Abstract
A numerical procedure for estimating the critical dynamic energy release rate (\(G_{IDc}\)), based on experimental data is proposed. A generation phase simulation is conducted where fracture parameters can be determined using an experimentally measured crack propagation history (position of the crack tip as a function of time). The discrete element method is used to simulate the dynamic fracture by implementing a node release technique at the crack tip. The results are compared with analytical data on the dynamic propagation of a crack in a semi infinite plate. It reveals that the node release technique causes dynamic instabilities that can only be corrected by adding numerical damping on the edges of the crack or in the entire sample. On the other hand, the progressive node release technique, based on an elasto-damage zone model does not generate dynamic instabilities. It is shown that for a linear relaxation scheme and a damage zone length equal to the mean radius of the discrete elements, results comparable to finite element or analytical methods are obtained in plate structure. The present model offers an alternative to the finite element method to simulate self-similar or more complex crack growth. It also gives a first proper analysis of the evaluation of the critical dynamic energy release rate in a lattice-discrete model.
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Acknowledgements
This work was carried out in the frame of the FUI project SAMBA funded by BPI, région Midi-Pyrénées, région Aquitaine and approved by the Aerospace Valley. The SAMBA project, (for Shock Absorber Material for Birdshield Application), backed by STELIA Design and Research Division, concerns the development of new generation bird impact shields for commercial and business aircraft. The authors gratefully acknowledge the members of the project: STELIA (AirbusGroup), CEDREM, ESTEVE, NIMITECH, HUTCHINSON, Institut Clément Ader and ATECA SAS. The authors would also like to show their gratitude to Christophe Fond, Professor at the University of Strasbourg for sharing his expertise on dynamic fracture.
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Part of this work was presented at the Fifth International Conference on Computational Modeling of Fracture and Failure of Materials and Structures (2017) in Nantes, France.
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Appendix: Elastic calibration
Appendix: Elastic calibration
The first step in the elastic calibration is to ensure that the discrete meshing is fine enough to retrieve the macroscopic elastic properties obtained experimentally. The numerical convergence is assumed when the macroscopic parameters such as Young’s modulus and the Poisson ratio converge to one value, Fig. 17. To achieve this convergence, several discrete cylindrical domains from 500 to 35,000 elements were created, see in Fig. 16. Each of them was generated five times in order to use the average for each discrete domain refinement and to quantify the dispersion.
A numerical compressive test on each specimen is then performed. A load force is imposed on each side of the cylinder (on each center of elements belonging respectively to the top and bottom set of the cylinder), progressively applied and stabilized. Only elastic properties of the model are investigated so plates are not simulated and friction between the plates and the cylinder is not considered. The rate of loading forces is chosen to ensure a quasi-static solicitation and therefore to have a negligible kinetic energy compared to the total energy. Young’s macroscopic modulus and the Poisson ratio are estimated knowing the force applied at the top and bottom and the change in length and radius of the cylinder. According to the two top charts in Fig. 17, a discrete element number greater than 15,000 is found to converge: Young’s modulus and Poisson ratio values are within ±2.5 %. Microscopic parameters are scanned, interpolated and finally selected, see the two bottom charts in Fig. 17 and Table 2.
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Coré, A., Kopp, JB., Girardot, J. et al. Dynamic energy release rate evaluation of rapid crack propagation in discrete element analysis. Int J Fract 214, 17–28 (2018). https://doi.org/10.1007/s10704-018-0314-7
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DOI: https://doi.org/10.1007/s10704-018-0314-7