Calculation of fabrics Poisson ratio based on biaxial extension

Poisson ratio is one of the important parameters of fabric mechanical properties.However,there are certain difficulties in measurement.In this paper,the plate theory was applied to describe the biaxial extension of fabric,and a method to calculate Poisson ratio was proposed.By using the KES-G2 bi-extension tester,seven woven fabrics and two knitted fabrics were tested,their Poisson ratios were thus calculated and compared with the results obtained by using the bias extension method in order to verify the reliability of the biaxial extension method.The results indicate that both of the Poisson ratios obtained by using,above two methods are approximate to each other under the condition of applying the same Young′s parameters,and the biaxial extension method is more simple and practical.