%0 Journal Article
%T Full
%A Bing Zhao
%A Han Zhou
%A Jianwen Chen
%A Mingyang Wang
%A Weiwei Sun
%A Wujun Chen
%J Textile Research Journal
%@ 1746-7748
%D 2019
%R 10.1177/0040517518783359
%X It is undeniable that full-strain range characteristics of Poisson¡¯s ratios on the behaviors of a fabric composite are crucial. However, there have been relatively few papers devoted to this subject. In this study, tensile tests of seven bias angles with a 15¡ã increment are conducted on a typical coated biaxial warp-knitted fabric (BWKF) to estimate the Poisson¡¯s ratios in full-strain range. By utilizing the digital image correlation technique, experimental results are processed, and detailed responses of strain contours and Poisson¡¯s ratios are determined for specific strain states. Then, two typical types, that is recession and peak types, of the Poisson¡¯s ratio strain curves are proposed and their characteristics evolving with the strain, bias angle and stress state are discussed. Results show that characteristics of Poisson¡¯s ratios and strain contours vary noticeably with the yarn orientations, strain and stress levels. As the strain increases, the Poisson¡¯s ratio of peak type first ascends markedly, and then descends moderately after arriving at a peak, generating three distinct stages: the ascending, peak and post-peak stages; in contrast, the recession type only experiences a downward trend, resulting in two characteristic stages: the recession and stable stages. In addition, there is an M-shaped relationship between the Poisson¡¯s ratio and bias angle, with a local valley at 45¡ã, which is not consistent with results in previous works. This investigation could provide new insights into the orientation dependence, Poisson effect and warp¨Cweft interaction mechanism of BWKFs
%K biaxial warp-knitted fabric (BWKF)
%K full-strain range
%K bias angle
%K orientation dependence
%K digital image correlation (DIC)
%K Poisson¡¯s ratio
%K deformation
%U https://journals.sagepub.com/doi/full/10.1177/0040517518783359