Mechanical Response and Failure Mechanisms of Natural Bamboo Fiber Reinforced Poly-Benzoxazine Composite Subjected to Split-Hopkinson Tensile Bar Loading
Abstract
:1. Introduction
2. Experimental Section
2.1. Materials
2.2. Composite Preparation
2.3. Quasi-Static Tensile Test
2.4. Impact Tests
2.5. SEM Observation
3. Results and Discussion
3.1. Tensile Behaviors of the Neat Benzoxazine and Its Composite under Quasi-Static Loading
3.2. Tensile Behaviors of the Neat Benzoxazine and Its Composite under SHTB Loading
3.3. Rate Dependence of Tensile Behavior of Neat Benzoxazine and Its Composite
3.4. Failure Mechanisms
4. Conclusions
- The chopped bamboo fibers could not increase the tensile strength of the composite under quasi-static loading conditions. However, the results showed the composite exhibited 30.02% and 25.21% higher strength than that of neat benzoxazine under the strain rate of 35/s and 110/s, respectively.
- The tensile behavior of the composite under quasi-static loading was mainly controlled by the potential defects (such as small bubbles, pores, and fiber agglomerations) in the composite.
- Under SHTB loadings, the chopped bamboo fibers exhibited obvious positive effects on the dynamic tensile properties of the composite. The potential defects in the composite may have not enough time to develop due to the extremely high strain rates. The neat benzoxazine and its composite displayed a positive strain rate effect.
- With the increase in strain rates, fiber breakage, fiber split, and river lines could be observed on the fracture surface of the composite. Compared with the specimen under quasi-static loading, much more broken bamboo fibers were exposed on the fracture surface. The existence of bamboo fibers could effectively hinder the rapid propagation of cracks in the composite.
- The chopped bamboo fibers were proven to exhibit positive effects on the dynamic mechanical properties of the composite. This demonstrated plant fibers could be used in the impact engineering field. However, further research is needed for studying the strain rate effects of plant fibers.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Strain Rate (s−1) | Ultimate Stress (MPa)/Strain (%) | ||
---|---|---|---|
Neat Benzoxazine | ABP | ||
0.001 | 20.5 ± 1.3/1.16 ± 0.11 | 20.6 ± 1.1/0.94 ± 0.13 | |
35 | 46.3 ± 3.2/0.52 ± 0.08 | 60.2 ± 5.8/0.41 ± 0.09 | |
110 | 59.5 ± 3.3/0.34 ± 0.07 | 74.5 ± 4.5/0.24 ± 0.08 |
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Zhang, K.; Wang, F.; Yang, B.; Li, L.; Gao, L.; Sun, Y.; Guo, F. Mechanical Response and Failure Mechanisms of Natural Bamboo Fiber Reinforced Poly-Benzoxazine Composite Subjected to Split-Hopkinson Tensile Bar Loading. Polymers 2022, 14, 1450. https://doi.org/10.3390/polym14071450
Zhang K, Wang F, Yang B, Li L, Gao L, Sun Y, Guo F. Mechanical Response and Failure Mechanisms of Natural Bamboo Fiber Reinforced Poly-Benzoxazine Composite Subjected to Split-Hopkinson Tensile Bar Loading. Polymers. 2022; 14(7):1450. https://doi.org/10.3390/polym14071450
Chicago/Turabian StyleZhang, Kai, Fangxin Wang, Bin Yang, Lin Li, Li Gao, Yongyang Sun, and Fuzheng Guo. 2022. "Mechanical Response and Failure Mechanisms of Natural Bamboo Fiber Reinforced Poly-Benzoxazine Composite Subjected to Split-Hopkinson Tensile Bar Loading" Polymers 14, no. 7: 1450. https://doi.org/10.3390/polym14071450