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Modelling and analysis of auxetic materials response on the mechanical loading
Vítek, Tomáš ; Skalka, Petr (referee) ; Ševeček, Oldřich (advisor)
This bachelor’s thesis is focused on auxetic materials, especially on their response on the mechanical loading. Historical development, significant mechanical properties, different ways of modelling and possible practical applications of these materials are described in the research part of the thesis. The computational part deals with the detailed analysis of selected auxetic structures in order to evaluate their elastic properties depending on different geometric parameters and also on the magnitude of applied deformation. Computational modelling is primarily performed using the software ANSYS Mechanical APDL based on the finite element method (FEM). This method is briefly explained in one chapter. In the following part of the thesis the process of creating a parametric model and reducing the whole structure to a minimum geometry size (a part of a basic unit) is described. A detailed explanation of generating the mesh and setting appropriate boundary conditions is also included together with the results evaluation. Elastic properties obtained by numerical simulations are then compared to available analytical model. Dependencies of elastic properties are presented for a wide range of values of selected geometric parameters and applied deformations of the structure considering small and large deformation regimes. An influence of these parameters on a structure response during the mechanical loading is discussed based on these dependencies. At the end of the thesis the values of elastic properties computed using a finite element method are confronted to the experimental data available in the literature and the validity of the computational model is considered based on this comparison.
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Effect of polymer type on the properties of 3D printed auxetic structures
Zbíral, Roman ; Štaffová, Martina (referee) ; Jančář, Josef (advisor)
This thesis deals with special structures such as optical, acoustic and mechanic metamaterials, which has their own specific properties. Auxetic materials as subgroup of mechanical metamaterials has its own special arrangement of sub-cells, that is bound to negative Poisson’s ratio. With mechanical load auxetic materials change its own density, geometry of structure and in thrust only change its internal structure instead of breaking. Most of these materials are made using additive technologies such as 3D print which allows better quality of produced structure and are made of special polymers which provide expected properties.
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|
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Modelling and analysis of auxetic materials response on the mechanical loading
Vítek, Tomáš ; Skalka, Petr (referee) ; Ševeček, Oldřich (advisor)
This bachelor’s thesis is focused on auxetic materials, especially on their response on the mechanical loading. Historical development, significant mechanical properties, different ways of modelling and possible practical applications of these materials are described in the research part of the thesis. The computational part deals with the detailed analysis of selected auxetic structures in order to evaluate their elastic properties depending on different geometric parameters and also on the magnitude of applied deformation. Computational modelling is primarily performed using the software ANSYS Mechanical APDL based on the finite element method (FEM). This method is briefly explained in one chapter. In the following part of the thesis the process of creating a parametric model and reducing the whole structure to a minimum geometry size (a part of a basic unit) is described. A detailed explanation of generating the mesh and setting appropriate boundary conditions is also included together with the results evaluation. Elastic properties obtained by numerical simulations are then compared to available analytical model. Dependencies of elastic properties are presented for a wide range of values of selected geometric parameters and applied deformations of the structure considering small and large deformation regimes. An influence of these parameters on a structure response during the mechanical loading is discussed based on these dependencies. At the end of the thesis the values of elastic properties computed using a finite element method are confronted to the experimental data available in the literature and the validity of the computational model is considered based on this comparison.
|
|
|
Effect of polymer type on the properties of 3D printed auxetic structures
Zbíral, Roman ; Štaffová, Martina (referee) ; Jančář, Josef (advisor)
This thesis deals with special structures such as optical, acoustic and mechanic metamaterials, which has their own specific properties. Auxetic materials as subgroup of mechanical metamaterials has its own special arrangement of sub-cells, that is bound to negative Poisson’s ratio. With mechanical load auxetic materials change its own density, geometry of structure and in thrust only change its internal structure instead of breaking. Most of these materials are made using additive technologies such as 3D print which allows better quality of produced structure and are made of special polymers which provide expected properties.
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