摘要
开展了混杂纤维自动铺丝环氧树脂复合材料层合板高速冲击失效行为的研究。首先,测试了纯碳纤维增强环氧树脂层合板和纯芳纶纤维增强环氧树脂层合板的准静态力学性能,以获得其力学性能参数;然后,以芳纶纤维质量分数为基准,开展了不同混杂比层合板的钛合金弹体高速冲击试验,探究混杂比对混杂纤维增强环氧树脂复合材料抗冲击性能的影响;接着,建立了混杂纤维增强环氧树脂复合材料层合板的高速冲击有限元模型,基于Murakami-Ohno损伤演化理论建立了复合材料层合板的渐进损伤本构模型,并引入应变率效应系数以考虑应变率的影响,采用损伤变量和单元畸变协同控制单元删除。开展了不同混杂比层合板的高速冲击模拟,分别得到了相应的临界穿透速度。高速冲击试验结果表明,临界穿透速度随着混杂比的增加呈现逐渐增加的趋势,具有正混杂效应。通过与相应的准静态及高速冲击试验结果对比,该模型能够比较准确的预测混杂纤维增强环氧树脂复合材料层合板的准静态力学响应和高速冲击响应,临界穿透速度结果相差在4.5%以内。
This paper is aimed to perform a numerical simulation study on the high-velocity impact failure behavior of hybrid fiber reinforced epoxy composite laminates based on the finite element model. Firstly, quasi-static mechanical tests of pure carbon fiber reinforced epoxy composites and pure aramid fiber reinforced epoxy composites were carried out to obtain their basic mechanical properties. Then, high-velocity impact tests were conducted to determine the critical penetration velocity and explore the influence of hybrid ratio on the impact resistance of hybrid composite reinforced composite laminates. The finite element model of high-velocity impact for hybrid fiber laminates was established, and the progressive damage constitutive of composite laminates was developed on the basis of the Murakami-Ohno damage evolution theory. The strain rate effect coefficient was introduced to consider strain rate dependency, and the element deletion was co-controlled by damage variable and element distortion in parallel. Then the high-velocity impact simulation for different hybrid ratio laminates was carried out and the corresponding critical penetration velocity was obtained respectively. The experimental results of high-velocity impact show that the critical penetration velocity increases with the increasing hybrid ratio, exhibiting a positive hybrid effect. Compared with the experimental results, the proposed model can accurately predict the quasi-static mechanical response and high-velocity impact response for the hybrid fiber reinforced epoxy composites, and the difference of the critical penetration velocity is less than 4.5%.
作者
曹俊超
孙建波
曹勇
张晨旭
杨智勇
张超
CAO Junchao;SUN Jianbo;CAO Yong;ZHANG Chenxu;YANG Zhiyong;ZHANG Chao(School of Aeronautics,Northwestern Polytechnical University,Xi’an 710072,China;Shaanxi Key Laboratory of Impact Dynamics and Its Engineering Applications,Northwestern Polytechnical University,Xi′an 710072,China;Aerospace Research Institute of Material&Processing Technology,Beijing 100076,China;Institute of Applied Mechanics,College of Mechanical and Vehicle Engineering,Taiyuan University of Technology,Taiyuan 030024,China;Luoyang Ship Material Research Institute,Luoyang 471039,China)
出处
《复合材料学报》
EI
CAS
CSCD
北大核心
2022年第10期4935-4948,共14页
Acta Materiae Compositae Sinica
基金
国家自然科学基金(12002286,12172303)。
关键词
混杂纤维
复合材料
高速冲击
有限元模型
渐进损伤本构
临界穿透速度
hybrid fiber
composites
high-velocity impact
finite element model
progressive damage constitutive
critical penetration velocity
