检索结果-南通市图书馆

Tensile Elastic Behavior of a Zr-Cu-Ag-Al Bulk Metallic Glass

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2014年第6期30卷 595-598页

作者： Q.P.Cao J.B.Jin Q.Yu X.D.Wang D.X.Zhang Y.Jiang J.Z.Jiang International Center for New-Structured Materials (ICNSM) State Key Laboratory of Silicon MaterialsDepartment of Materials Science and Engineering Zhejiang University Department of Mechanical Engineering University of Nevada Reno NV 89557 USA State Key Laboratory of Modern Optical Instrumentation Zhejiang University

Tensile elastic behavior of bulk Zr46（Cu4.5/5.5Ag1/5.5）46Al8 metallic glass was experimentally investigated. It exhibited linear and non-linear time-independent elastic deformation with a demarcative stress of approximately 500 MPa within the timescale in the present work, and repeated loading-unloading before yielding did not alter stress-strain relationship. The pure linear elastic strain limit is 0.6%, significantly lower than 2% as generally reported, but still much higher than 0.1% observed for typical crystalline alloys. Deviation from linear elastic behavior at stresses higher than 500 MPa is explained here as a macroscopic manifestation of local fluctuations in elastic strain, which becomes pronounced at stresses higher than the critical value. The occurrence of non-linear elasticity is possibly also related to the sinusoidal relationship between shear stress and atomic displacement.

关键词： Bulk metallic glass tension test Elastic-plastic deformation

Tensile Stiffness Analysis on Ocean Dynamic Power Umbilical

在线全文

学校读者我要写书评

暂无评论

China Ocean Engineering 2014年第2期28卷 259-270页

作者：汤明刚阎军王野岳前进 State Key Laboratory of Structural Analysis for Industrial Equipment Department of Engineering MechanicsDalian University of Technology

Tensile stiffness of ocean dynamic power umbilical is an important design parameter for functional implementation and structural safety. A column with radial stiffness which is wound by helical steel wires is constructed to predict the tensile stiffness value of umbilicals in the paper. The relationship between the tension and axial deformation is expressed analytically so the radial contraction of the column is achieved in the relationship by use of a simple finite element method. With an agreement between the theoretical prediction and the tension test results, the method is proved to be simple and efficient for the estimation of tensile stiffness of the ocean dynamic power umbilical.

关键词： dynamic power umbilical tensile stiffness radial stiffness FEM tension test

Modeling Methods and test Verification of Root Insert Contact Interface for Wind Turbine Blade

在线全文

学校读者我要写书评

暂无评论

Transactions of Nanjing University of Aeronautics and Astronautics 2016年第1期33卷 9-15页

作者： Li Hui Wang Tongguang Jiangsu Key Laboratory of Hi-Tech Research for Wind Turbine Design Nanjing University of Aeronautics and Astronautics

Two modeling methods of the root insert for wind turbine blade are presented,i.e.,the local mesh optimization method(LMOM)and the global modeling method(GMM).Based on the optimized mesh of the local model for the metal contact interface,LMOM is proposed to analyze the load path and stress distribution characteristics,while GMM is used to calculate and analyze the stress distribution characteristics of the resin layer established between the bushing and composite layers of root *** validate the GMM,a tension test is carried *** result successfully shows that the shear strain expresses a similar strain distribution tendency with the GMM′s results.

关键词： root insert modeling methods mesh optimization contact interface tension test

Characterization of tensile fracture in heavily alloyed Al-Si piston alloy

在线全文

学校读者我要写书评

暂无评论

Progress in Natural Science:Materials International 2011年第5期21卷 380-385页

作者： Guo-hua ZHANG~(1,2),Jian-xin ZHANG~3,Bing-chao LI~3,Wei CAI~1 1.School of Materials Science and Engineering,Harbin Institute of Technology,Harbin 150001,China 2.Shandong Binzhou Bohai Piston Co.,Ltd,Binzhou 256602,China 3.School of Materials Science and Engineering,Shandong University,Ji'nan 250061,China School of Materials Science and Engineering Harbin Institute of Technology Harbin 150001 China Shandong Binzhou Bohai Piston Co. Ltd Binzhou 256602 China School of Materials Science and Engineering Shandong University Ji'nan 250061 China

This paper focuses on a typical automotive piston material to characterize its fractographic appearance after tensile rupture. The fracture of this heavily alloyed Al—Si alloy takes place in a brittle *** consecutive eutectic zone is found to break by debonding of Si platelets from the Al matrix or by fracturing of Si *** various intermetallic particles break up complicatedly under the stress field of the propagating *** fracture tends to pass through or approach to the boundary between the eutectic Al matrix and Si platelets and there is a strong interaction between the propagating crack and the obstructing intermetallic compound.A tensile fracture mechanism in the heavily alloyed Al-Si alloy is elucidated.

关键词： tension test aluminum alloys facets fracture

Concepts and implementation of strain-based criteria in design codes for steel structures

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Frontiers of Structural and Civil Engineering 2012年第3期6卷 210-216页

作者： Reidar BJORHOVDE The Bjorhovde Group TucsonArizona 85750 USA

A uniaxial tension test is commonly used to determine the mechanical properties of steel,but it has no meaning for the response of the material in a *** test was developed as a consensus solution by producers,fabricators,designers and code writers,to have a standard by which similar materials could be compared to a common *** does not represent the actual behavior of the steel in a structure,and was never intended to do *** study the true behavior of the structure and how the material responds it would be better to determine the strains and deformations that will take place during actual service *** characteristics reflect the real behavior,whether in the elastic or inelastic *** stresses or forces are needed,these are easily determined by the value of the strain and the relevant material modulus,along with the type of cross section,whether elastic or *** paper addresses the properties of a range of structural steels,how these are incorporated into design standards and how the standards define deformation characteristics and demands for bolted and welded connections.

关键词： steel stress-strain characteristics tension test strain design actual behavior improved design codes

Influence of precipitation on the Portevin-Le Chatelier effect in Al-Mg alloys

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

Theoretical & Applied Mechanics Letters 2011年第1期1卷 30-33页

作者： Qi Hu,~(a))Qingchuan Zhang,~(b)) Shihua Fu,Pengtao Cao,and Ming Gong CAS Key Laboratory of Mechanical Behavior and Design of Materials,University of Science and Technology of China,Hefei 230027,China CAS Key Laboratory of Mechanical Behavior and Design of Materials University of Science and Technology of China Hefei 230027 China

In the alloy with solute content higher than the limiting solubility,the solute atoms that have failed to dissolve will precipitate from the solid solution and form *** this study, the Portevin-Le Chatelier(PLC) effects in annealed 5456 and 5052 aluminum alloys with different precipitation contents have been investigated under different applied strain *** results suggest that precipitations have significant effect on the PLC effect and the more the precipitations are, the greater the influence ***,the solute diffusion is pipe diffusion in 5052 alloy with lower precipitation ***,for 5456 alloy with higher precipitation content,the diffusion is no longer the case but more complex.

关键词： aluminum alloys Portevin-Le Chatelier effect dynamic strain aging tension test

Strength Prediction and test of FRP Composite Laminates with Central Hole

在线全文

学校读者我要写书评

暂无评论

Strength Prediction and Test of FRP Composite Laminates with...