Faculté des Sciences appliquées
Faculté des Sciences appliquées

Master thesis and internship[BR]- Master's thesis : Towards a new constitutive model for gelatin impacts modelling[BR]- Integration Internship

Radermecker, Arnaud ULiège
Promotor(s) : Ponthot, Jean-Philippe ULiège
Date of defense : 27-Jun-2022/28-Jun-2022 • Permalink :
Title : Master thesis and internship[BR]- Master's thesis : Towards a new constitutive model for gelatin impacts modelling[BR]- Integration Internship
Translated title : [fr] Vers un nouveau modèle constitutif de la gélatine pour modéliser des impacts multiples
Author : Radermecker, Arnaud ULiège
Date of defense  : 27-Jun-2022/28-Jun-2022
Advisor(s) : Ponthot, Jean-Philippe ULiège
Committee's member(s) : Boman, Romain ULiège
Ruess, Jean-Sébastien 
Language : English
Number of pages : 109
Keywords : [fr] bird ingestion
[fr] gelatin modelling
[fr] constitutive model
[fr] smoothed-particule hydrodynamics
[fr] LS-DYNA
[fr] Safran Aero Boosters
Discipline(s) : Engineering, computing & technology > Aerospace & aeronautics engineering
Institution(s) : Université de Liège, Liège, Belgique
Degree: Master en ingénieur civil en aérospatiale, à finalité spécialisée en "aerospace engineering"
Faculty: Master thesis of the Faculté des Sciences appliquées


[en] A new constitutive model is proposed for ballistic gelatin, considered as a bird surrogate,
to simulate bird ingestion in new generation aircraft engines using LS–DYNA. The stress–
strain relation is an isotropic hyperelastic model with a Mooney–Rivlin strain energy
function and an uncoupled volumetric/deviatoric response. Gelatin quasi–incompressibility
is actually treated with a multiplicative decomposition of the deformation gradient. The
latter aims at to remove the hypothesis and limitations of the current hydrodynamics
model used. It considers gelatin as an actual solid instead of a fluid. Since this material
model does not exist natively in LS–DYNA, it is programmed in a user–material Fortran
subroutine as part of the software’s user–defined–features. The implementation is validated
by comparing simulation results with their analytical solutions. An influence study is
conducted on the material constants and on the parameters of the numerical method used:
the smoothed–particle hydrodynamics. The goal being to identify their effects on the
responses, stability, robustness, computation time, etc. A correlation with a real test is
performed, and the results are compared with the previous material model. This new
constitutive model presents interesting results, and offers a more physical response of the
gelatin on certain points compared to the hydrodynamics. Indeed, this material model
adds more cohesion in the material, which may enable a better representation of multiple
impacts simulations. However, a proper calibration and identification of its parameters are
still required



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  • Radermecker, Arnaud ULiège Université de Liège > Master ingé. civ. aérospat., à fin.


Committee's member(s)

  • Boman, Romain ULiège Université de Liège - ULiège > Département d'aérospatiale et mécanique > Département d'aérospatiale et mécanique
    ORBi View his publications on ORBi
  • Ruess, Jean-Sébastien
  • Total number of views 86
  • Total number of downloads 2

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