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Failure Characteristics of Rock-like Mortar Specimens with Arc-shaped Flaws under Freezing-thaw Cycles and Uniaxial Compression
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作者 LI Yong LI Kunpeng +4 位作者 ZHANG Shaowang YIN Futong WANG Chen DAI Feng WANG Kai 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS CSCD 2024年第6期1461-1473,共13页
To investigate the freeze-thaw(F-T)damages and failure characteristics of rock mass with arc-shaped joints in cold regions,three types of cement mortar specimens with different central angles and prefabricated arc-sha... To investigate the freeze-thaw(F-T)damages and failure characteristics of rock mass with arc-shaped joints in cold regions,three types of cement mortar specimens with different central angles and prefabricated arc-shaped flaws are subjected to uniaxial compressive tests under different F-T cycles.Experimental observations show that the uniaxial compressive strength of specimens are significantly influenced by F-T cycles and their failure modes are mainly affected by the central angleαof the prefabricated flaws.Unlike the specimens with a central angle of 60°,the specimens with a central angle of 120°and 180°have greater curvature of flaws,so tensile cracks occur in the arc-top area of their prefabricated flaws.According to experimental images observed by environmental scanning electron microscope(ESEM),as the number of F-T cycles increases,the deterioration effect of the specimen becomes more obvious,which is specifically reflected in the increase of the mass loss,peak stress loss,and damage variables as a power function,and the peak strain decreases as a quadratic polynomial.According to numerical results using two-dimensional particle flow code(PFC2D),it is found that F-T cycles cause more damage to the specimen in the early stages than in the later ones.The area of the concentrated compressive stress zone in the middle is decreased due to the increased number of F-T cycles,while the area of the surrounding tensile-shear stress zone is increased.The models appear different failure modes due to the release of concentrated stress in different tensile-shear zones. 展开更多
关键词 cement mortar material arc-shaped flaws freeze-thaw cycle failure pattern PFC2D
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The Origins of the Arc-Shaped Langshan Uplift and Linhe Trench
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作者 Yi Ding Yunxia Wu Zheng Hou 《Open Journal of Geology》 CAS 2024年第1期117-125,共9页
In the northern part of the Ordos Basin, there is a 325 km long arc-shaped Langshan uplift and a 15 km-deep Linhe Trench in front of Langshan, which are rare geological phenomena for which origins no one has explained... In the northern part of the Ordos Basin, there is a 325 km long arc-shaped Langshan uplift and a 15 km-deep Linhe Trench in front of Langshan, which are rare geological phenomena for which origins no one has explained. This article comprehensively analyzes the research achievements over the past 40 years of geology, geomorphology, seismic exploration, paleogeography, and oil and gas exploration in the Ordos Basin and Langshan. It recognizes that the northern part of the Ordos Basin experienced a meteorite impact in the Late Cretaceous period. The impact pushed the block northwest ward, subducting after colliding with igneous rocks in the north. This sudden event formed a clear arc-shaped mountain zone in the north and a wedge-shaped trench in front of the mountain. The chaotic layers, prolonged and continuous faults, and numerous thrust layers in the Langshan, a negative anomaly area in the center of the northern Ordos, abnormal orientation of crystalline basement structures in the north of Ordos, Moho uplift, and distribution of meteorite fragments in the northwest of Langshan, all of these geological phenomena support the occurrence of the meteorite impact event, forming the arc-shaped Langshan and the Trench. 展开更多
关键词 Meteorite Craters Linhe ORDOS arc-shaped Langshan TRENCH
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Wave Diffraction on Arc-Shaped Floating Perforated Breakwaters 被引量:7
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作者 段金辉 程建生 +1 位作者 王建平 王景全 《China Ocean Engineering》 SCIE EI 2012年第2期305-316,共12页
An analytical method is developed to study the sheltering effects on arc-shaped floating perforated breakwaters. In the process of analysis, the tloating breakwater is assumed to be rigid, thin, vertical, and immovabl... An analytical method is developed to study the sheltering effects on arc-shaped floating perforated breakwaters. In the process of analysis, the tloating breakwater is assumed to be rigid, thin, vertical, and immovable and located in water with constant depth. The fluid domain is divided into two regions by imaginary interface. The velocity potential in each region is expanded by eigenfunction in the context of linear theory. By satisfying continuity of pressure and normal velocity across the imaginary fluid interface, a set of linear algebraic equations can be obtained to determine the unknown coefficients for eigenfunction expansions. The accuracy of the present model was verified by a comparison with existing results for the case of arc-shaped floating breakwater. Numerical results, in the form of contour maps of the non-dimensional wave amplitude around the breakwater and diffracted wave amplitude at typical sections, are presented for a range of wave and breakwater parameters. Results show that the sheltering effects on the arc-shaped floating perforated breakwater are closely related to the incident wavelength, the draft and the porosity of the breakwater. 展开更多
关键词 arc-shaped floating perforated breakwater wave diffraction EIGENFUNCTION porosity
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Numerical simulations of rip currents off arc-shaped coastlines 被引量:5
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作者 WANG Hong ZHU Shouxian +2 位作者 LI Xunqiang ZHANG Wenjing NIE Yu 《Acta Oceanologica Sinica》 SCIE CAS CSCD 2018年第3期21-30,共10页
The rip currents induced by waves off arc-shaped coastlines are seriously harmful to humans, but understanding of their characteristics is lacking. In this study, the FUNWAVE model was used to calculate the wave-induc... The rip currents induced by waves off arc-shaped coastlines are seriously harmful to humans, but understanding of their characteristics is lacking. In this study, the FUNWAVE model was used to calculate the wave-induced currents in the Haller experiment and the ideal arc-shaped coast similar to Sanya Dadonghai, Hainan Province,China. The results showed that the FUNWAVE model has considerable ability to simulate the rip currents, and it was used to further simulate rip currents off arc-shaped coastlines to investigate their characteristics. The rip currents were found to be stronger as the curvature of arc-shaped coastline increased. Coastal beach slope exerts a significant influence on rip currents; in particular, an overly steep or overly mild slope is not conducive to creating rip currents. Furthermore, the rip currents were found to become weaker as the size of arc-shaped coast decreased. When the height and period of waves increase, the strength of rip currents also increases, and, in some cases, wave heights of 0.4 m may produce dangerous rip currents. 展开更多
关键词 rip current arc-shaped coastline FUNWAVE model numerical simulation
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Study on Submerged Upper Arc-Shaped Plate Type Breakwater 被引量:3
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作者 WANG Ke SHI Peng-fei +1 位作者 CHEN Yu-chao CHENG Xiao-ming 《China Ocean Engineering》 SCIE EI CSCD 2019年第2期219-225,共7页
Based on the wave radiation and diffraction theory, this paper investigates a new type breakwater with upper arcshaped plate by using the boundary element method(BEM). By comparing with other three designs of plate ty... Based on the wave radiation and diffraction theory, this paper investigates a new type breakwater with upper arcshaped plate by using the boundary element method(BEM). By comparing with other three designs of plate type breakwater(lower arc-shaped plate, single horizontal plate and double horizontal plate), this new type breakwater has been proved more effective. The wave exiting force, transmission and reflection coefficients are analyzed and discussed. In order to reveal the wave elimination mechanism of this type of breakwater, the velocity field around the breakwater is obtained. It is shown that:(1) The sway exciting force is minimal.(2) When the ratio of the submergence and wave amplitude is 0.05, the wave elimination effect will increase by 50% compared with other three types of breakwater.(3) The obvious backflow is found above the plate in the velocity field analysis. 展开更多
关键词 UPPER arc-shaped plate type BREAKWATER boundary element method transmission and reflection coefficient velocity field analysis
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Plastic Mechanism of Multi-pass Double-roller Clamping Spinning for Arc-shaped Surface Flange 被引量:3
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作者 FAN Shuqin ZHAO Shengdun +1 位作者 ZHANG Qi LI Yongyi 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2013年第6期1127-1137,共11页
Compared with the conventional single-roller spinning process, the double-roller clamping spinning(DRCS) process can effectively prevent the sheet metal surface wrinkling and improve the the production efficiency an... Compared with the conventional single-roller spinning process, the double-roller clamping spinning(DRCS) process can effectively prevent the sheet metal surface wrinkling and improve the the production efficiency and the shape precision of final spun part. Based on ABAQUS/Explicit nonlinear finite element software, the finite element model of the multi-pass DRCS for the sheet metal is established, and the material model, the contact definition, the mesh generation, the loading trajectory and other key technical problems are solved. The simulations on the multi-pass DRCS of the ordinary Q235A steel cylindrical part with the arc-shaped surface flange are carried out. The effects of number of spinning passes on the production efficiency, the spinning moment, the shape error of the workpiece, and the wall thickness distribution of the final part are obtained. It is indicated definitely that with the increase of the number of spinning passes the geometrical precision of the spun part increases while the production efficiency reduces. Moreover, the variations of the spinning forces and the distributions of the stresses, strains, wall thickness during the multi-pass DRCS process are revealed. It is indicated that during the DRCS process the radical force is the largest, and the whole deformation area shows the tangential tensile strain and the radial compressive strain, while the thickness strain changes along the generatrix directions from the compressive strain on the outer edge of the flange to the tensile strain on the inner edge of the flange. Based on the G-CNC6135 NC lathe, the three-axis linkage computer-controlled experimental device for DRCS which is driven by the AC servo motor is developed. And then using the experimental device, the Q235A cylindrical parts with the arc-shape surface flange are formed by the DRCS. The simulation results of spun parts have good consistency with the experimental results, which verifies the feasibility of DRCS process and the reliability of the finite element model for DRCS. 展开更多
关键词 SPINNING double-roller clamping MULTI-PASS arc-shaped surface
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Coastline configuration and geomorphologic development mode of arc-shaped coast in South China 被引量:2
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作者 戴志军 李春初 《Journal of Geographical Sciences》 SCIE CSCD 2004年第4期473-480,共8页
Coastline configuration indexes of 34 typical arc-shaped coasts in South China are investigated by the method of principal component analysis, and meanwhile deposition and geomorphologic features of arc-shaped coast a... Coastline configuration indexes of 34 typical arc-shaped coasts in South China are investigated by the method of principal component analysis, and meanwhile deposition and geomorphologic features of arc-shaped coast are also analyzed. The results show: (1) The configuration of arc-shaped coast in South China is of the characteristic of variability and complexity. (2) The wave power and the openings of the bay are the decisive factors to result in the changes of the configuration of the arc-shaped coast in South China, however, incidence direction of the wave has no effect on configuration development of the coast. (3) Commonly, geomorphologic modes of the arc-shaped coast system in South China consist of barriers, lagoons and tidal-inlets, and can be divided into four types:the openings of the bay leaning to the east, the openings of the bay leaning to the south, the openings of the bay leaning to the west and the openings of the bay leaning to the north. 展开更多
关键词 coastline configuration geomorphologic mode arc-shaped coast south China principal component analysis
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Numerical simulations of stress wave propagation and attenuation at arc-shaped interface inlayered SiC/Al composite 被引量:1
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作者 孙明燕 张朝晖 +2 位作者 杨瑞 王富耻 李树奎 《Journal of Beijing Institute of Technology》 EI CAS 2013年第4期557-562,共6页
The effects of interface shape on stress wave distribution and attenuation were investiga- ted using finite element method ( FEM ). The simulation results indicate that when the stress wave propagates from SiC ceram... The effects of interface shape on stress wave distribution and attenuation were investiga- ted using finite element method ( FEM ). The simulation results indicate that when the stress wave propagates from SiC ceramic to A1 alloy, the tensile stress decreases and the attenuation coefficient of the stress wave increases with increasing central angle of the concave interface between SiC and A1. But for the convex interface, the tensile stress increases and attenuation coefficient decreases with increasing central angle. As the stress wave propagates from A1 alloy to SiC ceramic, the atten- uation coefficient of stress wave decreases with increasing the central angle of the concave interface. For the convex interface, the attenuation coefficient increases with increasing central angle. 展开更多
关键词 SiC/A1 composite arc-shaped interface stress wave attenuation numerical simula-tion
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Hydrodynamic Performance of the Arc-Shaped Bottom-Mounted Breakwater 被引量:1
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作者 楚玉川 程建生 +2 位作者 王景全 李志刚 江克斌 《China Ocean Engineering》 SCIE EI CSCD 2014年第6期749-760,共12页
The problem of the hydrodynamic interaction with the arc-shaped bottom-mounted breakwaters is investigated theoretically. The breakwater is assumed to be rigid, thin, impermeable and vertically located in a finite wat... The problem of the hydrodynamic interaction with the arc-shaped bottom-mounted breakwaters is investigated theoretically. The breakwater is assumed to be rigid, thin, impermeable and vertically located in a finite water depth. The fluid domain is divided into two sub-regions of inner and outer by an auxiliary circular interface. Linear theory is assumed and the eigenfunction expansion approach is used to determine the wave field. In order to examine the validity of the theoretical model, the analytical solutions are compared to agree well with published results with the same parameters. Numerical results including wave amplitude, surge pressure, and wave force are presented with different model parameters. The major factors including wave parameters, structure configuration, and water depth that affect the surge pressure, wave forces, and wave amplitudes are discussed and illustrated by some graphs and cloud maps. 展开更多
关键词 arc-shaped wave diffraction hydrodynamic performance oblique incidence
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Determination of Wind Pressure Coefficients for Arc-Shaped Canopy Roof with Numerical Wind Tunnel Method
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作者 尹越 张天舒 +1 位作者 韩庆华 杨惠东 《Transactions of Tianjin University》 EI CAS 2009年第5期360-365,共6页
In this paper,the wind load on an arc-shaped canopy roof was studied with numerical wind tunnel method(NWTM) .Three-dimensional models were set up for the canopy roof with opened or closed skylights.The air flow aroun... In this paper,the wind load on an arc-shaped canopy roof was studied with numerical wind tunnel method(NWTM) .Three-dimensional models were set up for the canopy roof with opened or closed skylights.The air flow around the roof under wind action from three directions was analysed respectively.Wind pressure coefficients on the canopy roof were determined by NWTM.The results of NWTM agreed well with those of wind tunnel test for the roof with opened skylights,which verified the applicability and rationality of NWTM.The effect of the closure of skylights was then investigated with NWTM.It was concluded that the closure of the skylights may increase the wind suction on the top surface of the roof greatly and should be considered in the structure design of the canopy roof. 展开更多
关键词 arc-shaped canopy roof numerical wind tunnel method wind pressure coefficient wind tunnel test skylights
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A DECAGONAL QUASICRYSTAL WITH AN ARC-SHAPED CRACK
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作者 Wang Xu Zhong Zheng 《Acta Mechanica Solida Sinica》 SCIE EI 2003年第1期8-15,共8页
A decagonal quasicrystal, which is weakened by an arc-shaped crackpenetrating through the solid in the period direction, and which is subjected to remote uniformphonon stresses, is investigated by applying the complex... A decagonal quasicrystal, which is weakened by an arc-shaped crackpenetrating through the solid in the period direction, and which is subjected to remote uniformphonon stresses, is investigated by applying the complex variable method which is just developed bythe authors. It is found that the phonon and phason stresses near the crack tips exhibit inversesquare root singularities. The four complex stress functions characterizing the phonon and phasonfields are derived. Explicit expressions for the phonon and phason stress intensity factors, crackopening displacements and energy release rate are also presented. 展开更多
关键词 decagonal quasicrystal arc-shaped crack stress intensity factor energyrelease rate
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Compressive properties of a novel slurry-infiltrated fiber concrete reinforced with arc-shaped steel fibers 被引量:1
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作者 Hedong LI Yabiao LI +3 位作者 Yunfeng PAN P.L.NG Christopher K.Y.LEUNG Xin ZHAO 《Journal of Zhejiang University-Science A(Applied Physics & Engineering)》 SCIE EI CAS CSCD 2023年第6期543-556,共14页
Slurry-infiltrated fiber concrete(SIFCON)is a sort of strain hardening cement-based composite material,typically made with 5%–20%steel fibers.This study focused on a novel type of SIFCON in which hooked-end steel fib... Slurry-infiltrated fiber concrete(SIFCON)is a sort of strain hardening cement-based composite material,typically made with 5%–20%steel fibers.This study focused on a novel type of SIFCON in which hooked-end steel fibers were replaced by arc-shaped steel fibers.The quasi-static compressive properties of the SIFCON were first measured.Test results suggested that using arc-shaped steel fibers in lieu of hooked-end steel fibers increased the quasi-static compressive strength by 47.1%and the strain at peak stress by 56.3%.We attribute these improvements to new crack-resisting mechanisms,namely“fiber crosslock”,“dual bridging”,and“confinement loops”,when the arc-shaped steel fibers are introduced into SIFCON.As high impact resistance is a special property of SIFCON that is of practical significance,the dynamic compressive properties of arc-shaped steel fiber SIFCON were studied by using an 80-mm-diameter split Hopkinson pressure bar(SHPB).The results showed that the dynamic compressive strength,dynamic increase factor(DIF),and dynamic toughness of SIFCON all increased with the strain rate.The SIFCON incorporating arc-shaped steel fibers proved to have significant advantages in structural applications requiring high impact resistance. 展开更多
关键词 Slurry-infiltrated fiber concrete(SIFCON) arc-shaped steel fiber Quasi-static compressive properties Spilt Hopkinson pressure bar(SHPB) Dynamic compressive properties
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Response characteristics of beach morphologies in an arc-shaped coast to typhoon waves 被引量:4
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作者 陈子燊 《Chinese Science Bulletin》 SCIE EI CAS 1996年第12期1015-1019,共5页
High waves and storm surges caused by typhoon(or storm)are the disaster eventsfor the serious erosion in coasts,to which scientists have paid close attention.However,there have been little report on the response proce... High waves and storm surges caused by typhoon(or storm)are the disaster eventsfor the serious erosion in coasts,to which scientists have paid close attention.However,there have been little report on the response processes of the beach morphologiesin different sections of the arc-shaped coast to such calamities.A sequence of beachchanges that were measured in the field during the Typhoon 8616 at the arc-shaped coastof the Shuidong in Guangdong Province,South China is analyzed in this note. 展开更多
关键词 arc-shaped COAST BEACH erosion and deposition BEACH morphology states typhoon wave.
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WAVE DIFFRACTION ON ARC-SHAPED BOTTOM-MOUNTED BREAKWATERS 被引量:5
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作者 MIAO Guo-ping CHENG Jian-sheng +1 位作者 WANG Jing-quan YOU Yun-xiang 《Journal of Hydrodynamics》 SCIE EI CSCD 2005年第4期391-397,共7页
An analytical method was developed to study the wave diffraction effects on arc-shaped bottom-mounted breakwaters. The breakwater was assumed to be rigid, thin, impermeable and vertically located in water of constant ... An analytical method was developed to study the wave diffraction effects on arc-shaped bottom-mounted breakwaters. The breakwater was assumed to be rigid, thin, impermeable and vertically located in water of constant depth. The fluid domain was divided into two regions by imaginary cylindrical interface. The velocity potential in each region was expanded with cigcnfunctions. By satisfying continuity of pressure and normal velocity across the imaginary fluid interface, a set of linear algebraic equations could be obtained to determine the unknown coefficients for eigenfunction expansions. The accuracy of the present model was verified by a comparison with existing results for the case of an isolated straight-line breakwater. Numerical results, in the form of contour maps of the non-dimensional wave amplitude around the breakwater and diffracted wave amplitude at three typical sections, were presented for a range of wave parameters. Results show the arc-shaped bottom-mounted breakwater is generally effective in defending against waves. The wave amplitudes at most sheltered areas are commonly 10%-50% of incident wave amplitudes under most wave conditions. 展开更多
关键词 arc-shaped breakwater wave diffraction velocity potential EIGENFUNCTION
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Hydrodynamic performance of combined cylinders structure with dual arc-shaped porous outer walls 被引量:3
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作者 LIN Gao LIU Jun 《Science China(Physics,Mechanics & Astronomy)》 SCIE EI CAS 2012年第11期1963-1977,共15页
This study examines the hydrodynamic performance of short-crested wave interaction with a new porous cylindrical structure by using the scaled boundary finite element method (SBFEM), which is a semi-analytical techn... This study examines the hydrodynamic performance of short-crested wave interaction with a new porous cylindrical structure by using the scaled boundary finite element method (SBFEM), which is a semi-analytical technique combining the advantages of the finite element method and the boundary element method and with its own special features as well. The cylindrical structure consists of dual arc-shaped porous outer cylinders circumscribing an impermeable inner cylinder. A central feature of the newly extended method is that two virtual outer cylinders extending the arc-shaped porous outer cylinders with the same centre are introduced and variable porous-effect parameters are also introduced for the two virtual cylinders, so that the final SBFEM quation still can be handled in a closed-form analytical manner in the radial direction and by a finite element approximation in the circumferential direction. The entire computational domain is divided into two bounded and one unbounded domains, and a variational principle formulation is used to derive the SBFEM equation in each sub-domain. The velocity potential in bounded and unbounded domains is formulated using sets of Bessel and Hankel functions respectively, and the unknown coefficients are determined from the matching conditions. The results of numerical verification show that the approach discretises only the outermost virtual cylinder with surface finite-elements and fewer elements are required to obtain very accurate results.Influences of the incident wave parameters and structural configurations on the hydrodynamics are examined. 展开更多
关键词 scaled boundary finite element method short-crested wave wave diffraction dual arc-shaped porous walls wave-structure interaction CYLINDER
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Investigation and characterization of an arc-shaped piezoelectric generator 被引量:2
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作者 HAN MengDi LIU Wen +2 位作者 ZHANG XiaoSheng MENG Bo ZHANG HaiXia 《Science China(Technological Sciences)》 SCIE EI CAS 2013年第11期2636-2641,共6页
A novel arc-shaped piezoelectric generator based on flexible PVDF thin film is presented and systemically studied.With a periodical external force,the generator can produce peak voltage of 45.6 V and peak power of 30.... A novel arc-shaped piezoelectric generator based on flexible PVDF thin film is presented and systemically studied.With a periodical external force,the generator can produce peak voltage of 45.6 V and peak power of 30.7μW.The maximum power density reaches 38.4μW/cm3with a 4 cm×2 cm×100μm device,at the optimum load resistance of 33.33 MOhm.The influence of frequency,size dimension and load resistance are investigated through experimental measurements.With this high output arc-shaped generator,capacitors can be effectively charged and three commercial LEDs have been directly lighted without any energy storage unit. 展开更多
关键词 piezoelectric generator arc-shaped PVDF high output self-powered system
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ANALYTICAL RESEARCH ON THE WAVE DIFFRACTION OF ARC-SHAPED FLOATING BREAKWATERS 被引量:1
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作者 MIAO Guo-ping CHENG Jian-sheng +1 位作者 WANG Jing-quan YOU Yun-xiang 《Journal of Hydrodynamics》 SCIE EI CSCD 2006年第1期1-10,共10页
An analytical method was developed to study the wave diffraction on are-shaped floating breakwaters. The floating breakwater was assumed to be rigid, thin, vertical, immovable and located in water of constant depth. T... An analytical method was developed to study the wave diffraction on are-shaped floating breakwaters. The floating breakwater was assumed to be rigid, thin, vertical, immovable and located in water of constant depth. The fluid domain was divided into two regions by imaginary interface, The velocity potential in each region is expanded by eigenfunctions. By satisfying continuity of pressure and normal velocity across the imaginary fluid interface, a set of linear algebraic equations could be obtained to determine the unknown coefficients for eigenfunctions. The accuracy of present model and the computer program were verified by a comparison with ex isting results for the case of arc-shaped bottom-mounted breakwaters. Numerical results, in the form of contour maps of the non-dimension wave amplitude around the breakwater, were presented for a range of wave and breakwater parame ters. Results show the wave diffraction on the arc-shaped floating breakwater is related to the incident wavelength and the draft of the breakwater. 展开更多
关键词 arc-shaped floating breakwater wave diffraction velocity potential EIGENFUNCTIONS
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Thermal performances and invisible thermal barrier formation mechanism of arc-shaped metal-fin-enhanced thermally activated building envelopes with directional heat charging feature
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作者 Yang Yang Sarula Chen +4 位作者 Jiqiang Zhang Zhenya Zhang Shuying Li Kunyu Chen Xiuyi Xiao 《Building Simulation》 SCIE EI 2024年第9期1461-1489,共29页
Thermally activated building envelopes(TABEs)are multifunctional component that combines structural and energy properties.Based on re-examining the heat charging processes,an arc-shaped metal-fin-enhanced TABE(Arc-fin... Thermally activated building envelopes(TABEs)are multifunctional component that combines structural and energy properties.Based on re-examining the heat charging processes,an arc-shaped metal-fin-enhanced TABE(Arc-finTABE)with directional heat charging features is proposed to optimize the thermal barrier formation process.A comprehensive parameterized analysis is conducted based on a validated mathematical model to explore the influence of 5 fin-structure design parameters and the static insulation thickness.Results verified that the directional charging strengthening fins can improve transient thermal performances of Arc-finATBE and enlarge horizontal and vertical sizes of the thermal energy accumulation area surrounding the pipeline,while the maximum growth in extra heat loss is less than 3.17%.From the perspective of promoting heat injection into expected areas,the straight main fin configurations with the angle of main fins of 30°,shank length ratio of 0.4 and no leftward mounted fins are preferred in load-reduction mode,while the angle of main fins of 150°,shank length ratio of 0.8 and multiple fin designs,especially with one of the main fins horizontally toward the indoor side,are more favorable in auxiliary-heating mode.Besides,it is recommended to add one arc-shaped branch fin to each main fin to achieve a balance between performance improvement and material usage.Moreover,branch fins with larger arc angles are preferred in auxiliary-heating mode,while smaller arc angles are conducive to injecting heat into the wall along main fins in load-reduction mode and preventing the heat near the inner surface from being extracted.Under the direct influence of the strengthened invisible thermal barrier,Arc-finTABEs can reduce the amount of static insulation layer by 20%–80%while achieving equivalent thermal performances as conventional high-performance walls. 展开更多
关键词 thermo-activated building envelope thermal barrier formation performance enhancement arc-shaped metal fins fin parameters CFD model
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SHEAR WAVE SCATTERING FROM A PARTIALLY DEBONDED PIEZOELECTRIC CYLINDRICAL INCLUSION 被引量:4
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作者 FengWenjie WangLiqun JiangZhiqing ZhaoYongmao 《Acta Mechanica Solida Sinica》 SCIE EI 2004年第3期258-269,共12页
The scattering of SH wave by a cylindrical piezoelectric inclusion partially debonded from its surrounding piezoelectric material is investigated using the wave function expansion method and singular integral ... The scattering of SH wave by a cylindrical piezoelectric inclusion partially debonded from its surrounding piezoelectric material is investigated using the wave function expansion method and singular integral equation technique. The debonding regions are modeled as mul- tiple arc-shaped interface cracks with non-contacting faces. By expressing the scattered ?elds as wave function expansions with unknown coe?cients, the mixed boundary value problem is ?rstly reduced to a set of simultaneous dual series equations. Then dislocation density functions are introduced as unknowns to transform these dual series equations into Cauchy singular integral equations of the ?rst type, which can be numerically solved easily. The solution is valid for arbi- trary number and size of the debonds. Finally, numerical results of the dynamic stress intensity factors are presented for the cases of one debond and two debonds. The e?ects of incidence direc- tion, crack con?guration and various material parameters on the dynamic stress intensity factors are respectively discussed. The solution of this problem is expected to ?nd applications in the investigation of dynamic fracture properties of piezoelectric materials with cracks. 展开更多
关键词 arc-shaped crack piezoelectric material wave scattering singular integral equation dynamic stress intensity factor
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Magnetoelectric effect in layered composites with arc shape 被引量:1
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作者 毕科 吴玮 王寅岗 《Chinese Physics B》 SCIE EI CAS CSCD 2011年第6期431-435,共5页
Magnetoelectric (ME) layered Ni/PZT/Ni composites with arc shape have been prepared by using electroless deposition. The ME effect is measured by applying both constant and alternating magnetic fields in longitudina... Magnetoelectric (ME) layered Ni/PZT/Ni composites with arc shape have been prepared by using electroless deposition. The ME effect is measured by applying both constant and alternating magnetic fields in longitudinal and transverse directions. The longitudinal ME voltage coefficient is much larger than the transverse one. With the increase of arc length or decrease of curvature, the resonance frequency of layered arc Ni/PZT/Ni composites gradually decreases, while the maximum of the ME voltage coefficient of the composites increases monotonously. The influence of the arc length and the curvature on ME coupling is discussed. The flat interface between the ferromagnetic and the piezoelectric phases in layered ME composites is believed to provide large ME voltage coefficient. 展开更多
关键词 MAGNETOELECTRIC arc-shaped electroless deposition resonance frequency
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