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Influence of Fabric Parameters on Microstructure,Mechanical Properties and Failure Mechanisms in Carbon-Fibre Reinforced Composites 被引量:2
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作者 B.Wielage D.Richter +1 位作者 H.Mucha Th.Lampke 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2008年第6期953-959,共7页
The effects of fibre/matrix bonding, fabric density, fibre volume fraction and bundle size on microstructure, mechanical properties and failure mechanisms in carbon fibre reinforced composites (plastic and carbon mat... The effects of fibre/matrix bonding, fabric density, fibre volume fraction and bundle size on microstructure, mechanical properties and failure mechanisms in carbon fibre reinforced composites (plastic and carbon matrix) have been investigated. The microstructure of unloaded and cracked samples was studied by optical microscopy and scanning electron microscopy (SEM), respectively whereas the mechanical behaviour was examined by 3- point bending experiments. Exclusively one type of experimental resole type phenolic resin was applied. A strong fibre/matrix bonding, which is needed for high strength of carbon fibre reinforced plastic (CFRP) materials leads to severe composite damages during the pyrolysis resulting in low strength, brittle failure and a very low utilisation of the fibres strain to failure in C/C composites. Inherent fabric parameters such as an increasing fabric density or bundle size or a reduced fibre volume fraction introduce inhomogenities to the CFRP's microstructure. Results are lower strength and stiffness whereas the strain to failure increases or remains unchanged. Toughness is almost not affected. In C/C composites inhomogenities due to a reduced bundle size reduce strain to failure, strength, stiffness and toughness. Vice versa a declining fibre volume fraction leads to exactly the opposite behaviour. Increasing the fabric density (weight per unit area) causes similar effects as in CFRPs. 展开更多
关键词 CFRPs C/C fibre/matrix bonding Fabric density fibre volume fraction Roving size microstructure Failure behaviour
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Higher-order effects on self-similar parabolic pulse in the microstructured fibre amplifier 被引量:1
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作者 刘伟慈 徐文成 +3 位作者 冯杰 陈伟成 李书贤 刘颂豪 《Chinese Physics B》 SCIE EI CAS CSCD 2008年第3期1025-1028,共4页
By considering higher-order effects, the properties of self-similar parabolic pulses propagating in the microstructured fibre amplifier with a normal group-velocity dispersion have been investigated. The numerical res... By considering higher-order effects, the properties of self-similar parabolic pulses propagating in the microstructured fibre amplifier with a normal group-velocity dispersion have been investigated. The numerical results indicate that the higher-order effects can badly distort self-similar parabolic pulse shape and optical spectrum, and at the same time the peak shift and oscillation appear, while the pulse still reveals highly linear chirp but grows into asymmetry. The influence of different higher-order effects on self-similar parabolic pulse propagation has been analysed. It shows that the self-steepening plays a more important role. We can manipulate the geometrical parameters of the microstructured fibre amplifier to gain a suitable dispersion and nonlinearity coefficient which will keep high-quality self-similar parabolic pulse propagation. These results are significant for the further study of self-similar parabolic pulse propagation. 展开更多
关键词 self-similar parabolic pulse microstructured fibre amplifier higher-order dispersion nonlinear effect
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Polarization dependent dispersion and its impact on optical parametric process in high nonlinear microstructure fibre
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作者 肖礼 张巍 +1 位作者 黄诩东 彭江得 《Chinese Physics B》 SCIE EI CAS CSCD 2008年第3期995-999,共5页
High nonlinear microstructure fibre (HNMF) is preferred in nonlinear fibre optics, especially in the applications of optical parametric effects, due to its high optical nonlinear coefficient. However, polarization d... High nonlinear microstructure fibre (HNMF) is preferred in nonlinear fibre optics, especially in the applications of optical parametric effects, due to its high optical nonlinear coefficient. However, polarization dependent dispersion will impact the nonlinear optical parametric process in HNMFs. In this paper, modulation instability (MI) method is used to measure the polarization dependent dispersion of a piece of commercial HNMF, including the group velocity dispersion, the dispersion slope, the fourth-order dispersion and group birefringence. It also experimentally demonstrates the impact of the polarization dependent dispersion on the continuous wave supercontinuum (SC) generation. On one axis MI sidebands with symmetric frequency detunings are generated, while on the other axis with larger MI frequency detuning, SC is generated by soliton self-frequency shift. 展开更多
关键词 microstructure fibre modulation instability DISPERSION BIREFRINGENCE
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Effect of structure random disturbances on characterizations of microstructured optical fibres
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作者 陆洋 张冶金 +3 位作者 杨四刚 彭小舟 陈向飞 谢世钟 《Chinese Physics B》 SCIE EI CAS CSCD 2005年第11期2235-2240,共6页
A method is presented to analyse the effect of structure random disturbances on the confinement loss and the chromatic dispersion characterizations of microstructured optical fibres, which combines multipole methods w... A method is presented to analyse the effect of structure random disturbances on the confinement loss and the chromatic dispersion characterizations of microstructured optical fibres, which combines multipole methods with the random statistics process. Some useful results to the fabrication of microstructured optical fibres have been obtained. 展开更多
关键词 microstructured optical fibres (MOFs) DISPERSION LOSS multipole methods
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Photoluminescence of an Yb^(3+)/Al^(3+)-codoped microstructured optical fibre
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作者 夏长明 周桂耀 +1 位作者 韩颖 侯蓝田 《Chinese Physics B》 SCIE EI CAS CSCD 2011年第8期443-448,共6页
An Yba+/Al3+-codoped microstructured optical fibre is prepared based on photonic crystal fibre technology. The characteristic spectra of preforms and fibres are experimentally investigated. The results show that und... An Yba+/Al3+-codoped microstructured optical fibre is prepared based on photonic crystal fibre technology. The characteristic spectra of preforms and fibres are experimentally investigated. The results show that under a 971 nm excitation, besides the known infrared fluorescence luminescence around 1050 nm, a blue luminescence peak at 486 nm is obtained. Moreover, an unexpected emission peak at 730 nm is also observed. The photoluminescence mechanism of an Yba+/Al3+-codoped microstructured optical fibre is discussed. The emission peak at 486 nm is attributed to the cooperative upconversion resulting from pairs of Yb3+ ions, and the emission peak around 730 nm is ascribed to the stimulated Raman scattering because of nonlinear effects of microstructured optical fibre. The Yba+/Al3+-codoped microstructured optical fibre is promising for varieties of applications from laser printing and optical recording to cancer treatments, such as photodynamic therapy. 展开更多
关键词 PHOTOLUMINESCENCE Yba+/Al3+-codoped microstructured optical fibre
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Role of Flexible Macro Fibre Composite (MFC) Actuator on Bragg Wavelength Tuning in Microstructure Polymer Optical Fibre Long Period Grating for Strain Sensing Applications
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作者 Asok K. Dikshit Akhil Raj V. L. 《Journal of Sensor Technology》 2013年第3期75-83,共9页
The microstructure polymer optical fibre (mPOF) inscribed long period grating (LPG) offers a wide field of application in strain sensors arena within the materials elastic limit. Flexible innovative macro fibre compos... The microstructure polymer optical fibre (mPOF) inscribed long period grating (LPG) offers a wide field of application in strain sensors arena within the materials elastic limit. Flexible innovative macro fibre composite (MFC) actuator generates electromechanical force under DC driving voltage. We propose a novel method for Bragg wavelength blue shifting through stretch tuning of mPOF LPG in axial direction under applied DC voltage on attached MFC with LPG. The grating period of mPOF LPG changes refractive index and causes blue shift of Bragg grating fibre wavelength. The shifting governs on the values of generated electromechanically strain transfer from flexible MFC to mPOF LPG and they have potential applications in strain sensor. 展开更多
关键词 microstructure POLYMER Optical fibre (mPOF) Long Period Grating (LPG) MACRO fibre COMPOSITE (MFC) ACTUATOR Strain Sensing Blue Shifting
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The Interfacial Microstructure of Al_2O_3 Fibre Reinforced Al-5.5Zn Matrix Composite
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作者 Zhang Xiyan Gao Qing Liu Shikai Department of Materials Science and Engineering,Southwest Jiaotong University,Chengdu 610031,China 《Journal of Modern Transportation》 1996年第2期61-64,共4页
The interfacial microstructure of Al 2O 3 short fibre reinforced Al 5.5Zn matrix composite was studied using transmission electron microscope (TEM) in this ... The interfacial microstructure of Al 2O 3 short fibre reinforced Al 5.5Zn matrix composite was studied using transmission electron microscope (TEM) in this paper.Experimental results show that there exist a diffusional layer with a wide thickness range and a third phase in the fibre/matrix interface,resulting from Al/SiO 2 reaction.Some of the reduced silicon atoms adhere to the fibre/matrix interface and nucleate to form the elemental eutectic silicon,and the others diffuse into the Al/Zn melt and form the diffusional layer.The complexity of the interfacial microstructure may result from the different solidification conditions between the regions in the melt because of the non uniformity of the fibre distribution and orientation in the preform. 展开更多
关键词 COMPOSITE AL 2O 3 fibre microstructure aluminum alloy
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Effect of silica fume and glass powder for enhanced impact resistance in GGBFS-based ultra high-performance geopolymer fibrous concrete:An experimental and statistical analysis
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作者 G.Murali Anoop Kallamalayil Nassar +2 位作者 Madhumitha Swaminathan Parthiban Kathirvel Leong Sing Wong 《Defence Technology(防务技术)》 SCIE EI CAS CSCD 2024年第11期59-81,共23页
Solid waste recycling is an economically sound strategy for preserving the environment,safeguarding natural resources,and diminishing the reliance on raw material consumption.Geopolymer technology offers a significant... Solid waste recycling is an economically sound strategy for preserving the environment,safeguarding natural resources,and diminishing the reliance on raw material consumption.Geopolymer technology offers a significant advantage by enabling the reuse and recycling of diverse materials.This research assesses how including silica fume and glass powder enhances the impact resistance of ultra-high-performance geopolymer concrete(UHPGC).In total,18 distinct mixtures were formulated by substituting ground granulated blast furnace slag with varying proportions of silica fume and glass powder,ranging from 10%to 40%.Similarly,for each of the mixtures above,steel fibre was added at a dosage of 1.5%to address the inherent brittleness of UHPGC.The mixtures were activated by combining sodium hydroxide and sodium silicate solution to generate geopolymer binders.The specimens were subjected to drop-weight impact testing,wherein an examination was carried out to evaluate various parameters,including flowability,density at fresh and hardened state,compressive strength,impact numbers indicative of cracking and failure occurrences,ductility index,and analysis of failure modes.Additionally,the variations in the impact test outcomes were analyzed using the Weibull distribution,and the findings corresponding to survival probability were offered.Furthermore,the microstructure of UHPGC was scrutinized through scanning electron microscopy.Findings reveal that the specimens incorporating glass powder exhibited lower cracking impact number values than those utilizing silica fume,with reductions ranging from 18.63%to 34.31%.Similarly,failure impact number values decreased from 8.26%to 28.46%across glass powder contents.The maximum compressive and impact strength was recorded in UHPGC,comprising 10%silica fume with fibres. 展开更多
关键词 Silica fume Glass powder Impact strength Steel fibre GGBFS Weibull analysis microstructure
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Manufacturing Titanium Metal Matrix Composites by Consolidating Matrix Coated Fibres 被引量:3
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作者 Hua-Xin PENGDepartment of Aerospace Engineering, University of Bristol, University Walk, Bristol, BS8 1TR, UK 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2005年第5期647-651,共5页
Titanium metal matrix composites (TiMMCs) reinforced by continuous silicon carbide fibres are being developed for aerospace applications. TiMMCs manufactured by the consolidation of matrix-coated fibre (MCF) metho... Titanium metal matrix composites (TiMMCs) reinforced by continuous silicon carbide fibres are being developed for aerospace applications. TiMMCs manufactured by the consolidation of matrix-coated fibre (MCF) method offer optimum properties because of the resulting uniform fibre distribution, minimum fibre damage and fibre volume fraction control. In this paper, the consolidation of Ti-6Al-4V matrix-coated SiC fibres during vacuum hot pressing has been investigated. Experiments were carried out on multi-ply MCFs under vacuum hot pressing (VHP). In contrast to most of existing studies, the fibre, arrangement has been carefully controlled either in square or hexagonal arrays throughout the consolidated sample. This has enabled the dynamic consolidation behaviour of MCFs to be demonstrated by eliminating the fibre re-arrangement during the VHP process. The microstructural evolution of the matrix coating was reported and the deformation mechanisms involved were discussed. 展开更多
关键词 Titanium matrix composites Matrix-coated fibres Vacuum hot pressing microstructure Dynamic denslfication
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Interfacial Interaction in Coated Carbon Fibre Reinforced Aluminous Mg-based Composites 被引量:1
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作者 Kun LI Nanlin SHI +1 位作者 Jun GONG Chao SUN 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2008年第6期936-940,共5页
Four kinds of Mg alloys reinforced with carbon fibres were fabricated by a gas pressure infiltration technique. The fibres were pre-coated a SiO2 layer prior to fabrication. DifFerent microstructures and interactions ... Four kinds of Mg alloys reinforced with carbon fibres were fabricated by a gas pressure infiltration technique. The fibres were pre-coated a SiO2 layer prior to fabrication. DifFerent microstructures and interactions in the fibre-matrix interface of these composites were observed by transmission electron microscopy (TEM). The results showed that the interracial interaction strongly depended on the content of Al in the Mg-based matrices. The microstructure of the interface could then be controlled by adjusting the Al content of the Mgbased matrix. In addition, fibres extracted from different Mg-based matrix all had some degradation owing to the interracial reaction and the fibre-matrix interdiffusion. 展开更多
关键词 Carbon fibre SiO2 coating microstructure INTERFACE
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High temperature tensile,compression and creep behavior of recycled short carbon fibre reinforced AZ91 magnesium alloy fabricated by a high shearing dispersion technique 被引量:1
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作者 Sinan Kandemir Sarkis Gavras Hajo Dieringa 《Journal of Magnesium and Alloys》 SCIE EI CAS CSCD 2021年第5期1773-1787,共15页
The present study seeks the feasibility of using short carbon fibres recycled from polymer matrix composites as alternative to virgin carbon fibres in the reinforcement of magnesium alloys.The microstructures,high tem... The present study seeks the feasibility of using short carbon fibres recycled from polymer matrix composites as alternative to virgin carbon fibres in the reinforcement of magnesium alloys.The microstructures,high temperature mechanical and creep properties of AZ91 alloy and its composites with various recycled carbon fibre contents(2.5 and 5 wt.%)and lengths(100 and 500μm)were investigated in the temperature range of 25-200℃.The microstructural characterization showed that the high shear dispersion technique provided the cast composites with finer grains and relatively homogenous distribution of fibres.The materials tested displayed different behaviour depending on the type of loading.In general,while enhancements in the mechanical properties of composites is attributed to the load bearing and grain refinement effects of fibres,the fluctuations in the properties were discussed on the basis of porosity formation,relatively high reinforcement content leading to fibre clustering and interlayer found between the matrix and reinforcement compared to those of AZ91 alloy.The compressive creep tests revealed similar or higher minimum creep rates in the recycled carbon fibre reinforced AZ91 in comparison to the unreinforced AZ91. 展开更多
关键词 Metal matrix composites Magnesium alloys Recycled carbon fibre High-shear dispersion microstructure Mechanical properties CREEP
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The Relationship of Microstructure, Density and Bending Strength Properties of Blighia sapida
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作者 Gladys A. Quartey 《Journal of Materials Science and Chemical Engineering》 2022年第5期29-39,共11页
Wood anatomical structures of various tree species help identify the wood. The characteristics and composition of these structures affect their utilisation. In this work, the microstructure of Blighia sapida a lesser-... Wood anatomical structures of various tree species help identify the wood. The characteristics and composition of these structures affect their utilisation. In this work, the microstructure of Blighia sapida a lesser-known Ghanaian hardwood species using light microscope and scanning electron microscope (SEM) was studied. The relationship between the microstructure and some physical properties such as density, and bending strength were also studied. The anatomical features studied were fibre length, double fibre wall thickness, fibre proportion, vessel diameter and proportion, rays and axial parenchyma proportions. It was observed that the use of SEM in studying the anatomical or ultra-structural aspects of wood gives a clearer understanding of the features and structures found in wood. Anatomical features such as presence of crystals and absence of axial parenchyma in Blighia sapida are reported in the work. The study also established that Blighia sapida had a low water uptake even though it had vessel distribution of 12 vessels/mm<sup>2</sup>. Having not very distinct axial parenchyma may have accounted for the low water uptake. The presence of occluded pits could also account for the low water uptake and the fibre wall thickness may also account for a medium bending strength of 62.8 N/mm<sup>2</sup> at 12% moisture content. 展开更多
关键词 microstructure Blighia sapida Scanning Electron Microscope fibre Length Axial Parenchyma DENSITY Bending Strength ABSORPTION
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大孔柚子型微结构光纤探针的表面增强拉曼散射性能研究
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作者 李佳轩 付子珍 +5 位作者 曹茜清 胡志国 付兴虎 付广伟 金娃 毕卫红 《光谱学与光谱分析》 SCIE EI CAS CSCD 北大核心 2024年第2期527-533,共7页
随着光纤制备工艺以及纳米材料制备技术的发展,光纤探针已成为一种新型的表面增强拉曼散射(SERS)基底,通过在普通单模光纤或多模光纤上制备不同的结构并修饰相应的纳米材料,可以得到多种类型的光纤表面增强拉曼散射探针,并实现较好的检... 随着光纤制备工艺以及纳米材料制备技术的发展,光纤探针已成为一种新型的表面增强拉曼散射(SERS)基底,通过在普通单模光纤或多模光纤上制备不同的结构并修饰相应的纳米材料,可以得到多种类型的光纤表面增强拉曼散射探针,并实现较好的检测效果。但受限于光纤本身的结构,普通光纤仅能利用端面或侧表面提供拉曼检测的“热点”区域,限制了其SERS性能的进一步提高。因此制备了大孔柚子型微结构光纤(MSF)表面增强拉曼散射(SERS)探针,其中大孔柚子型MSF SERS探针结构通过一段阶跃多模光纤与柚子型微结构光纤熔接制得。实验分别对自制的纳米银溶胶基底以及大孔柚子型MSF SERS探针的SERS性能进行检测。采用溶胶自组装法制备负载银纳米颗粒的MSF SERS探针,通过控制自组装时间制备不同光纤SERS探针(Ag/MSF-x,其中x为自组装时间,分别为15、30、45、60 min)。采用溶液检测方法,利用Ag/MSF-x探针对10^(-3) mol·L^(-1)的亚甲基蓝(MB)探针分子进行检测,通过比较相同条件下的增强效果筛选得到Ag/MSF-45探针。为进一步检测Ag/MSF-45探针的SERS性能,制备不同浓度的MB溶液,分别利用纳米银溶胶基底和Ag/MSF-45探针对其进行检测。实验结果表明,纳米银溶胶基底对MB的检测限(LOD)为10^(-6) mol·L^(-1),Ag/MSF-45探针对MB的检测限(LOD)为10^(-7) mol·L^(-1);拉曼信号的再现性结果表明纳米银溶胶基底以及Ag/MSF-45探针在各个特征峰处的RSD值均在合理范围内;在1619 cm^(-1)拉曼位移处对纳米银溶胶基底以及Ag/MSF-45探针检测MB的拉曼强度和浓度进行对数转换拟合,纳米银溶胶基底的拟合优度R2达0.91628,Ag/MSF-45探针的拟合优度R2达0.98848;纳米银溶胶基底和Ag/MSF-45探针的再现性结果表明,其在各个特征峰处的RSD值均处于合理范围,但Ag/MSF-45探针的各特征峰RSD值均小于纳米银溶胶基底,最大为13.89%;利用10^(-6) mol·L^(-1)的MB对Ag/MSF-45探针的增强因子(AEF)进行计算,Ag/MSF-45探针的AEF达到6.09×10^(6),表现出良好的增强效果。因此,基于大孔柚子型MSF SERS探针凭借独特的空气孔结构使其具有较高的灵敏度以及良好的再现性,且其SERS性能均优于纳米银溶胶基底,在农业、化学分析、生物检测等领域及大分子物质检测等方面应用前景广泛。 展开更多
关键词 表面增强拉曼散射 柚子型微结构光纤 光纤探针 纳米银溶胶 亚甲基蓝
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纤维影响胶结充填体初始微观结构及流动性能研究
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作者 宋学林 张春雷 +2 位作者 付玉华 赖泽金 管华栋 《有色金属工程》 CAS 北大核心 2024年第9期138-149,共12页
为探究聚丙烯纤维与玻璃纤维对胶结充填体初始微观结构及流动性能的影响,采用坍落度及扩展度表征料浆流动性,并用SEM和核磁共振设备对掺与未掺纤维充填体初始微观结构进行分析。结果表明:纤维的掺入会对充填料浆的流动性产生负面影响,... 为探究聚丙烯纤维与玻璃纤维对胶结充填体初始微观结构及流动性能的影响,采用坍落度及扩展度表征料浆流动性,并用SEM和核磁共振设备对掺与未掺纤维充填体初始微观结构进行分析。结果表明:纤维的掺入会对充填料浆的流动性产生负面影响,具体呈现玻璃纤维(BL)>混合纤维(HB)>聚丙烯纤维(JBX);此外,料浆的坍落度及扩展度随水泥含量的增加基本遵循一次函数递减关系;纤维能有效阻碍孔隙裂隙的生成,但纤维的类型并不会显著影响充填体的微观结构;同时水泥含量越高,基体内部结构更加密实;核磁结果显示,充填体的T_(2)图谱均呈现3个波峰,与无纤维充填体相比,掺纤维充填体的的信号强度较低,波峰总面积较小,并且第一波峰面积占比增大,第二及第三波峰面积减小。研究结论可为矿山应用纤维增强技术提供理论参考依据。 展开更多
关键词 纤维 胶结充填体 流动性能 微观结构
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Microstructural evolution of polymer-derived hexagonal boron nitride fibres under high-temperature stretching 被引量:2
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作者 Zhiguang Wang Min Ge +5 位作者 Shouquan Yu Xiaoming Sun Xueli Qi Hao Zhang Wen Xiao Weigang Zhang 《Journal of Advanced Ceramics》 SCIE EI CAS CSCD 2023年第10期1973-1988,共16页
High-temperature stretching plays a crucial role in enhancing the performance of fibres,while a quantitative investigation into the impacts of tension and stretching duration on the microstructure and performance of h... High-temperature stretching plays a crucial role in enhancing the performance of fibres,while a quantitative investigation into the impacts of tension and stretching duration on the microstructure and performance of hexagonal boron nitride(h-BN)fibres remains absent.In this study,to elucidate the microstructural evolution of the h-BN fibres under thermal stretching,amorphous BN fibres were heated at 2000℃under tension of 30,50,and 70 N for 1,3,and 5 h in a nitrogen atmosphere.Subsequently,the grain size,pore structure,orientation degree,microscopic morphology,and mechanical properties were analysed at room temperature.The results show that high-temperature stretching enhances the orientation degree of the BN fibres,consequently elevating Young’s modulus.The maximum orientation degree of the BN fibres was 86%,aligning with a corresponding Young’s modulus of 206 GPa.Additionally,high-temperature stretching enlarged the sizes of grains and pores,a fact substantiated by the radial cracking of the fibres upon extending thermal stretching time.Owing to the expanded pore structure of the BN fibres and the inability to form a sufficiently strong“card structure”between shorter microfibre bundles,the tensile strength of the BN fibres did not increase continually,reaching a maximum of 1.0 GPa.Microstructural observations revealed that the BN fibres,composed of highly oriented lamellar h-BN grains,tend to form radial textures under high-tensile thermal stretching and onion-skin textures under prolonged thermal stretching.These findings offer a theoretical foundation for the preparation of high-performance h-BN fibres. 展开更多
关键词 polymer-derived ceramics boron nitride fibres microstructural evolution high-temperature stretching
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全沙漠砂纤维水泥基复合材料单轴受压尺寸效应试验研究 被引量:3
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作者 张朵 夏多田 +2 位作者 程建军 生兆亮 周长乐 《应用力学学报》 CAS CSCD 北大核心 2023年第1期127-134,共8页
为探究新疆地区全沙漠砂制备水泥基复合材料ECC(engineered cementitious composite)的可行性,并研究全沙漠砂ECC的单轴受压尺寸效应,在对沙漠砂、石英砂和河砂三种骨料制备的ECC宏观力学性能及微观结构分析比较的基础上,重点对5组不同... 为探究新疆地区全沙漠砂制备水泥基复合材料ECC(engineered cementitious composite)的可行性,并研究全沙漠砂ECC的单轴受压尺寸效应,在对沙漠砂、石英砂和河砂三种骨料制备的ECC宏观力学性能及微观结构分析比较的基础上,重点对5组不同尺寸的沙漠砂ECC试件进行了单轴压缩性能试验。结果表明:在相同的材料配比下,完全使用沙漠砂制备的ECC,其抗压、抗拉以及抗折强度均与其余两种砂制备的ECC相近,沙漠砂ECC中纤维表面较少的附着物和较为完整的形貌对其发挥桥联作用有益;全沙漠砂ECC单轴受压性能具有尺寸效应;提出的高厚比与抗压强度的关系表达式、不同高厚比的应力-应变全曲线模型均与试验结果吻合较好。 展开更多
关键词 纤维混凝土 沙漠砂 水泥基复合材料 微观结构 尺寸效应 应力-应变曲线
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短纤维新预处理方法对短纤维-橡胶复合材料界面结构的影响及粘合机理 被引量:9
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作者 张立群 周彦豪 +4 位作者 李东红 陆熙瑜 黄毅 者东梅 张宇东 《橡胶工业》 CAS 北大核心 1994年第7期388-394,共7页
通过扫描电镜、透射电镜、红外光谱、应力一应变曲线等进一步研究了新法预处理尼龙、聚酯短纤维-橡胶复合材料的界面形态。认为新预处理方法能使尼龙、聚酯短纤维与基质间形成牢固的界面层.使应力良好地向短纤维传递.从而充分发挥短... 通过扫描电镜、透射电镜、红外光谱、应力一应变曲线等进一步研究了新法预处理尼龙、聚酯短纤维-橡胶复合材料的界面形态。认为新预处理方法能使尼龙、聚酯短纤维与基质间形成牢固的界面层.使应力良好地向短纤维传递.从而充分发挥短纤维的补强作用。最佳粘合剂用量与纤维长度之间存在一个平衡值。 展开更多
关键词 预处理 补强 短纤维 橡胶 粘合
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碳气凝胶的微结构控制 被引量:6
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作者 沈军 薛辉 +1 位作者 吴广明 周斌 《同济大学学报(自然科学版)》 EI CAS CSCD 北大核心 2007年第6期779-782,共4页
探索新型纳米多孔材料碳气凝胶的微结构控制,研究常压条件下纤维增强型碳气凝胶的制备,以及催化剂浓度、质量分数、纤维表面特性、溶胶注入纤维前的老化时间等制备参数对其微结构的影响.通过扫描电镜(SEM)、孔径分布和电阻率测量等测试... 探索新型纳米多孔材料碳气凝胶的微结构控制,研究常压条件下纤维增强型碳气凝胶的制备,以及催化剂浓度、质量分数、纤维表面特性、溶胶注入纤维前的老化时间等制备参数对其微结构的影响.通过扫描电镜(SEM)、孔径分布和电阻率测量等测试手段,发现可通过制备参数实现碳气凝胶从纳米到微米量级的控制. 展开更多
关键词 碳气凝胶 纤维增强 微结构
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注射成型短玻纤增强PP微观结构及力学性能研究 被引量:6
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作者 刘保臣 申长雨 +1 位作者 刘春太 上官林建 《工程塑料应用》 CAS CSCD 北大核心 2009年第6期52-55,共4页
测定了注射成型短玻璃纤维增强聚丙烯的微观结构及有效拉伸弹性模量,定量分析了微观结构对材料力学性能的影响,测定了纤维长度分布及取向分布。采用Mori-Tanaka模型计算了单取向短纤维增强复合材料的拉伸弹性模量,采用取向平均法计算了... 测定了注射成型短玻璃纤维增强聚丙烯的微观结构及有效拉伸弹性模量,定量分析了微观结构对材料力学性能的影响,测定了纤维长度分布及取向分布。采用Mori-Tanaka模型计算了单取向短纤维增强复合材料的拉伸弹性模量,采用取向平均法计算了具有任意平面取向的单层板材料弹性常数,运用层合板理论计算了短纤维增强复合材料的整体有效拉伸弹性模量,实验对比证明,这种方法是有效的。 展开更多
关键词 纤维取向 短纤维增强复合材料 力学性能 注射成型 微观结构
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真空烧结制备316L不锈钢纤维/HA复合生物材料及其理化性能 被引量:8
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作者 邹俭鹏 阮建明 +3 位作者 黄伯云 周忠诚 申雄军 周智华 《复合材料学报》 EI CAS CSCD 北大核心 2005年第5期39-46,共8页
用真空烧结成功制备了不同成分316L不锈钢纤维/HA复合生物材料和316L不锈钢纤维/HA-ZrO2(CaO)复合生物材料,并通过金相显微镜、SEM、EDXA分析了材料的微观结构、断裂性能和微区元素含量。结果表明:不锈钢纤维和纳米ZrO2(CaO)粒子对复合... 用真空烧结成功制备了不同成分316L不锈钢纤维/HA复合生物材料和316L不锈钢纤维/HA-ZrO2(CaO)复合生物材料,并通过金相显微镜、SEM、EDXA分析了材料的微观结构、断裂性能和微区元素含量。结果表明:不锈钢纤维和纳米ZrO2(CaO)粒子对复合材料具有增强和增韧的作用。综合考虑认为,20%316L不锈钢纤维/HA-ZrO2(CaO)复合材料的性能最优,其抗弯强度和抗压强度分别为140.1 MPa和348.9 MPa。316L不锈钢纤维/HA-ZrO2(CaO)复合材料抗弯强度随316L不锈钢纤维直径和长度减小而增大,且纤维长度对抗弯强度的影响略大于纤维直径的影响。复合材料微观组织随HA粉末和316L不锈钢纤维成分变化呈规律性变化,没有出现明显的裂纹或孔隙,HA和316L不锈钢纤维结合紧密,界面平整,两相融合程度较高。5%316L不锈钢纤维复合材料表现为脆性断裂,而10%、20%、40%316L不锈钢纤维复合材料均表现为韧性断裂,且韧性程度随316L不锈钢纤维含量依次增加。基体与韧化相均相对独立,二者之间不发生任何化学反应,基体HA中发生微量的Fe元素扩散,但在316L不锈钢中不发生基体的扩散。 展开更多
关键词 真空烧结 316L不锈钢纤维 生物材料 微观结构 理化性能
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