Pub Date : 2024-05-09DOI: 10.1177/13506501241253879
Duc H Nguyen, Nicolas Herzig, Romeo Glovnea
This paper presents an experimental investigation into lift generation during the tangential motion of an inclined surface over a compressible porous layer, focusing on an exceptionally slow sliding speed, a condition that has not been considered in previous studies. Specifically, we validated Pascovici's one-dimensional lubrication model for an inclined slider under the above condition. Additionally, we explore the use of woven fibrous material for soft porous lubrication, broadening the range of media for future studies.
{"title":"Pressure evaluation in highly porous medium hydrodynamic bearings","authors":"Duc H Nguyen, Nicolas Herzig, Romeo Glovnea","doi":"10.1177/13506501241253879","DOIUrl":"https://doi.org/10.1177/13506501241253879","url":null,"abstract":"This paper presents an experimental investigation into lift generation during the tangential motion of an inclined surface over a compressible porous layer, focusing on an exceptionally slow sliding speed, a condition that has not been considered in previous studies. Specifically, we validated Pascovici's one-dimensional lubrication model for an inclined slider under the above condition. Additionally, we explore the use of woven fibrous material for soft porous lubrication, broadening the range of media for future studies.","PeriodicalId":509096,"journal":{"name":"Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology","volume":" 11","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140997145","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-05-07DOI: 10.1177/13506501241249839
Srusti Priyadarshini, Suraj K Behera
Gas foil journal bearings (GFJBs) are widely considered technically advanced bearings and a viable alternative to conventional rolling element and oil-lubricated bearings in high-speed rotating machinery. GFJBs offer advantages such as reduced maintenance, improved efficiency, and the ability to operate in challenging environments. A traditional GFJB consists of (i) a smooth top foil for the generation of hydrodynamic pressure, (ii) a compliant corrugated foil beneath the top foil for tailoring stiffness, and (iii) a bearing base to hold the foils together. The shape and geometry of corrugated thin foil are primarily designed for the essential stiffness and load-carrying capacity of the bearings. The thickness of thin foils is in the range of 100–150 μm. The fabrication of complaint thin foils to their desired shapes and sizes is quite challenging. Engineers and researchers around the world have designed and published various advanced design structures of GFJBs to improve their static and dynamic characteristics. The corrugated or compliant structure is the most significant component of GFJBs from design and fabrication point of view. Therefore, a modest attempt is made by the authors to review and report systematically on various foil journal bearings reported in open literature. The study covers four primary categories, which are centered around the design of compliant structures, materials, manufacturing processes, and coatings over the years. By analyzing the state-of-the-art advancements, this review aims to identify key areas for further research, explain technological trends, and underline the pivotal role of GFJBs in various high-speed applications across industries.
{"title":"A comprehensive review on advancements in compliant structures of gas foil journal bearings","authors":"Srusti Priyadarshini, Suraj K Behera","doi":"10.1177/13506501241249839","DOIUrl":"https://doi.org/10.1177/13506501241249839","url":null,"abstract":"Gas foil journal bearings (GFJBs) are widely considered technically advanced bearings and a viable alternative to conventional rolling element and oil-lubricated bearings in high-speed rotating machinery. GFJBs offer advantages such as reduced maintenance, improved efficiency, and the ability to operate in challenging environments. A traditional GFJB consists of (i) a smooth top foil for the generation of hydrodynamic pressure, (ii) a compliant corrugated foil beneath the top foil for tailoring stiffness, and (iii) a bearing base to hold the foils together. The shape and geometry of corrugated thin foil are primarily designed for the essential stiffness and load-carrying capacity of the bearings. The thickness of thin foils is in the range of 100–150 μm. The fabrication of complaint thin foils to their desired shapes and sizes is quite challenging. Engineers and researchers around the world have designed and published various advanced design structures of GFJBs to improve their static and dynamic characteristics. The corrugated or compliant structure is the most significant component of GFJBs from design and fabrication point of view. Therefore, a modest attempt is made by the authors to review and report systematically on various foil journal bearings reported in open literature. The study covers four primary categories, which are centered around the design of compliant structures, materials, manufacturing processes, and coatings over the years. By analyzing the state-of-the-art advancements, this review aims to identify key areas for further research, explain technological trends, and underline the pivotal role of GFJBs in various high-speed applications across industries.","PeriodicalId":509096,"journal":{"name":"Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology","volume":"38 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141002225","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-05-06DOI: 10.1177/13506501241251524
Ju Shu, Cayetano Espejo, M. Kalin, A. Morina
Bio-based materials have attracted great attention from industry and academia in tribology because they are renewable, bio-degradable and easily accessible. This study aims to evaluate the efficiency of bio-based materials used both as neat lubricants and additives on friction and wear performance. The evaluated lubricants include oleic acid, a mixture containing oleic acid and dodecyl amine in hexadecane and a neat ionic liquid composed of oleic acid and dodecyl amine. The influence of the additive concentration, ratio between acid and amine, and oscillation frequency under reciprocating contacts has been investigated. Surface analysis was conducted by optical microscope, scanning electron microscopy and energy-dispersive X-ray spectroscopy, and time-of-flight secondary ion mass spectrometry. The results confirm that a small amount of oleic acid as an additive can provide limited friction reduction. Bio-based ionic liquid shows the lowest friction and wear coefficient in all testing conditions. A synergistic effect between oleic acid and dodecyl amine as an additive mixture has been observed when the two components are equimolar and the oscillating frequency is high. Time-of-flight secondary ion mass spectrometry analysis of the wear track indicates that the tribological process enhances the ionic character of the additive mixture, improving the lubrication performance.
生物基材料具有可再生、可生物降解和易于获取的特点，因此在摩擦学领域引起了工业界和学术界的极大关注。本研究旨在评估生物基材料作为纯润滑剂和添加剂对摩擦和磨损性能的影响。被评估的润滑剂包括油酸、油酸和十二烷基胺在十六烷中的混合物以及由油酸和十二烷基胺组成的纯离子液体。研究了添加剂浓度、酸和胺的比例以及往复接触下振荡频率的影响。采用光学显微镜、扫描电子显微镜和能量色散 X 射线光谱法以及飞行时间二次离子质谱法进行了表面分析。结果证实，作为添加剂的少量油酸可以有限地减少摩擦。在所有测试条件下，生物基离子液体的摩擦系数和磨损系数都最低。油酸和十二烷基胺作为混合添加剂，在两种成分等摩尔且振荡频率较高时可产生协同效应。对磨损轨迹的飞行时间二次离子质谱分析表明，摩擦过程增强了添加剂混合物的离子特性，从而改善了润滑性能。
{"title":"Tribological performance of fatty acid, acid/amine additive mixture and ionic liquid","authors":"Ju Shu, Cayetano Espejo, M. Kalin, A. Morina","doi":"10.1177/13506501241251524","DOIUrl":"https://doi.org/10.1177/13506501241251524","url":null,"abstract":"Bio-based materials have attracted great attention from industry and academia in tribology because they are renewable, bio-degradable and easily accessible. This study aims to evaluate the efficiency of bio-based materials used both as neat lubricants and additives on friction and wear performance. The evaluated lubricants include oleic acid, a mixture containing oleic acid and dodecyl amine in hexadecane and a neat ionic liquid composed of oleic acid and dodecyl amine. The influence of the additive concentration, ratio between acid and amine, and oscillation frequency under reciprocating contacts has been investigated. Surface analysis was conducted by optical microscope, scanning electron microscopy and energy-dispersive X-ray spectroscopy, and time-of-flight secondary ion mass spectrometry. The results confirm that a small amount of oleic acid as an additive can provide limited friction reduction. Bio-based ionic liquid shows the lowest friction and wear coefficient in all testing conditions. A synergistic effect between oleic acid and dodecyl amine as an additive mixture has been observed when the two components are equimolar and the oscillating frequency is high. Time-of-flight secondary ion mass spectrometry analysis of the wear track indicates that the tribological process enhances the ionic character of the additive mixture, improving the lubrication performance.","PeriodicalId":509096,"journal":{"name":"Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology","volume":"62 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141011720","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-05-06DOI: 10.1177/13506501241246028
Lichuan Deng, B. Luo, Kaifu Zhang, Hui Cheng, Langkun Lin, B. Liang
The interfacial contact status of a joint determines the sealing performance of an aircraft hydraulic system, which is influenced by inevitable multiscale assembly errors and joint manufacturing deviations. To address these challenges, a novel geometric analysis model was heuristically created that incorporates assembly and manufacturing-related topographies to accurately estimate the initial relative assembly position of joint surfaces. A microscopic contact model was constructed using the reverse reconstruction approach based on measured surface characteristics. Combining the relative position, a multiscale finite element contact model was generated to investigate the impact of each scale topography on the contact state of the seal ring. The experimental data verified the simulated indentation findings, confirming the model's efficacy in estimating contact status and seal performance characteristics. It is found that the flare angle has a more obvious effect on the contact state of the sealing interface, and a 2° difference in angle under the same load can cause a 28.19% difference in contact area, which greatly affects the sealing performance.
{"title":"A novel FE model for the sealing performance of aviation flare joints with multiscale factors of manufacturing and assembly","authors":"Lichuan Deng, B. Luo, Kaifu Zhang, Hui Cheng, Langkun Lin, B. Liang","doi":"10.1177/13506501241246028","DOIUrl":"https://doi.org/10.1177/13506501241246028","url":null,"abstract":"The interfacial contact status of a joint determines the sealing performance of an aircraft hydraulic system, which is influenced by inevitable multiscale assembly errors and joint manufacturing deviations. To address these challenges, a novel geometric analysis model was heuristically created that incorporates assembly and manufacturing-related topographies to accurately estimate the initial relative assembly position of joint surfaces. A microscopic contact model was constructed using the reverse reconstruction approach based on measured surface characteristics. Combining the relative position, a multiscale finite element contact model was generated to investigate the impact of each scale topography on the contact state of the seal ring. The experimental data verified the simulated indentation findings, confirming the model's efficacy in estimating contact status and seal performance characteristics. It is found that the flare angle has a more obvious effect on the contact state of the sealing interface, and a 2° difference in angle under the same load can cause a 28.19% difference in contact area, which greatly affects the sealing performance.","PeriodicalId":509096,"journal":{"name":"Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology","volume":"19 5","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141009046","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-05-06DOI: 10.1177/13506501241250369
Marah A. Elsiedy, Abdelhameed A. A. Zayed, Hesham A. Hegazi, A. El-Kassas
Design-optimization of power transmitted elements such as gears is a complicated process to accomplish as the mathematical model acquires to be in compliance with the optimization algorithm used. Utilization of technical standards and handbooks assisted engineers and designers with designing the gears, however the results were inefficient, thus meta-heuristic algorithms were approved for optimization, for example, genetic algorithm. In this paper, optimization of single stage spur gear pair made of polyoxymethylene material was carried out using genetic algorithm (GA), artificial bee colony (ABC), JAYA, grey wolf optimizer (GWO), and whale optimization algorithm (WOA) in MATLAB. Three single functions were used as objectives, those are, weight, power loss, and center distance. Module ( m), face width ( b), number of pinion teeth ( z1), and finally profile shifts ( x1, x2) served as design variables. Unlike steel gears which were constrained by handling root bending stress and flank pressure, more constraints were added to the problem with the increase of complexity such as root and flank temperature, tooth deformation, and wear abrasion. The results showed a significant decrease in all three objectives when optimizing each objective solely with variation of the variables. It is also observed that JAYA has the superiority in decreasing the three objectives in comparison to GA and ABC nevertheless, in agreement with GWO, and WOA.
{"title":"Optimization of polyoxymethylene spur gear pair using meta-heuristic algorithms: A comparative study","authors":"Marah A. Elsiedy, Abdelhameed A. A. Zayed, Hesham A. Hegazi, A. El-Kassas","doi":"10.1177/13506501241250369","DOIUrl":"https://doi.org/10.1177/13506501241250369","url":null,"abstract":"Design-optimization of power transmitted elements such as gears is a complicated process to accomplish as the mathematical model acquires to be in compliance with the optimization algorithm used. Utilization of technical standards and handbooks assisted engineers and designers with designing the gears, however the results were inefficient, thus meta-heuristic algorithms were approved for optimization, for example, genetic algorithm. In this paper, optimization of single stage spur gear pair made of polyoxymethylene material was carried out using genetic algorithm (GA), artificial bee colony (ABC), JAYA, grey wolf optimizer (GWO), and whale optimization algorithm (WOA) in MATLAB. Three single functions were used as objectives, those are, weight, power loss, and center distance. Module ( m), face width ( b), number of pinion teeth ( z1), and finally profile shifts ( x1, x2) served as design variables. Unlike steel gears which were constrained by handling root bending stress and flank pressure, more constraints were added to the problem with the increase of complexity such as root and flank temperature, tooth deformation, and wear abrasion. The results showed a significant decrease in all three objectives when optimizing each objective solely with variation of the variables. It is also observed that JAYA has the superiority in decreasing the three objectives in comparison to GA and ABC nevertheless, in agreement with GWO, and WOA.","PeriodicalId":509096,"journal":{"name":"Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology","volume":"154 3‐5","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141007349","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-05-02DOI: 10.1177/13506501241250368
G. Kumar, H. Garg
Recently, environmentally acceptable lubricants (EALs) developed from vegetable oils are more widely used in the field of lubrication technology as an alternative to mineral and synthetic oils. The homogeneous and long-term stability of additives in base lubricants is a crucial requirement for potential applications of vegetable oil-based ionanolubricants (INLs). In this study, the INLs have been formulated with two vegetable oils, rice bran oil and sesame oil containing TiO2 nanoparticles (NPs) and two ionic liquids IL1, 1-ethyl 3-methylimidazolium dicyanamide [EMIM][DCN] and IL2, trihexyltetradecylphosphonium bis(24,4-trimethylpentyl) phosphinate ([P66614][BTMPP]) with surfactants. The main objective is to find the suitable surfactant among sodium dodecyl sulfate (SDS), Tween 20 (T-20), and Triton X-100 (TX-100) and its optimum additives to surfactant ratio. Dispersion stability of INLs has been investigated by using visual monitoring and dynamic light scattering. The analysis showed that additives start agglomeration and make larger clusters on the 10th and 20th days of formulation, respectively. On the 30th day of formulation, the larger clusters settle down in the bottom due to gravity. However, in spite of this pattern, the additives remain stable in vegetable oils at particular optimum additives to surfactant ratio. Four stable samples were recorded on the basis of dispersion stability analysis. Rice bran oil and IL1-based INLs having additives to TX-100 of 1:2 have found long-term stability. Additives to SDS ratios of 1:6 was found optimum for rice bran oil and IL2-based INLs. Similarly, for sesame oil-based INLs, the additives to T-20 ratios of 1:4 and 1:2 are found optimum for IL1 and IL2, respectively.
{"title":"Dispersion stability analysis of vegetable oil-based ionanolubricants","authors":"G. Kumar, H. Garg","doi":"10.1177/13506501241250368","DOIUrl":"https://doi.org/10.1177/13506501241250368","url":null,"abstract":"Recently, environmentally acceptable lubricants (EALs) developed from vegetable oils are more widely used in the field of lubrication technology as an alternative to mineral and synthetic oils. The homogeneous and long-term stability of additives in base lubricants is a crucial requirement for potential applications of vegetable oil-based ionanolubricants (INLs). In this study, the INLs have been formulated with two vegetable oils, rice bran oil and sesame oil containing TiO2 nanoparticles (NPs) and two ionic liquids IL1, 1-ethyl 3-methylimidazolium dicyanamide [EMIM][DCN] and IL2, trihexyltetradecylphosphonium bis(24,4-trimethylpentyl) phosphinate ([P66614][BTMPP]) with surfactants. The main objective is to find the suitable surfactant among sodium dodecyl sulfate (SDS), Tween 20 (T-20), and Triton X-100 (TX-100) and its optimum additives to surfactant ratio. Dispersion stability of INLs has been investigated by using visual monitoring and dynamic light scattering. The analysis showed that additives start agglomeration and make larger clusters on the 10th and 20th days of formulation, respectively. On the 30th day of formulation, the larger clusters settle down in the bottom due to gravity. However, in spite of this pattern, the additives remain stable in vegetable oils at particular optimum additives to surfactant ratio. Four stable samples were recorded on the basis of dispersion stability analysis. Rice bran oil and IL1-based INLs having additives to TX-100 of 1:2 have found long-term stability. Additives to SDS ratios of 1:6 was found optimum for rice bran oil and IL2-based INLs. Similarly, for sesame oil-based INLs, the additives to T-20 ratios of 1:4 and 1:2 are found optimum for IL1 and IL2, respectively.","PeriodicalId":509096,"journal":{"name":"Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology","volume":"16 15","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141018919","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The lubrication and dynamic behavior of the orbiting scroll (OS) is crucial to understanding and controlling the leakage between working chambers and the contact between scrolls in the compressor. In this study, a novel comprehensive model consisting of the OS, bearings, rotor, and frames is developed and validated by experiments. This paper demonstrates, for the first time through the tribo-dynamics analysis method, that the rotor dynamics have a significant impact on the flank gap size between scrolls via the interaction of the sliding bearings. The reduction of actual orbiting radii of OS is found to be caused by the bending and tilting of the rotor. However, though increased rotational speeds can narrow the flank gaps, the impact between scrolls should be addressed in these cases. The tribo-dynamic analysis illuminates the direction of the optimal design of compression components in the scroll compressor.
{"title":"Transient multibody tribo-dynamics analysis of the orbiting scroll in a three-bearing scroll compressor","authors":"Che Wang, Zibo Zhao, Zhaodong Zhang, Hua Zhong, Junming Cheng, Jianhua Wu","doi":"10.1177/13506501241248547","DOIUrl":"https://doi.org/10.1177/13506501241248547","url":null,"abstract":"The lubrication and dynamic behavior of the orbiting scroll (OS) is crucial to understanding and controlling the leakage between working chambers and the contact between scrolls in the compressor. In this study, a novel comprehensive model consisting of the OS, bearings, rotor, and frames is developed and validated by experiments. This paper demonstrates, for the first time through the tribo-dynamics analysis method, that the rotor dynamics have a significant impact on the flank gap size between scrolls via the interaction of the sliding bearings. The reduction of actual orbiting radii of OS is found to be caused by the bending and tilting of the rotor. However, though increased rotational speeds can narrow the flank gaps, the impact between scrolls should be addressed in these cases. The tribo-dynamic analysis illuminates the direction of the optimal design of compression components in the scroll compressor.","PeriodicalId":509096,"journal":{"name":"Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology","volume":"33 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140660858","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-04-17DOI: 10.1177/13506501241246845
Abhijit Bhowmik, Biplab Bhattacharjee, Abayomi Adewale Akinwande, Prasanta Majumder, J. Giri, P. Satish Kumar, J. Katiyar
The utilization of TiB2 particle reinforcement in aluminium matrix composites, particularly with Al6063, has been explored in this study for its resilience to mechanical erosion, low oxidation rate, and excellent heat conductivity. The composite was produced using stir casting with 9 wt% TiB2. The investigation focuses on wear behaviour, examining three key process parameters such as load, sliding speed, and covering sliding distance across four settings to identify the optimal combination for achieving a favourable wear rate. Statistical analysis of variance reveals significant differences among the tested parameters. Conclusively, the study highlights the superiority of the grey-fuzzy approach over a simple grey relational grade in validating decision-making for wear performance attributes. The research identifies the ost significant grey relational grade and grey fuzzy grade values as 0.913 and 0.902, respectively. These values correspond to optimal operating conditions, specifically a 15 N load, a sliding speed of 15 m/s, and a sliding distance of 1200 m. The findings underscore the efficacy of the grey-fuzzy technique in authenticating decision-making processes related to wear performance characteristics, emphasizing its superiority over relying solely on a plain grey relational grade.
本研究探讨了在铝基复合材料（尤其是与 Al6063 混合的复合材料）中使用 TiB2 粒子增强材料的问题，因为 TiB2 具有抗机械侵蚀、低氧化率和出色的导热性能。复合材料采用搅拌铸造法生产，TiB2 含量为 9 wt%。研究重点是磨损行为，考察了三种关键工艺参数，如负载、滑动速度和四种设置下的覆盖滑动距离，以确定实现良好磨损率的最佳组合。方差统计分析显示，测试参数之间存在显著差异。总之，该研究强调了灰色模糊方法在验证磨损性能属性决策方面优于简单的灰色关系等级。研究发现，最显著的灰色关系等级和灰色模糊等级值分别为 0.913 和 0.902。这些值与最佳运行条件相对应，特别是 15 N 的载荷、15 m/s 的滑动速度和 1200 m 的滑动距离。研究结果强调了灰色模糊技术在验证与磨损性能特征相关的决策过程中的有效性，突出了其优于单纯的灰色关系等级。
{"title":"Optimization of tribological performance of TiB2-reinforced Al6063 composite using grey-fuzzy tool","authors":"Abhijit Bhowmik, Biplab Bhattacharjee, Abayomi Adewale Akinwande, Prasanta Majumder, J. Giri, P. Satish Kumar, J. Katiyar","doi":"10.1177/13506501241246845","DOIUrl":"https://doi.org/10.1177/13506501241246845","url":null,"abstract":"The utilization of TiB2 particle reinforcement in aluminium matrix composites, particularly with Al6063, has been explored in this study for its resilience to mechanical erosion, low oxidation rate, and excellent heat conductivity. The composite was produced using stir casting with 9 wt% TiB2. The investigation focuses on wear behaviour, examining three key process parameters such as load, sliding speed, and covering sliding distance across four settings to identify the optimal combination for achieving a favourable wear rate. Statistical analysis of variance reveals significant differences among the tested parameters. Conclusively, the study highlights the superiority of the grey-fuzzy approach over a simple grey relational grade in validating decision-making for wear performance attributes. The research identifies the ost significant grey relational grade and grey fuzzy grade values as 0.913 and 0.902, respectively. These values correspond to optimal operating conditions, specifically a 15 N load, a sliding speed of 15 m/s, and a sliding distance of 1200 m. The findings underscore the efficacy of the grey-fuzzy technique in authenticating decision-making processes related to wear performance characteristics, emphasizing its superiority over relying solely on a plain grey relational grade.","PeriodicalId":509096,"journal":{"name":"Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology","volume":" 11","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140691312","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-04-17DOI: 10.1177/13506501241247616
BN Sharath, P. Madhu, Akarsh Verma
In the present investigation, a systematic experimental wear study at room temperature on Al2618 and reinforced Al2618 in the solutionized state, and after each pass of equal channel angular pressing (ECAP) was taken up to obtain a fundamental understanding of the wear behaviour and generate reference data on wear properties. The authors prepared a hybrid composite using Al2618 with boron carbide (5 wt.%) and graphite (5 wt.%) by the stir casting process. Solution treated cylindrical specimens of Al2618 and reinforced Al2618 were subjected to four passes of ECAP through a 120° die at room temperature using the processing route (BC). From the results point of view, microhardness measurements were carried out at room temperature on the specimens from the solutionized work piece before and after each pass of ECAP. Scanning electron microscope and X-ray diffraction techniques were used to conduct the microstructural studies. After three passes through both routes, the microstructure showed elongated grains with many dislocations; and after four passes, the microstructure depicted nearly equiaxed grains. Sub micrometre sized grains were produced after three passes of ECAP. Moreover, there was a monotonic increase in the hardness values with an increase in the number of passes. Finally, we reported that there was an improvement in the wear resistance of Al2618 and reinforced Al2618 subjected to ECAP process. This scrutiny may accelerate the applications of aluminium alloys in the industrial sector.
{"title":"Wear behaviour of aluminium-based hybrid composites processed by equal channel angular pressing","authors":"BN Sharath, P. Madhu, Akarsh Verma","doi":"10.1177/13506501241247616","DOIUrl":"https://doi.org/10.1177/13506501241247616","url":null,"abstract":"In the present investigation, a systematic experimental wear study at room temperature on Al2618 and reinforced Al2618 in the solutionized state, and after each pass of equal channel angular pressing (ECAP) was taken up to obtain a fundamental understanding of the wear behaviour and generate reference data on wear properties. The authors prepared a hybrid composite using Al2618 with boron carbide (5 wt.%) and graphite (5 wt.%) by the stir casting process. Solution treated cylindrical specimens of Al2618 and reinforced Al2618 were subjected to four passes of ECAP through a 120° die at room temperature using the processing route (BC). From the results point of view, microhardness measurements were carried out at room temperature on the specimens from the solutionized work piece before and after each pass of ECAP. Scanning electron microscope and X-ray diffraction techniques were used to conduct the microstructural studies. After three passes through both routes, the microstructure showed elongated grains with many dislocations; and after four passes, the microstructure depicted nearly equiaxed grains. Sub micrometre sized grains were produced after three passes of ECAP. Moreover, there was a monotonic increase in the hardness values with an increase in the number of passes. Finally, we reported that there was an improvement in the wear resistance of Al2618 and reinforced Al2618 subjected to ECAP process. This scrutiny may accelerate the applications of aluminium alloys in the industrial sector.","PeriodicalId":509096,"journal":{"name":"Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology","volume":"130 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140694298","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-04-15DOI: 10.1177/13506501241246841
Fayaz A Mir, N. Z. Khan, K. Sheikh, I. Badruddin, S. Kamangar
Hybrid structures, incorporating both aluminum and steel, hold potential for applications in automobile, aerospace, and marine industries. This research delves into the effects of friction stir welding on dissimilar joints (AA2024-T3 and SS304), with a focus on microstructural, mechanical, and tribological aspects. The study identifies optimal welding conditions at (tool rotational speed 710 r/min, traverse speed20 mm/min, tool pin offset1.5 mm towards aluminum, and tilt angle of 1.75 deg) that yield a well-defined joint interface, contrasting with flaws observed at a 40 mm/min traverse speed due to insufficient heat input. Under optimal conditions at 20 mm/min, a well-clean serrated interface, defect-free microstructural evolution, improved surface characteristics; enhanced mechanical performance resulting in higher ultimate tensile strength of 319 MPa with joint efficiency of 72.5 and better tribological performance were achieved with lower wear rate of 1.1607 × 10−5 g/Nm compared to those at 40 mm/min, highlighting the crucial role of optimized friction stir welding parameters in achieving high-quality dissimilar joints with desirable properties.
{"title":"Performance analysis of Al stainless steel joints fabricated by friction stir welding: Microstructure, mechanical, and tribology","authors":"Fayaz A Mir, N. Z. Khan, K. Sheikh, I. Badruddin, S. Kamangar","doi":"10.1177/13506501241246841","DOIUrl":"https://doi.org/10.1177/13506501241246841","url":null,"abstract":"Hybrid structures, incorporating both aluminum and steel, hold potential for applications in automobile, aerospace, and marine industries. This research delves into the effects of friction stir welding on dissimilar joints (AA2024-T3 and SS304), with a focus on microstructural, mechanical, and tribological aspects. The study identifies optimal welding conditions at (tool rotational speed 710 r/min, traverse speed20 mm/min, tool pin offset1.5 mm towards aluminum, and tilt angle of 1.75 deg) that yield a well-defined joint interface, contrasting with flaws observed at a 40 mm/min traverse speed due to insufficient heat input. Under optimal conditions at 20 mm/min, a well-clean serrated interface, defect-free microstructural evolution, improved surface characteristics; enhanced mechanical performance resulting in higher ultimate tensile strength of 319 MPa with joint efficiency of 72.5 and better tribological performance were achieved with lower wear rate of 1.1607 × 10−5 g/Nm compared to those at 40 mm/min, highlighting the crucial role of optimized friction stir welding parameters in achieving high-quality dissimilar joints with desirable properties.","PeriodicalId":509096,"journal":{"name":"Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology","volume":"51 15","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140701457","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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