Li Beibei, Liu Cheng, Zhao Xiaoyu, Ye Jinrui, Guo Fei
School of Mechanical and Automotive Engineering, Shanghai University of Engineering Science, Shanghai 201620, China.
Department of Civil Engineering, Zhejiang College of Construction, Hangzhou 311231, China.
Materials (Basel). 2023 Mar 28;16(7):2689. doi: 10.3390/ma16072689.
Time and temperature affect the viscoelasticity of woven composites, and thus affect their long-term mechanical properties. We develop a multiscale method considering fiber twist angle and interfaces to predict viscoelasticity. The multiscale approach is based on homogenization theory and the time-temperature superposition principle (TTSP). It is carried out in two steps. Firstly, the effective viscoelasticity properties of yarn are calculated using microscale homogenization; yarn comprises elastic fibers, interface, and a viscoelastic matrix. Subsequently, the effective viscoelasticity properties of woven composites are computed by mesoscale homogenization; it consists of homogenized viscoelastic yarns and matrix. Moreover, the multiscale method is verified using the Mechanics of Structure genome (MSG) consequence. Finally, the effect of temperature, fiber twist angle, fiber array, and coating on either the yarn's effective relaxation stiffness or the relaxation moduli of the woven composite is investigated. The results show that increased temperature shortens the relaxation time of viscoelastic woven composites, and fiber twist angle affects tensors in the relaxation stiffness matrix of the yarn; the coating affects the overall mechanical properties of woven composites as well.
时间和温度会影响机织复合材料的粘弹性，进而影响其长期力学性能。我们开发了一种考虑纤维捻角和界面的多尺度方法来预测粘弹性。该多尺度方法基于均匀化理论和时间 - 温度叠加原理（TTSP）。它分两步进行。首先，使用微观尺度均匀化计算纱线的有效粘弹性性能；纱线由弹性纤维、界面和粘弹性基体组成。随后，通过细观尺度均匀化计算机织复合材料的有效粘弹性性能；它由均匀化的粘弹性纱线和基体组成。此外，使用结构基因组力学（MSG）结果对多尺度方法进行了验证。最后，研究了温度、纤维捻角、纤维排列和涂层对纱线有效松弛刚度或机织复合材料松弛模量的影响。结果表明，温度升高会缩短粘弹性机织复合材料的松弛时间，纤维捻角会影响纱线松弛刚度矩阵中的张量；涂层也会影响机织复合材料的整体力学性能。
