engleski

Numeričke simulacije udara u napredne konstrukcije s primjenom u obrani

Several numerical techniques applicable in defence applications, developed within research at the Project Laboratory for Numerical Modelling of Damage in Aeronautical Structures, are presented in this talk. The structural response and failure processes in the high-strain rate loadings, which are generated in certain loading conditions e.g. in the high and low velocity impact, ballistic impact and the blast loading, significantly differ from the static failure modes/structural response. The numerical simulation of impact damage has to address several problems as to achieve reliable results. One of the obstacles is the occurrence of extreme deformations in high-velocity impact conditions. This problem has been solved by the application of the Coupled Eulerian-Lagrangian (CEL) technique as to simulate the soft-body impact at the bird-strike on aeronautical structures [1]. The EOS material models have been employed as to model the pressure loads generated during the impact in these simulations realistically. In recent research, the multiscale methodology has been applied for modelling of impact damage at laminated composite structures. The methodology is based on the HFGMC micromechanical model [2, 3], whereas damage in the composite material has been modelled using the MMCDM damage model [4]. The methodology is intended to be used in advanced materials, e.g. self-healing materials, where the heterogeneous microstructure of the material directly affects the structural response and failure modes at the structural scale. Furthermore, high strain rates have a different impact on the different constituents in the heterogeneous material. Consequently, application of multiscale methods at high-velocity impact problems in advanced structures enables constituent-level modelling of strain rate effects at the structural scale. Numerical simulations of ballistic perforation of steel plates and similar crashworthiness applications have been also in the focus of recent research activities.

impact damage; composite structures; perforation; crashworthiness; micromechanics

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