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Properties and strengthening mechanism of brush plated nanoparticle reinforced composite coatings 被引量:2
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作者 DONG Shi-yun XU Bin-shi MA Shi-ning TU Wei-yi 《中国有色金属学会会刊:英文版》 CSCD 2004年第z1期182-185,共4页
Nanoparticle reinforced nickel matrix composite coatings, such as n-Al2O3/Ni, n-SiO2/Ni, n-SiC/Ni and n-TiO2/Ni, were fabricated by brush plating technique. Hardness, wear resistance and contact-fatigue resistance of ... Nanoparticle reinforced nickel matrix composite coatings, such as n-Al2O3/Ni, n-SiO2/Ni, n-SiC/Ni and n-TiO2/Ni, were fabricated by brush plating technique. Hardness, wear resistance and contact-fatigue resistance of the composite coatings were determined, and strengthening mechanism of the composite coatings was discussed. Results show that the composite coatings have superior properties to the Ni metal coating. Compared with properties of brush plated Ni metal coating, the composite coatings have hardness over 1.5 times and wear resistance capability of about 2.5 times. The strengthening mechanism of the composite coatings mainly includes fine-crystal grain effect, nanoparticle dispersion effect and dislocation effect. 展开更多
关键词 NANOPARTICLES BRUSH plated COATINGS strengthening mechanism
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Effect of Mechanical Surface Treatment on the Bonding Mechanism and Properties of Cold‑Rolled Cu/Al Clad Plate 被引量:1
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作者 Jianchao Han Hui Niu +5 位作者 Sha Li Zhongkai Ren Yi Jia Tao Wang A.I.Plokhikh Qingxue Huang 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2020年第5期212-224,共13页
In the case of valuable cold-rolled Cu/Al clad plates,billet surface treatment before rolling is a significant process that can affect the bonding efficiency and quality.While the current studies primarily focus on th... In the case of valuable cold-rolled Cu/Al clad plates,billet surface treatment before rolling is a significant process that can affect the bonding efficiency and quality.While the current studies primarily focus on the influence of rolling parameters,insufficient attention has been paid to surface treatment.In this study,the effects of mechanical surface treatment on the bonding mechanism and bonding properties of cold-rolled Cu/Al clad plates were investigated.The results showed that different mechanical surface treatments have significant effects on the surface morphology,roughness,and residual stress.In addition,the effect of surface mechanical treatment on bonding quality was also observed to be critical.When the grinding direction was consistent with the rolling direction(RD),the bonding quality of the Cu/Al clad plates was significantly improved.After surface treatment along the RD for 20 s,the Cu/Al clad plates showed the highest shear strength(78 MPa),approximately four times as high as that of the unpolished samples.Simultaneously,the peel strength of this process was also significantly higher than that achieved via the other processes.Finally,on the basis of the surface morphology,roughness,and residual stress,the effect of surface treatment on the bonding mechanism and bonding properties of Cu/Al clad plates was analyzed.This study proposes a deeper understanding of the bonding behavior and bonding mechanism for cold rolled clad plates processed via mechanical surface treatment. 展开更多
关键词 Cu/Al clad plates Cold rolling bonding Surface treatment Bonding mechanism Bonding property
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The deformation and failure mechanism of cylindrical shell and square plate with pre-formed holes under blast loading
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作者 Wei Li Peng Wang +3 位作者 Gao-peng Feng Yong-gang Lu Jun-zheng Yue Hui-min Li 《Defence Technology(防务技术)》 SCIE EI CAS CSCD 2021年第4期1143-1159,共17页
The deformation and failure mechanism of cylindrical shells and square plate with pre-formed holes under blast loading were investigated numerically by employing the Ansys 17.0 and Ls-Dyna 971.To calibrate the numeric... The deformation and failure mechanism of cylindrical shells and square plate with pre-formed holes under blast loading were investigated numerically by employing the Ansys 17.0 and Ls-Dyna 971.To calibrate the numerical model,the experiments of square plates with pre-formed circle holes were modeled and the numerical results have a good agreement with the experiment data.The calibrated numerical model was used to study the deformation and failure mechanism of cylindrical shells with pre-formed circle holes subjected to blast loading.The structure response and stress field changing process has been divided into four specific stages and the deformation mechanism has been discussed systematically.The local and global deformation curves,degree of damage,change of stress status and failure modes of cylindrical shell and square plate with pre-formed circular holes are obtained,compared and analyzed,it can be concluded as:(1)The transition of tensile stress fields is due to the geometrical characteristic of pre-formed holes and cylindrical shell with arch configuration;(2)The existence of preformed holes not only lead to the increasing of stress concentration around the holes,but also release the stress concentration during whole response process;(3)There are three and two kinds of failure modes for square plate and cylindrical shell with pre-formed holes,respectively.and the standoff distance has a key influence on the forming location of the crack initiating point and the locus of crack propagation;(4)The square plate with pre-formed holes has a better performance than cylindrical shell on blast-resistant capability at a smaller standoff distance,while the influence of pre-formed holes on the reduction of blast-resistant capability of square plate is bigger than that of cylindrical shell. 展开更多
关键词 Pre-formed holes Cylindrical shell and square plate Deformation mechanism Failure mechanism
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Effect of heat treatment on microstructure and mechanical property of Ti-steel explosive-rolling clad plate 被引量:14
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作者 江海涛 阎晓倩 +1 位作者 刘继雄 段晓鸽 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2014年第3期697-704,共8页
The effect of heat treatment on microstructure and mechanical properties of the Ti-steel explosive-rolling clad plate was elaborated by optical microscopy (OM), scanning electron microscopy (SEM), X-ray diffracti... The effect of heat treatment on microstructure and mechanical properties of the Ti-steel explosive-rolling clad plate was elaborated by optical microscopy (OM), scanning electron microscopy (SEM), X-ray diffraction (XRD), transmission electron microscopy (TEM), micro-hardness test and shear test. The composites were subjected to heat treatment at temperature of 650-950 ~C for 60 min. The results show that the heat treatment process results in a great enhancement of diffusion and microstructural transformation. The shear strength decreases as the treatment temperature increases. Heated at 850 ℃ or below, their shear strength decreases slowly as a result of the formation of TiC in the diffusion interaction layer; while at the temperature of 850 ℃ or above, the shear strength decreases obviously, which is the consequence of a large amount of Ti-Fe intermetaUics (Fe2Ti/FeTi) along with some TiC distributing continuously at diffusion reaction layer. 展开更多
关键词 Ti-steel explosive-rolling clad plate heat treatment DIFFUSION mechanical properties
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Surface quality, microstructure and mechanical properties of Cu-Sn alloy plate prepared by two-phase zone continuous casting 被引量:1
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作者 刘雪峰 罗继辉 王晓晨 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2015年第6期1901-1910,共10页
Cu-4.7%Sn (mass fraction) alloy plate was prepared by the self-developed two-phase zone continuous casting (TZCC) process. The relationship between process parameters of TZCC and surface quality of the alloy plate... Cu-4.7%Sn (mass fraction) alloy plate was prepared by the self-developed two-phase zone continuous casting (TZCC) process. The relationship between process parameters of TZCC and surface quality of the alloy plate was investigated. The microstructure and mechanical properties of the TZCC alloy plate were analyzed. The results show that Cu-4.7%Sn alloy plate with smooth surface can be obtained by means of reasonable matching the entrance temperature of two-phase zone mold and the continuous casting speed. The microstructure of the TZCC alloy is composed of grains-covered grains, small grains with self-closed grain boundaries, columnar grains and equiaxed grains. Compared with cold mold continuous casting Cu-4.7%Sn alloy plate, the room temperature tensile strength and ductility of the TZCC alloy plate are greatly improved. 展开更多
关键词 Cu-Sn alloy plate two-phase zone continuous casting surface quality grains-covered grains microstructure mechanical property
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Fracture mechanism of inclusions in thick plate center under tensile loading
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作者 Lei Hu Li-qin Zhang +2 位作者 Feng Hu Guo-hong Zhang Kuan Zheng 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2024年第5期1196-1209,共14页
Segregation of solute atoms in the center of thick plates of the tempered steel can cause an inhomogeneous structural transformation and generate micron-sized inclusions,which leads to lamellar tearing of thick plate ... Segregation of solute atoms in the center of thick plates of the tempered steel can cause an inhomogeneous structural transformation and generate micron-sized inclusions,which leads to lamellar tearing of thick plate and decreases the plasticity and toughness.The formation and fragmentation mechanisms of micron-sized inclusions,like MnS and(Nb,Ti)C,in the center of thick plates were investigated by using thermodynamic calculations,finite element simulations,and electron backscatter diffraction characterization techniques.The results show that micron-sized inclusions nucleate and grow in the liquid phase,and under tensile loading,they exhibit three fragmentation mechanisms.The local stress during the fragmentation of inclusions is lower than the critical fracture stress of adjacent grains,and phase boundaries can effectively impede crack propagation into the matrix.The existence of a low proportion of high-angle grain boundaries(58.1%)and high Kernel average misorientation value(0.534°)in the segregation band promotes inclusions fragmentation and crack propagation.The difference in crack initiation and propagation direction caused by the morphology of inclusions and physical properties,as well as different matrix arrest abilities,is the main reasons for the diversity of inclusion fragmentation. 展开更多
关键词 Thick plate INCLUSION Finite element simulation Critical fracture stress Fracture mechanism
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Improved Mechanical Properties of Textile Reinforced Concrete Thin Plate 被引量:4
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作者 尹世平 徐世烺 LI Hedong 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2013年第1期92-98,共7页
Textile reinforced concrete (TRC) is especially suitable for the thin-walled and light-weight structural elements with a high load-bearing capacity. For this thin element, the concrete cover thickness is an importan... Textile reinforced concrete (TRC) is especially suitable for the thin-walled and light-weight structural elements with a high load-bearing capacity. For this thin element, the concrete cover thickness is an important factor in affecting the mechanical and anti-crack performance. Therefore, the influences of the surface treatment of the textile and mixing polypropylene fiber into the concrete on the properties of the components with different cover thickness were experimentally studied with four-point bending tests. The experimental results show that for the components with the same cover thickness, sticking sand on epoxy resin-impregnated textile and adding short fiber into the concrete are helpful to improve their mechanical performance. The 2-3 mm cover thickness is enough to meet the anchorage requirements of the reinforcement fiber and the component has good crack pattern and mechanical behavior at this condition. Comparison between the calculated and the experimental Values of flexural capacity reveals satisfactory agreement. Finally, based on the calculation model of the crack spacing of reinforced concrete structures, the crack extension of this thin-wall component was qualitatively analyzed and the same results with the experimental were obtained. 展开更多
关键词 textile reinforced concrete thin plate cover thickness mechanical performance cracking mechanism
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Surface Ferrite Grain Refinement and Mechanical Properties of Low Carbon Steel Plates 被引量:4
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作者 FAN Jian-wen DAI Xiao-li +2 位作者 XIE Rui-ping ZHANG Wei-xu WANG Zu-bin 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2006年第4期35-39,共5页
Considering the specialities of the steel plate production, the TMCP study has been carried out with Gleeble 2000 tester to explore the possibility of fine grained ferrite in the low carbon steel plates with the chemi... Considering the specialities of the steel plate production, the TMCP study has been carried out with Gleeble 2000 tester to explore the possibility of fine grained ferrite in the low carbon steel plates with the chemical composition of C 0.13--0.18, Si 0.12-0.18, Mn 0.50-0. 65, P 0. 010-0. 025, and S 0. 005-0. 028. The plates with thickness of 8. 7 mm in which the ferrite grain size is smaller than 8μm have been produced by special de- formation process in the laboratory. Furthermore, the trial production of special plain carbon steel plates of 16-25 mm in thickness and 2 000- 2 800 mm in width with fine grained ferrite has been successfully carried out in the Shougang Steel Plate Rolling Plant. The ferrite grain size is 5.5-7μm in the surface layers and 9.5-15μm in the central layer respectively. The yield strength is 320- 360 MPa, tensile strength is 440-520 MPa and the elongation is 25%- 34 %. It is very important for the rolling plants to improve the low carbon steel plates' mechanical properties. The results show that the ferrite grains in the surface layer can be refined effectively by the appropriate rolling process, and the strength can be also increased. 展开更多
关键词 TMCP fine grained ferrite plain low carbon steel plate mechanical property
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Relationship between microstructure and mechanical properties of 5083 aluminum alloy thick plate 被引量:12
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作者 Xin-wei SHE Xian-quan JIANG +4 位作者 Pu-quan WANG Bin-bin TANG Kang CHEN Yu-jie LIU Wei-nan CAO 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2020年第7期1780-1789,共10页
The microstructure and mechanical properties of 105 mm thick 5083 aluminum alloy hot rolled plate were investigated by metallurgical microscope, scanning electron microscope and tensile testing machine, and three majo... The microstructure and mechanical properties of 105 mm thick 5083 aluminum alloy hot rolled plate were investigated by metallurgical microscope, scanning electron microscope and tensile testing machine, and three major characteristic problems in mechanical properties inhomogeneity were explained. The results show that the mechanical properties of the rolled plate are inhomogeneous along the thickness direction. From the surface to the center, the strength shows an inverted "N" shape change and the elongation presents a semi "U" shape change. Several similar structural units composed of long fibrous grains(LFG) and short fibrous grains bands(SFGB) exist in a special layer(Layer 2) adjacent to the surface. This alternating layered distribution of LFG and SFGB is conducive to improving the plasticity by dispersing the plastic deformation concentrated on the boundary line(BL) between them. However, their different deformability will cause the alternation of additional stresses during the hot rolling, leading to the strength reduction. The closer the location to the center of the plate is, the more likely the recovery rather than the recrystallization occurs. This is the possible reason for the unnegligible difference in strength near the central region(Layer 4 and Layer 5). 展开更多
关键词 aluminum alloy thick plate mechanical properties INHOMOGENEITY fibrous grains dynamic recovery dynamic recrystallization
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Microstructure and impact mechanical properties of multi-layer and multi-pass TIG welded joints of Al-Zn-Mg alloy plates 被引量:7
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作者 Qing-wei GAO Feng-yuan SHU +1 位作者 Peng HE Wen-bo DU 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2019年第12期2496-2505,共10页
The microstructure and mechanical properties of multi-layer multi-pass TIG welded joints of Al-Zn-Mg alloy plates were studied.The phase constituent and microstructure of different regions of the welded joints were ch... The microstructure and mechanical properties of multi-layer multi-pass TIG welded joints of Al-Zn-Mg alloy plates were studied.The phase constituent and microstructure of different regions of the welded joints were characterized by scanning electron microscopy(SEM),X-ray diffraction(XRD),transmission electron microscopy(TEM)and energy disperse spectrum(EDS),while the mechanical properties were evaluated according to the impact test.A dispersively distributed spherical and needle-likeη(MgZn2)phase was obtained in the welding seam.The phase composition of the heat-affected zone(HAZ)wasα(Al)+η(MgZn2)+Al6Mn,and there were a large number of dispersively precipitated nanoscale particles.The welded joint zone had the highest impact toughness as compared with the other parts of the joint.The MgZn2 phase in the weld zone contributed to the improved toughness of the joint.Al2 MgCu phase in HAZ was proven to act as a crack source during fracture. 展开更多
关键词 Al-Zn-Mg alloy thick plates multi-layer TIG welding MICROSTRUCTURE impact mechanical property
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Mechanism and Microstructure of Electroless Ni-Fe-P Plating on CNTs 被引量:7
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作者 XUE Ru-jun WU Yu-cheng 《Journal of China University of Mining and Technology》 EI 2007年第3期424-427,共4页
Electroless Ni-Fe-P alloy plating on the surface of CNTs was carded out with a bath using citrate salt and lactic acid as complex agents. We proposed a chemical reaction mechanism. The morphology, structure and chemic... Electroless Ni-Fe-P alloy plating on the surface of CNTs was carded out with a bath using citrate salt and lactic acid as complex agents. We proposed a chemical reaction mechanism. The morphology, structure and chemical composition of the Ni-Fe-P/CNTs were studied with the aid of a scanning electronic microscope (SEM), X-ray diffraction (XRD) and an energy-dispersive X-ray spectral analysis (EDS). The results show that through a correct pre-treatment and electroless plating, Ni-Fe-P/CNTs composite particles can be obtained. The optimum electroless plating parameters of 35-42℃ and pH of 8.5-9.7 were achieved. The as-plated Ni-Fe-P alloy is amorphous. After a heat treatment at 500℃ for 90 min in H2, the coating is transformed into crystalloid Ni3E Fe2NiP and (Fe,Ni)3R The Ni-Fe-P alloy coating on the surface of CNTs is smooth and unique. The amount of Ni on the surface (mass fraction) of the Ni-Fe-P/CNTs composite particles is 29.13%, that of Fe 3.19% and that of P 2.28%. 展开更多
关键词 carbon nanotubes Ni-Fe-P alloy eletroless plating mechanism structure
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Experimental Study on the Flow Characteristics of a Plate with a Mechanically Choked Orifice 被引量:4
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作者 Ming Liu Xingkai Zhang Dong Wang 《Fluid Dynamics & Materials Processing》 EI 2021年第1期97-107,共11页
The mechanically choked orifice plate (MCOP) is a new type of device for flow control by which choking conditionsfor incompressible fluids can be obtained with relatively small pressure losses. Given the lack of relev... The mechanically choked orifice plate (MCOP) is a new type of device for flow control by which choking conditionsfor incompressible fluids can be obtained with relatively small pressure losses. Given the lack of relevant results anddata in the literature, in the present study, we concentrate on the experimental determination of the flow coefficientfor the annular orifice, the pressure distribution in the MCOP, and the characteristics of the choked flow itself. Asconfirmed by the experimental results, the Reynolds number, the orifice plate thickness, the plug taper, and theeccentricity have an obvious influence on the aforementioned flow coefficient. The pressure drop in the MCOPis mainly generated near the orifice plate, and the pressure upstream of the orifice plate is slightly reduced in theflow direction, while the pressure downstream of the orifice plate displays a recovery trend. The choked flow rateof the MCOP can be adjusted by replacing the spring with a maximum flow control deviation of 4.91%. 展开更多
关键词 mechanical choked orifice plate flow control flow coefficient flow characteristics
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NUMERICAL INVESTIGATION OF STRAIGHT-LINE LASER FORMING UNDER THE TEMPERATURE GRADIENT MECHANISM 被引量:1
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作者 Y.J. Shi H. Shen Z.Q. Yao J. Hu 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 2006年第2期144-150,共7页
Laser forraing is a new flexible and dieless forming technique. To achieve the high accuracy forming, the temperature gradient mechanism (TGM) is studied. In the analysis of TGM, the plate bends about x-axis and abo... Laser forraing is a new flexible and dieless forming technique. To achieve the high accuracy forming, the temperature gradient mechanism (TGM) is studied. In the analysis of TGM, the plate bends about x-axis and about y-axis as well. To understand the deformation trend, the numerical simulation of deformation of plate is conducted by choosing different laser powers, laser spot diameters, scanning speeds, lengths, widths and thicknesses. From the results of simulation, it can be seen that the laser spot diameter, the scanning speed, laser power and thickness of plate play dominant roles in the laser forming process. However, the bending angles αx and αy show different trends with the variation of parameters. In addition, in comparison with above four parameters, the effect of length and width of plate on the beading angle may be neglected, but their effects are significant for the bending radius R. 展开更多
关键词 laser forming temperature gradient mechanism metal plate
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Focal mechanism and modern stress field along the Burmese Arc and its vicinity 被引量:1
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作者 李鸿吉 秦建业 《Acta Seismologica Sinica(English Edition)》 CSCD 1994年第4期577-585,共9页
It is generally accepted that the Burmese Arc represents a transition zone between the Himalayan collision belt and the Indonesian Arc. The detail analysis of focal mechanism in the Burmese Arc and its vicinity now im... It is generally accepted that the Burmese Arc represents a transition zone between the Himalayan collision belt and the Indonesian Arc. The detail analysis of focal mechanism in the Burmese Arc and its vicinity now implicates two dominant factors responsible for the prevailing stress field in the region. The first is the Indian Plate motion, which produces a SSW-NNE compressive stressl the second is the overthrusting of the Eurasian Plate above the indian Plate, which results in a NEE-SWW compressive stress and a tensile stress approximately perpendicular to the main tectonic lines. The flow of material from the deep crust of Tibet to Burmese region facilitates the overthrusting. The two share a common dynamic source, namely, the NNE motion of the Indian Plate. 展开更多
关键词 focal mechanism modern stress field Burmese Arc Indian plate
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The evolution and failure mechanism of lithium metal anode under practical working conditions 被引量:2
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作者 Jia Liu Hong Yuan 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2020年第9期424-425,I0012,共3页
Lithium(Li)metal is regarded as a promising anode material to render the Li batteries with high energy density and therefore satisfy the ever-growing energy demands of high-end storage devices[1].Unfortunately,the den... Lithium(Li)metal is regarded as a promising anode material to render the Li batteries with high energy density and therefore satisfy the ever-growing energy demands of high-end storage devices[1].Unfortunately,the dendrite growth accompanied with accumulation of"dead Li"leads to low Coulombic efficiency,poor cycling lifespan,and even severe safety hazards,critically hindering the practical implementation of Li metal batteries[2,3]. 展开更多
关键词 Practical lithium metal anode Electrochemical diagram Failure mechanism Plating/stripping behavior
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Microstructure and mechanical properties of a high strength and high corrosion resistance roll-bonded clad checkered plate 被引量:1
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作者 YAN Bo HAO Yingmin +1 位作者 XIA Xiaoming JIAO Sihai 《Baosteel Technical Research》 CAS 2017年第1期26-31,共6页
The checkered plate,also known as the floor/pattern plate ,has a raised pattern that provides excellent skid resistance for a wide range of applications. As one of most commonly used products, the carbon steel checker... The checkered plate,also known as the floor/pattern plate ,has a raised pattern that provides excellent skid resistance for a wide range of applications. As one of most commonly used products, the carbon steel checkered plate requires a high-cost coating for corrosion resistance. Although the austenitic stainless steel checkered plate meets corrosion resistance requirements ,it does not necessarily provide high overall performance due to its low yield strength, which means greater thickness and weight. Combining the advantages of stainless and carbon structural steel, Baosteel has developed a new roll-bonded clad checkered plate that exhibits high performance in skid resistance, strength, and corrosion resistance. Metallographic analysis shows the cladding interfaces to be very good, with stainless steel filling the whole pattern and a uniform microstructure in the different cladding layers. The yield strength and tensile strength of the product are 470 MPa and 610 MPa, respectively. In addition,the fracture morphology exhibits excellent interfacial bonding properties. We performed external and internal bend tests at room temperature, 180°, and 0.7a without the development of any cracks, which indicates its excellent formability. 展开更多
关键词 clad rolling roll-bonded clad checked plate microstructure mechanical properties
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Thermodynamic Consistency of Plate and Shell Mathematical Models in the Context of Classical and Non-Classical Continuum Mechanics and a Thermodynamically Consistent New Thermoelastic Formulation 被引量:3
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作者 Karan S. Surana Sri Sai Charan Mathi 《American Journal of Computational Mathematics》 2020年第2期167-220,共54页
Inclusion of dissipation and memory mechanisms, non-classical elasticity and thermal effects in the currently used plate/shell mathematical models require that we establish if these mathematical models can be derived ... Inclusion of dissipation and memory mechanisms, non-classical elasticity and thermal effects in the currently used plate/shell mathematical models require that we establish if these mathematical models can be derived using the conservation and balance laws of continuum mechanics in conjunction with the corresponding kinematic assumptions. This is referred to as thermodynamic consistency of the mathematical models. Thermodynamic consistency ensures thermodynamic equilibrium during the evolution of the deformation. When the mathematical models are thermodynamically consistent, the second law of thermodynamics facilitates consistent derivations of constitutive theories in the presence of dissipation and memory mechanisms. This is the main motivation for the work presented in this paper. In the currently used mathematical models for plates/shells based on the assumed kinematic relations, energy functional is constructed over the volume consisting of kinetic energy, strain energy and the potential energy of the loads. The Euler’s equations derived from the first variation of the energy functional for arbitrary length when set to zero yield the mathematical model(s) for the deforming plates/shells. Alternatively, principle of virtual work can also be used to derive the same mathematical model(s). For linear elastic reversible deformation physics with small deformation and small strain, these two approaches, based on energy functional and the principle of virtual work, yield the same mathematical models. These mathematical models hold for reversible mechanical deformation. In this paper, we examine whether the currently used plate/shell mathematical models with the corresponding kinematic assumptions can be derived using the conservation and balance laws of classical or non-classical continuum mechanics. The mathematical models based on Kirchhoff hypothesis (classical plate theory, CPT) and first order shear deformation theory (FSDT) that are representative of most mathematical models for plates/shells are investigated in this paper for their thermodynamic consistency. This is followed by the details of a general and higher order thermodynamically consistent plate/shell thermoelastic mathematical model that is free of a priori consideration of kinematic assumptions and remains valid for very thin as well as thick plates/shells with comprehensive nonlinear constitutive theories based on integrity. Model problem studies are presented for small deformation behavior of linear elastic plates in the absence of thermal effects and the results are compared with CPT and FSDT mathematical models. 展开更多
关键词 plate and Shell Mathematical Models Energy Functional Thermodynamic Consistency Classical Continuum mechanics Non-Classical Continuum mechanics Internal Rotations Cosserat Rotations Principle of Virtual Work
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Mechanical and Acoustic Performance Test of New Designed Metal Noise Barrier Unit Plate with No Riveted Connection 被引量:1
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作者 LUAN Haoxiang WU Jin +3 位作者 PAN Jiayu ZHU Wanxu ZHOU Hongmei PENG Hanze 《Transactions of Nanjing University of Aeronautics and Astronautics》 EI CSCD 2020年第2期343-352,共10页
The modern transportation system is increasingly developed during recent years.It is an effective solution to set the noise barriers to reduce the traffic noise pollution caused by different kinds of transportation sy... The modern transportation system is increasingly developed during recent years.It is an effective solution to set the noise barriers to reduce the traffic noise pollution caused by different kinds of transportation systems.Many deficiencies on concrete noise barriers and metal noise barriers with rivet structure can be eliminated by a new kind of noise barrier with no-riveted structure.The mechanical performance examination and acoustic performance test are conducted on the new-designed noise barrier with no-riveted structure.The results indicate that the maximum stress is 1.74 MPa and the maximum deformation is 1.04 mm with load acting on the unit plate.The noise reduction coefficient of this kind of no-riveted noise barrier unit plate is 0.75 and its noise insulation is 40 dB,which were conform to or superior to the standard requirements.Therefore,this new designed noise barrier meets the field application requirements of mechanical and acoustic performance,which demonstrates the noise barriers can be widely promoted. 展开更多
关键词 noise barrier unit plate no-riveted connection structure design mechanical performance acoustic performance
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Mechanical Behavior of Light Trusses Made of Poplar Laminated Veneer Lumber and Connected with Bolts and Tooth Plates 被引量:1
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作者 Yan Liu Yanfei Guo +1 位作者 Xufeng Sun Meng Gong 《Journal of Renewable Materials》 SCIE EI 2020年第9期1111-1127,共17页
Poplar Laminated Veneer Lumber(Poplar LVL)is a new type of engineering materials with high strength,good reliability and small variability.Poplar LVL is manufactured from the fast-growing poplar,which is widely used i... Poplar Laminated Veneer Lumber(Poplar LVL)is a new type of engineering materials with high strength,good reliability and small variability.Poplar LVL is manufactured from the fast-growing poplar,which is widely used in packaging,furniture and others,however,is rarely adopted in construction.In order to explore the feasibility of poplar LVL trusses in construction of roof,four 4.5-m-span Fink-and-Howe trusses were designed and assembled,which were made of poplar LVL with bolted-and tooth-plated connections.Vertical static loading on the upper chord joints of a truss was imposed by self-balancing test device.The mechanical properties of trusses were examined.The ultimate load,deformation character and failure mode of each truss were measured,observed and analyzed.Furthermore,four types of analytical models with different joint connection assumptions were used to estimate the ultimate load and deflection.The results showed that the poplar LVL trusses were basically in elastic stage before the design load was reached,showing good working performance under the action of design load.The bearing capacity of the trusses of bolted connections was greater than that of the tooth-plated connections.As for the same joint connection type,the bearing capacity of Fink trusses exceeded that of Howe trusses.The poplar LVL light trusses of both types of connections showed good structural performance,which could be reasonably used for building roof systems. 展开更多
关键词 Poplar LVL TRUSS mechanical properties bearing capacity bolted connection truss plate connections model
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Mechanical Properties of Moso Bamboo Connections with External Clamp Steel Plates 被引量:1
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作者 Shidong Nie Song Ran +3 位作者 Di Wu Jieyu Chen Hui Wang Qike Wei 《Journal of Renewable Materials》 SCIE EI 2022年第2期487-510,共24页
The Moso bamboo,a renewable green building material used in various new green buildings,have received exten-sive attention with the promotion of the concept of green buildings.To explore the mechanical properties of M... The Moso bamboo,a renewable green building material used in various new green buildings,have received exten-sive attention with the promotion of the concept of green buildings.To explore the mechanical properties of Moso bamboo connections with external clamp steel plates,the 16 specimens were designed by changing the bolt diameters and the end distances of the bolt holes.Their static tension tests were conducted to investigate bearing capacities and failure modes of different connection configurations.Based on test results,three failure modes of these connections were obtained,including the shear failure of bolt shank,bearing failure of bolt hole and punch-ing shear failure of the Moso bamboo.The influence of bolt diameters and end distances of bolt holes on bearing capacities of the connections was quantitatively analyzed.Based on a simplified mechanical model,the analytical models were deduced for the bolt shear failure and the bearing failure of bolt holes.The results showed that the predictive values are in substantial agreement with the experimental results.Finally,the design and manufacturing suggestions are recommended for this Moso bamboo connections. 展开更多
关键词 Moso bamboo connections external clamp steel plates load-carrying capacities failure modes the 5%d offset method mechanical model
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