Finite Element Analysis of Auxetic Concrete
Mentor 1
Konstantin Sobolev
Mentor 2
Aparna Deshmukh
Start Date
16-4-2021 12:00 AM
Description
Auxetics are materials or structures that have a negative or neutral Poisson ratio. This means that when a material is in tension, the cross-sectional area will increase and vice versa when the material is compressed. This occurs due to the internal structure of the materials or object, which is achieved by the chemical structure or cuts made into the material to create the structure. Auxetics can improve the mechanical properties by enhancing shear, indention resistance, damping, and fracture toughness. Due to these properties, auxetics could be applied to cement based composite structures to improve the lifetime and strength of the applications. For concrete applications, the focus will be on auxetic structures by creating a geometry made from concrete that will have a negative or neutral Poisson ratio. There are may types of geometries that can achieve auxetic behavior including: origami, chiral, Kirigami and many more. The geometry chosen in this research is Kirigami which uses an array of equilateral quadrilateral (rhombus) or elliptical cuts to achieve the desired auxetic properties. To design an optimal Kirigami geometry for experimentation, a geometry had to be designed specific to the conditions the sample may experience. Also, because there is an infinite number of configurations for each geometry (i.e. number of cuts, cut sizes, cut spacing, cut type, etc.) these geometries had to be created using parametric design. These parametrically designed geometries were then simulated under the same conditions and compared to get a better understanding of how these parameters affect properties such as stress and deformation.
Finite Element Analysis of Auxetic Concrete
Auxetics are materials or structures that have a negative or neutral Poisson ratio. This means that when a material is in tension, the cross-sectional area will increase and vice versa when the material is compressed. This occurs due to the internal structure of the materials or object, which is achieved by the chemical structure or cuts made into the material to create the structure. Auxetics can improve the mechanical properties by enhancing shear, indention resistance, damping, and fracture toughness. Due to these properties, auxetics could be applied to cement based composite structures to improve the lifetime and strength of the applications. For concrete applications, the focus will be on auxetic structures by creating a geometry made from concrete that will have a negative or neutral Poisson ratio. There are may types of geometries that can achieve auxetic behavior including: origami, chiral, Kirigami and many more. The geometry chosen in this research is Kirigami which uses an array of equilateral quadrilateral (rhombus) or elliptical cuts to achieve the desired auxetic properties. To design an optimal Kirigami geometry for experimentation, a geometry had to be designed specific to the conditions the sample may experience. Also, because there is an infinite number of configurations for each geometry (i.e. number of cuts, cut sizes, cut spacing, cut type, etc.) these geometries had to be created using parametric design. These parametrically designed geometries were then simulated under the same conditions and compared to get a better understanding of how these parameters affect properties such as stress and deformation.
