Predicting strength of a unidirectional composite containing interface crack
Predicting strength of a unidirectional composite containing interface crack
复制标题
DOI：
10.1016/j.compscitech.2021.108665
复制
发表时间：
2021-05
影响因子：
9.1
通讯作者：
Runhong Mao;Zheng-ming Huang;Zhi‐Wei Wang
中科院分区：
文献类型：
--
作者：
Runhong Mao;Zheng-ming Huang;Zhi‐Wei Wang
本文采用解析桥模型、数值GMC方法和高保真广义细胞方法对含裂纹纤维和复合材料界面的单向复合材料进行失效分析。通过桥联张量将基体中的内应力与纤维中的内应力联系起来，桥联模型与GMC/HFGMC的区别在于桥联张量及其确定方法。根据不同的桥联张量，计算了裂纹界面前后复合材料中基体的应力集中系数。基于不同桥联张量和SCF产生的真实应力，对UD复合材料的离轴拉伸强度进行了预测。共制定了9种不同的预测方案。将预测结果与自制的碳纤维、芳纶、亚麻纤维复合材料的实验数据进行了比较。结果表明，基于桥联模型方程的预测结果与实验结果吻合较好。
In this paper, both analytical Bridging Model and numerical GMC (Generalized Method of Cells) and HFGMC (High-Fidelity Generalized Method of Cells) are applied to analyze failures of a unidirectional (UD) composite with a cracked fiber and matrix interface. Interconnecting the internal stresses in the matrix with those in the fiber by a bridging tensor, the difference between Bridging Model and GMC/HFGMC is in the bridging tensors and the method of determining them. The stress concentration factors (SCFs) of the matrix in the composite before and after the cracked interface are calculated upon the different bridging tensors. Based on the true stresses resulted from the different bridging tensors and the SCFs, off-axial tensile strengths of UD composites are predicted. A total number of 9 different prediction schemes are made. The predicted results are compared with the experimental data of carbon, aramid, and flax fiber composites prepared and measured by ourselves. It is found that the predictions based on the Bridging Model equations provide overall the best agreement with the experiments.