Mechanics & Industry最新文献_第7页

Theory and experimental research on spiral bevel gear by double-side milling method 螺旋锥齿轮双面铣削的理论与实验研究

IF 1.2 4区工程技术

Mechanics & Industry Pub Date : 2021-01-01 DOI: 10.1051/MECA/2021032

Longlong Geng, Xiaozhong Deng, Hua Zhang, S. Nie, Chuang Jiang

引用次数: 1

Valve-seat components in a diesel engine: a tribological approach to limit wear 柴油机的阀座部件:限制磨损的摩擦学方法

IF 1.2 4区工程技术

Mechanics & Industry Pub Date : 2021-01-01 DOI: 10.1051/meca/2021043

Martial Crozet, Y. Berthier, A. Saulot, David Jones, B. Bou-Saïd

{"title":"Valve-seat components in a diesel engine: a tribological approach to limit wear","authors":"Martial Crozet, Y. Berthier, A. Saulot, David Jones, B. Bou-Saïd","doi":"10.1051/meca/2021043","DOIUrl":"https://doi.org/10.1051/meca/2021043","url":null,"abstract":"Within diesel engines, the valve-seat contact is one of the few non-lubricated contacts which is subjected to significant degradation. This degradation is put in evidence by material removal at the intake valve. The material pull out is promoted by the replication of combustion cycles (500 million) and severe operating conditions (pressure 18 MPa). The wear can lead to gas leakage and engine failure. The target of this work was to identify the main parameters affecting this wear. Our approach was based on the tribological triplet and material flows within the contact involving both numerical and experimental approaches. A dynamic model and a valvetrain test bench showed that the wear flows could be activated by the architecture of the valve opening system. Consequently, the limitation of these flows can be obtained by controlling the “global” geometry of the system and therefore without modifying the properties of the materials. In the same way, a finite element model of the local response of the seat-valve contact highlighted the impact of the “local” geometry of the contact. The change of this geometry is a lever to limit the shearing forces which reduces the tearing of the particles and therefore wear. Finally, tests carried out on the engine and on a specifically adapted test bench completed the understanding of degradation mechanisms (source flow, wear flow, etc.). Morphological interpretations of worn surfaces in terms of material flows allowed the understanding of the build-up stages of a protective layer. One solution to promote this internal flow is the use of pollutants from combustion. For example, the burned oil in contact, which is a priori harmful, becomes an opportunity here. In addition, un-burned hydrocarbons from the combustion of biodiesel help to protect the contact.","PeriodicalId":49018,"journal":{"name":"Mechanics & Industry","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90654392","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

A three-dimensional finite element-approach to investigate the optimum cutting parameters in machining AA2024 采用三维有限元方法研究AA2024加工的最佳切削参数

IF 1.2 4区工程技术

Mechanics & Industry Pub Date : 2020-12-04 DOI: 10.1051/meca/2020087

H. Ijaz, M. Danish, M. Asad, S. Rubaiee

{"title":"A three-dimensional finite element-approach to investigate the optimum cutting parameters in machining AA2024","authors":"H. Ijaz, M. Danish, M. Asad, S. Rubaiee","doi":"10.1051/meca/2020087","DOIUrl":"https://doi.org/10.1051/meca/2020087","url":null,"abstract":"This research work presents a numerical study of the orthogonal cutting process employing a finite element approach to optimize dry machining of aluminium alloy 2024. The main objective of the research work is to perform three-dimensional finite element simulations for a better understanding of temperature distribution and residual stresses development in the workpiece and tool regions along depth of cut direction. While, two-dimensional models don't predict true picture of aforesaid parameters along cutting depth due to material's out of plane flow and deformation. In the present study, effects of tool rake angles (7°, 14°, 21°) and cutting speeds (200, 400, 800 m/min) upon variations in chip geometry at various sections along workpiece width (depth of cut) have been discussed at large. Furthermore, cutting forces and tool-workpiece temperature profiles are also in depth analysed. The findings will lead the manufacturers to better decide post machining processes like heat treatment, deburring, surface treatments, etc. The results showed that a combination of a rake angle of 14° at cutting velocity of 800 m/min produces serrated chip segments with relatively moderate cutting forces in comparison to other parametric combinations. The efficacy of the presented finite element model is verified by comparing the numerically obtained results with experimental ones.","PeriodicalId":49018,"journal":{"name":"Mechanics & Industry","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2020-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87577639","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4

Pulsating minimum quantity lubrication assisted high speed turning on bio-medical Ti-6Al-4V ELI Alloy: An experimental investigation 脉动最小量润滑辅助生物医用Ti-6Al-4V ELI合金高速转动的实验研究

IF 1.2 4区工程技术

Mechanics & Industry Pub Date : 2020-12-01 DOI: 10.1051/MECA/2020097

Ramanuj Kumar, A. Sahoo

引用次数: 10

Shape effects on aerodynamic loading of heliostats 定日镜气动载荷的形状影响

IF 1.2 4区工程技术

Mechanics & Industry Pub Date : 2020-11-27 DOI: 10.1051/meca/2020086

H. Merarda, M. Aksas, T. Andrianne

引用次数: 2

Experimental set-up and the associated model for squeal analysis 尖叫声分析的实验装置和相关模型

IF 1.2 4区工程技术

Mechanics & Industry Pub Date : 2020-11-01 DOI: 10.1051/meca/2019083

M. Duboc, V. Magnier, J. Brunel, P. Dufrénoy

引用次数: 3

Experimental investigation of various machining attributes and cost estimation during machining of hardened AISI 4340 steel with untreated and cryo treated cermet inserts 未处理和冷处理金属陶瓷刀片加工淬硬AISI 4340钢的各种加工特性及成本估算试验研究

IF 1.2 4区工程技术

Mechanics & Industry Pub Date : 2020-11-01 DOI: 10.1051/meca/2019082

Anshuman J. Das, Sudhansu Ranjan Das, S. Patel, B. Biswal

{"title":"Experimental investigation of various machining attributes and cost estimation during machining of hardened AISI 4340 steel with untreated and cryo treated cermet inserts","authors":"Anshuman J. Das, Sudhansu Ranjan Das, S. Patel, B. Biswal","doi":"10.1051/meca/2019082","DOIUrl":"https://doi.org/10.1051/meca/2019082","url":null,"abstract":"Now-a-days due to growing demand of high precision components to attain high performances, hardened steels with hardness above 45HRC have numerous applications in automotive gear, machine tool and die industry because of their superior characteristics (high thermal stability, high indentation resistance, high abrasiveness, low ductility and high value of hardness to modulus of elasticity ratio). For this, higher tool life of cutting inserts cryogenic treatment is considered as the most prominent method but no substantial researches have been found concerning the impact of cryogenic treatment on cermet inserts, especially in turning of hardened steels. Therefore, in the present experimental investigation, the comparative assessment of various responses such as cutting force, flank wear, crater wear, chip morphology and surface roughness were carried out during machining of hardened steel with both untreated and cryo-treated cermet inserts under dry cutting condition. Lastly, the input variables were optimized using Response Surface Methodology (RSM) to evaluate the tool life for the economic analysis. The experimental result demonstrated that the uncoated deep cryo-treated with tempered cermet insert delivered better results in comparison to other cermet inserts. According to cost analysis, uncoated and deep cryo-treated with tempered cermet insert was found to be the most cost saving among other cermet inserts at the optimum cutting condition.","PeriodicalId":49018,"journal":{"name":"Mechanics & Industry","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2020-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84289559","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Study on fatigue strength of SnSb11Cu6 babbitt-steel bimetal sliding bearing material prepared by MIG brazing MIG钎焊制备SnSb11Cu6巴氏钢双金属滑动轴承材料的疲劳强度研究

IF 1.2 4区工程技术

Mechanics & Industry Pub Date : 2020-10-01 DOI: 10.1051/meca/2019075

Xinbo Wang, Z. Yin, Yonghong Chen

{"title":"Study on fatigue strength of SnSb11Cu6 babbitt-steel bimetal sliding bearing material prepared by MIG brazing","authors":"Xinbo Wang, Z. Yin, Yonghong Chen","doi":"10.1051/meca/2019075","DOIUrl":"https://doi.org/10.1051/meca/2019075","url":null,"abstract":"The babbitt-steel bimetal sliding bearing material prepared by the MIG brazing has been applied in many fields. In the application, usually only the bonding force is tested, and the fatigue strength is not evaluated. For this reason, this study referred to the test method for the fatigue strength of bearing materials of internal combustion engines, used the sapphire test machine (Dana Glacier Vandervell Bearings, UK) to inspect the SnSb11Cu6 babbitt-steel bimetal material prepared by MIG brazing, and analyzed the test results in depth. The test results show that, the fatigue strength of the bimetal material is more than 40 MPa. In comparison, according to the same test method and conditions on the same sapphire test machine, the fatigue strength of the SnSb11Cu6 babbitt-steel bimetal bearing material obtained by the centrifugal casting method after optimizing process was usually around 35 MPa. Therefore, the MIG brazing could produce higher fatigue strength for SnSb11Cu6 babbitt-steel bimetal bearing material. In addition, in this study, the process of fatigue failure was usually that after the microcracks were generated on the surface, they expanded to the inside of the lining, thereby resulting in spalling. This study has guiding significance for engineering practice and scientific research.","PeriodicalId":49018,"journal":{"name":"Mechanics & Industry","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2020-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79269197","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Acoustic emission description from a damage and failure scenario of rotomoulded polyolefin sandwich structure subjected to internal pressure for storage applications 存储应用中受内部压力影响的滚塑聚烯烃夹层结构损伤和失效场景的声发射描述

IF 1.2 4区工程技术

Mechanics & Industry Pub Date : 2020-10-01 DOI: 10.1051/meca/2019077

E. Lainé, J. Grandidier, Maxime Cruz, Anne-Laure Gorge, Claire Bouvy, G. Vaes

{"title":"Acoustic emission description from a damage and failure scenario of rotomoulded polyolefin sandwich structure subjected to internal pressure for storage applications","authors":"E. Lainé, J. Grandidier, Maxime Cruz, Anne-Laure Gorge, Claire Bouvy, G. Vaes","doi":"10.1051/meca/2019077","DOIUrl":"https://doi.org/10.1051/meca/2019077","url":null,"abstract":"The aim of this paper is to study the damage mechanisms in a sandwich polymer structure that contains three layers: two polyolefin skins and the foam core (skin–foam–skin). Specific tests on structure associated with the acoustic emission (AE) technique and tomographic observations (RX) are used to identify the damage. Initially, a conventional tensile test was performed to correlate the acoustic emission with the initiation of plasticity and damage to a polyethylene sample. The results obtained are close to those observed in other studies and it is possible to separate the signal from cavitation and propagation of necking. The technique is then employed to capture the rupture of a polymer skin on a multilayer rotomoulded structure (bottle). Tests were carried out on this bottle under internal water pressure. Three tests are performed with more or less early interruptions in order to identify the first damage and understand their evolution. Different quantities (average frequency, RA value, etc.) are observed in order to quantify and understand the perceived damage. With the AE/RX correlation and mechanical behaviour, a scenario of structural damage is proposed.","PeriodicalId":49018,"journal":{"name":"Mechanics & Industry","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2020-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74881172","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Steady-state heat transfer in microcracked media 微裂纹介质中的稳态传热

IF 1.2 4区工程技术

Mechanics & Industry Pub Date : 2020-08-14 DOI: 10.1051/meca/2020034

Sharan Raj Rangasamy Mahendren, H. Welemane, O. Dalverny, A. Tongne

引用次数: 1