INVESTIGATION OF AUXETIC MATERIAL BEHAVIOUR USING FEA METHOD

Abstract

Finite element analysis (FEA) is a numerical method for solving problems of engineering that involve complex geometries and material properties. FEAcan help to understand predict and modify the behavior of materials under various conditions, such asstress, strain, temperature, fluid flow, and electromagnetic fields. FEA can also help to redesign with optimize the design, performance, and reliability of materials, products, and systems. FEA is a powerful and versatiletool that can provide detailed and accurate information about material behavior, as well assupport innovation and development in various industries and fields. However, FEA also has some drawbacks such as requiring a lot of data, computational time, and high memory capacity, some errors compared to the real-world complexities, requiring proper engineering knowledge and expertise to interpret the results and validate the solutions, and involving making assumptions and simplifications to represent the continuum with finite elements. Therefore, FEA results should always be verified and validated with experimental data and other methods. Negative Poisson ratio material attract attention due to their unusual and unintuitive behavior of them when stretched or compressed. Due to the unusual properties of this material, this material possesses high shear strength very high indentation resistance, and less usage of material. The unit cell is the backbone of the overall structure and repetition of this gives the desired properties to the overall structure. The reentrant structure can withstand stress and also has energy absorption capacity up to some extent compared to other available structures. The ultimate stress and energy absorption capacity of the structure can be enhanced by improving the unit cell design and optimizing it by providing certain angles and thickness of the cell. The behavior of the structure can be studied by the Finite Element method as well as the conventional compression test and both results should be compared to understand the response of the structure. The stiffness, strength, and energy-absorbing capacity of the structure is improved by redesigning the unit cell design.