Evaluation of the Fracture Toughness of Short Carbon Fiber Reinforced Thermoplastic Composites

IF 1.5 4区 材料科学 Q3 ENGINEERING, MECHANICAL
Jianfeng Shi, Xinwei Zong, weili jiang, Riwu Yao, Jinyang Zheng
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引用次数: 0

Abstract

Abstract Short carbon fiber (SCF) reinforced thermoplastic composites (SCFRTCs) are attracting broad attention in various fields for their excellent mechanical properties. The fracture toughness, an essential characteristic of the resistance of materials to crack propagation, is considered a critical aspect of the long-term performance of SCFRTCs structures. The fracture toughness of SCFRTCs depends on two competing mechanisms: the interface between SCFs and polymer matrix may promote crack initiation, while the SCFs hinder the crack propagation. In this study, the fracture toughness of SCFRTCs with varying SCFs fractions is first measured by a three-point bending test. The results show that adding SCFs effectively improves the fracture toughness of SCFRTCs, and an increase of up to 73.7% is observed at the SCFs fraction of 9.80 wt%. In addition, it is found that the fracture toughness decreases slightly but is more stable after heat treatment. Subsequently, the full field strain around the crack tip is analyzed by Digital Image Correlation (DIC), and the strain level significantly decreases after adding SCFs. Moreover, the dynamic crack propagation is observed by DIC, and the crack initiation load is obtained successfully to verify the large deformation during crack initiation. Compared with the smooth fracture surface of the HDPE specimen, the fracture surface of the SCFRTCs specimen is much rougher, and obvious bridging SCFs are observed. The larger specific surface area and bridging SCFs of fracture surface absorb more energy during the fracture of SCFRTCs specimen, thus explaining the improved fracture toughness of SCFRTCs.
短碳纤维增强热塑性复合材料断裂韧性的评价
短碳纤维(SCF)增强热塑性复合材料(SCFRTCs)以其优异的力学性能在各个领域受到广泛关注。断裂韧性是材料抗裂纹扩展的基本特征,被认为是scfrtc结构长期性能的关键方面。scfrcs的断裂韧性取决于两种竞争机制:scfrcs与聚合物基体之间的界面促进裂纹萌生,而scfrcs则阻碍裂纹扩展。在本研究中,首先通过三点弯曲试验测量了不同SCFs分数的scfrtc的断裂韧性。结果表明,SCFs的加入有效提高了scfrtc的断裂韧性,当SCFs添加量为9.80 wt%时,断裂韧性提高幅度高达73.7%。另外,热处理后的断裂韧性略有下降,但较为稳定。随后,通过数字图像相关(DIC)分析了裂纹尖端周围的全场应变,发现加入SCFs后应变水平显著降低。利用DIC对裂纹扩展过程进行了动态观察,成功地获得了裂纹起裂载荷,验证了裂纹起裂过程中的大变形。与HDPE试样的光滑断裂面相比,scfrtc试样的断裂面要粗糙得多,存在明显的桥接SCFs。断裂面的比表面积和桥接SCFs越大,scfrtc试样在断裂过程中吸收的能量就越大,这就解释了scfrtc断裂韧性的提高。
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来源期刊
CiteScore
3.00
自引率
0.00%
发文量
30
审稿时长
4.5 months
期刊介绍: Multiscale characterization, modeling, and experiments; High-temperature creep, fatigue, and fracture; Elastic-plastic behavior; Environmental effects on material response, constitutive relations, materials processing, and microstructure mechanical property relationships
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