Detailed Deformation Behaviors and Tensile Parameters for Coated Warp-Knitted Fabrics in 2D Stress Space
Publication: Journal of Materials in Civil Engineering
Volume 33, Issue 12
Abstract
Understanding the mechanical properties of membrane materials in two-dimensional (2D) stress space is critical for structural design and mechanical analysis of membrane structures. In this paper, an experimental study of the warp-knitted fabric PVDF8028 subjected to biaxial loads was performed to expose the detailed mechanical behaviors and determine proper elastic parameters for the fabrics under multiple stress ratios. The least-square method was adopted to calculate the elastic parameters for different stress states, and response surfaces of strain and elastic parameters were used to reveal the mechanical behaviors in detail. Comparison between coated plain-woven and warp-knitted fabrics was used for exhibiting the influences of microstructures and deformation mechanisms on the macroscopic mechanical properties of materials. The results show that the stress–strain behaviors exhibit significant nonlinearities, and could be characterized by appropriate response surfaces. The elastic stiffness response surfaces of loading and unloading processes could form an unbalanced X-shaped cross, and detailed elastic parameters in those two processes could be obtained by corresponding response surfaces. Compared with plain-woven fabrics, warp-knitted fabrics could exhibit more obvious nonlinear characteristics due to the existence of their coiled yarns and lower Poisson’s ratios because of the special noncrimp yarn structure. The differences in macroscopic mechanical properties for these two materials result from the corresponding differences in microstructures and deformation mechanisms.
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Data Availability Statement
All data, models, and code generated or used during the study appear in the published article.
Acknowledgments
This work was supported by the Fundamental Research Program of Jiangsu Province (Grant No. BK20191290), the Fundamental Research Funds for the Central Universities (Grant No. 30920021143), the National Natural Science Foundation of China (Grant Nos. 51608270 and 51708345), and the China Postdoctoral Science Foundation (Grant Nos. 2016M601816 and 2017T100371). Some of the tests were conducted in School of Naval Architecture, Ocean and Civil Engineering, Shanghai Jiao Tong University. The authors acknowledge with thanks all this help and other unmentioned ones.
Disclaimer
None of the authors have any financial or scientific conflicts of interest with regard to the research described in this paper.
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Published In
Journal of Materials in Civil Engineering
Volume 33 • Issue 12 • December 2021
Copyright
© 2021 American Society of Civil Engineers.
History
Received: Dec 2, 2020
Accepted: Mar 31, 2021
Published online: Sep 16, 2021
Published in print: Dec 1, 2021
Discussion open until: Feb 16, 2022
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