Tribology and Materials最新文献

Modal analysis of composite plates: Digital image correlation method application 复合材料板模态分析:数字图像相关法的应用

Tribology and Materials Pub Date : 2023-07-01 DOI: 10.46793/tribomat.2023.010

Marija Baltić, M. Vorkapić, Milica Ivanović, Dragoljub Tanović, I. Mladenović

{"title":"Modal analysis of composite plates: Digital image correlation method application","authors":"Marija Baltić, M. Vorkapić, Milica Ivanović, Dragoljub Tanović, I. Mladenović","doi":"10.46793/tribomat.2023.010","DOIUrl":"https://doi.org/10.46793/tribomat.2023.010","url":null,"abstract":"Composite materials and structures are widely used and applied in many industries owing to their advantages, such as satisfactory stiffness-to-mass ratio and corrosion resistance. However, during their operating life, responsible parts subject to complex loads may change and their properties might deteriorate. To ensure structural integrity it is necessary to monitor and regularly check the performance of composite structures. This paper investigates the change of frequency characteristics of two rectangular composite (carbon-epoxy) plates after inflicting structural damage. Following the necessary preparation of the structure's upper surfaces by white-and-black stochastic pattern, the responses (free vibratory movement) of structures to momentary excitation were recorded by an optical, contactless 3D digital image correlation (DIC) system that contains a set of ultrafast cameras. In order to determine the natural frequencies of the plates, the recorded time-domain responses were post-processed, i.e. converted to the frequency domain by fast Fourier transform (FFT). The reduction in values of natural frequencies is observed on the damaged structures. The performed experiments demonstrate the applicability of the DIC method in the structural health monitoring of composite parts.","PeriodicalId":140630,"journal":{"name":"Tribology and Materials","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127115865","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

Comparison of the theoretical and experimental coefficient of friction for the brake disc-brake pad system 制动盘-刹车片系统摩擦系数的理论与实验比较

Tribology and Materials Pub Date : 2023-07-01 DOI: 10.46793/tribomat.2023.009

Mrunal P. Kshirsagar, H. Khairnar

{"title":"Comparison of the theoretical and experimental coefficient of friction for the brake disc-brake pad system","authors":"Mrunal P. Kshirsagar, H. Khairnar","doi":"10.46793/tribomat.2023.009","DOIUrl":"https://doi.org/10.46793/tribomat.2023.009","url":null,"abstract":"Contact between the automotive brake pad and the disc is mathematically modelled to estimate the coefficient of friction (COF). The mathematical model is proposed for the prognosis of the COF of brake pad material, by considering the contact mechanics between the interfacing surface and their material properties. The Greenwood-Williamson contact model is applied for rough contact surfaces for the estimation of the real contact radius. A MATLAB program has been formulated for generating the surface of brake pad material by considering its material properties which aid in the analytical evaluation of the COF. The proposed model is further validated with experimentation on pin-on-disc apparatus, as it is considered suitable for friction pad product testing according to previous research. The 25 pins were fabricated as per the ASTM G99 test for testing under varying loads and speeds. The obtained results showed that the range of COF has been between 0.2 and 0.4. The investigation presents an analytical approach for estimating COF and contact radius for brake disc and brake pad, which can be used to design an efficient automotive brake disc-brake pad system under the given load and rotational speed. The artificial neural network (ANN) is modelled for predicting the values of the COF for brake disc-brake pad systems, which can be further used for determining the tribological properties of new friction materials and their compatibility for efficient brake systems.","PeriodicalId":140630,"journal":{"name":"Tribology and Materials","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126403034","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

Study on mechanical and microstructural properties of advanced high-strength welded sheet metal 先进高强度焊接薄板的力学和显微组织性能研究

Tribology and Materials Pub Date : 2023-07-01 DOI: 10.46793/tribomat.2023.002

Serkan Damlacik, Zerrin Baydi, Seda Küpeli, Duygu Kaplan, Rabia Şevval Akan, M. Uludağ

{"title":"Study on mechanical and microstructural properties of advanced high-strength welded sheet metal","authors":"Serkan Damlacik, Zerrin Baydi, Seda Küpeli, Duygu Kaplan, Rabia Şevval Akan, M. Uludağ","doi":"10.46793/tribomat.2023.002","DOIUrl":"https://doi.org/10.46793/tribomat.2023.002","url":null,"abstract":"Continuous research is carried out in the automotive industry to decrease the weight of automobile bodies without reducing durability. For this purpose, the use of welding sheet metal is one of the successful techniques. Welded sheets are formed by combining two or more flat materials with different thicknesses and different mechanical properties, using the welding method, before being shaped in order to provide superior properties. This situation requires more attention during the shaping stages. It is important to calculate the pressures to be applied to the welding areas and to apply the shaping steps in a way that will not reduce the material strength. For this reason, the production stages of the dies to be used in the manufacture of these parts are just as important. In this study, an innovative die design is carried out for the production of welded sheet metal. The microstructure and mechanical properties of the welded sheet formed by the die were examined. The effect of the forces applied to the welding areas on the material and the mechanical properties of the materials of different thicknesses were determined. Within the scope of the study, microstructure analysis, hardness and tensile tests were carried out and the results were examined. When the results obtained were examined, it was seen that the strength and hardness values of the samples obtained from the welded area were higher than the other areas.","PeriodicalId":140630,"journal":{"name":"Tribology and Materials","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116944999","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

Electrical conductivity of graphene/Si3N4 doped PLA produced by fused filament fabrication 熔融丝法制备石墨烯/氮化硅掺杂PLA的电导率

Tribology and Materials Pub Date : 2023-07-01 DOI: 10.46793/tribomat.2023.007

Osman Dalar, A. Doğru, M. Karatay Kutman, F. Z. Biber Muftuler, C. Harmansah

{"title":"Electrical conductivity of graphene/Si3N4 doped PLA produced by fused filament fabrication","authors":"Osman Dalar, A. Doğru, M. Karatay Kutman, F. Z. Biber Muftuler, C. Harmansah","doi":"10.46793/tribomat.2023.007","DOIUrl":"https://doi.org/10.46793/tribomat.2023.007","url":null,"abstract":"Today, the technological, scientific and industrial use of micro- or nano-scale products has rapidly expanded. Nanoparticles are added to metal, ceramic and polymer materials to produce nanocomposite materials. Polymer matrix nanocomposites have advantages over other materials in terms of weight, performance and price. As known from the literature, imparting electrical conductivity to thermoplastic materials such as polylactic acid (PLA) is possible. The industrial use of thermoplastic matrix has been the focus of nanocomposites due to its low cost, ease of production and recycling. Research on the use of 3D printers in the production of nanoscale-doped thermoplastics has been less common. 3D printing is an additive manufacturing method compared to traditional processing methods. Additive manufacturing is based on adding layer by layer to reduce production costs and reduce the production cycle. This study prepared nanocomposite material by adding nano-sized graphene and Si3N4 to PLA material at 0.5, 1, 2 and 3 wt. %. The prepared polymer matrix nanocomposite groups were produced using a fused filament fabrication (FFF-3D) printer and their electrical conductivity was examined at the five different points by the four-point probe method. According to the test results, the electrical conductivities of 1 and 2 % doped PLA are very close. But the 1 % doped samples is the composite group with the best conductivity with a value of 153.44 S/m. A value of 151.25 S/m followed this for 2 % doped PLA and 138.57 S/m for 3 % doped PLA. Thus, it was concluded that the electrical conductivity was reduced with the increased dope rate. Also, all samples' hardness was measured by the Shore D test. Although the increase in the hardness value of the samples did not affect as much as the increase in the dope ratio, the hardness values increased with the increase in the nanoadditive ratio.","PeriodicalId":140630,"journal":{"name":"Tribology and Materials","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114468905","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

Selected technical ceramics as nanoreinforcement for polyvinyl butyral/epoxy polymer composites 精选工业陶瓷作为聚乙烯醇丁醛/环氧聚合物复合材料的纳米增强材料

Tribology and Materials Pub Date : 2023-07-01 DOI: 10.46793/tribomat.2023.008

Danica Bajić, Damjan Čekerevac, Milica Marjanović, S. Perković, Bojana Z. Fidanovski, C. Rigueiro

引用次数: 2

Numerical study of a centred crack on an elastoplastic material by the FEM method 弹塑性材料中心裂纹的有限元数值研究

Tribology and Materials Pub Date : 2023-01-01 DOI: 10.46793/tribomat.2023.011

Mohammed Bentahar

引用次数: 1

Skin as an interface: Understanding the synergy of dermatology, biomimetics and tribology 皮肤作为一个界面:理解皮肤学，仿生学和摩擦学的协同作用

Tribology and Materials Pub Date : 2023-01-01 DOI: 10.46793/tribomat.2023.013

Hakan Göçerler, Carsten Gachot, Philipp G. Grützmacher, Stefan J. Eder

{"title":"Skin as an interface: Understanding the synergy of dermatology, biomimetics and tribology","authors":"Hakan Göçerler, Carsten Gachot, Philipp G. Grützmacher, Stefan J. Eder","doi":"10.46793/tribomat.2023.013","DOIUrl":"https://doi.org/10.46793/tribomat.2023.013","url":null,"abstract":"This review explores the intersection of tribology and dermatology, explicitly focusing on studying the human skin and drawing inspiration from natural systems. It investigates animal adaptations and their implications for biotribological applications, with examples such as the friction anisotropy and wear tolerance of snakeskin, the healing properties of fish skin and the lotus effect for reducing adhesion in biomedical devices. Understanding human skin presents challenges due to its complex structure and variability influenced by age, gender, race and environment. The paper discusses in vivo and ex vivo measurements, substitute models replicating human skin properties and contact mechanics considerations. It explores contact models, measurement methods and factors impacting skin friction, emphasising the interplay between adhesion and deformation components. Techniques such as atomic force microscopy and the colloidal probe technique provide insights into mechanical properties and molecular interactions. By comprehending the complexities of human skin and its tribological behaviour, researchers can develop innovative solutions in areas ranging from soft robotics to medical research and aerospace technology.","PeriodicalId":140630,"journal":{"name":"Tribology and Materials","volume":"111 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135106520","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

Evaluation of hybrid spindle bearings with nitriding raceway steels under high rotational speeds 高转速下氮化滚道钢混合主轴轴承的性能评价

Tribology and Materials Pub Date : 2023-01-01 DOI: 10.46793/tribomat.2023.012

Marcus Gärtner, Christian Brecher, Stephan Neus, Leonardo Catana, Feliciano Greco, Guillermo Morales-Espejel, Defeng Lang

{"title":"Evaluation of hybrid spindle bearings with nitriding raceway steels under high rotational speeds","authors":"Marcus Gärtner, Christian Brecher, Stephan Neus, Leonardo Catana, Feliciano Greco, Guillermo Morales-Espejel, Defeng Lang","doi":"10.46793/tribomat.2023.012","DOIUrl":"https://doi.org/10.46793/tribomat.2023.012","url":null,"abstract":"The further development of high-precision bearings regarding higher speeds and load-carrying capacity is becoming increasingly challenging. One approach to meet the increased requirements is to use new high-performance raceway steels. Particularly for a highly stressed lubricant film, where seizure may occur, the bearing material properties can make a key contribution in increasing the lifetime. In the following, the test results of hybrid spindle bearings of type 7008 made of nitriding steel are analysed. The bearings were tested in an endurance run for a constant speed parameter of 2.5 million ndm and a maximum contact stress of 2,900 MPa at the inner ring contact. The operational behaviour was validated based on the bearing outer ring temperature and the acceleration level in the test rig. A further sample test in endurance runs with an increased speed parameter of 2.8 million ndm and a maximum contact stress of 3,200 MPa at the inner ring shows that the performance limit of the bearing is even higher than initially assumed. The microscope analyses of the bearing steels after the test show low wear. An analysis of the test conditions in terms of contact stresses, lifetime and the pv value illustrates that the bearings can run far above standard conditions. The experimental results show that the operational limits of hybrid spindle bearings with a raceway made of nitriding steels are significantly higher than expected.","PeriodicalId":140630,"journal":{"name":"Tribology and Materials","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135107193","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

A review on mechanical properties of aluminium-based metal matrix nanocomposites 铝基金属基纳米复合材料力学性能研究进展

Tribology and Materials Pub Date : 2023-01-01 DOI: 10.46793/tribomat.2023.014

Sandra Gajević, Lozica Ivanović, Aleksandar Skulić, Blaža Stojanović

{"title":"A review on mechanical properties of aluminium-based metal matrix nanocomposites","authors":"Sandra Gajević, Lozica Ivanović, Aleksandar Skulić, Blaža Stojanović","doi":"10.46793/tribomat.2023.014","DOIUrl":"https://doi.org/10.46793/tribomat.2023.014","url":null,"abstract":"Industrial production today requires new improved materials to meet market demands, which leads to the production of new materials with improved properties. One kind of response to those requirements is the development of metal matrix composites (MMCs) with the aim of obtaining materials with better properties when compared to conventional metals and alloys. Nowadays, metal matrix nanocomposites (MMnCs) are being increasingly investigated due to the possibility of achieving better machinability, high fracture toughness and improved ductility when compared to conventional composites. Considering the pace of development and the huge perspective of different classes of materials, this research aims to provide insight into the mechanical properties of aluminium nanocomposites. Aluminium nanocomposites are attracting a lot of attention due to their high strength-to-weight ratio, wear resistance and low costs, when compared to matrix alloy. In this paper, an attempt is made to review other research reports and make a connection between the characteristics of the microstructure and the mechanical properties, which are dependent on the method of fabrication and type and content of reinforcement.","PeriodicalId":140630,"journal":{"name":"Tribology and Materials","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135107581","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

Thermal contact resistance for stationary and moving heat sources in angular contact ball bearings 角接触球轴承中固定和运动热源的热接触电阻

Tribology and Materials Pub Date : 2023-01-01 DOI: 10.46793/tribomat.2023.015

Sebastian Cabezas, György Hegedűs, Péter Bencs

{"title":"Thermal contact resistance for stationary and moving heat sources in angular contact ball bearings","authors":"Sebastian Cabezas, György Hegedűs, Péter Bencs","doi":"10.46793/tribomat.2023.015","DOIUrl":"https://doi.org/10.46793/tribomat.2023.015","url":null,"abstract":"Sliding friction is a common tribological effect that occurs between the contact surfaces of the inner components (inner race, outer race and balls) of a spindle rolling bearing during operation. This friction generally generates heat, which can affect the performance of the rolling bearing. To date, numerous studies have assumed that the contact surface between the inner components of the bearing is circular and stationary. While this assumption has yielded adequate results, it is not sufficient in the case of angular contact ball bearings, where the contact surfaces are elliptical and could be treated as either stationary or moving heat sources. This paper presents solutions for both, stationary and moving heat sources for elliptical contact surfaces in a spindle rolling bearing. The primary objective is to find the thermal contact resistances which are dependent on the shape of contact, the loads, the rotational speed and the material properties thereof, applying the mathematical expressions developed by Muzychka and Yovanovich. These expressions were used to calculate various thermal resistances, providing results applicable to the analysis of thermal models in spindle rolling elements. Through finite element analysis (FEA) performed in Ansys Workbench, the stationary and moving heat sources were compared, finding the heat distribution along the elements of the bearing. The findings herein are suitable for the creation of thermal networks in rolling bearings, which are essential to predict their thermal behaviour.","PeriodicalId":140630,"journal":{"name":"Tribology and Materials","volume":"111 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135106529","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