Influence of Bamboo Fibers Weight Fraction on the Quasi-Static and Dynamic Compressive Responses of Epoxy Matrix Composites

ABSTRACT

The influences of natural bamboo fibers (BFs) weight fraction on the microstructure, quasi-static and dynamic compressive responses of the epoxy resin matrix composites were investigated with the aid of scanning electron microscope, electronic universal testing machine and the modified Split Hopkinson pressure bar (SHPB) setup. The quasi-static compressive properties of the BFs/epoxy resin matrix composites suggested that the compressive strength were strongly improved with the addition of the natural BFs, which was attributed to the excellent strengthening effect. When the BFs content increased up to 15 wt.%, the compression ratio of the BFs/epoxy resin matrix composites showed 11% reduction than that of the unmodified epoxy resin. Moreover, the stress and strain were linear at the initial part but nonlinear when stress exceeds a certain value. SHPB impact tests results indicated that, compared with the pristine epoxy resin, the natural BFs reinforced epoxy matrix composite with 15 wt.% BFs exhibited the highest dynamic compressive strength, compression modulus and the best strengthening effect. Epoxy resin matrix composites also showed an obvious effect rate effective under impact load. Similar to that in the quasi-static compressive test, the addition of natural BFs has a positive effect in improving the compressive strength of the epoxy matrix.

摘要

利用扫描电子显微镜、电子万能试验机和改进的Split Hopkinson压杆装置，研究了天然竹纤维对环氧树脂微观结构、准静态和动态压缩响应的影响. BFs/环氧树脂基复合材料的准静态压缩性能表明，天然BFs的加入大大提高了复合材料的抗压强度，这归因于其优异的强化效果. 当BFs含量增加到15 wt%时，BFs/环氧树脂基复合材料的压缩比比未改性的环氧树脂降低了11%. 此外，应力和应变在初始部分是线性的，但当应力超过一定值时是非线性的. SHPB冲击试验结果表明，与原始环氧树脂相比，添加15 wt%BFs的天然BFs增强环氧基复合材料表现出最高的动态抗压强度、压缩模量和最佳的增强效果. 环氧树脂基复合材料在冲击载荷作用下也表现出明显的效应率. 与准静态抗压试验类似，添加天然BFs对提高环氧树脂基体的抗压强度有积极作用.

KEYWORDS:

• Epoxy matrix composites
• natural bamboo fibers
• dynamic compressive responses
• quasi-static compressive experiment

关键词:

• 环氧树脂基复合材料
• 天然竹纤维
• 动态压缩响应
• 准静态压缩实验

Highlights

• Epoxy matrix composites reinforced by KH560 modified natural bamboo fibers were prepared

• The quasi-static compressive behaviors have been greatly improved

• BFs/epoxy resin matrix composites are sensitive to the strain rate

• The modified natural bamboo fibers have good strengthening effects

• Dynamic compressive properties are also influenced by the natural bamboo fibers

Acknowledgements

This work was supported by the Key Program for the Education Department of Anhui Province, Grant number KJ2020A0282; the Natural Science Foundation of Anhui Province Education Department, Grant number KJ2019A0127.

Disclosure statement

No potential conflict of interest was reported by the author(s).

Ethical approval

The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

Additional information

Funding

This work was supported by the Key Program for the Education Department of Anhui Province, Grant number KJ2020A0282; Natural Science Foundation of Anhui Province Education Department, Grant number KJ2019A0127.