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bending mechanical properties of W/TiN/Ta composites with interfacial TiN coatings

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Rare Metals 2023年第5期42卷 1718-1723页

作者： Gao-Yong Xu Tong Zhou Ying Zhang Jin-Ping Suo State Key Laboratory of Mould Technology Institute of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China

Tungsten is one of best candidates for plasma facing materials(PFMs)in fusion *** its application in fusion areas is strongly restricted by the inherent brittleness and high ductile-brittle transition *** improve the toughness of W-based materials,W/TiN/Ta-laminated composites were fabricated by spark plasma ***-point bending test was performed to investigate the bending mechanical *** crack propagation is the main crack propagation mode in W/TiN/Ta *** dissipation by interfacial debonding and crack deflection at interfaces as well as crack bridging by Ta foils and plastic deformation of Ta can contribute to the toughening of W/TiN/Ta *** existence of interfacial TiN coatings can act as weak points and promote interfacial *** coatings with(111)preferred orientation are found to be conducive to the strengthening of W/TiN/Ta composites.

关键词： Multilayer structure Interfacial TiN coatings bending test Toughness

Experimental Study on the Influence of Cross-Section Type of Marine Cable Conductors on the bending Performance

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China Ocean Engineering 2022年第4期36卷 629-637页

作者： YAN Jun HU Hai-tao LU Hai-long YIN Yuan-chao BU Yu-feng LU Qing-zhen State Key Laboratory of Structural Analysis for Industrial Equipment Department of Engineering MechanicsInter-national Research Center for Computational MechanicsDalian University of TechnologyDalian 116024China Ningbo Research Institute of Dalian University of Technology Ningbo 315016China State Key Laboratory of Structural Analysis for Industrial Equipment School of Ocean Science and TechnologyDalian University of TechnologyPanjin 124221China

Through the development of marine energy,marine cables are the key equipment for transmission of electrical energy between surface platforms and underwater *** failure is a critical failure mode of marine *** bending performance of the cable conductor has a major influence on both bending and fatigue performances of the overall cable *** study the influence of different types of the conductor cross-section on the bending performances of marine cable conductors,three types of copper conductors with the same cross-sectional area,i.e.,noncompressed round,compressed round,and shaped wire conductors,were *** experimental results demonstrated that the cross-section type significantly affects the bending performances of copper *** particular,the bending stiffness of the shaped wire conductor is the highest among the three conductor *** key evaluation parameters,i.e.,the bending stiffness,maximum bending moment,envelope area,and engineering critical slip point,were selected to compare and analyze the bending hysteresis curves of the three copper *** differences in the key evaluation parameters were analyzed based on the structural dimensional parameters,processing methods,and classical bending stiffness theoretical models of the three copper conductor *** results provide an important theoretical guidance for the structural design and engineering applications of marine cable conductors.

关键词： marine cable conductors cross-section type bending performance theoretical model bending test

Effect of Coarse Aggregate Size on Relationship between Stress and Crack Opening in Normal and High Strength Concretes

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Journal of Materials Science & Technology 2005年第5期21卷 85-94页

作者： Jun ZHANG Qian LIU and Lin WANGDepaxtment of Civil Engineering, Tsinghua University, Beijing 100084, China Department of Civil Engineering Tsinghua University Beijing 100084 China

Fine and coarse aggregates play an important role in the fracture of concrete. However, quantitative informationavailable on the effect of the coarse aggregate size on the fracture properties of concrete is still limited. In the presentpaper, the effect of coarse aggregate size (single grade of 5~10, 10~16, 16~20 and 20~25 mm) on stress-crackopening (σ-ω) relation in normal and high strength concretes (compressive strength of 40 and 80 MPa, respectively)was studied. The investigation was based on three-point bending tests implemented by fictitious crack analysis. Theresult shows that coarse aggregate size and cement matrix strength significantly influence the shape of σ-ω *** a given total aggregate content, in normal strength concrete, smaller size of aggregate leads to a high tensilestrength and a sharp stress drop after the peak stress. The smaller the coarse aggregate, the steeper the σ-ω *** contrast, in high strength concrete, the effect of aggregate size on σ-ω relation almost vanishes. A similar σ-ωrelation is obtained for the concrete except for the case of 20~25 mm coarse aggregate size. The stress drop afterthe peak stress is more significant for high strength concrete than that for normal strength concrete. Meanwhile, thesmaller the coarse aggregate size, the higher the flexural strength. Fracture energy and characteristic length increasewith increasing coarse aggregate size in both normal and high strength concretes.

关键词： Aggregate size Stress-crack opening relation Fracture energy bending test

Asymmetry in interface and bending property of Al/Cu/Al bimetallic laminates

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Rare Metals 2014年第5期33卷 556-562页

作者： Xiao-Bing Li Guo-Yin Zu Ping Wang School of Materials and Metallurgy Northeastern University

This work was aimed to study the interfacial microstructures and three-point bending properties of Al/Cu/Al bimetallic laminates produced by the asymmetrical roll bonding and annealing. It is found that the microstructure and bonding strength of the Al/Cu interface are different with those of the Cu/Al interface. The interfacial microstructure of Cu/Al interface is improved due to the large interfacial plastic deformation caused by the different rotation speeds of roll in the asymmetrical roll bonding process. The bonding strength between Al and Cu layer can be enhanced by the moderate atomic diffusion, but is dramatically depressed by the formation of intermetallic compounds in the *** bending strength of bimetallic laminates is enhanced when the Cu/Al interface is loaded in tension because of the improvement of stress transition and damping by the Cu/Al interface during the three-point bending deformation. The bending fracture reveals that the interfacial cracks can be inhibited from the restricted stress concentration in the improved Cu/Al interface.

关键词： Layered structures bending test Interface Shear deformation

Nodes Effect on the bending Performance of Laminated Bamboo Lumber Unit

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Journal of Renewable Materials 2021年第6期9卷 1143-1156页

作者： Yiwei Xuan Haitao Li Zhemin Bei Zhenhua Xiong Rodolfo Lorenzo Ileana Corbi Ottavia Corbi College of Civil Engineering Nanjing Forestry UniversityNanjing210037China Ganzhou Sentai Bamboo Company Ltd. Ganzhou341001China University of Melbourne Melbourne3010Australia University College London LondonWC1E 6BTUK University of Naples Federico II Naples80133Italy

This research studied the ultimate bearing capacity of laminated bamboo lumber(LBL)unit and thereby calculated the maximum bending *** load-displacement chart for all specimens was *** the flexural capacity of members with and without bamboo nodes in the middle section was *** bending experiment phenomenon of LBL unit was *** failure modes of bending components were analysed and ***,the bending behaviour of LBL units is coMPared with other bamboo and timber *** is shown that the average ultimate load of BS members is 866.1 N,the average flexural strength is 101 MPa,the average modulus of elasticity is 8.3 GPa,and the average maximum displacement is 17.02 *** average ultimate load of BNS members is 1008.1 N,the average flexural strength is 118.02 MPa,the average modulus of elasticity is 9.9 GPa,and the average maximum displacement is 18.26 *** bamboo lumber(LBL)unit without bamboo nodes(BNS)has relatively higher flexural strength coMPared with LBL unit with bamboo nodes(BS).The presence of bamboo nodes reduces the strength of the entire *** failure modes were concluded for BS members,and two failure modes were observed for BNS members during the experimental *** to a coMParison between the LBL unit and other products,the flexural strength and bending modulus of elasticity of the LBL unit are similar as bamboo scrimber and raw bamboo components,which is much higher than timber components.

关键词： Laminated Bamboo Lumber bending test flexural strength bamboo node

bending Properties and Fracture Behavior of Ti-23Al-17Nb Alloy Laser Beam Welding Joints

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Tsinghua Science and Technology 2009年第3期14卷 293-299页

作者：王国庆吴爱萍邹贵生赵玥陈强任家烈 Key Laboratory for Advanced Materials Processing Technology of the Ministry of Education Department of Mechanical Engineering Tsinghua UniversityBeijing 100084 China

Ti-23Al-17Nb alloy is an important high temperature structural material used in the space and aerospace fields. Welding of this alloy is an indispensable processing method, so the microstructures and mechanical properties of these welded joints must be studied to improve the welds. Longitudinal three-point bending tests were conducted to measure the bending ductility of laser beam welded joints. The crack distribution and fracture surface were investigated to further analyze the fracture behavior. The results indicate that the bending ductility decreases as the heat input by the laser beam welding increases. The crack inducing strain reaches 4.24%, while the fracturing strain exceeds 5% when the heat input is below 316 J/cm. If the columnar crystal grain of the weld metal exhibits a uniform orientation, the bending ductility is worse. The fractography analysis shows that the cracking propagates transgranularly and the fracture surface has a cleavage mode.

关键词： Ti3Al alloy bending test fracture behavior laser beam welding joint

MECHANICAL PROPERTIES AND SIZE EFFECTS OF SINGLE CRYSTAL SILICON

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Chinese Journal of Mechanical Engineering 2006年第2期19卷 290-293页

作者： HAN Guangping　 LIU Kai WANG Xiuhong School of Mechanical and Instrumental Engineering Xi＇ an University of TechnologyXi＇ an 710048 China Department of Industry Engineering Zhengzhou Institute of Aeronautical Industry ManagementZhengzhou 450015 China

Six kinds of micro bridge-beam specimens with different sizes are fabricated using photolithography technology for bending test. Beam specimens with trapezoidal section could be representatives of those with rectangle and square section, which are usually applied in MEMS. Nano indentation method used in bending test can be applied to both elastic and plastic materials. Also, some mechanical properties parameters such as the modulus of elasticity, hardness and the bending strength are obtained. The average modulus of elasticity of SCS is 170.295 0±2.485 0 GPa, showing no size effects, but the bending strength ranges from 3.24 GPa to 10.15 GPa, displaying strong size effects, and the average hardness is 9.496 7±1.753 3 GPa,in which no obvious size effects are observed.

关键词： Mechanical properties Modulus of elasticity Size effect Nano indentation bending test

Effect of Coarse Aggregate Size on and Crack Opening in Normal and Relationship between Stress High Strength Concretes

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Journal of Materials Science & Technology 2005年第5期21卷 691-700页

作者： Jun ZHANG Qian LIU Lin WANG Department of Civil Engineering Tsinghua University Beijing 100084 China

Fine and coarse aggregates play an important role in the fracture of concrete. However, quantitative information available on the effect of the coarse aggregate size on the fracture properties of concrete is still limited. In the present paper, the effect of coarse aggregate size （single grade of 5～10, 10～16, 16～20 and 20～25 mm） on stress-crack opening （σ-w） relation in normal and high strength concretes （compressive strength of 40 and 80 MPa, respectively） was studied. The investigation was based on three-point bending tests implemented by fictitious crack analysis. The result shows that coarse aggregate size and cement matrix strength significantly influence the shape of σ-w curve. For a given total aggregate content, in normal strength concrete, smaller size of aggregate leads to a high tensile strength and a sharp stress drop after the peak stress. The smaller the coarse aggregate, the steeper the σ-w curve. By contrast, in high strength concrete, the effect of aggregate size on σ-w relation almost vanishes. A similar σ-w relation is obtained for the concrete except for the case of 20～25 mm coarse aggregate size. The stress drop after the peak stress is more significant for high strength concrete than that for normal strength concrete. Meanwhile, the smaller the coarse aggregate size, the higher the flexural strength. Fracture energy and characteristic length increase with increasing coarse aggregate size in both normal and high strength concretes.

关键词： Aggregate size Stress-crack opening relation Fracture energy bending test

Structural Glass Fiber Reinforced Concrete for Slabs on Ground

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World Journal of Engineering and Technology 2014年第3期2卷 48-54页

作者： Philipp Lober Klaus Holschemacher University of Applied Sciences Institute of Concrete ConstructionLeipzigGermany

This paper aims to contribute to the classification and specification of glass fiber reinforced concrete (GFRC) and to deal with the question if structural glass fiber reinforced concrete as a special kind of glass fiber reinforced concrete is suited for use in load-bearing members. Despite excellent material properties, the use of glass fibers in a concrete matrix is carried out so far only in non- structural elements or as a modification for the prevention of shrinkage cracks. The aim of re- search at the University of Applied Sciences in Leipzig is the use of alkali-resistant macro glass fibers as concrete reinforcement in structural elements as an alternative to steel fiber reinforcement. Slabs on ground, as an example for structural members, provide a sensible application for the new material because they can be casted as load bearing and non-load bearing and are mostly made of steel fiber reinforced concrete. In the future, structural glass fiber reinforced concrete shall provide a simple and visually appealing alternative to conventional steel bar or steel fiber reinforced concrete. The glass fibers can also be used in combination with conventional reinforcing bars or mat reinforcements. Initial investigations have announced some potential.

关键词： Glass Fiber Reinforced Concrete GFRC Slab on Ground Structural Concrete bending test