Auxetics materials possess negative Poisson’s Ratio . This ratio for a wide range of materials is defined by a positive value. Auxetics material under influence of tensil e force laterally expand and when subjected to compressive forces axially elongate. Auxetics property of materials results in improvement on their mechanical behavior such as impact resistance and fracture toughne ss. Thus Auxetics materials have found various use in applications such medical, sports, automobile industry and aero space industry. In recent years, textile Auxetics materials in form o f Auxetics yarns and fabrics hav e become available. The use of knitti ng technology due to versality of this textile fabric manufacturing process in production of textile structure with comple x geometries in comparison to braiding or weaving technologies has enormous potential for production of Auxetics textiles. This resear ch aims to investigate the compressive behavo iur and Poisson’s Ratio of 3 D honey comb structures reinforced w ith knitted fabrics. Thus honey comb polyester knitted fabrics were knitted on a flat electronically controlled knitting machine and were relaxed for 24 hours in standard condition. Composite materials were made using specifically shaped moulds with usual honey comb, com bined and auxetic design using vacuum injection method. The composit samples were cut into pre - defined dimensions. The samples were tes ted subjected to surface pressure exerted using Zwik machine. The amount of axial and transverse strains to gether with Poisson’s Ratio of the samples were measured and compared. Abacus simulation and Timinshinko small strain model were used to predict t h e deformation and the Poisson’s Ratio of the honey c omb s tructures under compressive force. It was found that under influence of compressive force auxetic and usual honey combs structures contract and expand respectively while no significant change in combin ed honey chomb structure was observed. It was also found that Poisson’s Ratio in auxetic and usual honey comb structures varies between - 6 to - 1 and 1.6 to 3.8 respectively. Again no significant change in Poisson’s Ratio of the combined honey comb structure was ob served and Poisson’s Ratio of the combin ed honey comb structure remaind at almost zero value. Finally it was conclude that deformation behavior and amount of Poisson’s Ratio due to simul ation and experimental results for auxetic , usual and combined ho ney comb structures f or values above 5 mm are very compatiable.
