Article
Mechanics
Guowei Chen, Hongyun Luo
Summary: Epoxy foam composites reinforced by unidirectional bamboo fibers were tested for mechanical properties using a tensile test. Fracture morphology was observed using environmental scanning electron microscopy (ESEM) and fracture behaviors were quantitatively analyzed through acoustic emission (AE). Results showed that the fiber reinforced foam (FRF) composites exhibited significantly higher strength and toughness compared to the unfilled epoxy foam (PF), with increases of 131.3% and 223.5%, respectively. The main failure mechanism of FRF during the fracture process was the delamination of the porous matrix covering the fiber interface, accounting for 72.2% of the total failure. Fiber dissociation and breakage accounted for 19.6% and 8.2%, respectively. The study investigated the structure-property relationships using AE and fractography, and discussed strategies for the reinforcement and toughening of porous polymer composites.
EUROPEAN JOURNAL OF MECHANICS A-SOLIDS
(2023)
Article
Materials Science, Multidisciplinary
Yubo Jiao, Lijun Xu, Xiao Han, Hua Yang, Menghan Fang, Jun Cao
Summary: This study investigated the flexural and fracture characteristics of UHPGC notched beams and monitored the damage evolution processes using acoustic emission technology. The results revealed that the notched position significantly affects the flexural strength, toughness, and fracture energy, as well as the acoustic emission parameters and cracking patterns.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Agricultural Engineering
Fuli Wang, Shicheng Ding, Yijun Wu, Chenxing Zhang, Tingting Zhang, Zhuoping Shao, Yong Guo, Yuxia Chen, Huimei Xie, E. Zhang
Summary: This study investigates the contribution of bamboo node to the bending performance of bamboo using experiment and finite element modeling. The results show that bamboo node enhances the resistance ability and changes fracture modes, which is significant for rational utilization of bamboo and innovative design of high strength and toughness composites.
INDUSTRIAL CROPS AND PRODUCTS
(2023)
Article
Mechanics
Yubo Jiao, Menghan Fang, Xiao Han, Hua Yang
Summary: An ecological ultra-high-performance glass sand concrete (UHPGC) was prepared by partially replacing quartz sand in traditional ultra-high-performance concrete (UHPC) with glass sand recycled from waste glass. The effects of different notch-depth ratios on the flexural and fracture performances of UHPGC notched beams were investigated. Acoustic emission (AE) monitoring was used to analyze the energy release during the fracture processes, and wavelet entropy was employed to predict the peak load.
ENGINEERING FRACTURE MECHANICS
(2023)
Article
Construction & Building Technology
Zhenyu Qiu, Mei Yan, Yunze Yang, Jiaxin Li, Wenli Zhu, Hualin Fan
Summary: The study found that wrapping CFRP sheets around the Laminated bamboo arch can effectively enhance its load carrying capacity, with a maximum improvement of 26.54%. It is especially crucial to wrap the vault for maximizing the strengthening effect.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Agricultural Engineering
Xinxin Ma, Zhiqiang Luo, Cong Hui Ji, Liping Cai, Benhua Fei
Summary: This study investigates the creep property of bamboo, exploring its microstructure, bending flexural property, and creep behavior. The study finds that the creep deflection of bamboo is influenced by loading direction and humidity, and that the creep property of bamboo is related to its structural characteristics.
INDUSTRIAL CROPS AND PRODUCTS
(2022)
Article
Construction & Building Technology
Liuxu Fu, Yubo Jiao, Xianhua Chen
Summary: Fibers have been shown to significantly improve the strength of asphalt mixtures, delaying the main fracture occurrence after their addition. Steel fiber reinforced asphalt mixture exhibited better anti-cracking performance compared to glass fiber reinforced and basalt fiber reinforced asphalt mixtures, as indicated by comprehensive AE signal analysis.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Forestry
Xiu Hao, Yanglun Yu, Chunmei Yang, Wenji Yu
Summary: This paper investigates the fracture toughness and enhancement mechanism of bamboo-based composites at the cellular level. In situ characterization techniques were used to identify fracture behaviors and visualize crack propagation. Mechanical properties and nanoindentation tests were performed to illustrate the improvement mechanism. The results showed that bamboo-based composites exhibited longer deformation and higher bending load compared to bamboo, and the fracture was non-catastrophic with tortuous crack propagation. The primary mechanisms responsible for fracture toughness were the crosslinks of phenol-formaldehyde resin with cell walls and massive fibers in the composites.
Article
Mechanics
Chengyang Liu, Mingxi Liu, Wen Liu, Zhi Li, Feng Xu
Summary: This study investigates the different fracture performances and fiber distributions between bamboo internode and bamboo node. The results show that bamboo internode specimens with higher fiber contents tend to exhibit higher fracture energy. However, bamboo node specimens have much strengthened fracture performance compared to internode specimens with the same fiber contents, due to the radial fibers distributing in the bamboo node.
COMPOSITE STRUCTURES
(2022)
Article
Chemistry, Multidisciplinary
Tingyou Yi, Hua Wang, Juntao Xie, Wensheng Wang
Summary: In this study, steel bar reactive powder concrete (SBRPC) was prepared using steel bars and the effect of the number of steel bars on flexural strength was investigated. The results showed that increasing the number of steel bars gradually increased the flexural strength of SBRPC. Acoustic emission (AE) was used to monitor the fracture process in real time and analyze the cracks mode and fracture mode.
APPLIED SCIENCES-BASEL
(2021)
Article
Environmental Sciences
Zhenlong Zhao, Hongwen Jing, Xinshuai Shi, Jiangyu Wu, Qian Yin
Summary: The study found that the uniaxial compressive strength, elasticity modulus, and peak strain of rock are significantly dependent on strain rate. Different strain rates result in varying failure modes and acoustic emission characteristics in rock, while the microscopic fracture morphology plays a crucial role in rock mechanical behaviors.
ENVIRONMENTAL EARTH SCIENCES
(2021)
Article
Polymer Science
Maria E. Vallejos, Roberto J. Aguado, Ramon Morcillo-Martin, Jose A. Mendez, Fabiola Vilaseca, Quim Tarres, Pere Mutje
Summary: The growing demand for plant fiber-reinforced composites presents opportunities to compete against glass fiber-reinforced composites. This study focuses on the production and flexural strength of composites made from polypropylene and hemp strands, using maleic anhydride-grafted PP as a compatibilizer. The calculations and results suggest that the use of MAPP at a dosage of 0.06 g per gram of fiber achieved the maximum enhancement in flexural strength.
Article
Chemistry, Physical
Md. Safiuddin, George Abdel-Sayed, Nataliya Hearn
Summary: This study investigated the flexural and impact performance of mortar composite made with carbon fibers (MCCF). The results showed that increasing the volume content of carbon fibers significantly improved the strength and toughness of the mortar. Among all the samples, the mortar with 3% carbon fibers exhibited the best performance and cost-effectiveness.
Article
Materials Science, Multidisciplinary
Xin Wei, Ge Wang, Lee Miller Smith, Xiaoyi Chen, Huan Jiang
Summary: This study proposes a method to evaluate the gradient distribution and aggregate structure of fibers in bamboo and its impact on flexibility and flexural toughness. The results show that the distribution and structure of fibers are key factors influencing the performance of bamboo, and bamboo exhibits better flexibility and flexural toughness compared to wood.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Materials Science, Textiles
Jayaprakash Sridhar, Ravindran Gobinath, Mehmet Serkan Kirgiz
Summary: In this study, the mechanical characteristics of pre-treated bamboo and jute fiber-reinforced concrete were evaluated, and the performance of fibers in enhancing the strength of concrete was examined. The results showed that concrete with 1.5% bamboo fiber and 2% jute fiber had the highest compressive and flexural strength.
JOURNAL OF NATURAL FIBERS
(2022)
Article
Materials Science, Multidisciplinary
Guowei Chen, Hongyun Luo, Haoyu Yang, Zhiyuan Han, Zhenying Lin, Zheng Zhang, Yuqin Su
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2019)
Article
Chemistry, Physical
Guowei Chen, Hongyun Luo, Zheng Zhang, Xianfeng Fan
COLLOID AND INTERFACE SCIENCE COMMUNICATIONS
(2020)
Review
Engineering, Multidisciplinary
Guowei Chen, Amar K. Mohanty, Manjusri Misra
Summary: PPS/carbon composites have excellent mechanical properties and multifunctionality, suitable for various industries. Bio-carbon has the potential to replace petroleum-based carbon fillers.
COMPOSITES PART B-ENGINEERING
(2021)
Article
Forestry
Ziyu Ba, Guowei Chen, Hongyun Luo, Jun Luo
Summary: In this study, in situ SAXS was used to investigate the thickness evolution of nanocellulose in water, revealing a decrease in nanocellulose thickness and changes in internal bamboo pores. The decrease in nanocellulose thickness was attributed to the expansion and more disordered amorphous zone in lignin and hemicellulose under the influence of water, while the mechanical properties of bamboo increased with increased water content.
WOOD SCIENCE AND TECHNOLOGY
(2021)
Article
Green & Sustainable Science & Technology
Guowei Chen, Hongyun Luo
SUSTAINABLE MATERIALS AND TECHNOLOGIES
(2020)
Article
Polymer Science
Guowei Chen, Arturo Rodriguez-Uribe, Feng Wu, Amar K. Mohanty, Manjusri Misra
Summary: The curing temperature and time have significant effects on the structure and thermal-mechanical properties of PPS, greatly improving its processability in melt extrusion and injection molding processes. This study enhances understanding of the curing process for solid PPS.
JOURNAL OF APPLIED POLYMER SCIENCE
(2022)
Article
Engineering, Manufacturing
Guowei Chen, Arvind Gupta, Tizazu H. Mekonnen
Summary: In this study, ethylene propylene diene monomer (EPDM) bio-composites filled with silane-modified wood fiber were investigated. The results showed that the modified wood fibers reduced water absorption and improved thermal stability, leading to enhanced mechanical properties of the EPDM bio-composites.
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
(2022)
Article
Chemistry, Applied
Guowei Chen, Ali Vahidifar, Steven Yu, Tizazu H. Mekonnen
Summary: The silane modification and subsequent moisture curing of EPDM were optimized using DOE. The optimum moisture-cured Si-EPDM samples showed significant improvements in tensile strength and modulus compared to the pristine EPDM. The cured Si-EPDM even exhibited higher tensile strength than sulphur-vulcanized EPDM. The mechanical properties of the cured Si-EPDM mainly relied on crosslinking density, although excessive crosslinking could have a negative impact on tensile strength.
REACTIVE & FUNCTIONAL POLYMERS
(2023)
Article
Mechanics
Guowei Chen, Hongyun Luo
Summary: Epoxy foam composites reinforced by unidirectional bamboo fibers were tested for mechanical properties using a tensile test. Fracture morphology was observed using environmental scanning electron microscopy (ESEM) and fracture behaviors were quantitatively analyzed through acoustic emission (AE). Results showed that the fiber reinforced foam (FRF) composites exhibited significantly higher strength and toughness compared to the unfilled epoxy foam (PF), with increases of 131.3% and 223.5%, respectively. The main failure mechanism of FRF during the fracture process was the delamination of the porous matrix covering the fiber interface, accounting for 72.2% of the total failure. Fiber dissociation and breakage accounted for 19.6% and 8.2%, respectively. The study investigated the structure-property relationships using AE and fractography, and discussed strategies for the reinforcement and toughening of porous polymer composites.
EUROPEAN JOURNAL OF MECHANICS A-SOLIDS
(2023)
Article
Polymer Science
Dylan Jubinville, Guowei Chen, Tizazu H. Mekonnen
Summary: HDPE was analyzed after being reprocessed multiple times to simulate recycling, and the effect on its properties was determined. HPCs were fabricated by compounding HP with recycled HDPE, and maleated HDPE was added as a compatibilizer. The recycling process resulted in crosslinking reactions and changes in viscosity, while maintaining the molecular weight. The addition of hemp content led to improvements in tensile modulus, but also increased water absorption. However, after compatibilization, all mechanical properties improved and water absorption decreased significantly.
POLYMER DEGRADATION AND STABILITY
(2023)
Article
Energy & Fuels
Kikaoseh Agweh, Michael R. R. Snowdon, Ranjeet Kumar Mishra, Guowei Chen, Singaravelu Vivekanandhan, Amar K. K. Mohanty, Manjusri Misra
Summary: The waste stream of nutshell shells, including pine nut shells, walnut shells, and almond shells, were converted into biocarbon materials through slow pyrolysis. The pyrolysis temperature was found to have a significant impact on the yield and properties of the biocarbon. Biocarbon prepared at higher temperatures exhibited better characteristics for material applications.
BIOMASS CONVERSION AND BIOREFINERY
(2023)
Article
Materials Science, Composites
Guowei Chen, Michael R. Snowdon, Amar K. Mohanty, Manjusri Misra
Summary: Sustainable hybrid fillers, including BioC and rCF, are used to strengthen PPS. The PPS biocomposites were compared with traditional talc-filled counterparts. The PPS/BioC/rCF biocomposites have similar mechanical properties and thermal stability to PPS/talc/rCF composites. However, the former has a higher content of sustainable fillers, providing better energy-saving and emission reduction properties. The biocomposites filled with BioC/rCF exhibit a similar degradation process to talc/rCF counterparts during heat aging. This study can help expand high-end application options of PPS composites reinforced by sustainable carbon fillers, such as Electric Vehicle (EV) parts.
COMPOSITES PART C: OPEN ACCESS
(2023)
Article
Agricultural Engineering
Guowei Chen, Arvind Gupta, Tizazu H. Mekonnen
Summary: Ethylene propylene diene monomer (EPDM) rubber based bio-composites filled with silane-modified wood fiber (SiWF) were foamed by using chemical foaming method, which showed improved water absorption and thermomechanical properties. The addition of dicumyl peroxide (DCP) generated crosslinking in the EPDM bio-composite foams, enhancing tensile and compressive strength and modulus. The developed bio-composite foams exhibited lower apparent thermal conductivity, making them potential insulation materials.
INDUSTRIAL CROPS AND PRODUCTS
(2023)
Article
Polymer Science
Guowei Chen, Ali Vahidifar, Steven Yu, Tizazu H. Mekonnen
Summary: This study evaluates and develops an environmentally-friendly and sulfur-free cured EPDM composite by incorporating silica into silane grafted EPDM (SiEPDM) composites. The results show that a robust bonding between silica and grafted silane is established, resulting in a crosslinking network within the composite structure. The optimized SiEPDM-silica composites exhibit significantly improved tensile strength and tear strength compared to EPDM-silica composites. Additionally, the SiEPDM-silica composites demonstrate exceptional UV stability.
MACROMOLECULAR RAPID COMMUNICATIONS
(2023)
Article
Materials Science, Composites
Xuezhe Chen, Jiali Chen, Bin Shen, Wenge Zheng
Summary: In this study, high-performance EPEI/CNS composite foams were fabricated using subcritical foaming technology and CNS dip-coating. These composite foams exhibited efficient EMI shielding and high-temperature resistance with low CNS loading.
COMPOSITES COMMUNICATIONS
(2024)
