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Numerical and experimental investigation of the shock and steady state pressures in the bird material during bird strike

Frederik Allaeys (UGent) , Geert Luyckx (UGent) , Wim Van Paepegem (UGent) and Joris Degrieck (UGent)
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Abstract
The impact of a bird on a structure can, in the first place, be characterized by the pressure exerted on that structure. In bird strike research, the first step towards bird strike modelling is therefore often the investigation of these impact pressures. During impact, two subsequent regimes can be distinguished: a shock and steady state regime. These regimes are characterized by an initially very high shock pressure and a much lower steady state pressure. How relevant the shock regime is during bird strike however can still be questioned. This paper will reveal some key parameters that influence the shock regime, based on the conclusions of several SPH simulations and an experimental test campaign. A zoom on the numerically obtained shock pressure pulse is made, which shows that the impact pressure and duration correspond very well with the theory. Slight tilting of the projectile however can increase the pressure up to 190% of the analytical value. The elastic energy as a measure for the presence of the shock regime is introduced. This shows that the shock regime is relatively negligible for hemispherical ends. The steady state pressures obtained from the simulations are investigated and finally, the analytical values and numerical results are compared to a series of experimental impact pressure measurements with real and (porous) gelatine birds. (C) 2017 Elsevier Ltd. All rights reserved
Keywords
SIMULATION, GEOMETRY, IMPACT, MODEL, Numerical simulations, Experiments, Bird strike, Shock regime, Steady, state regime

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Chicago
Allaeys, Frederik, Geert Luyckx, Wim Van Paepegem, and Joris Degrieck. 2017. “Numerical and Experimental Investigation of the Shock and Steady State Pressures in the Bird Material During Bird Strike.” International Journal of Impact Engineering 107: 12–22.
APA
Allaeys, F., Luyckx, G., Van Paepegem, W., & Degrieck, J. (2017). Numerical and experimental investigation of the shock and steady state pressures in the bird material during bird strike. INTERNATIONAL JOURNAL OF IMPACT ENGINEERING, 107, 12–22.
Vancouver
1.
Allaeys F, Luyckx G, Van Paepegem W, Degrieck J. Numerical and experimental investigation of the shock and steady state pressures in the bird material during bird strike. INTERNATIONAL JOURNAL OF IMPACT ENGINEERING. Oxford: Pergamon-elsevier Science Ltd; 2017;107:12–22.
MLA
Allaeys, Frederik, Geert Luyckx, Wim Van Paepegem, et al. “Numerical and Experimental Investigation of the Shock and Steady State Pressures in the Bird Material During Bird Strike.” INTERNATIONAL JOURNAL OF IMPACT ENGINEERING 107 (2017): 12–22. Print.
@article{8533606,
  abstract     = {The impact of a bird on a structure can, in the first place, be characterized by the pressure exerted on that structure. In bird strike research, the first step towards bird strike modelling is therefore often the investigation of these impact pressures. During impact, two subsequent regimes can be distinguished: a shock and steady state regime. These regimes are characterized by an initially very high shock pressure and a much lower steady state pressure. How relevant the shock regime is during bird strike however can still be questioned. This paper will reveal some key parameters that influence the shock regime, based on the conclusions of several SPH simulations and an experimental test campaign. A zoom on the numerically obtained shock pressure pulse is made, which shows that the impact pressure and duration correspond very well with the theory. Slight tilting of the projectile however can increase the pressure up to 190\% of the analytical value. The elastic energy as a measure for the presence of the shock regime is introduced. This shows that the shock regime is relatively negligible for hemispherical ends. The steady state pressures obtained from the simulations are investigated and finally, the analytical values and numerical results are compared to a series of experimental impact pressure measurements with real and (porous) gelatine birds. (C) 2017 Elsevier Ltd. All rights reserved},
  author       = {Allaeys, Frederik and Luyckx, Geert and Van Paepegem, Wim and Degrieck, Joris},
  issn         = {0734-743X},
  journal      = {INTERNATIONAL JOURNAL OF IMPACT ENGINEERING},
  keyword      = {SIMULATION,GEOMETRY,IMPACT,MODEL,Numerical simulations,Experiments,Bird strike,Shock regime,Steady,state regime},
  language     = {eng},
  pages        = {12--22},
  publisher    = {Pergamon-elsevier Science Ltd},
  title        = {Numerical and experimental investigation of the shock and steady state pressures in the bird material during bird strike},
  url          = {http://dx.doi.org/10.1016/j.ijimpeng.2017.05.006},
  volume       = {107},
  year         = {2017},
}

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