Progressive Failure and Energy Absorption of Chopped Bamboo Fiber Reinforced Polybenzoxazine Composite under Impact Loadings
Abstract
:1. Introduction
2. Experimental Section
2.1. Materials
2.2. Pretreatment of Bamboo Fibers
2.3. Composite Preparation
2.4. Quasistatic Compression Test
2.5. Impact Tests
3. Results and Discussion
3.1. Quasistatic Compressive Behaviors of the Neat Benzoxazine and ABP
3.2. Dynamic Compressive Tests
3.2.1. Validation
3.2.2. Compressive Behaviors of the Neat Benzoxazine and ABP
3.3. Strain Rate Effect
3.4. Energy Absorption
4. Conclusions
- The hardening stage of the composite under quasistatic compression disappeared due to the incorporation of chopped bamboo fibers. There were no softening and hardening stages of the neat benzoxazine under dynamic loadings, and both the matrix and the composite became more brittle with the increase of the strain rates.
- The bamboo fibers exhibited positive effects on the impact toughness of the composite under dynamic loading conditions. However, the stiffness and strength of the composite were still controlled by the benzoxazine matrix. This was because the direction of the fiber distribution and the high tensile strength of the bamboo fibers could not be utilized effectively.
- The maximum compressive stresses of the benzoxazine resin were 204 MPa, 287 MPa, 504 MPa, and 578 MPa at nominal strain rates of 0.006/s, 1250/s, 1650/s, and 2500/s, respectively. The high strength of the benzoxazine resin demonstates huge potential in fields of impact engineering.
- The chopped bamboo fibers could prevent the rapid propagation of microcracks in the matrix to some extent, which greatly enhanced the energy absoption the composite under high-speed impact loadings.
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
References
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Nominal Strain Rate (s−1) | Maximum Stress (MPa) | |
---|---|---|
Neat Benzoxazine | ABP | |
Quasistatic | 204.3 ± 2.1 | 175 ± 1.6 |
1250 | 287 ± 5.2 | 331 ± 6.8 |
1650 | 504 ± 6.4 | 563 ± 5.5 |
2500 | 578 ± 6.7 | 615 ± 5.1 |
2800 | 539 ± 7.5 | 565 ± 7.2 |
Nominal Strain Rate (s−1) | Absorbed Energy (J) | |
---|---|---|
Neat Benzoxazine | ABP | |
1250 | 4.1 ± 0.6 | 5.2 ± 0.7 |
1650 | 7.5 ± 1.2 | 14.3 ± 1.9 |
2500 | 8.7 ± 1.4 | 17.9 ± 2.1 |
2800 | 4.6 ± 0.5 | 13.1 ± 2.2 |
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Zhang, K.; Sun, Y.; Wang, F.; Liang, W.; Wang, Z. Progressive Failure and Energy Absorption of Chopped Bamboo Fiber Reinforced Polybenzoxazine Composite under Impact Loadings. Polymers 2020, 12, 1809. https://doi.org/10.3390/polym12081809
Zhang K, Sun Y, Wang F, Liang W, Wang Z. Progressive Failure and Energy Absorption of Chopped Bamboo Fiber Reinforced Polybenzoxazine Composite under Impact Loadings. Polymers. 2020; 12(8):1809. https://doi.org/10.3390/polym12081809
Chicago/Turabian StyleZhang, Kai, Yongyang Sun, Fangxin Wang, Wenyan Liang, and Zhenqing Wang. 2020. "Progressive Failure and Energy Absorption of Chopped Bamboo Fiber Reinforced Polybenzoxazine Composite under Impact Loadings" Polymers 12, no. 8: 1809. https://doi.org/10.3390/polym12081809