Article
Engineering, Aerospace
Gruhalakshmi Yella, Prakash Jadhav, Chhaya Lande
Summary: Bird strikes are a major concern for airlines worldwide, especially for aircraft engine fan blades. Simulations can be used to explore strategies to minimize the impact of bird strikes on jet engines through proper design and manufacturing processes. This study suggests using hybrid composite blades with two types of fibers to address delamination issues. Validation tests and dynamic analysis were conducted to investigate the impact behavior of a rectangular plate subjected to a bird strike. The research focuses on analyzing bird strikes on hybrid composite fan blades, particularly the impact position and joint region length of the materials. The results indicate that a joint region with 40% length of glass composite shows the optimal level of normalized interlaminar shear strain in all impact locations.
Article
Mechanics
Lulu Liu, Hongyan Shao, Xinying Zhu, Zihao Zhao, Gen Zhang, Gang Luo, Wei Chen
Summary: This study used gelatin to simulate bird projectiles and conducted impact experiments on composite blades. The damage mechanism and impact energy thresholds of the blades were explored through numerical simulations and experimental results.
COMPOSITE STRUCTURES
(2023)
Article
Engineering, Mechanical
Gruhalakshmi Yella, Prakash Jadhav
Summary: The fan blades of an aircraft engine are crucial components, but bird strikes have always posed a problem. Finite element analysis can optimize blade design to minimize the impact of bird strikes. This research proposes using two fibers instead of one for the blades and focuses on designing proper fiber joints. Static and dynamic analysis are performed to identify the best joint configurations to prevent delamination.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART C-JOURNAL OF MECHANICAL ENGINEERING SCIENCE
(2023)
Article
Engineering, Aerospace
Yong Chen, Lu Jin, Xu Tang, Dandan Huang, Jiguo Zhang
Summary: This study conducted dynamic response measurements of a composite fan blade using multiple MFC actuators to study its vibration characteristics. The results showed that different combinations of MFC actuators excitation led to significant differences in blade response and could change the high cycle fatigue location.
Article
Engineering, Civil
Lin Shi, Zhenyu Wu, Xiaoying Cheng, Zhongxiang Pan, Yanhong Yuan
Summary: This paper investigates the impact of transverse low-velocity impacts on tubular composites in automobile engineering, comparing the effects of different stacking sequences and weaving structures on impact response. The results show that hybrid tubes exhibit better impact resistance at higher impact energies.
ENGINEERING STRUCTURES
(2021)
Article
Materials Science, Composites
Zhenyu Wu, Kang Wang, Lin Shi, Xiaoying Cheng, Yanhong Yuan
Summary: In this paper, the impact resistance and damage tolerance of triaxial braid structure laminates at different positions were studied. Results showed that the triaxial braided fabric with quasi-isotropic properties on the impact side caused more significant matrix cracks and larger damage areas. The study provided valuable reference for failure analysis and structure optimization of composite laminates.
POLYMER COMPOSITES
(2023)
Article
Engineering, Civil
Yuanyuan Wu, Jinhui Guo, Limeng Xun, Baozhong Sun, Bohong Gu
Summary: This study reports the anisotropic low-velocity impact behaviors of 3D braided carbon fiber/epoxy composites after thermo-oxidative aging. The findings show that the loading in the out-of-plane direction has better resistance to aging degradation and more sensitive stiffness degradation.
THIN-WALLED STRUCTURES
(2023)
Article
Engineering, Civil
Zhongxiang Pan, Feng Qiao, Jiajia Yu, Weihao Ouyang, Zhenyu Wu
Summary: In this study, the localized deformation and damage mechanism of triaxial braided composite tubes were experimentally studied under transverse low-velocity impact with different quantities and positions of axial yarns. It was found that the distribution of axial yarns has a significant effect on the mechanical behavior of the tubes. Increasing the quantity of axial yarns enhanced the bending stiffness and peak force but decreased the impact lasting time and displacement. More axial yarns assembled at the impact side resulted in greater force oscillation, decreased heat generation in small-angle braided tubes, and reduced fiber tows fracture, delamination, and in-plane shear cracks in the wall of large-angle braided tubes.
THIN-WALLED STRUCTURES
(2022)
Article
Mechanics
Hao Zhu, Xiang-bin Du, Dian-sen Li, Lei Jiang
Summary: In this study, a parameterized finite element model was established to investigate the compressive behaviors of 3D braided composites. The results convincingly demonstrated that the compressive behaviors depend significantly on the braiding angle, fiber volume fraction, and loading direction. This study is of great importance for accurately predicting the stiffness degradation and failure strength of the materials.
COMPOSITE STRUCTURES
(2022)
Article
Engineering, Aerospace
Gruhalakshmi Yella, Prakash Jadhav
Summary: Bird strikes have always been a problem for airlines worldwide. To reduce the impact on jet engines, simulation analysis is used to study the use of appropriate design and manufacturing methods. This research suggests using hybrid fiber blades to reduce delamination issues. The results show promising damage-tolerant capabilities under bird strike loading.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART G-JOURNAL OF AEROSPACE ENGINEERING
(2023)
Article
Chemistry, Analytical
Qiangqiang Ren, Zhiwen Lei, Song Hu, Yong Ding, Limo He, Sheng Su, Yi Wang, Long Jiang, Jun Xu, Jun Xiang
Summary: The waste fan blades of wind power machines grow explosively with the machine's lifespan. Developing a new low-carbon emission method to treat and recycle waste fan blades is promising. In this study, a novel photothermal pyrolysis method was developed and applied to treat waste fan blades.
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
(2023)
Article
Mechanics
Yuanhui Gu, Diantang Zhang, Zhongwei Zhang, Jie Sun, Songlin Yue, Gan Li, Kun Qian
Summary: The paper investigates the torsion progressive damage and failure mechanism of two-dimensional braided carbon/epoxy composite tubes with different braiding angles, showing that braiding angle significantly affects torsional mechanical behaviors and damage modes.
COMPOSITE STRUCTURES
(2021)
Article
Materials Science, Composites
Youchao Sun, Yuemei Zhang, Yadong Zhou, Haitao Zhang, Haijun Zeng, Kun Yang
Summary: The study found that changing the boundary condition is the most effective way to obtain desirable impact damages, which is important for further analysis of real fan blade failures.
JOURNAL OF COMPOSITES SCIENCE
(2021)
Article
Engineering, Civil
Tao Liu, Xianyan Wu, Baozhong Sun, Wei Fan, Wanli Han, Honglei Yi
Summary: This paper numerically investigated the impacts of manufacturing defects and braiding angles on the impact compressive properties of 3D carbon fiber/epoxy resin braided composite tubes. The results show that random defects have a negative influence on the compressive failure mechanisms of the braided tubes, and non-ideal models containing appropriate random defects are more accurate in simulating the dynamic compressive failure evolution process.
THIN-WALLED STRUCTURES
(2021)
Article
Multidisciplinary Sciences
Weiliang Zhang, Xupeng Wang, Xiaomin Ji, Xinyao Tang, Fengfeng Liu, Shuwei Liu
Summary: Through analyzing the three-cell model of 3D five-direction circular braiding composite material, it was found that there are different braiding angles between different cells. As the knuckle length increases, the braiding angles of each cell gradually decrease, leading to a decrease in total fiber volume content.
Article
Materials Science, Multidisciplinary
Kailong Xu, Wei Chen, Xinying Zhu, Lulu Liu, Zhenhua Zhao, Gang Luo
Summary: A comprehensive computational micromechanics method is proposed in this study to predict the mechanical properties and failure envelop of materials under bi-axial stress at high temperatures. By employing suitable damage models and fiber placement algorithms, and conducting finite element simulations, detailed analysis results are obtained.
MECHANICS OF ADVANCED MATERIALS AND STRUCTURES
(2023)
Article
Geosciences, Multidisciplinary
Jinsheng Han, Zhenhua Zhao, Pete Hollings, Huayong Chen
Summary: The petrogenesis of the Koktokay No. 3 pegmatite in the Chinese Altai Mountains is still unknown, as it is highly enriched in rare metals and lacks a parental granite. However, the recent discovery of a granite apophysis in the No. 3 pegmatite open pit sheds new light on its origin. The granite apophysis is a highly evolved muscovite albite granite, with similar rare earth element patterns as the No. 3 pegmatite. It is suggested that the Jurassic granite represents a late pulse of magma injected from a deep-seated magma chamber, which overlapped with the early pegmatite and promoted the rare metal mineralization.
GEOLOGICAL SOCIETY OF AMERICA BULLETIN
(2023)
Article
Mechanics
Xinying Zhu, Wei Chen, Lulu Liu, Kailong Xu, Gang Luo, Zhenhua Zhao
Summary: This paper investigates the impact resistance and damage tolerance of 2D triaxially braided composites and 3D angle-interlock woven composites panels using high-velocity impact tests and compression after impact tests. Both materials show similar impact resistance but different damage patterns. X-ray CT scanning reveals the spatial variation in damage morphology caused by high-velocity impact.
COMPOSITE STRUCTURES
(2023)
Article
Materials Science, Multidisciplinary
Xie Zhihao, Chen Wei, Liu Yuyang, Liu Lulu, Zhao Zhenhua, Luo Gang
Summary: This study used a numerical simulation method to investigate the impact resistance mechanism of STF-Kevlar and guide its further design. The results showed that STF-Kevlar had smaller deformation and greater resistance to elastomer compared to neat Kevlar. With increasing impact velocity, STF-Kevlar increasingly relied on STF to absorb energy. This research is important for predicting the ballistic performance, guiding design, and optimization of composite fabrics.
MATERIALS & DESIGN
(2023)
Article
Engineering, Mechanical
Zhenhua Zhao, Ting Li, Dong Cao, Jun Yang
Summary: A new bilateral continuous terminal sliding mode control method is proposed to attenuate high-order time-varying disturbance in teleoperation systems using enhanced nonlinear disturbance observer (ENDOB). The control task is transformed into stabilizing position and force tracking errors. ENDOBs are introduced to estimate the high-order lumped disturbances, and a bilateral continuous terminal sliding mode controller is developed based on the estimation. The proposed method is demonstrated to be effective in a bilateral lift robot system.
NONLINEAR DYNAMICS
(2023)
Article
Chemistry, Multidisciplinary
Zhen-Hua Zhao, Jia-Run Huang, Pei-Qin Liao, Xiao-Ming Chen
Summary: A stable metal-organic framework (DMA)(4)[Sn-2(THO)(2)] with isolated and distorted octahedral SnO62- active sites is reported as an electrocatalyst for electrochemical CO2 reduction reactions. It shows exceptional performance for CH4 production, surpassing most reported copper-based and all non-Cu metal-based catalysts. The isolated SnO62- active site favors the formation of *OCOH species to produce CH4 and inhibits the formation of *OCHO and *COOH species to produce *HCOOH and *CO, respectively.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Chemistry, Multidisciplinary
Yan-Chen Liu, Jia-Run Huang, Zhen-Hua Zhao, Pei-Qin Liao, Xiao-Ming Chen
Summary: A stable metal-azolate framework with cyclic trinickel(II) clusters achieved a high current density of 50 mA cm(-2) at a cell voltage of 1.8V in a 1.0 M KOH solution. The framework showed no obvious degradation over 12 hours of continuous operation at a large current density. Theoretical calculations revealed that the unique structure of the framework facilitated the dissociation of H2O molecules and provided a low-energy coupling pathway for water oxidation, resulting in high performance for overall water splitting.
CHEMISTRY-AN ASIAN JOURNAL
(2023)
Article
Engineering, Mechanical
Liang Wang, Pengpeng Yu, Shiyu Zhang, Zhenhua Zhao, Jiamei Jin
Summary: In this study, an electromechanical step-reduction method for piezoelectric composite beams (VPCBs) is proposed to address the limitation of traditional methods in transferring electrical information and depicting electromechanical coupling behaviors. The effectiveness and applicability of the proposed method are demonstrated through experimental verification and calculation results.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2023)
Article
Materials Science, Multidisciplinary
Lusheng Yuan, Liang Wang, Zhenhua Zhao, Jiamei Jin, Rui Qi
Summary: A novel inertial piezoelectric actuator with double-stator cooperative motion is proposed, designed, fabricated, and tested to achieve high performance and suppress the backward motion. The structure and operation principle of the actuator are explained in detail, and the flexible structure is analyzed through finite element simulation. A dynamic model of the actuator with double-stator working mode is established and simulated, providing guidance for design and optimization. Experimental investigation shows significant improvement in performance compared to previous double-stator inertial piezoelectric actuators, with a maximum speed of 32.84 mm/s, maximum lateral load of 20 N, maximum vertical load of 200 N, minimum backward rate of 0.91%, and minimum resolution of 127.5 nm. The actuator presents a reference for future high-performance piezoelectric actuator design.
JOURNAL OF INTELLIGENT MATERIAL SYSTEMS AND STRUCTURES
(2023)
Article
Multidisciplinary Sciences
Yuqi Zeng, Lei Hao, Yue Chen, Shuyi Liu, Yong Fan, Zhenhua Zhao, Yinzhou Wang, Qi Chen, Yongkun Li
Summary: This study aims to explore and optimize the intervention scheme of intra-arterial hypothermia (IAH) in a middle cerebral artery occlusion and reperfusion (MCAO/R) rat model. The results revealed that the optimal perfusion conditions were 4℃, 2/3 R-ICA (0.50 ml/min) for 20 minutes, and IAH was safe and feasible.
SCIENTIFIC REPORTS
(2023)
Article
Nanoscience & Nanotechnology
Jun-Xi Wu, Wen-Xing Chen, Chun-Ting He, Kai Zheng, Lin-Ling Zhuo, Zhen-Hua Zhao, Jie-Peng Zhang
Summary: In this study, asymmetric structural evolution and a dynamic hydrogen-bonding promotion mechanism of an atomically dispersed electrocatalyst were reported. Nitrogen-doped porous carbons, functionalized by atomically dispersed Co-Ni dual-metal sites with an unprecedented N8V4 structure, were obtained through the pyrolysis of Co/Ni-doped MAF-4/ZIF-8. This electrocatalyst showed remarkable activation behavior due to the in situ oxidation of the carbon substrate to form C-OH groups, which can form reversible hydrogen bonds with the oxygen evolution reaction intermediates, breaking the conventional scaling relationship.
NANO-MICRO LETTERS
(2023)
Article
Green & Sustainable Science & Technology
Guobao Luo, Jian Zhang, Zhenhua Zhao, Mingzhi Sun
Summary: This study investigates the flexural fatigue property of ground tire rubber/silica fume composite modified porous concrete (GTR/SF-PC) under different freeze-thaw cycles. The results show that the flexural fatigue life of GTR/SF-PC decreases about 15% and the fatigue failure rate increases about 50% after 30 freeze-thaw cycles. Thus, considering the freeze-thaw effect is necessary for designing the fatigue equation of porous concrete.
Article
Environmental Sciences
Zhirui Qin, Zhenhua Zhao, Liling Xia, Guangwen Yu, Aihua Miao, Yuhong Liu
Summary: This study investigated the composition, structure, assembly mechanisms, and ecological roles of core microbiota in a typical organic contaminated site. The core microbiota had a lower species diversity but higher relative abundances compared to occasional taxa. It was mainly composed of Proteobacteria, Actinobacteria, Chloroflexi, and Firmicutes. The assembly of core taxa was more influenced by geographical differentiation than environmental filtering, and they played pivotal roles in degrading organic contaminants and maintaining key biogeochemical cycles potentially.
ENVIRONMENTAL RESEARCH
(2023)
Article
Engineering, Mechanical
Lusheng Yuan, Liang Wang, Rui Qi, Zhenhua Zhao, Jiamei Jin, Chunsheng Zhao
Summary: This paper proposes an innovative three-stage flexible lever hollow XY piezoelectric platform powered by piezoelectric stack to enhance space efficiency and reduce the planar dimensions. The paper details the platform's design configuration and operational principles and analyzes and optimizes its static and dynamic characteristics using compliance modeling and finite element methods. Experimental results demonstrate that the platform exhibits excellent performance and can be used for precise motion positioning and inspection of minute electronic components under an optical microscope, enhancing detection and sorting processes in the electronics industry.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2023)
Article
Engineering, Civil
Pu Wang, Zhenhua Zhao, Junqi Ma, Shuguo Wang
Summary: This paper proposes an optimization method for high-speed turnout crossing structures based on the actual elastic deformations of point and splice rails, aiming to address the deficiencies in the existing design method and lack of related research. A refined simulation analysis model is established by fully considering the actual loading characteristics and spatial variable section characteristics of point and splice rails. By obtaining the elastic deformation lines of point and splice rails in the nonworking state, which are consistent with actual situations, system optimization is performed for the connecting parts of the crossing with a movable point in a high-speed turnout. The calculated optimal lengths of the connecting parts are close to the empirical values used in actual manufacturing processes, validating the proposed optimization method. The proposed method effectively improves the coordination between rails and connecting parts in crossing areas, reduces internal stresses in crossing systems, and enhances their assembly performance and service life. The optimization parameters can also provide valuable references for future high-speed turnouts research and improving the designs of existing high-speed turnouts.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART F-JOURNAL OF RAIL AND RAPID TRANSIT
(2023)
