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Numerical modeling of impacts at high velocities by a meshfree method Smoothed particles Hydrodynamics. Application to micro-impacts in soft tissues

Abstract : Investigations on the ballistic behaviours of soft tissue materials are significant research in a medical and pharmaceutical framework. They mainly focus on particles penetrating or traveling into the soft materials. For instance, in the needle-free drug delivery, the micro-scale particles as drug powders are injected into skin with high velocity, and several factors should be considered such as the particle diameters, trajectories, and momentum or velocities of projectile in this process. There have been investigated by some experiments, but there is still no study from the numerical insights.The numerical methods are suitable to study these kinds of processes. Although grid-based methods like FEM have been powerful tools in engineering, the large distortions of elementsexist when solid structures are extremely deformed. The methods based on the particle modelling are very suitable for simulating phenomena like the high velocity impacts. As the earliest meshless method, Smoothed Particles Hydrodynamics (SPH) has been applied in solid dynamics because of its great potentials in simulating extremely large deformation and perforation of targets by various projectiles at high velocities. This thesis mainly studies the SPH method by developing a SPH code for solid dynamics, and then propose a numerical model based on SPH method to investigate the penetration process into soft tissues (gelatin and synthetic polymer SEBS gel (styrene-ethylene-butylene-styrene) considered as biofidelic soft tissue simulants) at micro-scale.
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Submitted on : Friday, July 16, 2021 - 4:05:20 PM
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  • HAL Id : tel-03289003, version 1

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Shuangshuang Meng. Numerical modeling of impacts at high velocities by a meshfree method Smoothed particles Hydrodynamics. Application to micro-impacts in soft tissues. Other. Université Bourgogne Franche-Comté, 2021. English. ⟨NNT : 2021UBFCA002⟩. ⟨tel-03289003⟩

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