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Keywords = draw-induced crimp

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20 pages, 5555 KB  
Article
Drawing-Induced Crimp Formation and Wettability of Four-Lobed Side-by-Side PBT/PET Bicomponent Fibers
by Xinkang Xu, Pei Feng, Zexu Hu, Jiazheng Wang, Qianchun Xu and Chongchang Yang
Polymers 2025, 17(18), 2529; https://doi.org/10.3390/polym17182529 - 18 Sep 2025
Viewed by 357
Abstract
PBT/PET side-by-side bicomponent fibers form helical crimp structures under thermal or mechanical stress, though the mechanism behind mechanically induced crimping remains unclear. In this study, four-lobed cross-sectional PBT/PET side-by-side bicomponent fibers were produced and subjected to drawing from 1.6 to 4.0 times at [...] Read more.
PBT/PET side-by-side bicomponent fibers form helical crimp structures under thermal or mechanical stress, though the mechanism behind mechanically induced crimping remains unclear. In this study, four-lobed cross-sectional PBT/PET side-by-side bicomponent fibers were produced and subjected to drawing from 1.6 to 4.0 times at 80 °C to induce crimping. Increasing draw ratios significantly enhanced fiber tenacity (from 0.64 to 3.91 cN/dtex) and reduced crimp radius (from 2.05 mm to 0.64 mm). A predictive crimp curvature model integrating Denton’s crimp theory and a four-element viscoelastic model was established, with corrected results achieving an R2 of 0.9951. Additionally, four-lobed fibers showed better wettability, with a static contact angle 3.56° lower than that of circular fibers. This work provides theoretical guidance for high-performance self-crimping fiber design. Full article
(This article belongs to the Section Polymer Fibers)
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21 pages, 12365 KB  
Article
Active Reinforcing Fiber of Cementitious Materials Using Crimped NiTi SMA Fiber for Crack-Bridging and Pullout Resistance
by Eunsoo Choi, Ha Vinh Ho and Jong-Su Jeon
Materials 2020, 13(17), 3845; https://doi.org/10.3390/ma13173845 - 31 Aug 2020
Cited by 20 | Viewed by 2872
Abstract
This study investigated the recovery stress and bond resistance of cold drawn crimped SMA fiber using two different initial diameters of 1.0 and 0.7 mm. These characteristics are important to the active prestressing effect and crack-closing of the fiber. NiTi SMA fiber was [...] Read more.
This study investigated the recovery stress and bond resistance of cold drawn crimped SMA fiber using two different initial diameters of 1.0 and 0.7 mm. These characteristics are important to the active prestressing effect and crack-closing of the fiber. NiTi SMA fiber was used for the cold drawing, and then crimped shapes were manufactured with various wave heights. After that, tensile, recovery, and pullout tests were conducted. The cold drawn crimped fiber showed softening tensile behavior more clearly than the cold drawn straight fiber when not subjected to heating, whereas they had the same tensile behavior under heating. The recovery stress and the residual stress of the crimped fibers were less than those of the straight fiber with the same diameter. Moreover, crimped fibers with a large diameter and higher wave height would induce more recovery stress and residual stress. The maximum pullout resistance of the crimped fiber was a function of the wave depth, embedded length, yield strength, and flexural rigidity of the fiber. Full article
(This article belongs to the Section Construction and Building Materials)
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