Materials with negative Poisson?s ratio are called auxetics and they present enhanced properties (e.g. damping, indentation resistance, fracture toughness impact resistance) under external loadings. The auxetic derived from peculiar-shaped microstructures, such as starshaped frames. In the investigation, several applications studied using microstructures. Finite element models developed for dyn...

Abstract Foams are mainly composed of dispersed gas trapped in a liquid or solid phase making them lightweight and thermally insulating materials. Additionally, they applicable for large surfaces, which makes attractive thermal insulation. State-of-the-art foams made synthetic polymeric materials such as polystyrene. This work focuses on generating foam from surfactants renewable lignocellulosi...

New acoustic multilayer absorber fabricated by coupling closed-cell metallic foam and open-cell polymeric foam, which aimed to develop a practical use of in the noise control application. In prior, individual sound absorption coefficient both materials with different thicknesses measured impedance tube method as per ASTM E-1050. Using inverse characterization technique, intrinsic properties nee...