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RISS 인기검색어
- 검색키워드
- 저자 : Guangqiang Fang (검색결과 2 건)
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Guangqiang Fang,Peng Qu,Zhengli Cao,Feizhou Shi 한국섬유공학회 2022 Fibers and polymers Vol.23 No.5
In this paper, the mechanical properties of a single-ply woven composites are investigated through a combinationof multiscale numerical simulation and experimental test. The tensile experiments of three woven structures with differentthread counts, 4.5+4.0, 5.5+7.0 and 5.5+5.0, are conducted. A multiscale numerical method is proposed in order tounderstand the influence mechanism of thread count on the mechanical properties. The numerical predictions have a goodagreement with the experimental results. Many unique characteristics of the single-ply woven composites have beenobserved, such as the clearly nonlinear mechanical behavior of samples with large thread count, the positive transversalnormal strain during the initial phase of longitudinal uniaxial tension and the breakage morphology in relation to threadcount. The M/L ratio is proposed in this paper to investigate the effect of the difference in the thread count between warp andfill direction on the mechanical behavior. The M/L ratio of thread count of 5.5+7.0 specimen is larger than 4.5+4.0 and5.5+5.0 by 38 % and 41 %, respectively, the corresponding M/T ratio of modulus is larger by 34 % and 29 %, and for strengthit is 23 % and 24 %. It is found that the increase of thread count in one direction improves the mechanical properties in thisdirection but reduces the equivalent elastic modulus and strength in the vertical direction. The simulated stress and straindistribution inside the RUC helps to better understand the influence mechanism of thread count on the mechanical propertiesof single-ply woven composites.
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Peng Qu,Guangqiang Fang,He Kong,Zhengli Cao,Jia Ma,Zhiyi Wang,An-Fu Guo,Shaoqing Wang,Xunjin Li,Xinran Shan 한국섬유공학회 2023 Fibers and polymers Vol.24 No.9
Shape memory epoxy polymer reinforced by single-ply weave fabric (SMEP-W) possesses high specific stiffness, good foldability, and satisfactory shape memory capability. These advantages make them promising materials for deployable space structures and increasingly attract research interests. Understanding the influence of weave structures on static and dynamic mechanical properties is crucial to structural design and mechanical response prediction. In this paper, a recently developed SMEP-W was prepared. The static shear experiments were conducted through modified shear test fixtures, and the stress field under static shear load was simulated through a multi-scale numerical modelling method. The dynamic mechanical analysis was carried out to evaluate the shape memory capability. SMEP-W shows nonlinear mechanical behavior under in-plane shear load, especially for the one with less thread count. The increase in the number of threads enhances the constraints between warp yarns and weft yarns, leading to an increase in shear modulus and reducing the scattering of static mechanical properties. The stress distribution on the yarns has the characteristic of center symmetry. High-stress regions appear on the overlapping surface of the crossover regions. Compared with shape memory epoxy polymer (SMEP), the glass transition temperature and damping coefficient of SMEP-W are significantly reduced, and the stiffness is remarkably enhanced. The difference in thread count between warp direction and weft direction does not notably affect the glass transition temperature and tan δ, but has a remarkable influence on the storage modulus. The present work could provide basic observation for understanding the influence of thread count on the shear mechanical properties and dynamic mechanical properties of SMEP-W.
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