A New Theoretical Equation to Estimate Poisson셲 Ratio for Coated Bi-axial Warp Knitted Fabrics under Bias Tensile Loading 


Vol. 19,  No. 12, pp. 2631-2641, Dec.  2018
10.1007/s12221-018-8025-2


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  Abstract

Tensile tests of seven bias angles with a 15 o increment with respect to the warp direction are conducted on a typical coated bi-axial warp knitted fabric (BWKF). By utilizing the Digital Image Correlation technique, the experimental results are processed, and detailed responses of strain contours and Poisson셲 ratios are determined for some specific strain levels, and an extraordinary M-shaped relationship between Poisson셲 ratio and bias angle is revealed. Then, the tested Poisson셲 ratios are compared with corresponding theoretical predictions from the original theory for ordinary anisotropic materials, discrepancies and their possible causes are analyzed. Finally, the original theory used for Poisson셲 ratio predication of ordinary anisotropic materials is modified for application to the BWKFs by considering the unique local valley at 45 o caused by structural differences and possible yarn movements. The modified theoretical equation could exhibit the Mshaped relationship between Poisson셲 ratio and bias angle, and is validated due to the high similarity between the predictions and experimental results. This investigation could provide some new insights into the orientation-dependence, Poisson셲 effect and complex deformation mechanism of BWKFs.

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  Cite this article

[IEEE Style]

J. Chen, H. Zhou, B. Zhao, W. Chen, M. Wang, Z. Xu, "A New Theoretical Equation to Estimate Poisson셲 Ratio for Coated Bi-axial Warp Knitted Fabrics under Bias Tensile Loading," Fibers and Polymers, vol. 19, no. 12, pp. 2631-2641, 2018. DOI: 10.1007/s12221-018-8025-2.

[ACM Style]

Jianwen Chen, Han Zhou, Bing Zhao, Wujun Chen, Mingyang Wang, and Zhihong Xu. 2018. A New Theoretical Equation to Estimate Poisson셲 Ratio for Coated Bi-axial Warp Knitted Fabrics under Bias Tensile Loading. Fibers and Polymers, 19, 12, (2018), 2631-2641. DOI: 10.1007/s12221-018-8025-2.

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