Key Engineering Materials最新文献

Evaluation of the Inter-Building Effect on Energy Saving Potential of Radiative Cooling Materials 评估建筑间效应对辐射冷却材料节能潜力的影响

Key Engineering Materials Pub Date : 2024-07-10 DOI: 10.4028/p-x163qd

Qi Li, Jia Yu Chen, Xiaowei Luo

引用次数: 0

The Use of Plastic Bottle Fibers in the Geotechnical Improvement of Tropical Soils from the Municipality of Viçosa - Brazil 使用塑料瓶纤维改善巴西维索萨市的热带土壤土质

Key Engineering Materials Pub Date : 2024-05-14 DOI: 10.4028/p-qk3eoc

Daniely Camargos Lucarelli, H. Pitanga, Maria Esther Soares Marques, Taciano Oliveira da Silva, Darlan Miranda Nunes

{"title":"The Use of Plastic Bottle Fibers in the Geotechnical Improvement of Tropical Soils from the Municipality of Viçosa - Brazil","authors":"Daniely Camargos Lucarelli, H. Pitanga, Maria Esther Soares Marques, Taciano Oliveira da Silva, Darlan Miranda Nunes","doi":"10.4028/p-qk3eoc","DOIUrl":"https://doi.org/10.4028/p-qk3eoc","url":null,"abstract":"Motivated by the environmental issues generated by the accumulation of waste from discarded plastic bottles and recognizing the utility of plastic properties in engineering, this research aimed to evaluate the application of plastic bottle fibers in the geotechnical improvement of tropical soils. In this context, the influence of quantity, roughness, and width of plastic bottle fibers on the shear strength parameters of soil- fiber mixtures, of two tropical residual soils, was analyzed. The fibers used in this study are made of Polyethylene Terephthalate (PET), generated from soft drink bottles, and added to the soil in different widths, textures, and contents. Results of the direct shear test showed higher shear strength for all soil-fiber systems compared to fiber-free mixtures. Additionally, the findings indicated that the systems with rough fibers presented better performances for clayey soil, whereas those with smooth fibers obtained better behavior for sandy soil. The cohesion results highlighted the better performance of mixtures with 0.5% fibers when compared to mixtures with 1% fibers. The enhancement of mechanical properties obtained in the studied soil-fiber systems demonstrates the potential application of these composites in geotechnical works.","PeriodicalId":507685,"journal":{"name":"Key Engineering Materials","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140979678","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

Mathematical Model of Vibration-Centrifugal Processing of Parts Using Loose Abrasive 使用松散磨料对零件进行振动-离心加工的数学模型

Key Engineering Materials Pub Date : 2024-05-14 DOI: 10.4028/p-whu4hr

Oleg Lyashuk, Mykola Mytnyk, V. Aulin, Ihor Lutsiv, Ihor Tkachenko, Yu. Galan, Olga Perenchuk, O. Kondratiuk

{"title":"Mathematical Model of Vibration-Centrifugal Processing of Parts Using Loose Abrasive","authors":"Oleg Lyashuk, Mykola Mytnyk, V. Aulin, Ihor Lutsiv, Ihor Tkachenko, Yu. Galan, Olga Perenchuk, O. Kondratiuk","doi":"10.4028/p-whu4hr","DOIUrl":"https://doi.org/10.4028/p-whu4hr","url":null,"abstract":"The article presents some new theoretical and experimental solution of a scientific and applied problem of technological support for vibratory centrifugal processing of complex-profiled parts in a bulk abrasive environment. This solution aims to increase productivity while ensuring the desired quality of the processed surfaces. The authors have developed a mathematical model that describes the action of abrasive particles on the surface of the parts, taking into account the parameters of the granular abrasive medium based on Voigt’s law. This allows the description of dynamic processes in the processing environment for a wide range of material types. The natural frequencies of oscillations of the processed medium layer have been determined, which depend on the amplitude of its vibrations for different densities of soft and hard materials of the processed medium and the medium with linear-elastic properties. The methodology includes the use of test equipment to conduct experimental research on the process, which involves determining changes in specific metal removal rates and surface roughness using the frequency converter Altivar 71 with the PowerSuite v.2.5.0 software.","PeriodicalId":507685,"journal":{"name":"Key Engineering Materials","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140981910","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

Microstructural Characterization, Mechanical Performance, and Anti-Corrosive Response of Zinc Multifaceted Coating on Mild Steel 低碳钢多面镀锌层的微观结构表征、机械性能和抗腐蚀性能

Key Engineering Materials Pub Date : 2024-05-14 DOI: 10.4028/p-s6s0ms

Alima. O Derek, O. Fayomi, Joshua O. Atiba

{"title":"Microstructural Characterization, Mechanical Performance, and Anti-Corrosive Response of Zinc Multifaceted Coating on Mild Steel","authors":"Alima. O Derek, O. Fayomi, Joshua O. Atiba","doi":"10.4028/p-s6s0ms","DOIUrl":"https://doi.org/10.4028/p-s6s0ms","url":null,"abstract":"Zinc has attracted significant attention in research due to its cost-effective use as an electrodeposited material, effectively protecting various types of steel from corrosion and wear. However, despite its advantages, zinc has limitations in fully guarding steel against corrosion. Recent studies propose that blending zinc with other metals during the coating process can proficiently shield mild steel from deterioration. The motivation for this study stems from recognizing the restrictions of zinc electrodeposition and the limited exploration of zinc multi-facet composite coatings for mild steel. In this study, the electrodeposition technique was employed to apply a coating to mild steel using zinc and nanoparticles of calcium oxide (CaO) and manganese oxide (MnO2). The coating bath's chemical composition included mass variations of 0-12 g/L for CaO and MnO2, along with 10 g/L each of boric acid, thiourea, and Na2SO4, and 15 g/L of K2SO4 and ZnSO4. The coating process occurred over a twenty-minute period, with a pH of 4.8, voltage set at 3.2V, current density at 1 A/cm2, temperature at 47°C, and stirring rate at 200 rpm. Results obtained from the coated mild steel demonstrated that Zn-6CaO-6MnO2 exhibited the greatest coating thickness at 0.2308 mm, and it showcased impressive corrosion resistance at 2.0618 mm/year. The Zn-CaO-MnO2 coating displayed a substantial deposit of crystallites in its microstructure, assisted by the presence of manganese, contributing to a smoother surface texture.","PeriodicalId":507685,"journal":{"name":"Key Engineering Materials","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140978332","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

Flexural Performance of Repaired RC Beams with Grouting and GFRP Sheet Equipped with Anchors 使用灌浆和装有锚栓的玻璃纤维增强塑料板修复的钢筋混凝土梁的挠曲性能

Key Engineering Materials Pub Date : 2024-05-14 DOI: 10.4028/p-6gfact

Muhammad Ali, R. Djamaluddin, R. Irmawaty, F. Fakhruddin, A. A. Sila

{"title":"Flexural Performance of Repaired RC Beams with Grouting and GFRP Sheet Equipped with Anchors","authors":"Muhammad Ali, R. Djamaluddin, R. Irmawaty, F. Fakhruddin, A. A. Sila","doi":"10.4028/p-6gfact","DOIUrl":"https://doi.org/10.4028/p-6gfact","url":null,"abstract":"In this study, an experiment was performed on flexural behavior of RC beam that experienced spalling due to corrosion. The spalled concrete was repaired using grouted mortar, while the lost reinforcement area was replaced with Glass Fiber Reinforced Polymer (GFRP) sheets. The effectiveness of these repairs relied heavily on the bond between the existing and new concrete, ensuring no delamination occurred under maximum load. To enhance this bond, connectors or dyna-bolt anchors were incorporated into the joint area. Eight RC beam were prepared, each with a cross-section of 150 mm x 200 mm and length of 3300 mm, consisting of 1) two existing beams (BE), 2) two beams repaired with grouting and GFRP sheet (BGS), 3) two beams with grouting, GFRP sheet, and the addition of 4 anchors (BGS-DN4), and 4) two beams with grouting, GFRP sheet, and the addition of 8 anchors (BGS-DN8). The repaired area was 2700 mm long and 50 mm thick, and then flexural testing using four-point loads was conducted on all specimens. The results showed that RC beam repaired with mortar grouting and GFRP sheets, along with the inclusion of 4 dyna-bolt anchors in the connection area (BGS-DN4), could increase the maximum load by 61% compared to BE. This repair method improved the bond between the existing concrete and the repair material, effectively preventing delamination.","PeriodicalId":507685,"journal":{"name":"Key Engineering Materials","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140982151","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

Role of Nanotitania Ceramic Particulate Filler on Mechanical and Wear Behaviour of Dental Composite 纳米二氧化钛陶瓷微粒填料对牙科复合材料机械和磨损行为的影响

Key Engineering Materials Pub Date : 2024-05-14 DOI: 10.4028/p-cjt5o2

Shiv Ranjan Kumar

{"title":"Role of Nanotitania Ceramic Particulate Filler on Mechanical and Wear Behaviour of Dental Composite","authors":"Shiv Ranjan Kumar","doi":"10.4028/p-cjt5o2","DOIUrl":"https://doi.org/10.4028/p-cjt5o2","url":null,"abstract":"Nanotitania is a well-acceptable material in biomedical applications due to its excellent biocompatibility. However, its other performances in terms of physical properties, mechanical properties and specific wear rate have been the keen interest of researchers. The study aims to modify dental composite formulation by adding nanotitania filler in different mass fractions and study to investigate its influence on physical and mechanical properties. A conventional monomer matrix consisting of Bisphenol A-Glycidyl methacrylate (BisGMA), Urethane dimethacrylate (UDMA), Triethylene glycol dimethacrylate (TEGDMA), Camphor Quinone (CO), Ethyl-4-dimethylaminobenzoate (EDMAB) was first added and modified with varying nanotitania filler fractions (0,0.5,1,1.5 wt. %). The performance of newly formulated composites was investigated in four major parameters like apparent porosity, hardness, compressive strength and specific wear rate. All tests are performed as per ISO4049 standard which are requirements for fabrication, characterization, direct/indirect restoration of dental composite, inlays, onlays, veneers, crowns and bridges. Specific wear rate was estimated using pin on disk tribometer under constant load of 20N. Due to its extremely hard and brittle nature, the micro-hardness and compressive strength of resin composite on adding 0.5 wt.-% of nanotitania filler fraction (DC0.5TiO2) were increased by 68% and 16% respectively. Using a pin on disc tribometer, a wear assessment has been performed and it was found that under constant wear parameters and distilled water environmental conditions, the specific wear rate was decreased by 26 % on adding 0.5 wt.-% mass fraction of nanotitania. Nanotitania indicated excellent performance based on mechanical and wear properties and hence, it can be suggested to use nanotitania as a novel filler of dental composite for the replacement of other non-biocompatible ceramic filler.","PeriodicalId":507685,"journal":{"name":"Key Engineering Materials","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140981672","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

Effect of Ni-Doping on Seebeck Coefficient of LaCoO3 System 掺镍对 LaCoO3 系统塞贝克系数的影响

Key Engineering Materials Pub Date : 2024-05-14 DOI: 10.4028/p-95uobe

Diego Mejía Echavarría, Viancy Isaza Zapata, Diego Muñoz, Hernando Correa, Ricardo Pineda Diego, Jorge Luis Izquierdo

{"title":"Effect of Ni-Doping on Seebeck Coefficient of LaCoO3 System","authors":"Diego Mejía Echavarría, Viancy Isaza Zapata, Diego Muñoz, Hernando Correa, Ricardo Pineda Diego, Jorge Luis Izquierdo","doi":"10.4028/p-95uobe","DOIUrl":"https://doi.org/10.4028/p-95uobe","url":null,"abstract":"The aim of this study is discussing the results achieved on undoped and Ni-doped bulk LaCoO3 samples synthesized by solid-state reaction. The crystal structures of the samples were analyzed by x – ray diffraction (XRD) and Rietveld refinement of the XRD patterns was used to test the quality of the samples, the results of this procedure confirmed a single phase of LaCo1-xNixO3 for (x=0 and 0.05) with rhombohedral crystal structure (space group :). The main interest in this class of materials is the possibility of improving the values of Seebeck coefficient and electrical resistivity through chemical doping. The Seebeck coefficient and electrical resistivity were investigated from room temperature (RT) to 450 K, near RT the LaCoO3 system showed a large negative Seebeck coefficient, but it changed to positive value with increasing temperature while the LaCo0.95Ni0.05O3 composition showed a positive Seebeck coefficient throughout all the temperature range. Hence, within this study the Ni substitution led to decrease the electrical resistivity of the samples to one order of magnitude as a result of the partial substitution of Co3+ in LaCoO3 by Ni2+. LaCoO3 was chosen for this thermoelectric test because cobalt oxides have extensive applications.","PeriodicalId":507685,"journal":{"name":"Key Engineering Materials","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140980580","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

Optimization of the Car Body Elements’ Stamping Process Based on the Strain Analysis 基于应变分析的车身部件冲压工艺优化

Key Engineering Materials Pub Date : 2024-05-14 DOI: 10.4028/p-f2inai

Artur Rękas, Tomasz Kaczmarek, Marek Radke, Marcin Kneć

引用次数: 0

Modelling the Charpy Impact Ductile-Brittle Transition of a Ship Plate Steel with CAFE Modelling 用 CAFE 建模法模拟船板钢的夏比冲击韧性-脆性转变过程

Key Engineering Materials Pub Date : 2024-05-14 DOI: 10.4028/p-mxuix7

R. Cuamatzi-Meléndez, Fernando Juárez-López

{"title":"Modelling the Charpy Impact Ductile-Brittle Transition of a Ship Plate Steel with CAFE Modelling","authors":"R. Cuamatzi-Meléndez, Fernando Juárez-López","doi":"10.4028/p-mxuix7","DOIUrl":"https://doi.org/10.4028/p-mxuix7","url":null,"abstract":"In the present work, a cellular automata finite element model (CAFE) was developed to model the ductile-brittle transition of a Grade A ship plate steel. Therefore, ductile and brittle cellular automata (CA) arrays of cells were created in the model to integrate material data at microstructural level, along with the ductile and brittle fracture processes. Microstructural data was analysed with Weibull distributions and incorporated in CAFE model using random number generators, along with ductile and brittle fracture parameters. Ductile fracture was modelled with Rousselier damage model; hence damage model parameters were calibrated with experimental data. Brittle fracture was modelled with Beremin model, and four different cleavage particles, found in a Grade A ship plate steel, were incorporated in CAFE model in order to model a competition of particles nucleating microcracks of critical size in the damage regions of Impact Charpy tests and four-point double-notch bend tests performed at low temperature. The mechanical properties the plate steel was measured in the transition region and incorporated in CAFE model, along with ductile-brittle transition rules. The present CAFE model was able to simulate distributions of microcracks in the notch region of four-point double-notch bend models (in the transition region), which correlated with experimental data. CAFE model was also able to simulate microvoids in the notch region of Charpy specimens along with the load-displacement Charpy curve for room test temperature, with very good agreement with experimental data. Once CAFE model was validated at micro and structural level, it was applied to model the typical scatter of impact Charpy energy values in the transition region of Grade A ship plate steel with good agreement with the measured ductile-brittle transition curved of the plate steel. Keywords: cellular automata, finite element modelling, ductile-brittle transition, damage modelling.","PeriodicalId":507685,"journal":{"name":"Key Engineering Materials","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140980413","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

Development of Ni-Mn-Ga Enabled Micropumps for Hybrid Microdevices in Microelectromechanical Systems 开发用于微机电系统中混合微型器件的镍锰镓微泵

Key Engineering Materials Pub Date : 2024-05-14 DOI: 10.4028/p-5tcoml

Hao Hu, Huihuang Jiang, Dong Hui Guo, Kari Ullakko

{"title":"Development of Ni-Mn-Ga Enabled Micropumps for Hybrid Microdevices in Microelectromechanical Systems","authors":"Hao Hu, Huihuang Jiang, Dong Hui Guo, Kari Ullakko","doi":"10.4028/p-5tcoml","DOIUrl":"https://doi.org/10.4028/p-5tcoml","url":null,"abstract":"This study selects a single crystalline Ni-Mn-Ga alloy by its exceptional actuator attributes, high actuation speed, precise position control, rapid response to external magnetic fields, and extended operational lifespan. Researchers venture into uncharted territory, aiming to harness the potential of Ni-Mn-Ga alloy to revolutionize micropump performance and refine fluid manipulation within miniature devices. The methodology at the heart of this endeavor involves the seamless integration of this specialized alloy with microdevice technology, giving rise to a set of unique pump components that substantially boost pump efficiency. Crucially, Ni-Mn-Ga is the chosen material for the active part of the micropump. At the same time, MEMS fabrication handles the passive elements, all facilitated by the 0.18 µm semiconductor technology and Sivalco TCAD simulation software. Computational simulations validate the alloy's suitability, impressively achieving an accumulated flow volume of 0.15 x 10e-4 µL in 10 microseconds. Beyond its scientific significance, this research bridges MEMS technology and magnetic-enabled smart materials, showcasing the remarkable capabilities of Ni-Mn-Ga alloy in significantly enhancing micropump performance. These innovative solutions promise to open doors to groundbreaking applications in microfluidic systems across many scientific and industrial domains.","PeriodicalId":507685,"journal":{"name":"Key Engineering Materials","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140979042","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