1. Tensile behavior of needle-punched nonwoven geotextiles based on in-situ X-ray computed tomography and numerical simulation.
- Author
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Li, Ke-Yi, Tang, Xiao-Wu, Fei, Min-Liang, Feng, Shi-jin, Tang, Jia-jie, Xiang, Qing-Qing, and Wang, Heng-yu
- Subjects
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COMPUTED tomography , *FIBER orientation , *MANUFACTURING processes , *GEOTEXTILES , *NUMERICAL analysis - Abstract
There are situations where geotextiles are subjected to uniaxial tensile strain, which may result in noticeable variations in their filtration performance. This study accordingly investigated the behaviors of needle-punched nonwoven geotextiles during tensile testing using in-situ X-ray computed tomography. Furthermore, a numerical analysis of the variation in pore size characteristics was performed by establishing a geotextile model based on the web formation and bonding manufacturing process. The pore size and fiber orientation distributions were subsequently investigated and a model for the changes in the pore characteristics was established and validated. With increasing tension strain in the machine direction, the pore throat size distribution curve exhibited an overall shift towards larger sizes, and the characteristic pore sizes ranging from 10% to 98% either initially decreased, then increased or consistently increased. Furthermore, the fiber distribution was predominantly within the geotextile plane along the machine direction, and as the strain increased, the fibers stretched and aligned along the direction of the tensile load along the machine direction. Finally, the experimental findings of this study and relevant test results from the literature were thoroughly interpreted. The numerical model align well with the actual changes in pore size characteristics observed under tensile strain. • The tensile behaviors of nonwoven geotextiles during testing were revealed in situ with X-ray computed tomography. • The numerical simulation analysis of the pore size characteristics variation was realized by establishing a geotextile mode. • A model for the changes in pore characteristics of the geotextile under tensile strain was established. • The simulation method can well predict the variation in pore size characteristics under uniaxial tensile strain. [ABSTRACT FROM AUTHOR]
- Published
- 2024
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