1. The localization of deformations in mechanical metamaterial with a twist. numerical investigation.
- Author
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Akhmetshin, L. R., Smolin, I. Yu., Panin, Victor E, and Fomin, Vasily M
- Subjects
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DEFORMATIONS (Mechanics) , *METAMATERIALS , *YOUNG'S modulus , *STRESS concentration , *POROSITY , *ELASTICITY - Abstract
The paper deals with the problem of deforming a mechanical metamaterial. The metamaterial is constructed from chiral elements comprising rings and ribs. The behavior of the bulk metamaterial sample during compression was studied numerically in the framework of linear elasticity theory. Due to the chiral structure, the metamaterial sample exhibits unusual effects. One of them relates to nonlinear transformations, namely a twist. It was found that the deformations are distributed irregularly over the material. During the compression of the metamaterial sample, the rings undergo a torque, and the ribs begin to bend. All the ribs of the metamaterial sample undergo similar bending. Additionally, there are areas affected by two codirectional bends with different signs. Strain localization and the corresponding stress concentrations are of great importance from the strength analysis point of view. As for Young's modulus, it is significantly (by 100 times) less for the metamaterial sample than for the base material. It is justifiable since the ratio of the volume of a base solid to the volume of the metamaterial is quite large. When constructed the tetrachiral structure, the porosity value is 98%. [ABSTRACT FROM AUTHOR]
- Published
- 2020
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