security Administration [DE-NA0003525]
The study applies the Peridynamic theory to model the deformation and fracture of organic crystalline material particles, introducing a new material model implemented in a simulation code. Results show that the model can accurately simulate the elastic-plastic response and nonlinear fracture under different loads.
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. 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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