Strek, Tomasz, Matuszewska, Agata, and Jopek, Hubert
Subjects
FINITE element method, AUXETIC materials, POISSON'S ratio, MODULUS of rigidity, DEFORMATIONS (Mechanics)
Abstract
The contact problem between two bodies: plate and semi-cylindrical bar is studied in this paper. The analysis concerns the contact pressure distribution along the contact region, as well as the deflection of the plate. Furthermore, the case of a composite plate covered with the auxetic layer is also considered. The influence of the Poisson's ratio of the layer on the behavior of the plate is studied. The contact pressure distribution along the contact area is analyzed using finite element analysis. [ABSTRACT FROM AUTHOR]
Harkati, El Haddi, Daoudi, Nour El‐Houda, Abaidia, Chames Eddine, Bezazi, Abderrezak, and Scarpa, Fabrizio
Subjects
ELASTICITY, POISSON'S ratio, FINITE element method, DEFORMATIONS (Mechanics), TRUSSES
Abstract
We propose in this paper analytical and numerical models that describe the in-plane uniaxial elastic properties (Young's moduli and Poisson's ratios) of a honeycomb structure with curved walls. We perform a parametric analysis of the mechanical performance of this honeycomb also by taking into account the different types of deformations acting inside the cell walls. The curved wall honeycomb possesses higher magnitudes of the Poisson's ratio ν12 in the auxetic configuration compared to classical center symmetric configuration with straight cell wall. The presence of the curvature also allows creating configurations with positive Poisson's ratio even for negative internal cell angles, and makes this honeycomb design attractive for mechanical tailoring. [ABSTRACT FROM AUTHOR]
Farrugia, Pierre-Sandre, Gatt, Ruben, Lonardelli, Enrico Zammit, Grima, Joseph N., and Evans, Ken E.
Subjects
DEFORMATIONS (Mechanics), AUXETIC materials, FINITE element method, STRUCTURAL analysis (Engineering), THICKNESS measurement, POISSON'S ratio
Abstract
An extensive investigation is carried out on the missing rib square grid structure using finite element simulations. This showed that, in the cases considered in this study, the type of deformation is primarily dependent on the ratio of the thickness of different ribs with the structure behaving like an anti-tetrachiral at particular ratios. The analysis also showed that the ability of the structure to deform predominantly through the bending of the ligament allows it to achieve much more negative values of the Poisson's ratio than previously reported. Confirmation of the numerical results is obtained through experimental methods involving the 3D printing of representative structures which are subsequently subjected to compression. [ABSTRACT FROM AUTHOR]