Materials Science eJournal最新文献_第9页

Out-Of-Plane Buckling of Steel I-Section Circular Arches 工字型钢圆拱的面外屈曲

Materials Science eJournal Pub Date : 2019-09-04 DOI: 10.2139/ssrn.3447736

Fathima B Nazar, Rajesh

引用次数: 0

Nanotwinned Cu and In-Situ Fe 2p Reinforced Bulk Cu-Fe Immiscible Alloy by Selective Laser Melting: Enhanced Strength and Plasticity 选择性激光熔化纳米孪晶Cu和原位fe2p增强块状Cu-Fe不混相合金:增强强度和塑性

Materials Science eJournal Pub Date : 2019-07-27 DOI: 10.2139/ssrn.3427483

Shengfeng Zhou, Shuzhen Zhao, Jianbo Jin, Lai‐Chang Zhang

引用次数: 0

Ultrafast Lithium Diffusion in Bilayer Buckled Graphene: A Comparative Study of Li and Na 锂在双层屈曲石墨烯中的超快扩散:Li和Na的比较研究

Materials Science eJournal Pub Date : 2019-07-18 DOI: 10.2139/ssrn.3467756

R. Yamaletdinov, Y. Pershin

引用次数: 5

Presentation of the Main Types of High Tensile Steels Used in the Automotive Industry and Their Main Applications 介绍汽车工业用高强度钢的主要类型及其主要用途

Materials Science eJournal Pub Date : 2019-07-05 DOI: 10.2139/ssrn.3415208

José L. Meseguer-Valdenebro, A. Portolés

引用次数: 0

Helical Dislocations: Observation of Vacancy Defect Bias of Screw Dislocations in Neutron Irradiated Fe-9Cr 螺旋位错:中子辐照Fe-9Cr中螺旋位错空位缺陷偏置的观察

Materials Science eJournal Pub Date : 2019-06-19 DOI: 10.2139/ssrn.3406920

J. Haley, F. Liu, E. Tarleton, A. Cocks, G. Odette, S. Lozano-Perez, S. Roberts

{"title":"Helical Dislocations: Observation of Vacancy Defect Bias of Screw Dislocations in Neutron Irradiated Fe-9Cr","authors":"J. Haley, F. Liu, E. Tarleton, A. Cocks, G. Odette, S. Lozano-Perez, S. Roberts","doi":"10.2139/ssrn.3406920","DOIUrl":"https://doi.org/10.2139/ssrn.3406920","url":null,"abstract":"We have analysed the microstructure of a model alloy of Fe9Cr irradiated with neutrons to a dose of 1.6 dpa at 325<sup>o</sup>C. Helical dislocations comprise a major part of the damage; these formed from the interaction of pre-existing screw dislocations with irradiation-induced defects. We have investigated the process behind how these helices form, and how they cause local clustering of dislocation loops. Specifically, we have shown experimentally that the interaction of vacancy defects with pre-existing screw dislocations causes the formation of mixed screw-edge helical dislocations. Interstitials and vacancies were generated in equal numbers, which shows that the screw dislocations must have acted as vacancy-biased sinks.Helical dislocations in general were analysed from a theoretical perspective, and three Dimensional Discrete Dislocation Dynamics (3D-DDD) was used to develop a model for the formation and growth of a vacancy-fed helical dislocation. Since the helical dislocations cause the removal of vacancies from the local microstructure, this leaves a higher supersaturation of interstitials close to the dislocations. We argue that this supersaturation is responsible for enhanced interstitial loop coarsening, leading to a higher proportion of visible interstitial clusters in the vicinity of helical dislocations. These findings offer a new perspective on how dislocations affect the spatial homogeneity of radiation damage.","PeriodicalId":18341,"journal":{"name":"Materials Science eJournal","volume":"6 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78330583","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

Synthesis and Mechanical Characterization of Synthetic Bio Hybrid FRP Composites 合成生物杂化玻璃钢复合材料的合成及力学性能研究

Materials Science eJournal Pub Date : 2019-05-17 DOI: 10.2139/ssrn.3511347

Thyagaraj N. R., Aruna B. N., D. T. Gowda, Dr. P. Rukumangadha, D. R.

{"title":"Synthesis and Mechanical Characterization of Synthetic Bio Hybrid FRP Composites","authors":"Thyagaraj N. R., Aruna B. N., D. T. Gowda, Dr. P. Rukumangadha, D. R.","doi":"10.2139/ssrn.3511347","DOIUrl":"https://doi.org/10.2139/ssrn.3511347","url":null,"abstract":"The advantageous characteristics of FRPs over any other caste of composites have provoked many researchers to take up the research on FRPs with different categories of reinforcement which acts majorly as the load carrying and distributing agents. Even though the methodology for synthesis of composites have wide spectrum of choices, it is of greater importance to conclude which method is best suited particularly. Here in this work an attempt is being made to synthesize hybrid FRPs with natural fibers as the reinforcements and the composite generated will be environmental friendly. Always the mechanical characterization of any composite manufactured plays a major role as it leads to deciding on the application area where they can be used without failure. Hence, once the hybrid FRPs are fabricated, the performance analysis on the basis of mechanical characteristics is performed. The comparison of composites with natural fibers as reinforcements along with the hybrid composites is made to obtain the conclusion of better composite. The results obtained reveals that the hybrid composites have better mechanical characteristics as compared to that of jute and glass fiber reinforced composites.","PeriodicalId":18341,"journal":{"name":"Materials Science eJournal","volume":"18 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82777407","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

Thermochemical and Thermomechanical study on Composite Coatings (Al 2O 3+ZrO 2•5CaO) 复合涂层(al2o3 +ZrO 2•5CaO)的热化学和热力学研究

Materials Science eJournal Pub Date : 2019-05-17 DOI: 10.2139/ssrn.3511933

Abhinav, N. Murthy, Avinash J Nair

引用次数: 2

Shape Optimization of Blended-Wing-Body Configuration- An Experimental Approach 翼身混合结构的形状优化——一种实验方法

Materials Science eJournal Pub Date : 2019-05-17 DOI: 10.2139/ssrn.3507300

N. P, Dr. A. Arokkiaswamy, Anthony Alen A

{"title":"Shape Optimization of Blended-Wing-Body Configuration- An Experimental Approach","authors":"N. P, Dr. A. Arokkiaswamy, Anthony Alen A","doi":"10.2139/ssrn.3507300","DOIUrl":"https://doi.org/10.2139/ssrn.3507300","url":null,"abstract":"In the recent years alternative aircraft configurations, such as Blended – Wing- Body(BWB) aircraft, are being studied and researched with the intention to develop more effectual aircraft configurations, in particular for very large transport that are more efficient and environmental friendly. In addition to the removal of the tail for this specific kind of aircraft and the substantial decline in equivalent weight, drag force, and radar cross-section, the accessible space for mounting equipment inside the wing and the operational range have also been augmented. Regardless of all these stated advantages, instability is the negative outcome of removing the tail. Revising this imperfection requires designing a combination of control surfaces and reflexed wing sections and using complex computer control systems. Hence, the aerodynamic shape optimization of BWBs, along with the need to meet the design necessities, has encouraged numerous investigators to overwhelm its challenges. In this project an experimental approach was adopted to optimize the shape of a basic design of a BWB using an experimental approach. The flow simulation using wind tunnel was carried out for a basic model of BWB. Then the aerodynamic efficiency of the basic design was compared with a conventional aircraft B747 using the same experimental conditions. The three models such as the basic BWB, B747 and the 787 were compared in terms of their (CL)max, (CD)min and (L/D)max values. The results were presented with the BWB with 45% efficient shape when the above-mentioned parameters are compared.","PeriodicalId":18341,"journal":{"name":"Materials Science eJournal","volume":"123 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83512649","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

The Effectiveness of Vegetation in Reducing Building Energy Demand 植被在降低建筑能源需求中的有效性

Materials Science eJournal Pub Date : 2019-05-13 DOI: 10.2139/ssrn.3384323

Allie Molinaro

引用次数: 0

Low Defect Planar Graphene Exfoliation by Sonication in Polypropylene Carbonate and 5 Sec Microwaving 低缺陷平面石墨烯在碳酸丙烯酯和5秒微波中的超声剥落

Materials Science eJournal Pub Date : 2019-05-11 DOI: 10.1149/ma2020-02463737mtgabs

O. Dada

{"title":"Low Defect Planar Graphene Exfoliation by Sonication in Polypropylene Carbonate and 5 Sec Microwaving","authors":"O. Dada","doi":"10.1149/ma2020-02463737mtgabs","DOIUrl":"https://doi.org/10.1149/ma2020-02463737mtgabs","url":null,"abstract":"This is an exceptional process on low cost, low defect and high-quality graphene which is produced by sonication in PPC and microwaving for just 5sec. Low energy arc-discharging process expands electrolytic graphite rods into hierarchical-like 3D-graphene retaining the basal plane carbon crystalline order and chemical purity [1-2]. Sonication in Polypropylene Carbonate causes non-covalent PPC-π bonding at graphene basal plane, aligning the graphene sheets in directions that allows efficient transmission of cavitation pressures and exfoliation; while microwave treatment for 5s separates any layered graphene, utilizing thermally induced lattice vibrations without changes on surface properties. Produced graphene (XRD 2θ = 26 ⁰C) has low defect (0.05 < ID/IG < 0.2), retainment of chemical purity (0~2.5% O2 content), with optimized effective graphene sizes (ranging from 350nm to 35 um), for diverse applications, dispersibility in diverse solvent, conformability to flat semi-transparent surfaces; storable in concentrated slurry (>50 mg mL−1). Planar graphene is suitable as 2D electronic materials applications [3], composites [4] and energy materials applications [5-10].","PeriodicalId":18341,"journal":{"name":"Materials Science eJournal","volume":"4 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-05-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86787957","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