Article
Chemistry, Physical
Dezhi Teng, Jingsi Wang, Chengdi Li, Xiaoxia Sa
Summary: A piston skirt friction and wear apparatus that simulates the contact and relative motion of piston and cylinder liner in a real engine has been developed. This apparatus was used to study the friction and wear behavior of a cast aluminum alloy piston with a graphite coating under different loads. The results showed that the total wear of the piston skirt increased with higher load and the upper part of the skirt surface experienced more severe wear. Three main wear modes, including abrasive, adhesive, and fatigue wear, were identified. The proposed apparatus provides a useful tool to investigate the effects of skirt profile design, coating, and surface texturing on the friction and wear behavior of piston skirts.
Article
Engineering, Mechanical
Congcong Fang, Xianghui Meng, Wei Zhou, Hongchen Huang
Summary: This paper presents an efficient numerical model for investigating the frictional dynamic interactions between the piston skirt-liner system and the pin assembly in piston assembly. The coupling effects between the two friction pairs are explored, and the influences of design parameters on the performance of these friction pairs are further studied. This work provides guidance for the systematic design of piston assembly to enhance the dynamic properties, economic efficiency, and environmental-friendliness of engines.
MECHANISM AND MACHINE THEORY
(2021)
Article
Engineering, Mechanical
Slawomir Kowalski, Boguslaw Cieslikowski, Dalibor Barta, Jan Dizo, Ales Dittrich
Summary: This article presents the causes of wear in piston pin and connecting rod small end due to hinge joint and thermocompression bond respectively. It discusses the changes in geometry and pin-top surface caused by the influence of mating surfaces in different lubrication conditions. The progression of scuffing due to insufficient lubrication or oil film breaking is demonstrated, along with the confirmation of wear through surface roughness measurements. The loss of thermocompression bond surface is noted, caused by the penetration of sintered engine oil with biofuel additive components and spent engine oil improver packages. The progressing wear forms are leading to engine failures.
Article
Engineering, Multidisciplinary
Iresh Bhavi, Vinay V. Kuppast, Devanand D. Chillal
Summary: This study investigated the influence of piston pin-offset on reducing noise and vibration caused by piston slap. Experimental results showed that optimization of piston and cylinder-liner design can minimize stress values and noise intensity.
JOURNAL OF FAILURE ANALYSIS AND PREVENTION
(2021)
Article
Thermodynamics
Yongqiang Wang, Xuan Ma, Tongyang Li, Xiqun Lu, Wanyou Li
Summary: With the development of high-strength marine diesel engines, the importance of piston skirt lubrication has increased. In this study, a dynamical-tribological numerical model is proposed to study the effects of thermal deformation on the secondary motion of the piston, contact force of the piston-skirt corner points, and lubrication characteristics. The results show that the thermal condition reduces the secondary motion and causes earlier reverse rotation of the piston.
INTERNATIONAL JOURNAL OF ENGINE RESEARCH
(2023)
Article
Engineering, Mechanical
Robin Hildyard, Stephen Richard Bewsher, Jack Walker, Jamal Umer, Sina Saremi-Yarahmadi, Manuela Pacella, Mahdi Mohammadpour, Guenter Offner
Summary: The study examines the deposition of three different graphene oxide coatings on the piston skirt of a gasoline engine using an electro-phoretic deposition method, and compares their tribological performance with uncoated steel and graphite-coated aluminum skirts. Results show that an appropriate GO coating can improve frictional power loss while maintaining wear resistance.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART D-JOURNAL OF AUTOMOBILE ENGINEERING
(2021)
Article
Engineering, Mechanical
Bifeng Yin, Xuefeng Wang, Bo Xu, Gongyin Huang, Xin Kuang
Summary: This paper aims to improve the frictional wear resistance properties of piston skirts caused by low viscosity lubricant, by studying the tribological performance of three novel coating materials. Experimental results show that under low viscosity lubricant, the MoS2 coating exhibits the lowest friction coefficient and wear compared to SiO2 and PTFE coatings, indicating excellent stability and adaptability of the MoS2 coating. This research provides valuable insights for the application of wear-resistant materials for heavy-duty diesel engine piston skirts.
INDUSTRIAL LUBRICATION AND TRIBOLOGY
(2021)
Article
Engineering, Mechanical
Junhui Zhang, Fei Lyu, Bing Xu, Weidi Huang, Wei Wu, Zhimin Guo, Haogong Xu, Xiaochen Huang
Summary: The study demonstrates that optimizing the design of a pre-machined surface contour can reduce wear rate during the initial operating stage of the piston/cylinder pair, with the surface modification layer playing a crucial role in this process.
TRIBOLOGY INTERNATIONAL
(2021)
Article
Engineering, Mechanical
Bo Xu, Bifeng Yin, Dashu Gao, Xijun Hua
Summary: Surface treatment technology can form an infiltrated layer on the sample surface, which improves the tribological properties and wear resistance performance of the material.
JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY
(2022)
Article
Engineering, Electrical & Electronic
Wenhan Cao, Zhou Chang, Ao Zhou, Xuqiang Dou, Gui Gao, Jun Gong
Summary: This study establishes a model for the Cap-seal and investigates its performance through numerical and experimental analysis. The results show that parallel offset increases the possibility of seal damage but has no significant effect on leakage. The study provides guidelines for the design and application of oil-free lubrication seals for a Stirling piston rod.
Article
Thermodynamics
Bo Wu, Song Zhang, Weijun Tian, Qian Cong
Summary: This study investigates the effects of applying biomimetic shape to the surface of the piston skirt on lubrication and friction power consumption. Simulation and test results show that the lubrication of the biomimetic groove piston skirt is superior to that of the standard piston, reducing friction and wear while improving wetting.
ADVANCES IN MECHANICAL ENGINEERING
(2023)
Article
Engineering, Mechanical
Shuailun Zhu, Wei Yuan, Jianchen Cong, Qianjian Guo, Baotao Chi, Jie Yu
Summary: This study investigates the causes of localized wear failure on one side of the oil hole in the third crankpin of a straight-six-cylinder internal combustion engine. Through experimental investigations and finite element analysis, the research reveals that the ingress of grinding debris and contaminated particles, migration of carbon elements, and non-uniform stress distribution are the primary drivers of wear in this region.
ENGINEERING FAILURE ANALYSIS
(2023)
Article
Thermodynamics
Aysenur Ates, Behnam Parizad Benam, Vedat Yagci, Muhammed Caglar Malyemez, Murat Parlak, Abdolali K. Sadaghiani, Ali Kosar
Summary: This study investigates the effects of pin fins and tip clearance on flow boiling in heat sinks, showing that distribution pin fins and streamlined pin fin configurations can enhance the heat transfer performance.
APPLIED THERMAL ENGINEERING
(2022)
Article
Materials Science, Coatings & Films
Khaled Chemaa, Salim Hassani, Mohammed Gaceb, Noureddine Madaoui, Abdelhamide Guebli
Summary: Depositing a W-Ti-N thin film on Al-Si and stainless steel substrates using PVD sputtering system is a promising way to enhance the tribological properties of engine piston skirts, leading to significantly lower friction coefficient and wear rates compared to uncoated samples, as well as showing interesting corrosion behavior.
SURFACE ENGINEERING
(2021)
Article
Engineering, Mechanical
Baofeng Zhang, Xuan Ma, Lining Liu, Hanzhengnan Yu, Ardian Morina, Xiqun Lu
Summary: In this study, operating parameters were obtained through an engine bench test and thousands of hours of reciprocating lubrication wear tests were conducted on a multifunction wear tester. The wear state of the cylinder liner was divided into mild, medium, and severe wear based on the analysis of wear rate variation under different test parameters. The wear mechanisms of spalling, delamination, and massive spalling were identified for different wear states.
TRIBOLOGY INTERNATIONAL
(2023)
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)