International Journal of Mechanical and Materials Engineering最新文献

Synthesis and characterization of titanium oxynitride catalyst via direct ammonia nitridation of titanium polyacrylate for oxygen reduction reaction 通过氨氮直接氮化聚丙烯酸钛制备用于氧还原反应的氮化钛催化剂的合成与表征

IF 3.4

International Journal of Mechanical and Materials Engineering Pub Date : 2024-11-18 DOI: 10.1186/s40712-024-00189-1

Yushi Tamaki, Satoshi Seino, Naoki Shinyoshi, Yuta Uetake, Takaaki Nagai, Ryuji Monden, Akimitsu Ishihara, Takashi Nakagawa

{"title":"Synthesis and characterization of titanium oxynitride catalyst via direct ammonia nitridation of titanium polyacrylate for oxygen reduction reaction","authors":"Yushi Tamaki, Satoshi Seino, Naoki Shinyoshi, Yuta Uetake, Takaaki Nagai, Ryuji Monden, Akimitsu Ishihara, Takashi Nakagawa","doi":"10.1186/s40712-024-00189-1","DOIUrl":"10.1186/s40712-024-00189-1","url":null,"abstract":"<div>A titanium oxynitride catalyst for the oxygen reduction reaction (ORR) in polymer electrolyte fuel cells was synthesized through the direct ammonia nitridation of titanium complexes. Titanium polyacrylate was employed as the catalyst precursor, and the effect of the calcination temperature between 600 and 1000 °C on the catalyst structure was studied. The catalysts were characterized via X-ray diffraction, X-ray absorption spectroscopy, transmission electron microscopy, cyclic voltammetry, and powder electrical resistivity measurements. The formation of titanium oxynitride particles and deposited carbon was observed for all the samples; however, significant variations in the catalyst structure and catalytic activity were also observed. With an increase in the calcination temperature, nitridation of titanium oxynitride progressed, and the conductivity of the catalyst powder increased. The highest rest potential and ORR current density were achieved with calcination at 800 °C. Importantly, the results suggest that maintaining an optimal nitrogen doping level within the catalyst particles, along with ensuring the formation of electroconductive deposited carbon, is essential for achieving a high ORR current. This work introduces the direct ammonia nitridation of metal complexes as a promising process for designing metal oxynitride catalysts.</div>","PeriodicalId":592,"journal":{"name":"International Journal of Mechanical and Materials Engineering","volume":"19 1","pages":""},"PeriodicalIF":3.4,"publicationDate":"2024-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://jmsg.springeropen.com/counter/pdf/10.1186/s40712-024-00189-1","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142664473","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Some studies on Abelmoschus esculentus (Indian Okra) fiber characteristics 关于印度秋葵纤维特征的一些研究

IF 3.4

International Journal of Mechanical and Materials Engineering Pub Date : 2024-11-15 DOI: 10.1186/s40712-024-00188-2

Prafull Prabhakar Kolte, Vijay Sitaram Shivankar

引用次数: 0

Use of Taguchi method for high energy ball milling of CaCO3 田口法高能球磨碳酸钙的研究

IF 3.1

International Journal of Mechanical and Materials Engineering Pub Date : 2022-02-04 DOI: 10.1186/s40712-021-00140-8

Maya Radune, Svetlana Lugovskoy, Yaniv Knop, Avigdor Yankelevitch

{"title":"Use of Taguchi method for high energy ball milling of CaCO3","authors":"Maya Radune, Svetlana Lugovskoy, Yaniv Knop, Avigdor Yankelevitch","doi":"10.1186/s40712-021-00140-8","DOIUrl":"10.1186/s40712-021-00140-8","url":null,"abstract":"<div>Taguchi’s method was applied to investigate the effect of main high energy ball milling (HEBM) parameters: milling time (MT), ball to powder weight ratio (BPWR), and milling speed (MS) on the CaCO3 crystallite size. The settings of HEBM parameters were determined by using the L9 (33) orthogonal experiments array (OA). The as-received and milled powders were characterized by X-ray diffraction (XRD) scanning electron microscopy (SEM), Fourier transform infrared (FTIR) spectroscopy. The crystallite size of CaCO3 varied between 140 and 540 nm depending on the HEBM conditions. The analysis of variance (ANOVA) was used to find the significance and percentage of contribution of each milling parameter. It was established that the MT is the most effective parameter followed by MS and BPWR. A confirmation test was carried out with a 90% confidence level to illustrate the effectiveness of the Taguchi optimization method. The optimum milling parameter combination was determined by using the analysis of signal-to-noise (S/N) ratio. Based on the S/N ratio analysis, optimal HEBM conditions were found MT 10 h, MS 600 revolutions per minute (rpm), BPWR 50:1.</div>","PeriodicalId":592,"journal":{"name":"International Journal of Mechanical and Materials Engineering","volume":"17 1","pages":""},"PeriodicalIF":3.1,"publicationDate":"2022-02-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ijmme.springeropen.com/counter/pdf/10.1186/s40712-021-00140-8","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4157257","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Prediction of buckling force in hourglass-shaped specimens 沙漏形试件屈曲力的预测

IF 3.1

International Journal of Mechanical and Materials Engineering Pub Date : 2021-06-29 DOI: 10.1186/s40712-021-00132-8

Ragnar Gjengedal, Ørjan Fyllingen, Vojtech Heinik

{"title":"Prediction of buckling force in hourglass-shaped specimens","authors":"Ragnar Gjengedal, Ørjan Fyllingen, Vojtech Heinik","doi":"10.1186/s40712-021-00132-8","DOIUrl":"https://doi.org/10.1186/s40712-021-00132-8","url":null,"abstract":"It is important to avoid buckling during low-cycle fatigue testing. The buckling load is dependent on the specimen shape, material properties, and the testing machine. In the present investigation of hourglass-shaped specimens the importance of the diameter to radius of curvature is examined. Diameters of 5 and 7 mm are examined with a ratio of radius of curvature to diameter of 4, 6, and 8. The machine used is an Instron 8800 with elongated rods for a climate chamber. This leads to a reduced stiffness of the machine during compression testing. A finite element model (in Abaqus) is developed to identify the critical buckling force. For hourglass-shaped specimens, buckling means onset of sideways movement, without a drop in the applied load which is typical for conventional Euler buckling. The onset of sideways movement is identified experimentally by analysis of the data from extensometer and the load cell. This model is verified by experiments and fits within 0.6 to ? 11% depending on the specimen diameter and diameter to radius of curvature ratio. The smallest deviations are obtained for the 7-mm-diameter specimen with deviation varying from 0.6 to ? 3.3% between the model and the experiments. The current investigation is done with a commercially available hot rolled structural steel bar of ?16 mm.","PeriodicalId":592,"journal":{"name":"International Journal of Mechanical and Materials Engineering","volume":"16 1","pages":""},"PeriodicalIF":3.1,"publicationDate":"2021-06-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1186/s40712-021-00132-8","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"5124998","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

Friction and contact temperature in dry rolling-sliding contacts with MoS2-bonded and a-C:H:Zr DLC coatings mos2和a-C:H:Zr DLC涂层干滚滑接触的摩擦和接触温度

IF 3.1

International Journal of Mechanical and Materials Engineering Pub Date : 2021-06-15 DOI: 10.1186/s40712-021-00129-3

Stefan Hofmann, Mustafa Yilmaz, Enzo Maier, Thomas Lohner, Karsten Stahl

{"title":"Friction and contact temperature in dry rolling-sliding contacts with MoS2-bonded and a-C:H:Zr DLC coatings","authors":"Stefan Hofmann, Mustafa Yilmaz, Enzo Maier, Thomas Lohner, Karsten Stahl","doi":"10.1186/s40712-021-00129-3","DOIUrl":"https://doi.org/10.1186/s40712-021-00129-3","url":null,"abstract":"Gearboxes are usually lubricated with oil or grease to reduce friction and wear and to dissipate heat. However, gearbox applications that cannot be lubricated with oil or grease, for example in the space or food industry, are commonly lubricated with solid lubricants. Especially solid lubricants with a lamellar sliding mechanism like graphite and molybdenum disulfide (MoS2) or diamond-like carbon (DLC) coatings can enable very low coefficients of friction. This study investigates the friction and temperature behavior of surface coatings in rolling-sliding contacts for the application in dry lubricated gears. In an experimental setup on a twin-disk test rig, case-hardened steel 16MnCr5E (AISI5115) is considered as substrate material together with an amorphous, hydrogenated, and metal-containing a-C:H:Zr DLC coating (ZrCg) and a MoS2-bonded coating (MoS2-BoC). The friction curves show reduced coefficients of friction and a significantly increased operating area for both surface coatings. Due to the sufficient electrical insulation of the MoS2-BoC, the application of thin-film temperature measurement-known from lubricated contacts-was successfully transfered to dry rolling-sliding contacts. The results of the contact temperature measurements reveal pronounced thermal insulation with MoS2-BoC, which can interefere the sliding mechanism of MoS2 by accelerated oxidation. The study shows that the application of dry lubricated gears under ambient air conditions is challenging as the tribological and thermal behavior requires tailored surface coatings.","PeriodicalId":592,"journal":{"name":"International Journal of Mechanical and Materials Engineering","volume":"16 1","pages":""},"PeriodicalIF":3.1,"publicationDate":"2021-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1186/s40712-021-00129-3","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4902510","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

Effect of cone angle of cylindrical pin in the SFSW and DFSW on mechanical properties of AA6061-T6 alloy SFSW和DFSW中圆柱销锥角对AA6061-T6合金力学性能的影响

IF 3.1

International Journal of Mechanical and Materials Engineering Pub Date : 2021-06-12 DOI: 10.1186/s40712-021-00131-9

Mahdi Kazemi, Amir Ghiasvand

{"title":"Effect of cone angle of cylindrical pin in the SFSW and DFSW on mechanical properties of AA6061-T6 alloy","authors":"Mahdi Kazemi, Amir Ghiasvand","doi":"10.1186/s40712-021-00131-9","DOIUrl":"https://doi.org/10.1186/s40712-021-00131-9","url":null,"abstract":"In the present study, the effect of cone angle of tool pin on the mechanical properties and microhardness properties of aluminum alloy AA6061-T6 specimens is investigated for three processes of SFSW, symmetric DFSW, and asymmetric DFSW. In each of the mentioned welding processes, tools with 5 different conical angles of 0, 5, 10, 15, and 20° are used. In these three welding processes, the mechanical properties of the final welded joint with conical tools have been enhanced noticeably compared to the tool with simple cylindrical pins (0° angle). Based on the obtained results, it was found that the joints obtained from asymmetric DFSW, symmetric DFSW, and SFSW had the best mechanical properties, respectively. The optimum cone angles for tool pin in SFSW, symmetric DFSW, and asymmetric DFSW processes were equal to 15, 10, and 10°, respectively. In addition, it was concluded that the welded specimen through the asymmetric DFSW with the cone angle of 10° attained the closest mechanical properties to the base (parent) metal. The parameters of YS, UTS, and E% in this sample were 78.3%, 84.8%, and 86.4% of the base sample, respectively.","PeriodicalId":592,"journal":{"name":"International Journal of Mechanical and Materials Engineering","volume":"16 1","pages":""},"PeriodicalIF":3.1,"publicationDate":"2021-06-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1186/s40712-021-00131-9","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4502211","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

Development of calcium fluoride thin film on Ti-6Al-4V material by a dip coating process with an intermediate shellac layer for biocompatible orthopedic applications 在Ti-6Al-4V材料上浸涂中间紫胶层制备生物相容性矫形用氟化钙薄膜

IF 3.1

International Journal of Mechanical and Materials Engineering Pub Date : 2021-05-31 DOI: 10.1186/s40712-021-00130-w

A. Ritwik, K. K. Saju

{"title":"Development of calcium fluoride thin film on Ti-6Al-4V material by a dip coating process with an intermediate shellac layer for biocompatible orthopedic applications","authors":"A. Ritwik, K. K. Saju","doi":"10.1186/s40712-021-00130-w","DOIUrl":"https://doi.org/10.1186/s40712-021-00130-w","url":null,"abstract":"Calcium fluoride (CaF2) is widely used for different bio applications ranging from biomedical imaging to cell labeling. The biocompatible properties of CaF2 combined with superior mechanical properties of titanium alloy makes it a perfect choice for orthopedic and dental implants. A dip-coating process was employed to develop a thin film of CaF2 coating on Ti6Al4V material with an intermediate thin layer of shellac (natural resin). The developed coating was subjected to X-ray powder diffraction method (XRD) and scanning electron microscopy (SEM) to evaluate the surface characteristics. The dip-coated implant material was also subjected to mechanical property evaluation, dissolution behavior study, and corrosion behavior study. In vitro study of the developed implant material was also carried out to assess the biocompatibility. The obtained results suggest use of CaF2 coating developed by this method for producing biocompatible orthopedic implants.","PeriodicalId":592,"journal":{"name":"International Journal of Mechanical and Materials Engineering","volume":"16 1","pages":""},"PeriodicalIF":3.1,"publicationDate":"2021-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1186/s40712-021-00130-w","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4066042","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: 3

Study of biaxial mechanical properties of the passive pig heart: material characterisation and categorisation of regional differences 被动猪心脏双轴力学性能的研究:材料表征和区域差异的分类

IF 3.1

International Journal of Mechanical and Materials Engineering Pub Date : 2021-04-20 DOI: 10.1186/s40712-021-00128-4

Fulufhelo Nemavhola

{"title":"Study of biaxial mechanical properties of the passive pig heart: material characterisation and categorisation of regional differences","authors":"Fulufhelo Nemavhola","doi":"10.1186/s40712-021-00128-4","DOIUrl":"https://doi.org/10.1186/s40712-021-00128-4","url":null,"abstract":"Regional mechanics of the heart is vital in the development of accurate computational models for the pursuit of relevant therapies. Challenges related to heart dysfunctioning are the most important sources of mortality in the world. For example, myocardial infarction (MI) is the foremost killer in sub-Saharan African countries. Mechanical characterisation plays an important role in achieving accurate material behaviour. Material behaviour and constitutive modelling are essential for accurate development of computational models. The biaxial test data was utilised to generated Fung constitutive model material parameters of specific region of the pig myocardium. Also, Choi-Vito constitutive model material parameters were also determined in various myocardia regions. In most cases previously, the mechanical properties of the heart myocardium were assumed to be homogeneous. Most of the computational models developed have assumed that the all three heart regions exhibit similar mechanical properties. Hence, the main objective of this paper is to determine the mechanical material properties of healthy porcine myocardium in three regions, namely left ventricle (LV), mid-wall/interventricular septum (MDW) and right ventricle (RV). The biomechanical properties of the pig heart RV, LV and MDW were characterised using biaxial testing. The biaxial tests show the pig heart myocardium behaves non-linearly, heterogeneously and anisotropically. In this study, it was shown that RV, LV and MDW may exhibit slightly different mechanical properties. Material parameters of two selected constitutive models here may be helpful in regional tissue mechanics, especially for the understanding of various heart diseases and development of new therapies.","PeriodicalId":592,"journal":{"name":"International Journal of Mechanical and Materials Engineering","volume":"16 1","pages":""},"PeriodicalIF":3.1,"publicationDate":"2021-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1186/s40712-021-00128-4","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4776678","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: 4

Experimental investigations and empirical relationship on the influence of innovative hub geometry in a centrifugal fan for performance augmentation 创新轮毂几何形状对离心风机性能提升影响的实验研究及经验关系

IF 3.1

International Journal of Mechanical and Materials Engineering Pub Date : 2021-03-19 DOI: 10.1186/s40712-021-00127-5

N. Madhwesh, K. Vasudeva Karanth, N. Yagnesh Sharma

{"title":"Experimental investigations and empirical relationship on the influence of innovative hub geometry in a centrifugal fan for performance augmentation","authors":"N. Madhwesh, K. Vasudeva Karanth, N. Yagnesh Sharma","doi":"10.1186/s40712-021-00127-5","DOIUrl":"https://doi.org/10.1186/s40712-021-00127-5","url":null,"abstract":"One of the problem areas of fluid flow in the turbomachine is its inlet region, manifested by flow distortions due to the induced fluid swirl accompanied by improper flow incidence onto the impeller. Further, the hub forms one of the main components of many of the turbomachines and it is found that there has not been significant study on geometrical modifications of the same in centrifugal fans for augmented performance. This is partially due to designers trying to reduce the cost of the overall machine.There is a scope for detailed parametric study and the present work involves an exploration of flow behavior by parametric variation of hub geometry in terms of both its shape and size.Experiments are carried out in order to determine the importance of hub with different size and shapes. The geometric models of hemi-spherical and ellipsoidal hubs are considered for the analyses in the present study.An optimized ellipsoidal hub configuration is found to yield a relative improvement of about 7.5% for head coefficient and 7.7% increase in relative theoretical efficiency over the hub-less base configuration. Finally, correlations are developed for the optimized hub shape configurations.It is revealed from experimental analysis that hub plays a vital role in streamlining the flow at the inlet to the centrifugal fan and augments its performance.","PeriodicalId":592,"journal":{"name":"International Journal of Mechanical and Materials Engineering","volume":"16 1","pages":""},"PeriodicalIF":3.1,"publicationDate":"2021-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1186/s40712-021-00127-5","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4758027","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

Mathematical modeling of auxetic systems: bridging the gap between analytical models and observation 辅助系统的数学建模:弥合分析模型与观测之间的差距

IF 3.1

International Journal of Mechanical and Materials Engineering Pub Date : 2021-03-17 DOI: 10.1186/s40712-020-00125-z

James N. Grima-Cornish, Joseph N. Grima, Daphne Attard

引用次数: 4