Tribology and Materials最新文献_第2页

Wear and flow rate problems on chutes in a rock crushing plant 岩石破碎厂溜槽的磨损和流速问题

Tribology and Materials Pub Date : 1900-01-01 DOI: 10.46793/tribomat.2022.016

Keshav Gopaul, S. Venkannah, M. Z. Dauhoo

{"title":"Wear and flow rate problems on chutes in a rock crushing plant","authors":"Keshav Gopaul, S. Venkannah, M. Z. Dauhoo","doi":"10.46793/tribomat.2022.016","DOIUrl":"https://doi.org/10.46793/tribomat.2022.016","url":null,"abstract":"Rock crushing plants cannot afford unforeseen breakdowns with the current boom in the construction sector. This paper discusses measures that can be used to predict wear on chutes in the plant so that predictive maintenance can be implemented. Some of the chutes used to transfer the materials are difficult to access. Failures of the chutes cause downtimes, which are untimely and costly. The objective of this research is to determine the wear rates of chutes. A chute system was designed, modelled and validated using the Solidworks® software and then imported into the EDEM® software to predict the failure of the chutes. Factors affecting the abrasion wear of the metal were determined and used as input parameters to perform a simulation on EDEM® to validate the wear recorded. The service life obtained for mild steel S275 was 731 hours and that of abrasion resistant steel Hardox® 400 was 1490 hours, and it was deduced that the difference in the value of hardness of the metals to that of the rocks they carry significantly affects the wear of the chutes. The software was also used to replicate the flow of boulders on chutes and an accelerated flow rate of 496 tons per hour (t/h) was achieved at an angle of elevation of 24.4°.","PeriodicalId":140630,"journal":{"name":"Tribology and Materials","volume":"2007 21","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"113966616","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}

引用次数: 1

Case study of testing different materials for seat belt retractor torsion bar by the means of finite element analysis 用有限元方法对不同材料的安全带伸缩杆进行了实例分析

Tribology and Materials Pub Date : 1900-01-01 DOI: 10.46793/tribomat.2022.017

B. Nituleasa, A. I. Radu, D. Motoc

引用次数: 0

Optimisation of tensile stress of poly(lactic acid) 3D printed materials using response surface methodology 利用响应面法优化聚乳酸3D打印材料的拉伸应力

Tribology and Materials Pub Date : 1900-01-01 DOI: 10.46793/tribomat.2022.009

M. Vorkapić, I. Mladenović, M. Pergal, Toni Ivanov, Marija Baltić

{"title":"Optimisation of tensile stress of poly(lactic acid) 3D printed materials using response surface methodology","authors":"M. Vorkapić, I. Mladenović, M. Pergal, Toni Ivanov, Marija Baltić","doi":"10.46793/tribomat.2022.009","DOIUrl":"https://doi.org/10.46793/tribomat.2022.009","url":null,"abstract":"Three-dimensional printed plastic products developed through fused deposition modelling (FDM) take long-term mechanical loading in most industrial prototypes. This article focuses on the impact of the 3D printing parameters, type of thermal treatment and variation of characteristic dimensions of standard specimens on the tensile properties of poly(lactic acid) (PLA) material. Two mediums were used for thermal treatment: NaCl powder and plaster. The specimens immersed in NaCl powder were heated to the melting temperature of the filament (200 °C), while the processing of the plastered specimens was performed at a temperature of 100 °C. After treatment, the specimens were cooled at room temperature (25 °C), and the dimensions of the annealed and untreated specimens were controlled. The tensile test of the specimens was performed on the universal test machine. The response surface methodology (RSM) is employed to predict the tensile stress by undertaking input parameters. The analysis of variance (ANOVA) results revealed that the untreated specimens, orientation –45/45 and layer thickness of 0.1 mm had the highest tensile stress value. Thermal treatment in plaster showed a significant increase in tensile strength, while the best specimens were obtained after treatment in NaCl, and all refer to the –45/45 (0.1 mm) orientation.","PeriodicalId":140630,"journal":{"name":"Tribology and Materials","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121209398","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}

引用次数: 2

Three-dimensional modelling of tensile behaviour for standard aluminium specimens 标准铝试样拉伸性能的三维建模

Tribology and Materials Pub Date : 1900-01-01 DOI: 10.46793/tribomat.2023.001

Zaigham Saeed Toor

{"title":"Three-dimensional modelling of tensile behaviour for standard aluminium specimens","authors":"Zaigham Saeed Toor","doi":"10.46793/tribomat.2023.001","DOIUrl":"https://doi.org/10.46793/tribomat.2023.001","url":null,"abstract":"The effect of specimen width and incorporation of a circular hole on the tensile behaviour of commercially available aluminium alloy AA 1100 was studied using finite element analysis (FEA) for convergence with the already published experimental work of other researchers. Static structural analysis was conducted to simulate tensile loading of Japanese industrial standard (JIS) specimen JIS Z 2201 No. 13B and No. 5 until the point of the ultimate tensile strength (UTS) was reached. A strain rate of 0.25 mm/s was used for both the neat specimen and the one bearing a circular hole of 8 mm in diameter at the centre of the specimen. The numerical results exhibited a good agreement with the experimental work by comparison of the percentage elongation for numerical and experimental data. The normal stresses calculated using analytical and numerical approaches also reflected a good convergence. For neat specimens of JIS Z 2201 No. 13B and No. 5, a 100 % increase in specimen width enhanced the load required to reach UTS by 100 %, while elongation was increased by 30 %. On the other hand, for specimens of JIS Z 2201 No. 13B and No. 5, bearing an 8 mm circular hole reduced the load required to reach UTS by 300 %, while elongation was only increased by 25 %. The 200 % decrease in load required to reach UTS and 57 % reduction in elongation was observed by incorporating an 8 mm circular hole in the neat specimens.","PeriodicalId":140630,"journal":{"name":"Tribology and Materials","volume":"38 4","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"113981035","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}

引用次数: 0

Driving cycles for studying brake wear particle emissions on an inertial brake dynamometer 在惯性制动测功仪上研究制动磨损颗粒排放的驾驶循环

Tribology and Materials Pub Date : 1900-01-01 DOI: 10.46793/tribomat.2023.006

S. Vasiljević, J. Lukić, D. Miloradović, J. Glišović

{"title":"Driving cycles for studying brake wear particle emissions on an inertial brake dynamometer","authors":"S. Vasiljević, J. Lukić, D. Miloradović, J. Glišović","doi":"10.46793/tribomat.2023.006","DOIUrl":"https://doi.org/10.46793/tribomat.2023.006","url":null,"abstract":"With the development of contemporary drive systems that have a lower or zero emission of exhaust products, a significant reduction in the harmful influence of traffic on the environment has been achieved, but today new pollutants have been identified on the vehicle. One of such non-exhaust pollutant are brakes whose wear can be a significant particulate matter (PM) contributor. Examining the mechanisms of the formation of particles during braking, and therefore, brake wear is becoming one of the important areas of research today. There are several tests and driving cycles that are applied during the research of the brakes, but they are not primarily defined for testing particle emissions during braking. UNECE (United Nations Economic Commission for Europe) has included in its plan the introduction of standardised cycles that will prescribe a brake cycle whose purpose will be to examine the formation of particles. The brake pads are made of a mixture of different materials that ensure the longevity and efficiency of the brake system and the applied materials have different wear intensities in certain operating conditions. The most common laboratory tests in this area are performed using inertial brake dynamometers. This paper presents an experimental planning method of quantifying the influence of some of the operating parameters (initial speed of the vehicle, braking pressure and vehicle’s load per one brake disc-pads friction pair) on the airborne particulate matter for four different brake pads materials during testing on an inertial brake dynamometer.","PeriodicalId":140630,"journal":{"name":"Tribology and Materials","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133320379","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}

引用次数: 1

Friction and deformation at convergent contacts in geotribological systems 地摩擦学系统中会聚接触的摩擦和变形

Tribology and Materials Pub Date : 1900-01-01 DOI: 10.46793/tribomat.2022.015

E. Assenova, Evgenia Kozhoukharova

{"title":"Friction and deformation at convergent contacts in geotribological systems","authors":"E. Assenova, Evgenia Kozhoukharova","doi":"10.46793/tribomat.2022.015","DOIUrl":"https://doi.org/10.46793/tribomat.2022.015","url":null,"abstract":"Geotribology reveals the application of a tribological approach to natural, e.g. nonmechanical inorganic tribosystems in the Earth's crust. It aims an integrated view over frictional phenomena in the Earth's crust and tracks the interweaving between the immense seismotectonic energy brought in and generated in the geotribological zones, and the evolution of destructive and constructive contact processes ending with the emergence of new mineral structures preserving system's life. A tribological application concerns the convergent contact deformations in geological objects with different rheology, in the movement of tectonic plates, leading to the emergence of obduction relief structures. Convergent geotribological contacts are places of tectonic collision between large rock plates forming the planetary zones of most active, both seismic and volcanic activity. A typical example is the obduction and subduction zones of two ongoing rock plates, one pushing under the other. Studies of the contact process in geotribozones provide an opportunity for tribology to explain new phenomena in the variety of contact deformations and their full cycle of evolution. Considering the necessity of using a tribological approach to geology when describing friction-induced deformations, the role of rheology, mechanisms of preliminary contact displacement and distribution of energy and energy density in the contact body is shown.","PeriodicalId":140630,"journal":{"name":"Tribology and Materials","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114197200","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}

引用次数: 0

Areas of green tribology: A review 绿色摩擦学领域综述

Tribology and Materials Pub Date : 1900-01-01 DOI: 10.46793/tribomat.2023.004

T. Babu, M. Akter

引用次数: 1

Wear and friction characterisation of some restorative dental materials 一些牙科修复材料的磨损和摩擦特性

Tribology and Materials Pub Date : 1900-01-01 DOI: 10.46793/tribomat.2022.004

Florencio S. Martínez-Cruz, M. Vite-Torres, Alejandra Moran-Reyes, Jorge A. Bravo-Mejía

{"title":"Wear and friction characterisation of some restorative dental materials","authors":"Florencio S. Martínez-Cruz, M. Vite-Torres, Alejandra Moran-Reyes, Jorge A. Bravo-Mejía","doi":"10.46793/tribomat.2022.004","DOIUrl":"https://doi.org/10.46793/tribomat.2022.004","url":null,"abstract":"Dental wear is a complex field of tribology study, due to the combination of wear mechanisms, such as attrition, abrasion, erosion, and abfraction. The aim of the work was the study the wear in dental restorative materials, using a reciprocate tester in order to simulate the attrition in the oral cavity. This phenomenon occurs when sliding tooth against tooth, which generates considerable wear in the area of dental occlusion in the closed phase of mastication, and in the presence of parafunction such as bruxism. The experiments were performed employing ceramic (Ceramco 3), dental silver and, composite (Filtek Z350 XT) as restorative materials and nickel-chrome alloy as counter-body, using a reciprocating tribometer manufactured according to some parameters of standard ASTM G133-05. The geometrical configuration was a sphere on a flat plane. The experimental results obtained were volume loss and coefficient of friction of the different dental restorative materials. Also, wear mechanisms like plastic deformation, cracks, and delamination between others could be identified. Keywords: dental wear, attrition, dental restorative material, reciprocating movement, wear mechanisms.","PeriodicalId":140630,"journal":{"name":"Tribology and Materials","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132730744","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}

引用次数: 0

Tensile and flexural properties of polyester composites reinforced by iron filings 铁屑增强聚酯复合材料的拉伸和弯曲性能

Tribology and Materials Pub Date : 1900-01-01 DOI: 10.46793/tribomat.2022.020

Oluwafemi Emmanuel Ogundiji, G. M. Oyatogun

引用次数: 2

A model formulation for the prediction of churning power loss in worm gear transmission 蜗轮传动搅拌功率损失预测的模型公式

Tribology and Materials Pub Date : 1900-01-01 DOI: 10.46793/tribomat.2022.012

H. Chothani, K. Maniya

{"title":"A model formulation for the prediction of churning power loss in worm gear transmission","authors":"H. Chothani, K. Maniya","doi":"10.46793/tribomat.2022.012","DOIUrl":"https://doi.org/10.46793/tribomat.2022.012","url":null,"abstract":"Churning power loss is a complex process that causes significant loss of energy under splash lubrication of gear units. A set of empirical equations are available that allows for precise churning power losses calculation for only the parallel axis gears. The main objective of this study is to formulate a new mathematical model for worm gear based on the experiment result. The mathematical model is formulated using the dimensional analysis method and has been experimentally validated over a wide range of speeds in terms of revolutions, types of lubricants, lubricant temperature, and immersion depths. The simple direct torque measurement method was used to measure the churning loss. The influence of inertia force, viscous force, and gravitational forces were also investigated therefore correlations with Froude and Reynolds numbers are presented. Hardened steel and bronze were used as a material combination of worm and worm gear, respectively. A new formula for worm gear under splash lubrication has been derived and validated by comparison with experimental evidence. A very little discrepancy was found between the experiment result and the mathematical equation.","PeriodicalId":140630,"journal":{"name":"Tribology and Materials","volume":"AES-17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126539455","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}

引用次数: 0