Comparison of Constant-Force Increment and Constant-Rate Loading Protocols in Biaxial Tests of Coated Fabrics
Publication: Journal of Materials in Civil Engineering
Volume 29, Issue 11
Abstract
Biaxial tension testing is an increasingly accepted tool to understand the mechanical behavior of architectural coated fabric membrane materials. However, different loading protocols in biaxial tests result in diverse results. This study investigates the different results between constant-force increment (CFI) and constant-rate (CR) loading protocols. Different loading procedures were proposed on a self-made biaxial tension tester to conduct systematic experiments. The mechanical behavior of a typical fabric was investigated by both CFI and CR loading. The stress-strain curves and their mechanical characteristics were compared. On the basis of test data, the authentic weft stress values in the CR loading protocol were observed to be 20% lower than the nominal load value. The elastic modulus determined by CR loading was significantly larger than that acquired by CFI loading. An obvious viscous effect is seen in the unloading stage under CFI loading. This did not arise under CR loading. Future work might focus on material to further strengthen the conclusion.
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Acknowledgments
The authors gratefully acknowledge the financial support from the National Natural Science Foundation of China (Nos. 51478264, 51278299, and 51608320). Ligang Wang took part in conducting experiments and did preliminary data analysis. The authors acknowledge with thanks this help and additional help from others unmentioned.
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©2017 American Society of Civil Engineers.
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Received: Nov 3, 2016
Accepted: May 25, 2017
Published online: Sep 5, 2017
Published in print: Nov 1, 2017
Discussion open until: Feb 5, 2018
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