Računalniško modeliranje celičnih gradiv pod vplivom udarnih obremenitev : doktorska disertacija
Vesenjak, Matej
In this thesis new computational models for numerical analysis of closed- and open-cell cellular structures are presented. The aim of this research is to determine and evaluate the influence of ...different parameters on behaviour of cellular structures under uniaxial dynamic loading by taking into account fillers inside the pores. Several parameters are discussed: (i) type of base material, (ii) relative density, (iii) strain rate, (iv) filler type, (v) size of the cellular structure and (vi) thermal conductivity. Evaluated computational models of closed- and open-cell cellular structures enable solving a dynamic, coupled problem, considering the interaction between the structure (cellular structure) and the fluid (filler) under large deformations. The influence of gas trapped inside the closed-cell cellular structure has been analysed with the representative volume element. The analysis of the liquid filler inside the pores of the open-cell cellular structures has been performed with the combination of the finite element method and the meshless method Smoothed particle hydrodynamics. The developed models have been used to evaluate and simulate the influence of the cellular structure size, relative density, filler viscosity and its flow through the cellular structure. Consequently, the influence of those parameters on the cellular structure behaviour has been determined. The LS-DYNA co de has been used to perform dynamic computational simulations. The base material properties have been determined with experimental measurements of specimens under quasi-static and dynamic uniaxial loading conditions. Computational simulations have proven that the base material has the highest influence on the behaviour of cellular structures under impact conditions. The increase of the relative density and strain rate results in increase of the cellular structure stiffness. Parametrical numerical simulations have also confirmed that filler influences the behaviour of the cellular structures which depends on the loading type and the size of the cellular structure. Increased impact energy absorption has been noted and proven in open-cell cellular structures with higher filler viscosity and higher relative density. Determined behaviour of detailed modelled cellular structures and the acquired constitutive models with computational simulations can be used for further development of homogenised mode Is. These models will allow for faster, easier and more efficient computational simulations of cellular structures in general engineering applications.
Vrsta gradiva - disertacija
; neleposlovje za odrasle
Založništvo in izdelava - [Maribor : M. Vesenjak], 2006
GS II 0000619168 glavno skladišče
GS II 619168 glavno skladišče
prosto - za čitalnico
Vnos na polico
Dodajanje gradiva na polico je uspelo.
Dodajanje gradiva na polico je spodletelo.
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Bibliografsko gradivo je bilo uspešno dodano na polico.
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Gradivo je že na polici.
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Naročanje gradiva za izposojo v čitalnice
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Urnik dostave gradiva z oznako DS v signaturi