检索结果-南通市图书馆

Competitive precipitation behavior of hybrid reinforcements in copper matrix composites fabricated by powder metallurgy

引用

International Journal of Minerals,Metallurgy and Materials 2021年第6期28卷 1090-1096页

作者： Tao Lan Yi-hui Jiang Xiao-jun Zhang Fei Cao Shu-hua Liang Shaanxi Province Key Laboratory for Electrical Materials and Infiltration Technology Xi’an University of TechnologyXi’an 710048China

Copper matrix composites reinforced by in situ-formed hybrid titanium boride whiskers(TiB_(w))and titanium diboride particles(TiB_(2p))were fabricated by powder metallurgy.Microstructural observations showed competitive precipitation behavior between TiB_(w) and TiB_(2p),where the relative contents of the two reinforcements varied with sintering temperature.Based on thermodynamic and kinetic assessments,the precipitation mechanisms of the hybrid reinforcements were discussed,and the formation of both TiB_(w) and TiB_(2p) from the local melting zone was thermodynamically favored.The precipitation kinetics were mainly controlled by a solid-state diffusion of B atoms.By forming a compact compound layer,in situ reactions were divided into two stages,where Zener growth and Dybkov growth prevailed,respectively.Accordingly,the competitive precipitation behavior was attributed to the transition of the growth model during the reaction process.

关键词： metal matrix composite hybrid reinforcement in situ reaction growth kinetics

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Fatigue shear performance of concrete beams reinforced with hybrid(glass-fiber-reinforced polymer+steel)rebars and stirrups

引用

Frontiers of Structural and Civil Engineering 2021年第3期15卷 576-594页

作者： Peng ZHU Jiajing XU Wenjun QU Department of Structural Engineering Tongji UniversityShanghai200092China School of Transportation and Civil Engineering Nantong UniversityNantong226019China

Reinforced concrete beams consisting of both steel and glass-fiber-reinforced polymer rebars exhibit excellent strength,serviceability,and durability.However,the fatigue shear performance of such beams is unclear.Therefore,beams with hybrid longitudinal bars and hybrid stirrups were designed,and fatigue shear tests were performed.For specimens that failed by fatigue shear,all the glass-fiber-reinforced polymer stirrups and some steel stirrups fractured at the critical diagonal crack.For the specimen that failed by the static test after 8 million fatigue cycles,the static capacity after fatigue did not significantly decrease compared with the calculated value.The initial fatigue level has a greater influence on the crack development and fatigue life than the fatigue level in the later phase.The fatigue strength of the glass-fiber-reinforced polymer stirrups in the specimens was considerably lower than that of the axial tension tests on the glass-fiber-reinforced polymer bar in air and beam-hinge tests on the glass-fiber-reinforced polymer bar,and the failure modes were different.Glass-fiber-reinforced polymer stirrups were subjected to fatigue tension and shear,and failed owing to shear.

关键词： fatigue shear hybrid stirrups hybrid reinforcement fiber-reinforced polymer

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

3D Fe Analsysis for the Seismic Behavior of hybrid Steel-frp Reinforced Concrete Beam-column Joints

3D Fe Analsysis for the Seismic Behavior of Hybrid Steel-frp...

引用

作者： Haitham Abdelhameed Ibrahim Mohamed（和穆）东南大学

学位级别：硕士

本研究提出了钢筋—纤维增强聚合物(FRP)复合材料作为钢筋混凝土框架结构的主筋。本研究的设计方案基于目前的抗震设计研究规范。本文建立了三维有限元模型,考虑到材料和几何非线性以及钢筋和GFRP粘结滑移性能,通过有限元的分析并与现... 详细信息

本研究提出了钢筋—纤维增强聚合物(FRP)复合材料作为钢筋混凝土框架结构的主筋。本研究的设计方案基于目前的抗震设计研究规范。本文建立了三维有限元模型,考虑到材料和几何非线性以及钢筋和GFRP粘结滑移性能,通过有限元的分析并与现有的实验结果进行校正。本文对54种钢筋—GFRP组合结构的性能进行了研究,包括适筋和超筋的情况。针对SFCB筋的分析表明,FRP筋的有效配筋率和适度的配筋率(归—化的配筋率)是保证结构满足抗震性能的主要参数,同时。通过分析给出了配筋率的最高值和最低值。通过近似的FRP-钢筋设计比例分析,提出的设计建议考虑了主动设计的可维护状态、屈服后状态、剩余强度和SFCB筋的极限状态。最后,提出了针对不同FRP-钢筋配筋比例的通用力学模型。

关键词： Beam-column joint hybrid reinforcement Lateral response Finite element model FRP

来源：

同方学位论文库评论

在线全文

同方学位论文库

学校读者我要写书评

暂无评论

Study on the Crack Spacing of Concrete Flexural Member hybrid Reinforced with BFRP Tendons and Steel Bars

Study on the Crack Spacing of Concrete Flexural Member Hybri...

引用

2009中国上海国际建筑科技大会

作者： GE Wenjie~1,ZHANG Jiwen~1,TU Yongming~(1,2),LV Jianpin~1 (1 Key Laboratory of Concrete and Prestressed Concrete Structure of Ministry of Education, Southeast University,Nanjing 210096,China 2 State Key Laboratory of Subtropical Building Science,South China University of Technology, Guangzhou 510640,China)

＜正＞According to the crack spacing calculation theory of reinforced concrete flexural member,crack spacing theory of concrete beam hybrid reinforced with BFRP tendons and steel bars was analyzed and the crack spacing calculation formula was proposed.Three different area ratios of BFRP tendons to steel bars hybrid reinforced concrete beams,one BFRP reinforced concrete beam and one reinforced concrete beam static bending test were made, the formula was modified and the unknown coefficients were determined according to the test.

关键词： BFRP tendon hybrid reinforcement flexural member crack spacing

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：