Abstract The paper is aimed at developing numerical models for simulation of hypervelocity collisions of small fragments with honeycomb shields relevant to Space structures protection from impact of debris fragments. Numerical modelling of hypervelocity collision within hydrodynamic approach reveals effects that are inconsistent with physical sense. In order to overcome these inconsistencies and to achieve justified description of the process of penetration and fracturing numerical model was developed assuming the impactor and projectile being viscous materials. Despite constant viscosity we investigate two phenomenological relationships for viscosity: depending on temperature and depending on deformation rate. The exponential dependence of viscosity on material state (temperature and second invariant of strain rate deviator) makes the material manifest both properties of fluid and solid state of matter. Taking into account viscosity allows to suppress jets at symmetry axis and small-scaled ejecta. The usage of non-constant viscosity results in a more physically based scenarios for fracturing of the shell obtained in numerical simulations.
Highlights A new numerical models for simulation of hypervelocity collisions is suggested. A model was developed assuming the impactor and projectile being viscous materials. Relationships for viscosity depending on temperature and deformation rate were used. The model makes the material manifest both properties of fluid and solid state. Realistic scenarios for fracturing of the shell were obtained in simulations.
Numerical modelling of high velocity impact problem involving non-linear viscosity
Acta Astronautica ; 212 ; 398-407
2023-08-17
10 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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