Article
Engineering, Mechanical
Davoud Shahgholian-Ghahfarokhi, Gholamhossein Rahimi
Summary: This paper presents a new analytical approach for the buckling of composite sandwich pipes under uniform external lateral pressure. The stiffness contributions of iso-grid cores are evaluated, and the Rayleigh-Ritz energy method is used to calculate the critical buckling pressure. Parametric study reveals the impact of various factors on the buckling of sandwich pipes.
JOURNAL OF SANDWICH STRUCTURES & MATERIALS
(2021)
Article
Engineering, Marine
Xu Zhang, Jianliang Sun, Runze Wu, Yan Peng
Summary: This paper proposes a pressure shell with an inter corrugated structure for improving the compression performance of submarines and deep-sea space stations. Experimental and numerical results show that the corrugated structure can significantly increase the critical buckling load of the pressure shell, providing guidance for the design of pressure structures for large deep-sea equipment.
Article
Mechanics
Felipe Piana Vendramell Ferreira, Konstantinos Daniel Tsavdaridis, Carlos Humberto Martins, Silvana De Nardin
Summary: This paper investigates the buckling and post-buckling analyses of composite cellular beams through experimental tests to calibrate the numerical model. For symmetrical sections, the end post is a key parameter, with smaller opening diameter resulting in greater global shear; height variation has minimal impact on larger diameters and widths. In asymmetric sections, web post buckling does not occur in the first buckling mode, with an increase in global shear observed with height variation.
COMPOSITE STRUCTURES
(2021)
Article
Mechanics
Junpeng Liu, Bo Yu, Yang Zhou, Yi Zhang, Menglan Duan
Summary: A new approximate analytical model is proposed for the buckling analysis of spherical-cylindrical honeycomb sandwich shells under uniform external pressure. Analytical solutions for critical buckling pressure are obtained using the generalized Galerkin method and verified through comparison with finite element modeling, showing good agreement. The formulas not only provide an efficient tool for calculating critical buckling pressure, but also have applications in other spherical-cylindrical composite sandwich shells.
COMPOSITE STRUCTURES
(2021)
Article
Mechanics
Nicolas Jacquet, Nicolas Tardif, Thomas Elguedj, Christophe Garnier
Summary: The buckling of thick elasto-visco-plastic hemi-egg shells is studied in this work using a modelling/experimental approach. It is found that the buckling behavior is influenced by the rate dependence of the material under non-proportional load paths. A buckling prediction model is used to accurately predict the buckling of the hemi-egg shells, and good agreement is observed between numerical results and experiments.
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2022)
Article
Engineering, Marine
Yanfei Chen, Shaohua Dong, Zhipeng Zang, Chuan Ao, Hao Liu, Modi Gao, Shang Ma, Enyong Zhang, Jing Cao
Summary: This paper introduces the homotopy analysis method (HAM) to investigate the buckling failure of subsea pipelines with corrosion defects, and the proposed solutions show accurate and efficient predictions. Numerical examples demonstrate that corrosion shapes have a pronounced effect on the buckling pressure and buckling mode of pipelines with severe corrosion defects, highlighting the importance of considering these factors in the structural integrity assessment of subsea pipelines.
Article
Materials Science, Composites
Eduardo Gerhardt, Rogerio J. Marczak, Sandro C. Amico
Summary: A numerical-experimental approach was developed to predict structural instability in thin composite tubes, considering the divergence in mechanical properties characterized through standardized procedures and those of the manufactured component. Material properties calibration was done using a ring compression test and an inverse finite element analysis routine based on Tsai's master-ply concept, delivering feasible constitutive properties values. The implemented approach was considered effective and with good repeatability based on the numerical and experimental correlation.
POLYMER COMPOSITES
(2021)
Article
Engineering, Civil
Xinlong Zuo, Jian Zhang, Wenxian Tang, Yongsheng Li, Hongyun Li
Summary: This study investigated the buckling behavior of steel and steel-composite cylinders under external pressure. The findings indicate that the steel cylinders can be considerably strengthened by wrapping composite materials, and the steel-composite cylinders are slightly less sensitive to large imperfections compared with steel cylinders.
THIN-WALLED STRUCTURES
(2022)
Article
Construction & Building Technology
Jun Shi, Lanhui Guo, Shan Gao, Zhiguo Li
Summary: This paper investigates the steel faceplate buckling of double skin composite walls stiffened with studs or steel-bar trusses through axial compressive tests and finite element simulation. The study examines the influence of geometric parameters, such as welding spot spacing-to-thickness ratio and spacing aspect ratio, on the buckling stress of the faceplate.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Chemistry, Physical
Dorota Pawlus
Summary: This paper evaluates the static stability of complex, composite annular plates with auxetic properties, developing a plate model based on orthogonalization and finite difference methods. The study shows an increase in critical static loads with increasing absolute value of Poisson's ratio of auxetic facings.
Article
Materials Science, Composites
Jiale Wu, Xupeng Song, Yangzhi Gong, Wei Yang, Lin Chen, Shaojian He, Jun Lin, Xingming Bian
Summary: The thermal conductivity of Al2O3/SIR composites was studied with the changes in volume fraction, particle size, and binary filling schemes, proposing the particle contact probability to quantitatively characterize the formation probability of heat conduction path. Increasing the volume fraction of fillers leads to higher contact probability of filler particles, thus enhancing the thermal conductivity of the composites.
COMPOSITES SCIENCE AND TECHNOLOGY
(2021)
Article
Materials Science, Multidisciplinary
Jiaqi Chen, Hao Wang, Milad Salemi, Perumalsamy N. Balaguru
Summary: This paper evaluates the mechanical behavior of damaged steel pipelines with CFRP repair using FE analysis. The study shows that increasing CFRP thickness can reduce stress, and the reinforcement of the CFRP can be enhanced by using infill material with a higher elastic modulus.
Article
Mechanics
Alessandro Vescovini, Carina Xiaochen Li, Javier Paz Mendez, Bo Cheng Jin, Andrea Manes, Chiara Bisagni
Summary: This paper presents a study on six single-stringer specimens manufactured using the card-sliding technique with non-crimp fabrics and adopting a Double-Double (DD) stacking sequence. The specimens were tested under compression loading conditions to investigate post-buckling and failure in aerospace structures. Experimental results and numerical simulations were compared to analyze the behavior and failure modes of the specimens. The study found promising evidence of a viable solution to optimize aeronautical structures and enhance resistance to skin-stringer separation, particularly with the use of tapered flanges.
COMPOSITE STRUCTURES
(2024)
Article
Engineering, Civil
Ruihai Xin, Vinh Tung Le, Nam Seo Goo
Summary: In this study, the global-local buckling phenomenon in shell structures was investigated using a multi-Digital Image Correlation (DIC) technique. Experimental and numerical analysis were conducted to confirm the findings.
THIN-WALLED STRUCTURES
(2022)
Article
Mechanics
Nguyen Van Thinh, Hoang Van Tung
Summary: This paper investigates the nonlinear free vibration of CNT-reinforced composite cylindrical panels exposed to thermal environments. The influences of various parameters, such as CNT distribution, imperfection size, edge constraint, foundation stiffness, and temperature, on the natural frequencies and nonlinear-to-linear frequency ratio are analyzed.
Article
Engineering, Environmental
Zengkai Liu, Qiang Ma, Baoping Cai, Yonghong Liu, Chao Zheng
Summary: This paper introduces a dynamic risk assessment model for evaluating the safety of deepwater drilling operations, which can comprehensively analyze the risk factors and clarify the impact of blowouts. By analyzing risk factors, developing dynamic Bayesian network model, and conducting risk analysis, the model provides insights into the risks associated with blowouts.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2021)
Article
Metallurgy & Metallurgical Engineering
Bao-ping Cai, Chao Yang, Yong-hong Liu, Xiang-di Kong, Chun-tan Gao, An-bang Tang, Zeng-kai Liu, Ren-jie Ji
Summary: This study proposes a data-driven early leakage localization approach based on Bayesian networks, using wavelet transform for signal noise reduction to improve accuracy. An example with a hydraulic system with eight valves demonstrates the application of this method.
JOURNAL OF CENTRAL SOUTH UNIVERSITY
(2021)
Article
Computer Science, Artificial Intelligence
Baoping Cai, Keke Hao, Zhengda Wang, Chao Yang, Xiangdi Kong, Zengkai Liu, Renjie Ji, Yonghong Liu
Summary: PMSM is a common core power component in modern industrial systems, but early fault diagnosis is difficult with low accuracy. A Bayesian-network-based method is proposed and validated. When using acoustic emission signal, the accuracy can exceed 90%.
EXPERT SYSTEMS WITH APPLICATIONS
(2021)
Article
Engineering, Industrial
Baoping Cai, Wenchao Li, Yiliu Liu, Xiaoyan Shao, Yanping Zhang, Yi Zhao, Zengkai Liu, Renjie Ji, Yonghong Liu
Summary: A novel methodology based on multi-stage dynamic Bayesian networks is proposed for evaluating safety instrumented systems with heterogeneous components, constructing a unified evaluation model and an automatic modeling method for conditional probability tables. The approach can calculate the average probability of failure on demand, probability of failing safety, and life-cycle cost of SISs, helping designers determine the configuration of heterogeneous redundant structures.
RELIABILITY ENGINEERING & SYSTEM SAFETY
(2021)
Article
Electrochemistry
Shokoufeh Rastgar, Sebastian Pleis, Yanzhen Zhang, Gunther Wittstock
Summary: A strategy is proposed to generate single microdrops with femtoliter to microliter volumes as a liquid reactor and to guide them towards a reactive surface within a viscous carrier liquid. Reactions of the drop content with the surface are exemplified by exhaustive electrolysis of the reactor content, making use of an ion-conducting pathway through the carrier liquid. The mechanisms by which the redox-active species from the aqueous drop reach the electrode surface were established by a combination of time-lapse microscopy of the drop shape, chronoamperometric recording of the single drop electrolysis, and modelling of the reaction-transport problem, showing that partitioning over the liquid-liquid interface must be a key step in this mechanism. The possibilities of reagent delivery and external triggering of a reaction are expanded by the possibility for controlled addition of further dissolved reactants to the liquid microreactor.
Article
Engineering, Manufacturing
Chi Ma, Changlong Li, Yuhao Yan, Yonghong Liu, Xinlei Wu, Dege Li, Hui Jin, Fan Zhang
Summary: This study proposed a novel in situ vibration method to suppress the challenges of coarse grains in wire and arc additive manufacturing (WAAM). By applying vibration during the manufacturing process, the grain size in both fine grain zone and coarse grain zone was reduced. The mechanical strength and hardness of the parts were improved after the vibration treatment.
3D PRINTING AND ADDITIVE MANUFACTURING
(2023)
Article
Mechanics
Dege Li, Haoren Li, Guodong Yang, Jide Wang, Bingfang Huang, Xinlei Wu, Qiang Sun, Chi Ma, Yonghong Liu, Yanzhen Zhang
Summary: This study investigates the characteristics and mechanisms of confined interface vibration inkjet printing (CIVIJP) at high frequencies, and proposes a new method for adjusting the droplet size, which is of great significance for improving inkjet printing efficiency.
Editorial Material
Electrochemistry
Shokoufeh Rastgar, Sebastian Pleis, Yanzhen Zhang, Gunther Wittstock
Article
Mechanics
Dege Li, Yi Cao, Bingfang Huang, Xinlei Wu, Guofang Hu, Xiaolong Wang, Yonghong Liu, Yanzhen Zhang
Summary: The breakup process of an inviscid liquid bridge sandwiched between two coaxial rods is investigated, with a focus on its profile close to rupture and its influence on subsequent breakup behaviors. The profile of the liquid bridge undergoes a transition from symmetry to asymmetry as the distance between the rods increases. A critical slenderness is found above which the liquid bridge becomes asymmetric and exhibits a well-fitted profile of a sine wave cycle. Experimental and theoretical results show that the ratio of bridge length to equivalent radius is always 2 pi for the asymmetric bridge close to rupture. The influence of slenderness on the time interval between asymmetric pinch-off events, velocity, destination, and size of the satellite droplet is explored.
Article
Mechanics
Dege Li, Haoren Li, Guodong Yang, Yi Cao, Bingfang Huang, Xinlei Wu, Qiang Sun, Chi Ma, Yu Zhou, Yonghong Liu, Yanzhen Zhang
Summary: This study proposes a confined interface vibration inkjet printing technique that allows for printing patterns in a liquid environment with smaller droplet sizes. By adjusting the intensity of the pulse stimulation, the size and quantity of the dispensed droplets can be controlled, enriching the fundamental theory of inkjet printing in liquid phase.
JOURNAL OF FLUID MECHANICS
(2022)
Article
Nanoscience & Nanotechnology
Dege Li, Jide Wang, Guodong Yang, Xinlei Wu, Zihao Li, Guofang Hu, Xiaolong Wang, Yonghong Liu, Yanzhen Zhang
Summary: In this study, a high-throughput piezoelectric droplet dispensing technique based on the resonance of the liquid column within the glass capillary was proposed. Experimental and theoretical studies showed that the resonance frequencies of different orders of the liquid column perfectly matched the theoretical value. It was further demonstrated that droplets could be ejected by a driving voltage as low as 1 V when the working frequency was close to the resonant frequency of the piezoelectric ceramic. This ultra-low driving voltage and power consumption make this dispenser compatible with various digital transistor-transistor logic or complementary metal-oxide-semiconductor drive circuits without any power amplifier.
Article
Engineering, Electrical & Electronic
Yanzhen Zhang, Mingyu Yan, Jianhao Zhu, Haifeng Zang
Summary: This paper presents a straightforward and efficient method for liquid metal patterning using nanosecond laser irradiation. It investigates the influence of laser parameters and orifice geometries on the characteristics of liquid metal ejection, providing a theoretical and technical foundation for achieving precise and efficient patterning of liquid metals.
ACS APPLIED ELECTRONIC MATERIALS
(2023)
Article
Computer Science, Interdisciplinary Applications
Baoping Cai, Hongyan Fan, Xiaoyan Shao, Yonghong Liu, Guijie Liu, Zengkai Liu, Renjie Ji
Summary: This study proposed a RUL re-prediction method based on the Wiener process, which combines the current monitoring status and historical degradation data of the system. The dynamic Bayesian networks model is used to address the uncertainty caused by missing data.
COMPUTERS & INDUSTRIAL ENGINEERING
(2021)
Article
Engineering, Mechanical
Willy Ank de Morais, Railson Bolsoni Falcao, Mario Boccalini Jr, Fernando Jose Gomes Landgraf
Summary: This study compares the fatigue behavior of bcc Nb-48 wt%Ti (Ti-36at%Nb) alloy parts processed by Laser Powder Bed Fusion (L-PBF) using two different types of powders (spherical powder produced by Plasma Atomization and irregularly shaped powder produced by Hydride-Dehydride). The results show that the fatigue behavior is similar for both powders, but the specimens produced from the Hydride-Dehydride powder have higher dispersed results. Fracture primarily occurs in the porosities near the machined sample surface, and the fatigue cracks propagate in a zigzag mode parallel to the L-PBF building direction.
ENGINEERING FAILURE ANALYSIS
(2024)
Article
Engineering, Mechanical
Guoxi Jing, Shuai Sun, Teng Ma, Shubo Li, Tian Ma, Junchao Wei, Jianchao Pang
Summary: This study proposes a parameter identification method for predicting the TMF life of CGI materials used in cylinder heads. The study evaluates the TMF behavior of RuT450 material and successfully predicts its TMF life using multi-objective optimization. The results highlight the influence of plastic strain amplitude, temperature, and strain rate on the damage mechanism and life prediction.
ENGINEERING FAILURE ANALYSIS
(2024)
Article
Engineering, Mechanical
Xin Zhang, Xu Li, Weipeng Xu, Kuidong Gao, Kao Jiang, Xinyu Wang, Hongxin Wei
Summary: Conical picks are commonly used in tunnel excavation and often experience high temperatures during the cutting process. This study investigated the influence of temperature on the wear of conical picks and proposed a method for measuring rock abrasiveness that takes into account the thermal effect. The experimental results showed that cooling liquid reduced the maximum temperature and the mean mass loss of the conical pick. Additionally, the study examined the characteristics of oxygen and found evidence of peeling, cracking, and oxidation on the grinding rod used for rock abrasiveness measurement.
ENGINEERING FAILURE ANALYSIS
(2024)
Article
Engineering, Mechanical
Vivek Srivastava, Deependra Singh, A. G. Rao, V. P. Deshmukh
Summary: Engine gear failures are a significant concern in various industries. Investigating each gear failure and determining the root cause is important for preventing future failures. This study used experimental and numerical analysis techniques to investigate the premature failure of a flywheel gear in a marine diesel engine. The findings revealed that the gear failed due to overload stresses caused by overload torque generated from sudden inertial thrust in the internal combustionengine.
ENGINEERING FAILURE ANALYSIS
(2024)
Article
Engineering, Mechanical
Jun Zhang, Weidong Liu, Feilong Liu, Zhiqiang Yang, Jinfang Peng, Minhao Zhu
Summary: During a major overhaul of an aeroengine, a cracked stator vane of the low-pressure compressor was discovered, with the crack originating from a corrosion pit located on the arc transition between the leading edge and the upper edge plate. The fracture surface exhibited signs of fatigue cracks, indicating a pit-related fatigue crack. Metallographic examination revealed that most corrosion pits were distributed beneath the bulging or peeling paint layer on the leading edge and the concave side. Identification of the corrosion products showed the presence of sulfate and alumina, suggesting atmospheric corrosion as a likely cause for the cracked stator vane.
ENGINEERING FAILURE ANALYSIS
(2024)
Article
Engineering, Mechanical
Juan Jose Jimenez de Cisneros Fonfria, Ester Olmeda, Susana Sanz, Maria Garrosa, Vicente Diaz
Summary: Energy absorbing devices in vehicles can partially transform impact energy and protect passengers. In this paper, the failure analysis of the underframe crumple zone in a train car was conducted through finite element simulations, showing that the component acted properly after the impact.
ENGINEERING FAILURE ANALYSIS
(2024)
Article
Engineering, Mechanical
Fengqi Zhang, Gang Luo, Haiyang Zhang, Peihong Cong, Lulu Liu, Wei Chen
Summary: In this study, a predictive model for bird strike trajectory was developed based on the quasi-linear viscoelastic model. By combining simulation analysis under multiple conditions, the model reproduced the trajectory change law in low and medium speed bird impact experiments.
ENGINEERING FAILURE ANALYSIS
(2024)
Article
Engineering, Mechanical
S. M. de Gouveia, L. de Abreu Correa, D. B. Teles, M. Oliveira, T. G. R. Clarke
Summary: Emergency Shutdown Valves (EDSVs) are used in industrial applications to interrupt fluid flow during hazardous events. The damage to the valve seats can be detected by analyzing the pressure and torque data. This study compared three processing options and found that evaluating the complete signature with a Gradient Boosting Classifier algorithm is the most effective strategy.
ENGINEERING FAILURE ANALYSIS
(2024)
Article
Engineering, Mechanical
Xinyan Jin, Kai Wang, Hongwei Qian
Summary: This study investigated the root cause of an abnormal premature groove-clogging failure on a sink roll in a hot-dip galvanizing line. It was found that the failure was caused by the buildup of a large amount of Fe2Al5Znx dross in the grooves, and the key factor was the control of Tstrip.
ENGINEERING FAILURE ANALYSIS
(2024)
Article
Engineering, Mechanical
Zhiqiang Li, Jie Li, Cen Li, Xiaodong Xie, Zhiyong Yang
Summary: In this study, the microstructure evolution of the material in the hot spot area of the high-speed train brake disc was observed and the mechanism of mechanical property degradation was obtained through tensile tests. The research results provide guidance for crack damage identification of the brake disc and condition-based maintenance.
ENGINEERING FAILURE ANALYSIS
(2024)
Article
Engineering, Mechanical
Lijia Luo, Yincheng Wang, Wei Chen, Zuming Zhao, Wenfei Chen, Shiyi Bao
Summary: Tube-to-tube impact wear is a significant factor in the failure of alloy 690 tubes in nuclear steam generators. This paper investigates the wear damage mechanism and detection method of alloy 690 tubes under tube-to-tube impact loads. The results reveal the wear damage mechanism through analysis of macro and micro morphologies as well as metallographic structures. A nonlinear ultrasonic wave mixing method is proposed for damage detection and a detection device is developed to implement this method. Experimental results indicate that the damage mode of tube-to-tube impact wear varies with impact load and cycle number, and the nonlinear modulation index is effective in assessing the damage degree of alloy 690 tubes.
ENGINEERING FAILURE ANALYSIS
(2024)
Article
Engineering, Mechanical
Xing-Ju Yang, Feng Lin, Xu Du, Lu Qiu
Summary: This paper proposes a novel method of improving the progressive collapse resistance of RC frame structures by adding locally debonded kinked steel plates (KPs). Experimental tests and finite element analysis reveal that the addition of KPs significantly enhances the ultimate resistance and deformability of the beam-slab substructures. The mechanism of resistance improvement is explained, and an analytical model is developed for predicting the ultimate resistance of the structures.
ENGINEERING FAILURE ANALYSIS
(2024)
Article
Engineering, Mechanical
Xiaohe Wang, Zengqiang Cao
Summary: This paper presents a dynamic installation (DI) method based on electromagnetic force to reduce damage to composite laminates and improve joint performance. The study shows that DI can effectively decrease installation resistance, reduce severe damage to laminates, and improve stress distribution in the joint.
ENGINEERING FAILURE ANALYSIS
(2024)
Article
Engineering, Mechanical
Jitong Cui, Yingying Kong, Cuiwei Liu, Baoping Cai, Faisal Khan, Yuxing Li
Summary: This paper presents a method for quantifying the failure probability of hydrogen doped pipelines and utilizes Bayesian network for quantitative calculation. The results show that this method can more accurately assess the failure probability of hydrogen doped pipelines and provide a decision basis for preventing failure accidents.
ENGINEERING FAILURE ANALYSIS
(2024)
Article
Engineering, Mechanical
Yiping Jiang, Maoru Chi, Jungang Yang, Liangcheng Dai, Yuchen Xie, Zhaotuan Guo
Summary: This article investigates and simulates the derailment of empty freight trains at the switch section of a turnout in the diverging route, and proposes preventive measures. The results show that the derailment is caused by the combined effect of various factors, and reducing the longitudinal coupler force and the wheel rail friction coefficient can decrease the possibility of derailment. Additionally, installing a guard rail in front of the turnout can effectively prevent derailment.
ENGINEERING FAILURE ANALYSIS
(2024)
