Progressive Failure and Energy Absorption of Chopped Bamboo Fiber Reinforced Polybenzoxazine Composite under Impact Loadings
As a type of environmentally-friendly and low-cost natural material, bamboo fibers exhibit excellent mechanical properties. In this study, a bamboo fiber reinforced polybenzoxazine composite was fabricated by an improved hot-pressing process. The dynamic compressive behaviors of neat benzoxazine and...
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doaj-e3c278b483b042dba32e05859a62b4c82020-11-25T03:27:17ZengMDPI AGPolymers2073-43602020-08-01121809180910.3390/polym12081809Progressive Failure and Energy Absorption of Chopped Bamboo Fiber Reinforced Polybenzoxazine Composite under Impact LoadingsKai Zhang0Yongyang Sun1Fangxin Wang2Wenyan Liang3Zhenqing Wang4College of Aerospace and Civil Engineering, Harbin Engineering University, Harbin 150001, ChinaCollege of Aerospace and Civil Engineering, Harbin Engineering University, Harbin 150001, ChinaCollege of Aerospace and Civil Engineering, Harbin Engineering University, Harbin 150001, ChinaCollege of Aerospace and Civil Engineering, Harbin Engineering University, Harbin 150001, ChinaCollege of Aerospace and Civil Engineering, Harbin Engineering University, Harbin 150001, ChinaAs a type of environmentally-friendly and low-cost natural material, bamboo fibers exhibit excellent mechanical properties. In this study, a bamboo fiber reinforced polybenzoxazine composite was fabricated by an improved hot-pressing process. The dynamic compressive behaviors of neat benzoxazine and its composite were comparatively studied by an SHPB (split Hopkinson pressure bar) apparatus. SHPB tests showed that the benzoxazine matrix and its composite exhibited significantly positive strain rate sensitivity at nominal strain rates in the range of 0.006–2500/s. During the impact loadings, the progressive deformation and failure of neat benzoxazine and bamboo composite were investigated by capturing real-time images with a high-speed camera. In comparison with neat benzoxazine, the bamboo composite had slightly higher maximum compressive stress under the same strain rates. It is noteworthy that the crashworthiness of the composite was remarkably better than that of neat benzoxazine due to the incorporation of bamboo fibers. For example, the energy absorption of bamboo composite was 105.7% higher than that of neat benzoxazine at a strain rate of 2500/s. The dynamic compressive properties of benzoxazine resin were much better than most of the conventional thermosetting resins. These results could guide the future application of this kind of composites.https://www.mdpi.com/2073-4360/12/8/1809bamboo fiberbenzoxazine resinstrain rate effectmechanical propertiesprogressive failureenergy absorption |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Kai Zhang Yongyang Sun Fangxin Wang Wenyan Liang Zhenqing Wang |
spellingShingle |
Kai Zhang Yongyang Sun Fangxin Wang Wenyan Liang Zhenqing Wang Progressive Failure and Energy Absorption of Chopped Bamboo Fiber Reinforced Polybenzoxazine Composite under Impact Loadings Polymers bamboo fiber benzoxazine resin strain rate effect mechanical properties progressive failure energy absorption |
author_facet |
Kai Zhang Yongyang Sun Fangxin Wang Wenyan Liang Zhenqing Wang |
author_sort |
Kai Zhang |
title |
Progressive Failure and Energy Absorption of Chopped Bamboo Fiber Reinforced Polybenzoxazine Composite under Impact Loadings |
title_short |
Progressive Failure and Energy Absorption of Chopped Bamboo Fiber Reinforced Polybenzoxazine Composite under Impact Loadings |
title_full |
Progressive Failure and Energy Absorption of Chopped Bamboo Fiber Reinforced Polybenzoxazine Composite under Impact Loadings |
title_fullStr |
Progressive Failure and Energy Absorption of Chopped Bamboo Fiber Reinforced Polybenzoxazine Composite under Impact Loadings |
title_full_unstemmed |
Progressive Failure and Energy Absorption of Chopped Bamboo Fiber Reinforced Polybenzoxazine Composite under Impact Loadings |
title_sort |
progressive failure and energy absorption of chopped bamboo fiber reinforced polybenzoxazine composite under impact loadings |
publisher |
MDPI AG |
series |
Polymers |
issn |
2073-4360 |
publishDate |
2020-08-01 |
description |
As a type of environmentally-friendly and low-cost natural material, bamboo fibers exhibit excellent mechanical properties. In this study, a bamboo fiber reinforced polybenzoxazine composite was fabricated by an improved hot-pressing process. The dynamic compressive behaviors of neat benzoxazine and its composite were comparatively studied by an SHPB (split Hopkinson pressure bar) apparatus. SHPB tests showed that the benzoxazine matrix and its composite exhibited significantly positive strain rate sensitivity at nominal strain rates in the range of 0.006–2500/s. During the impact loadings, the progressive deformation and failure of neat benzoxazine and bamboo composite were investigated by capturing real-time images with a high-speed camera. In comparison with neat benzoxazine, the bamboo composite had slightly higher maximum compressive stress under the same strain rates. It is noteworthy that the crashworthiness of the composite was remarkably better than that of neat benzoxazine due to the incorporation of bamboo fibers. For example, the energy absorption of bamboo composite was 105.7% higher than that of neat benzoxazine at a strain rate of 2500/s. The dynamic compressive properties of benzoxazine resin were much better than most of the conventional thermosetting resins. These results could guide the future application of this kind of composites. |
topic |
bamboo fiber benzoxazine resin strain rate effect mechanical properties progressive failure energy absorption |
url |
https://www.mdpi.com/2073-4360/12/8/1809 |
work_keys_str_mv |
AT kaizhang progressivefailureandenergyabsorptionofchoppedbamboofiberreinforcedpolybenzoxazinecompositeunderimpactloadings AT yongyangsun progressivefailureandenergyabsorptionofchoppedbamboofiberreinforcedpolybenzoxazinecompositeunderimpactloadings AT fangxinwang progressivefailureandenergyabsorptionofchoppedbamboofiberreinforcedpolybenzoxazinecompositeunderimpactloadings AT wenyanliang progressivefailureandenergyabsorptionofchoppedbamboofiberreinforcedpolybenzoxazinecompositeunderimpactloadings AT zhenqingwang progressivefailureandenergyabsorptionofchoppedbamboofiberreinforcedpolybenzoxazinecompositeunderimpactloadings |
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