Abstract
This article presents a numerical model coupling the finite difference method and discrete element methods (FDM, DEM) for simulating the response of cellular geostructures to impacts. DEM is used in the vicinity of the impacted area while FDM is used far away. The continuity between the DEM and FDM domains is insured using the edge-to-edge method. The numerical parameters are calibrated based on compression and impact experiments conducted on elementary cells. Numerical simulations at the structure scale are compared with real-scale experimental data. The response of the structure is addressed varying the impact conditions. The projectile shape and the position of the impact point appear to be the most influential parameters.
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Abbreviations
- α :
-
Discrete/continuous domains coupling coefficient
- β :
-
Continuous/discrete domains coupling coefficient
- \(C_{u/l}\) :
-
Ratio between unloading and loading stiffness of wire elements
- \({\mathbf{d}}_{{\mathbf{j}}}\) :
-
Displacement of particle j
- \({\mathbf{\textit{\"{d}}}}_{{\mathbf{j}}}\) :
-
Acceleration of particle j
- DEM:
-
Discrete element method
- D r :
-
Relative density
- E :
-
Young’s modulus
- E t :
-
Wire mesh tensile modulus
- FDM:
-
Finite difference method
- \({\mathbf{F}}_{{\mathbf{i}}}^{{{\mathbf{tot}}}}\) :
-
External forces on continuous element i
- \({\mathbf{F}}_{{\mathbf{j}}}^{{{\mathbf{tot}}}}\) :
-
External forces applied on particle j
- H:
-
Hamiltonian operator
- \({\mathbf{K}}\) :
-
Kinematic matrix
- \({\mathbf{k}}_{ik}\) :
-
Elementary kinematic matrix
- K l :
-
Tensile stiffness of wire elements
- k n :
-
Interparticles normal contact stiffness
- K n :
-
Constitutive material normal stiffness
- k s :
-
Interparticles tangential contact stiffness
- K s :
-
Constitutive material tangential stiffness
- K u :
-
Unloading stiffness of wire elements
- \({\varvec{\uplambda}}\) :
-
Lagrange multiplier coefficients
- \({\varvec{\Lambda}}\) :
-
Vector composed of the Lagrange multiplier coefficients
- µ :
-
Microscopic interparticle friction parameter
- \(m_{j}\) :
-
Mass of particle j
- \(M_{i}\) :
-
Mass of continuous element i
- \(R_{j}\) :
-
Radius of discrete particle j
- \({\mathbf{\textit{\"{u}}}}_{{\mathbf{i}}}\) :
-
Acceleration of the continuous element i
- \({\mathbf{u}}_{{\mathbf{i}}}\) :
-
Displacement of the continuous element i
- v :
-
Poisson ratio
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Acknowledgments
This research was completed within the framework of the REMPARe project, funded by the French National Research Agency (ANR). The authors would like to thank EGIS and Irstea for their contribution to setting up the instrumentation and conducting the experiments.
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Breugnot, A., Lambert, S., Villard, P. et al. A Discrete/continuous Coupled Approach for Modeling Impacts on Cellular Geostructures. Rock Mech Rock Eng 49, 1831–1848 (2016). https://doi.org/10.1007/s00603-015-0886-8
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DOI: https://doi.org/10.1007/s00603-015-0886-8