Applicability of two-step homogenization to high-crimp woven composites
Applicability of two-step homogenization to high-crimp woven composites
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DOI：
10.1016/j.compstruct.2019.111157
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发表时间：
2019-06
影响因子：
6.3
通讯作者：
Higor Galdino da Silva;Kostiantyn Vasylevskyi;B. Drach;I. Tsukrov
中科院分区：
文献类型：
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作者：
Higor Galdino da Silva;Kostiantyn Vasylevskyi;B. Drach;I. Tsukrov
本文研究了两步均匀化方法对碳/环氧3D编织复合材料的适用性。该方法的第一步涉及由波浪形纤维束组成的增强体的微尺度均化。有限元分析（FEA）被用来获得显式建模和均匀化的纤维体积分数为70%的波形丝束的均匀化性能。两个几何参数进行了研究：卷曲率和波长归一化纤维直径。有效的弹性性能被证明是敏感的归一化波长参数的值50，在这一点上，他们达到渐近值和分离的规模可以claimed.The得到的均匀化性能的波浪丝束被用来计算有效的弹性性能的一个高卷曲和两个低卷曲的三维编织复合材料使用FEA。数值两步均匀化的结果与实验数据和一个简单的Voigt模型进行了比较。良好的相关性观察实验结果和均匀化的基础上直接有限元分析。所考虑的Voigt近似可用作低卷曲机织复合材料杨氏模量的合理的一阶估计。
This paper examines applicability of a two-step homogenization approach to carbon/epoxy 3D woven composites. The first step of this approach involves microscale homogenization of the reinforcement consisting of wavy bundles of fibers. Finite Element Analysis (FEA) is used to obtain homogenized properties of explicitly modeled and homogenized wavy tows with fiber volume fraction of 70%. Two geometric parameters are investigated: crimp ratio and wavelength normalized by fiber diameter. Effective elastic properties are shown to be sensitive to the normalized wavelength parameter up to the value 50 at which point they reach asymptotic values and the separation of scales can be claimed.The resulting homogenized properties of the wavy tows are used to calculate the effective elastic properties of one high-crimp and two low-crimp 3D woven composites using FEA. The results of the numerical two-step homogenization are compared with experimental data and a simple Voigt model. Good correlation is observed between experimental results and the homogenization based on direct FEA. The considered Voigt approximation may be used as a reasonable first order estimate for Young’s moduli in low-crimp woven composites.