Abstract
The comparison of two numerical methods based on the discontinuum model, i.e. the discrete element method (DEM) and the combined finite and discrete element method (FEM/DEM), is carried out through simulating the dynamic fracture of glass subjected to hard body impact. The purpose is to investigate the inherent drawbacks and advantages of these two methods for 2D problems. The glass beam is modeled in the plane stress fashion to observe the crack pattern in the thickness direction. The parallel bond model and the discrete crack model are employed in DEM and FEM/DEM respectively to model the fracture occurrence and propagation. Results reveal that the crack patterns show high consistency from both methods and agree well with prediction and the typical crack patterns such as cone, lateral and penetration cracks can be reproduced satisfactorily. However, the evolution of kinetic energy variation, indicating the trend of energy dissipation, shows significant discrepancy. This is due to the need of parameter calibration in DEM, which is difficult to measure from the material samples, resulting in a high sensitivity of energy releasing rate associated with the crack growth.
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Wang, X., Yang, J., Wang, T., Xiong, W. (2017). Evaluation of DEM and FEM/DEM in Modeling the Fracture Process of Glass Under Hard-Body Impact. In: Li, X., Feng, Y., Mustoe, G. (eds) Proceedings of the 7th International Conference on Discrete Element Methods. DEM 2016. Springer Proceedings in Physics, vol 188. Springer, Singapore. https://doi.org/10.1007/978-981-10-1926-5_40
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DOI: https://doi.org/10.1007/978-981-10-1926-5_40
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