Advances in Materials Research-An International Journal最新文献_第9页

Exposure to elevated temperatures and cooled under different regimes-a study on polypropylene concrete 暴露在高温下，在不同的环境下冷却——聚丙烯混凝土的研究

IF 2.2

Advances in Materials Research-An International Journal Pub Date : 2016-03-25 DOI: 10.12989/AMR.2016.5.1.021

S. Yaragal, S. Ramanjaneyulu

{"title":"Exposure to elevated temperatures and cooled under different regimes-a study on polypropylene concrete","authors":"S. Yaragal, S. Ramanjaneyulu","doi":"10.12989/AMR.2016.5.1.021","DOIUrl":"https://doi.org/10.12989/AMR.2016.5.1.021","url":null,"abstract":"Fire is one of the most destructive powers to which a building structure can be subjected, often exposing concrete elements to elevated temperatures. The relative properties of concrete after such an exposure are of significant importance in terms of the serviceability of buildings. Unraveling the heating history of concrete and different cooling regimes is important for forensic research or to determine whether a fire-exposed concrete structure and its components are still structurally sound or not. Assessment of fire-damaged concrete structures usually starts with visual observation of colour change, cracking and spalling. Thus, it is important to know the effect of elevated temperatures on strength retention properties of concrete. This study reports the effect of elevated temperature on the mechanical properties of the concrete specimen with polypropylene fibres and cooled differently under various regimes. In the heating cycle, the specimen were subjected to elevated temperatures ranging from 200°C to 800°C, in steps of 200°C with a retention period of 1 hour. Then they were cooled to room temperature differently. The cooling regimes studied include, furnace cooling, air cooling and sudden cooling. After exposure to elevated temperatures and cooled differently, the weight loss, residual compressive and split tensile strengths retention characteristics were studied. Test results indicated that weight and both compressive and tensile strengths significantly reduce, with an increase in temperature and are strongly dependent on cooling regimes adopted.","PeriodicalId":46242,"journal":{"name":"Advances in Materials Research-An International Journal","volume":null,"pages":null},"PeriodicalIF":2.2,"publicationDate":"2016-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66387858","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: 14

Bending analysis of an imperfect FGM plates under hygro-thermo-mechanical loading with analytical validation 不完美FGM板在湿热机械载荷下的弯曲分析及分析验证

IF 2.2

Advances in Materials Research-An International Journal Pub Date : 2016-03-25 DOI: 10.12989/AMR.2016.5.1.035

T. H. Daouadji, B. Adim, Rabia Benferhat

引用次数: 26

Theoretical analysis of composite beams under uniformly distributed load 均布荷载作用下组合梁的理论分析

IF 2.2

Advances in Materials Research-An International Journal Pub Date : 2016-03-25 DOI: 10.12989/AMR.2016.5.1.001

T. H. Daouadji, B. Adim

引用次数: 13

The effects of Mg 2 Si (p) on microstructure and mechanical properties of AA332 composite mg2si (p)对AA332复合材料显微组织和力学性能的影响

IF 2.2

Advances in Materials Research-An International Journal Pub Date : 2016-03-25 DOI: 10.12989/AMR.2016.5.1.055

Fizam Zainon, K. R. Ahmad, R. Daud

{"title":"The effects of Mg 2 Si (p) on microstructure and mechanical properties of AA332 composite","authors":"Fizam Zainon, K. R. Ahmad, R. Daud","doi":"10.12989/AMR.2016.5.1.055","DOIUrl":"https://doi.org/10.12989/AMR.2016.5.1.055","url":null,"abstract":"This paper describes a study on the effects of Mg2Si(p) addition on the microstructure, porosity, and mechanical properties namely hardness and tensile properties of AA332 composite. Each composite respectively contains 5, 10, 15, and 20 wt% reinforcement particles developed by a stir-casting. The molten composite was stirred at 600 rpm and melted at 900°C ± 5°C. The Mg2Si particles were wrapped in an aluminum foil to keep them from burning when melting. The findings revealed that the microstructure of Mg2Si(p)/AA332 consists of α-Al, binary eutectic (Al+Mg2Si), Mg2Si particles, and intermetallic compound. The intermetallic compound was identified as Fe-rich and Cu-rich, formed as polygonal or blocky, Chinese script, needle-like, and polyhendrons or “skeleton like”. The porosity of Mg2Si(p)/AA332 composite increased from 8-10% and the density decreased from 9-12% from as-cast. Mechanical properties such as hardness increased for over 42% from as-cast and the highest UTS, elongation, and maximum Q.I were achieved in the sample of 10% Mg2Si. The study concludes that combined with AA332, the amount of 10 wt% of Mg2Si is a suitable reinforcement quantity with the combination of AA332.","PeriodicalId":46242,"journal":{"name":"Advances in Materials Research-An International Journal","volume":null,"pages":null},"PeriodicalIF":2.2,"publicationDate":"2016-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66387911","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: 13

Properties of polypropylene fibers using the green chemical orotic acid as nucleating agent 用绿色化学物山楂酸作成核剂的聚丙烯纤维的性能

IF 2.2

Advances in Materials Research-An International Journal Pub Date : 2015-12-25 DOI: 10.12989/AMR.2015.4.4.207

R. Vogel, H. Brünig, L. Häussler

引用次数: 1

Roughness and micro pit defects on surface of SUS 430 stainless steel strip in cold rolling process sus430不锈钢带钢冷轧过程中表面粗糙度及微坑缺陷

IF 2.2

Advances in Materials Research-An International Journal Pub Date : 2015-12-25 DOI: 10.12989/AMR.2015.4.4.215

Changsheng Li, T. Zhu, Bo Fu, You-yuan Li

{"title":"Roughness and micro pit defects on surface of SUS 430 stainless steel strip in cold rolling process","authors":"Changsheng Li, T. Zhu, Bo Fu, You-yuan Li","doi":"10.12989/AMR.2015.4.4.215","DOIUrl":"https://doi.org/10.12989/AMR.2015.4.4.215","url":null,"abstract":". Experiment on roughness and micro pit defects of SUS 430 ferrite stainless steel was investigated in laboratory. The relation between roughness and glossiness with reduction in height, roll surface roughness, emulsion parameters was analyzed. The surface morphology of micro pit defects was observed by SEM, and the effects of micro pit defects on rolling reduction, roll surface roughness, emulsion parameters, lubrication oil in deformation zone and work roll diameter were discussed. With the increasing of reduction ratio strip surface roughness Ra(s), Rp(s) and Rv(s) were decreasing along rolling and width direction, the drop value in rolling direction was faster than that in width direction. The roughness and glossiness were obtained under emulsion concentration 3% and 6%, temperature 55°C and 63°C, roll surface roughness Ra( r )=0.5 μ m, Ra( r )=0.7 μ m and Ra( r )=1.0 μ m. The glossiness was declined rapidly when the micro defects ratio was above 23%. With the pass number increasing, the micro pit defects were reduced, uneven peak was decreased and gently along rolling direction. The micro pit defects were increased with the roll surface roughness increase. The defects ratio was declined with larger gradient at pass number 1 to 3, but gentle slope at pass number 4 to 5. When work roll diameter was small, bite angle was increasing, lubrication oil in micro pit of deformation zone was decreased, micro defects were decreased, and glossiness value on the surface of strip was increased. Roughness and micro pit defects on surface of SUS 430 stainless steel strip….","PeriodicalId":46242,"journal":{"name":"Advances in Materials Research-An International Journal","volume":null,"pages":null},"PeriodicalIF":2.2,"publicationDate":"2015-12-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66388127","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

Characterizations of nano-zinc doped hydroxyapatite to use as bone tissue engineering 纳米锌掺杂羟基磷灰石用于骨组织工程的表征

IF 2.2

Advances in Materials Research-An International Journal Pub Date : 2015-12-25 DOI: 10.12989/AMR.2015.4.4.193

Basma E. Abdel-Ghany, Bothaina M Abdel-Hady, A. M. El-kady, Hanan H. Beheiry, O. W. Guirguis

{"title":"Characterizations of nano-zinc doped hydroxyapatite to use as bone tissue engineering","authors":"Basma E. Abdel-Ghany, Bothaina M Abdel-Hady, A. M. El-kady, Hanan H. Beheiry, O. W. Guirguis","doi":"10.12989/AMR.2015.4.4.193","DOIUrl":"https://doi.org/10.12989/AMR.2015.4.4.193","url":null,"abstract":"Contamination by bacterial strands is a major problem after bone replacement surgeries, so there is a great need to develop low cost biocompatible antibacterial bioactive scaffolds to be used in bone tissue engineering. For this purpose, nano-zinc doped hydroxyapatite with different zinc-concentrations (5, 10 and 15 mol%) was successfully prepared by the wet chemical precipitation method. The prepared powders were used to form porous scaffolds containing biodegradable \u0000Ca-cross-linked alginate (5%) in order to enhance the properties of alginate scaffolds. The scaffolds \u0000were prepared using the freeze-gelation method. The prepared powders were tested by X-ray diffraction; transmission electron microscope and Fourier transform infrared analyses, while the prepared scaffolds were investigated by Fourier transform infrared analyses, thermogravimetric analyses and measurement of the antibacterial properties. Best results were obtained from scaffold containing 15% mol zinc-doped hydroxyapatite powders and 5% alginate concentration with ratio of \u000070:30.","PeriodicalId":46242,"journal":{"name":"Advances in Materials Research-An International Journal","volume":null,"pages":null},"PeriodicalIF":2.2,"publicationDate":"2015-12-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66387614","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

Strategic coating of NdFeB magnets with Dy to improve the coercivity of permanent magnets 在钕铁硼磁体上涂上Dy以提高永磁体的矫顽力

IF 2.2

Advances in Materials Research-An International Journal Pub Date : 2015-12-25 DOI: 10.12989/AMR.2015.4.4.227

Huseyin Ucar, D. Parker, I. Nlebedim, R. McCallum, S. McCall, M. Paranthaman

{"title":"Strategic coating of NdFeB magnets with Dy to improve the coercivity of permanent magnets","authors":"Huseyin Ucar, D. Parker, I. Nlebedim, R. McCallum, S. McCall, M. Paranthaman","doi":"10.12989/AMR.2015.4.4.227","DOIUrl":"https://doi.org/10.12989/AMR.2015.4.4.227","url":null,"abstract":"Here, we present a method, supported by theoretical analysis, for optimizing the usage of the critical rare earth element dysprosium in Nd2Fe14B (NdFeB)-based permanent magnets. In this method, we use Dy selectively in locations such as magnet edges and faces, where demagnetization factors are most significant, rather than uniformly throughout the bulk sample. A 200 nm thick Dy film was sputtered onto commercial N-38, NdFeB magnets with a thickness of 3 mm and post-annealed at temperatures from 600 - 700 C. Magnets displayed enhanced coercivities after post-annealing. Furthermore, our experimental results indicate as large as a 5 percent increase in the energy product of NdFeB magnets, achieved for a total Dy weight percentage of 0.06 percent, much less than that used in commercial grade Dy-NdFeB magnets. Finally, by assuming all Dy diffused into NdFeB magnets, the improvement in energy product corresponds to a saving of over 1% Dy (critical element). Magnets manufactured using this technique will therefore be higher performing and significantly less expensive than those made presently.","PeriodicalId":46242,"journal":{"name":"Advances in Materials Research-An International Journal","volume":null,"pages":null},"PeriodicalIF":2.2,"publicationDate":"2015-12-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66388261","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: 7

Alkali activated ceramic waste with or without two different calcium sources 含或不含两种不同钙源的碱活性陶瓷废料

IF 2.2

Advances in Materials Research-An International Journal Pub Date : 2015-09-25 DOI: 10.12989/AMR.2015.4.3.133

Sayieda R. Zedan, M. Mohamed, D. Ahmed, Aya H. Mohammed

{"title":"Alkali activated ceramic waste with or without two different calcium sources","authors":"Sayieda R. Zedan, M. Mohamed, D. Ahmed, Aya H. Mohammed","doi":"10.12989/AMR.2015.4.3.133","DOIUrl":"https://doi.org/10.12989/AMR.2015.4.3.133","url":null,"abstract":". The aim of this investigation is to prepare geopolymer resin by alkali activation of ceramic waste (AACW) with different sodium hydroxide (NaOH) and liquid sodium silicate (LSS) concentrations. In order to prepare geopolymer cement, AACW was replaced by 10 and 30 % by weight (wt.,) of concrete waste (CoW) as well as 10 and 30 wt., % ground granulated blast-furnace slag (GGBFS). The results showed that, the compressive strength of AACW increases with the increase of activator content up to 15:15 wt., % NaOH: LSS. All AACW hardened specimens activated by 3:3 (MC6), 6:6 (MC12), 12:12 (MC24) and 15:15 wt., % (MC30) NaOH: LSS destroyed when cured in water for 24h. The MC18 mix showed higher resistivity to water curing. The results also showed that, the replacement of AACW containing 9:9 wt., % NaOH: LSS (MC18) by 10 (MCCo10) and 30 (MCCo30) wt., % CoW decreased the compressive strength at all ages of curing. In contrast, the MCCo10 mix showed the lower chemically combined water content compared to MC18 mix. The MCCo30 mix showed the higher chemically combined water content compared to MC18 and MCCo10 mixes. The compressive strength and chemically combined water of all AACW mixes containing GGBFS (MCS10 and MCS30) were higher than those of AACW with no GGBFS (MC18). As the amount of GGBFS content increases the chemically combined water increases. The x-ray diffraction (XRD) proved that as the amount of CoW content increases, the degree of crystallinity increases. Conversely, the replacement of AACW by GGBFS leads to increase the amorphiticity character. The infrared spectroscopy (FTIR) confirms the higher reactivity of GGBFS compared to CoW as a result of successive hydration products formation, enhancing the compaction of microstructure as observed in scanning electron microscopy (SEM).","PeriodicalId":46242,"journal":{"name":"Advances in Materials Research-An International Journal","volume":null,"pages":null},"PeriodicalIF":2.2,"publicationDate":"2015-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66387498","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: 6

Biophysical properties of PPF/HA nanocomposites reinforced with natural bone powder 天然骨粉增强PPF/HA纳米复合材料的生物物理性能

IF 2.2

Advances in Materials Research-An International Journal Pub Date : 2015-09-25 DOI: 10.12989/AMR.2015.4.3.145

N. A. Kamel, S. H. Mansour, S. Abd-El-Messieh, W. Khalil, K. N. A. Nour

引用次数: 4