Article
Materials Science, Composites
Maojun Li, Xiaoyang Jiang, Ting Su
Summary: This study investigates the surface quality and mechanical behavior of open-hole composite laminates following different machining processes. The results show that the hole geometrical accuracy and mechanical property are significantly affected by the machining methods, while the influence on strain distribution patterns is limited.
POLYMER COMPOSITES
(2022)
Article
Engineering, Manufacturing
Zhihui Yang, Ya Lu, Wenyuan Li, Chunmeng Chen, Long Chen
Summary: This paper investigates the efficiency of CFRP hole-cutting using a nanosecond laser with a multi-pass scanning strategy. The study examines the differences in material removal mechanisms at different scanning spacing and the impact of scanning spacing on processing efficiency. Results show that material removal is achieved through the combined effect of laser ablation and mechanical erosion, and that the optimal scanning spacing and number of passes can effectively improve processing efficiency. With a repetition frequency of 80 kHz and a pulse energy of 141.25 μJ, the shortest cutting time is 73.3 s with an optimal scanning spacing of 0.06 mm. When compared to a scanning spacing of 0.08 mm and three passes, this configuration is 26.8% more efficient. Additionally, as the laser repetition frequency increases, the optimal scanning spacing for processing efficiency increases while the optimal number of passes decreases.
JOURNAL OF MANUFACTURING PROCESSES
(2023)
Article
Engineering, Civil
Xinghua Chen, Wenyuan Li, Youmin Rong, Guojun Zhang, Long Chen, Yu Huang
Summary: This paper presents an assisted laser cutting technology for carbon fiber reinforced polymer (CFRP) plate using dimethicone, which effectively reduces the heat-affected zone and improves the cutting quality. Through orthogonal experiments, the optimal cutting parameters were determined, resulting in a significant reduction (85.89%) in the heat-affected zone width.
ARCHIVES OF CIVIL AND MECHANICAL ENGINEERING
(2022)
Article
Mechanics
Wenyuan Li, Youmin Rong, Yu Huang, Long Chen, Zhihui Yang, Guojun Zhang
Summary: This paper investigates the dynamic and static mechanical behavior of short pulse laser cutting CFRP and explores the effect of cutting damage on mechanical properties. The study finds that cutting damage weakens the tensile and bending strength of CFRP plate by 11.5% and 6.2% respectively. Furthermore, large cutting damage aggravates tensile fatigue crack propagation and fiber protrusion. The research results provide important insights for damage suppression and improvement of material mechanical properties.
ENGINEERING FRACTURE MECHANICS
(2023)
Review
Mechanics
Yang Song, Huajun Cao, Wei Zheng, Da Qu, Lei Liu, Chunping Yan
Summary: This article provides a detailed review and discussion of various types of cutting force models for carbon fiber reinforced polymer (CFRP) composites, including their development and future trends.
COMPOSITE STRUCTURES
(2022)
Article
Mechanics
Guoyi Hou, Bin Luo, Kaifu Zhang, Yingxin Luo, Hui Cheng, Sipeng Cao, Yuan Li
Summary: The study found that heat accumulation during thick CFRP drilling may result in severe damages, but the specific cutting mechanism is still unclear.
COMPOSITE STRUCTURES
(2021)
Article
Mechanics
Long Chen, Yu Huang, Wenyuan Li, Ranwu Yang, Xinhua Chen, Guojun Zhang, Youmin Rong
Summary: Acoustic emission (AE) technology is utilized to analyze the mechanism and evaluate the size of the heat-affected zone (HAZ) in laser cutting of carbon fiber-reinforced plastics (CFRP). The frequency distribution and root-mean-square (RMS) characteristics of AE signals provide valuable information about laser ablation and denudation.
COMPOSITE STRUCTURES
(2023)
Article
Engineering, Multidisciplinary
Wenyuan Li, Youmin Rong, Yu Huang, Xinghua Chen, Long Chen, Guojun Zhang
Summary: This paper proposes a new compound cutting method to regulate the surface damage of CFRP during laser cutting process, effectively improving the processing quality and mechanical properties of CFRP.
COMPOSITES PART B-ENGINEERING
(2023)
Article
Materials Science, Multidisciplinary
Igor Vysotskiy, Sergey Malopheyev, Ivan Zuiko, Sergey Mironov, Rustam Kaibyshev
Summary: In this study, EBSD was used to investigate the microstructure distribution within the selective-laser-melted 17-4 PH martensitic steel. The volume fraction of delta-ferrite decreased in the building direction, which was attributed to a decrease in cooling rate and promoted the delta-ferrite -> austenite -> alpha-martensite transformation sequence.
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
(2022)
Article
Mechanics
Xiaonan Wang, Fuji Wang, Xinghai Jin, Rao Fu, Yu Shi
Summary: A novel material failure model is developed in this study to predict the orthogonal cutting of CFRP. By considering the strain rate effect, the prediction accuracy of the model is improved. The effects of processing conditions on subsurface damage are also evaluated.
COMPOSITE STRUCTURES
(2022)
Article
Optics
Ranwu Yang, Yu Huang, Youmin Rong, Congyi Wu, Weinan Liu, Long Chen
Summary: This article investigates the acoustic emission (AE) signals in the nanosecond ultraviolet laser cutting process of carbon fiber-reinforced polymer and finds a strong correlation between the AE signal and the kerf width (W-Q). By analyzing the AE signal characteristics under different parameters, online monitoring and quality assessment of the cutting process can be achieved.
OPTICS AND LASER TECHNOLOGY
(2022)
Article
Engineering, Civil
Raed Abokwiek, Jamal A. Abdalla, Rami A. Hawileh, Tamer El Maaddawy
Summary: This study experimentally and analytically investigated the efficiency of using NSM-CFRP strips confined with CFRP wraps to strengthen RC columns, showing a significant increase in load-carrying capacity and ductility. An analytical model was developed to predict the strength of NSM-CFRP-strengthened RC columns, validated using experimental results.
JOURNAL OF COMPOSITES FOR CONSTRUCTION
(2021)
Article
Engineering, Multidisciplinary
C. Leone, E. Mingione, S. Genna
Summary: The study investigates laser cutting of Carbon Fibre Reinforced Plastics (CFRP) using high pulse power and short pulse duration, achieving cutting of 1.3 mm-thick sheets with narrow kerfs and limited Heat Affected Zone (HAZ).
COMPOSITES PART B-ENGINEERING
(2021)
Article
Mechanics
La Han, Junjie Zhang, Yuan Liu, Qiumei Gu, Zengqiang Li
Summary: The study reveals the thermal-mechanical coupled material removal mechanisms of CFRP composites under thermal and cryogenic pretreatments in orthogonal cutting through macro-scale finite element simulations. It also investigates the temperature-dependent material characteristics of CFRP, such as cryogenic embrittlement and thermal softening, which have significant impacts on subsequent cutting processes. Additionally, the coupling effect between fiber orientation and pretreatment temperature on CFRP cutting is addressed, providing guidelines for enhancing machinability of CFRP composites.
COMPOSITE STRUCTURES
(2021)
Article
Optics
Maojun Li, Limei Chen, Xujing Yang
Summary: This study explored the feasibility of high-power fiber laser cutting thick CFRP laminates with a single-pass strategy, finding that appropriate laser power and cutting speed can improve surface quality effectively without causing damage due to excessive thermal energy. Successfully cutting through 10.0 mm thick CFRP laminates using high-power fiber laser and single-pass strategy was achieved in the experiment, providing benchmark data for further industrial applications.
OPTICS AND LASER TECHNOLOGY
(2021)
Article
Automation & Control Systems
Xiaogeng Jiang, Zhiwei Cui, Liang Wang, Chang Liu, Maojun Li, Jian Liu, Yu Du
Summary: This research proposes a global quantitative sensitivity analysis method to identify the critical geometric errors of rotation axes. By considering the size and randomness of geometric errors, and introducing specific indexing angles, the coupling effect between different error sources is evaluated, and the variation of the coupling effect of each error component within the traverse of the rotation axes is explored.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2022)
Article
Engineering, Manufacturing
Maojun Li, Zhuoling Wang, Wei Li, Xujing Yang
Summary: In this study, a two-phase finite element model was developed to investigate particle removal mechanisms and surface integrity during milling of SiCp/Al composites. The results showed that compressive residual stress mainly appeared on the machined surface, while tensile residual stress distributed at deeper depth. Different relative positions between tool and particle induced specific particle removal modes and surface defects.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART B-JOURNAL OF ENGINEERING MANUFACTURE
(2022)
Article
Materials Science, Multidisciplinary
Ting Su, Hui Zhou, Rong Wang, Yiwei Chen, Weihao Luo, Maojun Li
Summary: This study investigates the influence of working temperature on the mechanical performance of adhesively bonded CFRP repair of damaged metallic structures. The results show that the best repair effectiveness is achieved at a temperature of 80 degrees C, regardless of the types of original cracks. The failure mode is identified as interfacial failure, and the strength of the repaired structures is mainly affected by the properties of the adhesive.
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
(2023)
Article
Materials Science, Ceramics
Maojun Li, Xiaoyang Jiang, Yajie Chen, Xujing Yang
Summary: Carbon fiber reinforced carbon matrix (carbon/carbon) composites possess high strength in non-oxidizing atmospheres at extremely high temperatures, making them suitable for aerospace structures. However, these composites are difficult to machine due to their anisotropy and heterogeneity. In this study, the drilling process of three-dimensional braided carbon/carbon composites was investigated, revealing the effects of fiber orientation on material removal mechanisms and tool wear. The results showed that fiber tearing, burrs, uncut fibers, and delamination occurred during drilling, and abrasive particle wear, pullout, and fracture were the main tool wear mechanisms.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Multidisciplinary
Xiaodong Zhang, Hui Zhou, Bowen Zhou, Rong Wang, Haobo Han, Xiaoyang Jiang, Maojun Li
Summary: This paper investigates the feasibility of laser cutting SiCp/Al composites with high volume fraction of SiC particles under different processing parameters. The results show that high specific energy is the most significant factor affecting surface quality during laser cutting SiCp/Al composites. The experimental results can provide new knowledge and data for applying high-power fiber laser in the automotive/aerospace industry.
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
(2023)
Article
Green & Sustainable Science & Technology
Maojun Li, Dingxiao Huang, Haobo Han, Xujing Yang
Summary: This paper investigates the vibration during high-speed robotic milling of aerospace composite materials using acoustic emission (AE) technique. The energy distribution and maximum amplitude of AE signals gradually concentrate at the rotation frequency of the milling cutter as the spindle speed increases. The occurrence of vibration is clearly characterized by filtering and analyzing the surface topography.
INTERNATIONAL JOURNAL OF PRECISION ENGINEERING AND MANUFACTURING-GREEN TECHNOLOGY
(2023)
Article
Chemistry, Physical
Xiaodong Zhang, Xiaoyang Jiang, Maojun Li, Pan Gong
Summary: Form-grinding trials were conducted on transmission gears made of 20Cr2Ni4A alloy under various parameters. The study comprehensively investigated the surface morphology, surface roughness distribution, and microstructure evolution of the machined surface layer, and explored the influence of grinding parameters on grinding performance. The mechanisms behind the formation of surface/subsurface defects during the form-grinding process were analyzed, including plastic flow, deep grooves, successive crushing zone, adhesive chips, and cavities. The results revealed that changes in contact conditions and the application of mechanical force and grinding heat had significant effects on the surface roughness and microstructure refinement of the machined surface layer.
Article
Engineering, Manufacturing
Maojun Li, Xiaoyang Jiang, Dingxiao Huang
Summary: Robotic machining is feasible for cutting composites in aviation manufacturing, but surface damage and chatter during robotic drilling process can significantly affect the geometrical accuracy of assembled structure. This study conducted robotic drilling trials on CFRP composites with different parameters and analyzed the relationship between acoustic emission signals and defect characteristics. The findings showed that matrix cracking, delamination, and fiber failure during robotic drilling process were highly related to specific AE frequencies.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART B-JOURNAL OF ENGINEERING MANUFACTURE
(2023)
Article
Chemistry, Physical
Xiaoyang Jiang, Ke Liu, Mingda Si, Maojun Li, Pan Gong
Summary: This study comprehensively analyzed the grinding force, surface morphology, and surface roughness when grinding 17CrNi2MoVNb alloy using alumina and CBN grinding wheels. Results showed that the CBN wheel had only about 67% of the maximum normal grinding force compared to the alumina wheel. The surface defects on the ground surface were mainly cavities and material tearing when using an alumina grinding wheel. The information from this work could provide benchmark data and references for optimizing grinding tools and parameters in the vehicle industry.
Article
Engineering, Manufacturing
Maojun Li, Ting Su, Xiangchen Lin
Summary: The study investigated the effects of machining strategies on the cutting of thick CFRP/aluminum stacks using abrasive waterjet. The results showed that the kerf geometry and profile were influenced by the processing parameters and stacking configuration. The kerf width increased significantly with higher power-to-speed ratio before reaching the threshold value. V and X shaped kerf profiles were formed on CFRP/Al and Al/CFRP stacks respectively.
CIRP JOURNAL OF MANUFACTURING SCIENCE AND TECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
Maojun Li, Yajie Chen, Mingbo Tan, Xujing Yang, Zhi Xiao
Summary: This study investigated the effect of machining parameters on the surface morphology and defects in threedimensional carbon/carbon ceramic matrix composites during slotting. The mechanisms of burr and uncut fiber formation were discussed based on the relationship between grinding and fiber directions. Acoustic emission signals were analyzed to capture the energy and frequency characteristics of the slotting process. The material removal and tool wear mechanisms were examined through SEM micrographs, revealing the primary material removal mechanisms and the damage suffered by abrasive particles.
DIAMOND AND RELATED MATERIALS
(2023)
Article
Engineering, Manufacturing
Maojun Li, Yajie Chen, Xiaoyang Jiang, Xujing Yang
Summary: This study investigates the effect of machining parameters on the acoustic emission characteristics in grinding three-dimensional carbon/carbon ceramic matrix composites. It was found that grinding speed and grinding depth are the main influencing factors on the RMS values of the acoustic emission signals. The material removal mechanisms were studied through SEM micrographs, showing that fiber fracture and debonding are the main modes of material removal in point grinding carbon/carbon composites.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART B-JOURNAL OF ENGINEERING MANUFACTURE
(2023)
Article
Chemistry, Physical
Rong Wang, Size Peng, Bowen Zhou, Xiaoyang Jiang, Maojun Li, Pan Gong
Summary: This study investigates the effects of grinding allowance allocation on surface morphology, grinding temperature, microstructure, surface roughness, and microhardness fluctuation during the form grinding of 20Cr2Ni4A gears. The results indicate that allowance allocation has a significant influence on the final grinding effect, and the proposed grinding strategy is validated in practical manufacturing.
Article
Engineering, Manufacturing
Xiaodong Zhang, Maojun Li, Dingxiao Huang
Summary: In this study, acoustic emission (AE) technology was used to investigate the characteristics of AE signals during drilling of CFRP/Al stacks. The results showed that time-frequency diagram and RMS curve of AE signals could accurately distinguish different stages of drilling process, and AE signals were significantly correlated with machined surface quality.
JOURNAL OF MANUFACTURING PROCESSES
(2023)
Article
Materials Science, Multidisciplinary
Wei Li, Shiqiang Xie, Zhengyang Deng, Dongbo Zhou, Maojun Li, Xudong Guo, Wei Tang
Summary: This study proposes a mechanical and mechanochemical synergistic micro-grinding technology for efficient and high-quality grinding of hard and brittle materials, specifically fused silica micro parts. Compounded abrasive micro-grinding tools with diamond and cerium oxide abrasives are utilized to achieve initial grinding and subsequent ultra-precision processing for surface or subsurface damage removal. The study presents analysis on contact model, abrasive layer wear mechanism, formulation of cerium oxide abrasive layer, and material removal mechanisms during mechanochemical grinding. The results demonstrate high material removal rate and improved surface roughness, indicating the promising potential of this technique for grinding fused silica.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
