Abstract
Abstract
Additive Manufacturing (AM) enables the processing of complex auxetic structures with exceptional engineering features. Materials that exhibit a negative Poisson ratio are known as auxetic materials. Inconel is an industrial-based material that provides high resistance to mechanical failure, creep, and oxidation at elevated temperatures. The present work aims to study and investigate the mechanical behaviour of the topology-optimized anti-tetra chiral auxetic structure of Inconel 718 through selective laser melting (SLM). The auxetic structure was designed by varying the cell size (2 and 3) and relative density (30%, 50%, and 70%), and their compression behaviour was investigated. Finite element models were developed using ANSYS, and their performance was investigated. The experimental analysis was performed through a uniaxial quasi-static compression testing machine, and their results were analyzed. The failure mechanism, stress–strain curve, and Poisson ratio were examined. FE models’ results expressed that deformation and strain increased with relative density for both cell sizes and gained good auxetic behaviour. The experimental findings also support that comparatively, cell size 2 with 70% relative density attained maximum compression strength of 908.42 MPa. The morphological study of the samples implies that 30% RD sample exhibits more noticeable deformation, and 70% RD samples attained uniform collapse with improved stiffness. This study encompasses the technique for developing high-performance auxetic structures, which are optimized for turbine blade applications.