Implementation of a coupled plastic damage distinct lattice spring model for dynamic crack propagation in geomaterials |
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| Authors: | Chao Jiang Gao‐Feng Zhao |
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| Institution: | 1. State Key Laboratory of Hydraulic Engineering Simulation and Safety, School of Civil Engineering, Tianjin University, Tianjin, China;2. School of Civil and Environmental Engineering, The University of New South Wales, Sydney, NSW, Australia |
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| Abstract: | This paper studies dynamic crack propagation by employing the distinct lattice spring model (DLSM) and 3‐dimensional (3D) printing technique. A damage‐plasticity model was developed and implemented in a 2D DLSM. Applicability of the damage‐plasticity DLSM was verified against analytical elastic solutions and experimental results for crack propagation. As a physical analogy, dynamic fracturing tests were conducted on 3D printed specimens using the split Hopkinson pressure bar. The dynamic stress intensity factors were recorded, and crack paths were captured by a high‐speed camera. A parametric study was conducted to find the influences of the parameters on cracking behaviors, including initial and peak fracture toughness, crack speed, and crack patterns. Finally, selection of parameters for the damage‐plasticity model was determined through the comparison of numerical predictions and the experimentally observed cracking features. |
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| Keywords: | 3D printing crack propagation damage‐plasticity model lattice spring model |
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