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Enhancing bending resistance of thin-walled stainless steel bellows through electric pulse heat treatment 认领 引用
1
作者 Meng-Ye Wang Meng Yan +2 位作者 Yong Liu Yue-Min Ma Hua-Gui Huang 《Journal of Iron and Steel Research International》 SCIE EI CSCD 2026年第6期169-186,共18页
To enhance the bending resistance of bellows,an environmentally friendly electric pulse heat treatment(EPHT)method was used.The strengthening mechanism was systematically studied by microstructure characterization,fin... To enhance the bending resistance of bellows,an environmentally friendly electric pulse heat treatment(EPHT)method was used.The strengthening mechanism was systematically studied by microstructure characterization,finite element simulation and bending test.The results showed that during EPHT process,the cross-sectional area of the trough was small,so that the current density was large,which made the temperature of the trough significantly higher than those of other regions.The temperature difference between the peak and the trough was most influenced by frequency.Empirical formulas were derived to predict the temperature and current density of the trough under varying parameters.The dislocation elimination and grain growth of the trough achieved the optimal balance at 800℃and 7 A/mm2,obtaining the best bending resistance.Bellows prepared by general heat treatment process(GHTP)had coarse grains and local high dislocation density areas.In contrast,the grains of EPHT bellows were fine,the dislocations were eliminated completely and uniformly,and the crack propagation path was more tortuous.Compared with GHTP,EPHT significantly reduced the dislocation density and eliminated oxide inclusions.This microstructural optimization altered the crack propagation behavior from simultaneous bidirectional growth(initiating from both high-strain surfaces and wall center)to unidirectional propagation(surface to center)of GHTP,thereby greatly reducing the crack propagation rate.Notably,the fracture mechanism changed from quasi-cleavage to ductile fracture.Compared with GHTP,the number of bending cycles of EPHT bellows increased by about 200%before fracture. 展开更多
关键词 Bending resistance Thin-walled bellow Electric pulse Dislocation elimination Crack propagation
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Numerical Simulation of the Pitting Corrosion Behavior of Stainless Steel Bellows Influenced by Varying Liquid Film Thicknesses 认领 引用
2
作者 Lu-Jun Ren Guo-Min Li +2 位作者 Zhen-Xiao Zhu Hai-Yan Xiong Bing Li 《电化学（中英文）》 CAS 北大核心 2025年第7期37-51,共15页
To advance the understanding of the corrosion behavior of stainless steel bellows in marine atmospheric environments and enhance the precision of service life predictions,this study employs finite element simulations ... To advance the understanding of the corrosion behavior of stainless steel bellows in marine atmospheric environments and enhance the precision of service life predictions,this study employs finite element simulations to investigate the pitting corrosion rates and pit morphologies of bellows peaks and troughs under varying electrolyte film thicknesses.The model incorporates localized electrochemical reactions,oxygen concentration,and homogeneous solution reactions.For improved computational accuracy,the fitted polarization curve data were directly applied as nonlinear boundary conditions on the electrode surface via interpolation functions.Simulation results reveal that the peak regions exhibit faster corrosion rates than the trough regions.With increasing electrolyte film thickness(from 10μm to 500μm),corrosion rates at both peaks and troughs decrease progressively,and after 120 hours of simulation,the maximum corrosion rate at the peaks declines from 0.720 mm/a to 0.130 mm/a,and at the troughs from 0.520 mm/a to 0.120 mm/a,with the disparity in corrosion rates diminishing over time.Furthermore,as corrosion progresses,pits propagate deeper into the substrate,exhibiting both vertical penetration and lateral expansion along the passive film interface,ultimately breaching the substrate.This research offers valuable insights into designing corrosion mitigation strategies for stainless steel bellows in marine environments. 展开更多
关键词 Finite element method Pitting corrosion Stainless steel bellows Electrolyte film thickness
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GENERAL SOLUTION FOR U-SHAPED BELLOWS OVERALL-BENDING PROBLEMS 认领 引用 被引量：4
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作者 朱卫平 郭平 黄黔 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI 2000年第4期371-382,共12页
The formulae for stresses and angular displacements of U-shaped bellows overall bending in a meridian plane under pure bending moments are presented based on the general solution for slender ring shells proposed by Zh... The formulae for stresses and angular displacements of U-shaped bellows overall bending in a meridian plane under pure bending moments are presented based on the general solution for slender ring shells proposed by Zhu Weiping, et al. and the solution for ring plates. The results evaluated in this paper are compared with those on EJMA (standards of the expansion joint manufacturers association) and of the experiment given by Li Tingxilz, et al. 展开更多
关键词 flexible shells shells of revolution circular ring shells bellows U-shaped bellows
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Local Buckling-Induced Forming Method to Produce Metal Bellows 认领 引用 被引量：1
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作者 Tianyin Zhang Dongqing Li +2 位作者 Tianjiao Xu Yongfeng Sui Xianhong Han 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2023年第1期104-114,共11页
A novel buckling-induced forming method is proposed to produce metal bellows.The tube billet is firstly treated by local heating and cooling,and the axial loading is applied on both ends of the tube,then the buckling ... A novel buckling-induced forming method is proposed to produce metal bellows.The tube billet is firstly treated by local heating and cooling,and the axial loading is applied on both ends of the tube,then the buckling occurs at the designated position and forms a convolution.In this paper,a forming apparatus is designed and developed to produce both discontinuous and continuous bellows of 304 stainless steel,and their characteristics are discussed respectively.Furthermore,the influences of process parameters and geometric parameters on the final convolution profile are deeply studied based on FEM analysis.The results suggest that the steel bellows fabricated by the presented buckling-induced forming method have a uniform shape and no obvious reduction of wall thickness.Meanwhile,the forming force required in the process is quite small. 展开更多
关键词 Buckling-induced forming Dieless No wall-thinning Stainless-steel bellows
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Subsea Compensation of Pressure Based on Reducer Bellows 认领 引用
5
作者 Shihong Xiao Shichao Zhou +2 位作者 Linlin Yue Xianyou He Maolin Xiang 《Fluid Dynamics & Materials Processing》 EI 2023年第10期2549-2567,共19页
In this study,the pressure compensation mechanism of a reducer bellows is analyzed.This device is typically used to reduce the size of undersea instruments and improve related pressure resistance and sealing capabilit... In this study,the pressure compensation mechanism of a reducer bellows is analyzed.This device is typically used to reduce the size of undersea instruments and improve related pressure resistance and sealing capabilities.Here,its axial stiffness is studied through a multi-fold approach based on theory,simulations and experiments.The results indicate that the mechanical strength of the reducer bellows,together with the oil volume and temperature are the main factors influencing its performances.In particular,the wall thickness,wave number,middle distance,and wave height are the most influential parameters.For a certain type of reducer bellows,the compensation capacity attains a maximum when the wave number ratio is between 6:6 and 8:4,the wall thickness is 0.3 mm,and the wave height is between 4–5 mm and 5–6 mm.Moreover,the maximum allowable ambient pres-sure of the optimized reducer bellows can reach 62.6 MPa without failure,and the maximum working water depth is 6284 m. 展开更多
关键词 Subsea reducer bellows pressure compensation compressible fluid mechanical strength
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Volume Optimisation of Multi-stable Origami Bellows for Deployable Space Habitats 认领 引用 被引量：5
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作者 Mengzhu Yang Joe Defillion +1 位作者 Fabrizio Scarpa Mark Schenk 《Acta Mechanica Solida Sinica》 SCIE EI CSCD 2023年第4期514-530,共17页
Origami bellows are formed by folding flat sheets into closed cylindrical structures along predefined creases.As the bellows unfold,the volume of the origami structure will change significantly,offering potential for ... Origami bellows are formed by folding flat sheets into closed cylindrical structures along predefined creases.As the bellows unfold,the volume of the origami structure will change significantly,offering potential for use as inflatable deployable structures.This paper presents a geometric study of the volume of multi-stable Miura-ori and Kresling bellows,focusing on their application as deployable space habitats.Such habitats would be compactly stowed during launch,before expanding once in orbit.The internal volume ratio between different deployed states is investigated across the geometric design space.As a case study,the SpaceX Falcon 9 payload fairing is chosen for the transportation of space habitats.The stowed volume and effective deployed volume of the origami space habitats are calculated to enable comparison with conventional habitat designs.Optimal designs for the deployment of Miura-ori and Kresling patterned tubular space habitats are obtained using particle swarm optimisation(PSO)techniques.Configurations with significant volume expansion can be found in both patterns,with the Miura-ori patterns achieving higher volume expansion due to their additional radial deployment.A multi-objective PSO(MOPSO)is adopted to identify trade-offs between volumetric deployment and radial expansion ratios for the Miura-ori pattern. 展开更多
关键词 Optimisation Origami bellows Space habitat Origami volume
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The Dynamical FSI Simulation for Bellows Inflating to Disperse Bomblets 认领 引用 被引量：2
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作者 Cheng Zhang Huijun Ning +1 位作者 Kun Jiang Hao Wang 《Journal of Harbin Institute of Technology(New Series)》 CAS 2016年第2期51-58,共8页
According to the characteristics of fluid-structure interaction( FSI) in the process of metal bellows inflating to disperse bomblets,a 3D dynamical FSI model( W model) which describes the interaction between a viscous... According to the characteristics of fluid-structure interaction( FSI) in the process of metal bellows inflating to disperse bomblets,a 3D dynamical FSI model( W model) which describes the interaction between a viscous compressible flow and a structure undergoing large deformationis established. Then the dynamic characteristics of the metal bellows deformation,the changing law of the internal flow field and the motion law of the bombs are acquired.Where the internal pressure and bombs' moving law are approximate to interior ballistic results,which indicates the W model established reasonably. Besides,considering gaps existing atthe bellows' tow ends,the dynamical FSI modelcontaining gaps( Y model) is also built. The results of the W and Y models are compared and the results show that the existence of the gaps has little influence to the flow field and the stress distributionin the bellows,but obviously reduces the separation speed of the bomblets about 10%. 展开更多
关键词 metal bellows large deformation gap
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PROBLEMS OF U-SHAPED BELLOWS WITH NONLINEAR DEFORM TION OF LARGE AXISYMMETRICAL DEFLECTION(Ⅰ)--COUNTING NONLINEAR DEFORMATIONS OF RING SHELLS AND COMPRESSED ANGLE OF BELLOWS 认领 引用 被引量：3
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作者 Hu Liang 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI 1993年第3期253-267,共15页
This paper follows the work of[1,2].There are some progress in dealing with moderately small rotations(the squares of rotation angles are the order of magnitude of strains)of middle surface normals of inside and outsi... This paper follows the work of[1,2].There are some progress in dealing with moderately small rotations(the squares of rotation angles are the order of magnitude of strains)of middle surface normals of inside and outside ring shells and compressed angle of bellows.Calculation results agree with experiments well.To bellow design,the method given in this paper is of practical value and the discussion of the influence of compressed angle on characteristic relation is helpful. 展开更多
关键词 U-shaped bellows large axisymmetrical deflection compressed angle
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Deformation behaviors of four-layered U-shaped metallic bellows in hydroforming 认领 引用 被引量：10
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作者 Jing LIU Zhiyong LV +1 位作者 Yang LIU Lanyun LI 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2020年第12期3479-3494,共16页
Because of the complex constraint effects among layers in multi-layered metallic bellows hydroforming,the stress concentration and defects such as wrinkling and fracture may easily occur.It is a key to reveal the defo... Because of the complex constraint effects among layers in multi-layered metallic bellows hydroforming,the stress concentration and defects such as wrinkling and fracture may easily occur.It is a key to reveal the deformation behaviors in order to obtain a sound product.Based on the ABAQUS platform,a 3 D-FE model of the four-layered U-shaped metallic bellow hydroforming process is established and validated by experiment.The stress and strain distributions,wall thickness variations and bellow profiles of each layer in the whole process,including bulging,folding and springback stages,are studied.Then deformation behaviors of bellows under different forming conditions are discussed.It is found that the wall thinning degrees of different layer vary after hydroforming,and is the largest for the inner layer and smallest for the outer layer.At folding stage,the wall thinning degree of the crown point increases lineally,and the difference among layers increases as the process going.The displacements of the crown point decrease from the inner layer to the outer layer.After springback,the U-shaped cross section changes to a tongue shape,the change of convolution pitch is much larger than the change of convolution height,and the springback values of the inner layer are smaller than the outer layer.An increase in the internal pressure and die spacing cause the maximum wall thinning degree and springback increase.With changing of process parameters,bellows with deep convolution are easily encountered wall thinning during hydroforming and convolution distortion after springback.This research is helpful for precision forming of multi-layered bellows. 展开更多
关键词 Deformation behaviors Four-layered U-shaped bellow Hydroforming Numerical simulation Springback
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ON PROBLEMS OF U-SHAPED BELLOWS WITH NONLINEAR DEFORMATION OF LARGE AXISYMMETRICAL DEFLECTION(Ⅱ)——COUNTING VARIATION OF THICKNESS DISTRIBUTION 认领 引用 被引量：1
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作者 Hu Liang 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI 1993年第6期559-564,共6页
On the basis of paper[1],assuming the logarithm of thickness at arbitrary point on a U-shaped bellows meridian is linear with the logarithm of distance between that point and axis of symmetry,perturbation solutions of... On the basis of paper[1],assuming the logarithm of thickness at arbitrary point on a U-shaped bellows meridian is linear with the logarithm of distance between that point and axis of symmetry,perturbation solutions of the corresponding problems of large axisymmetrical deflection are given.The effects of thickness distribution variation,which result from technology factors,on stiffness of bellows are discussed. 展开更多
关键词 U-shaped bellows variation of thickness distribution,decay rate
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FINITE ELEMENT DISPLACEMENT PERTURBATION METHOD FOR GEOMETRIC NONLINEAR BEHAVIORS OF SHELLS OF REVOLUTION OVERALL BENDING IN A MERIDIONAL PLANE AND APPLICATION TO BELLOWS (Ⅰ) 认领 引用
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作者 ZHU Wei-ping +1 位作者 HUANG Qian 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI 2002年第12期1374-1389,共16页
In order to analyze bellows effectively and practically, the finite_element_displacement_perturbation method (FEDPM) is proposed for the geometric nonlinear behaviors of shells of revolution subjected to pure bending ... In order to analyze bellows effectively and practically, the finite_element_displacement_perturbation method (FEDPM) is proposed for the geometric nonlinear behaviors of shells of revolution subjected to pure bending moments or lateral forces in one of their meridional planes. The formulations are mainly based upon the idea of perturba_ tion that the nodal displacement vector and the nodal force vector of each finite element are expanded by taking root_mean_square value of circumferential strains of the shells as a perturbation parameter. The load steps and the iteration times are not as arbitrary and unpredictable as in usual nonlinear analysis. Instead, there are certain relations between the load steps and the displacement increments, and no need of iteration for each load step. Besides, in the formulations, the shell is idealized into a series of conical frusta for the convenience of practice, Sander's nonlinear geometric equations of moderate small rotation are used, and the shell made of more than one material ply is also considered. 展开更多
关键词 shell of revolution bellows deflection by lateral force geometrical nonlinearity perturbation technique finite element method
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GENERAL SOLUTION OF THE OVERALL BENDING OF FLEXIBLE CIRCULAR RING SHELLS WITH MODERATELY SLENDER RATIO AND APPLICATIONS TO THE BELLOWS (Ⅳ)-CALCULATION FOR U-SHAPED BELLOWS 认领 引用
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作者 ZHU Wei-ping +1 位作者 HUANG Qian 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI 2002年第10期1164-1169,共6页
This is one of the applications of Part (Ⅰ),in which the angular stiffness, and the corresponding stress distributions of U_shaped bellows were discussed. The bellows was divided into protruding sections, concave sec... This is one of the applications of Part (Ⅰ),in which the angular stiffness, and the corresponding stress distributions of U_shaped bellows were discussed. The bellows was divided into protruding sections, concave sections and ring plates for the calculation that the general solution (Ⅰ) with its reduced form to ring plates were used respectively, but the continuity of the surface stresses and the meridian rotations at each joint of the sections were entirely satisfied. The present results were compared with those of the slender ring shell solution proposed earlier by the authors, the standards of the Expansion Joint Manufacturers Association (EJMA), the experiment and the finite element method. It is shown that the governing equation and the general solution (Ⅰ) are very effective. 展开更多
关键词 theory of flexible shell circular ring shell U_shaped bellows pure bending general solution
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GENERAL SOLUTION OF THE OVERALL BENDING OF FLEXIBLE CIRCULAR RING SHELLS WITH MODERATELY SLENDER RATIO AND APPLICATIONS TO THE BELLOWS (Ⅲ)-CALCULATION FOR C-SHAPED BELLOWS 认领 引用
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作者 ZHU Wei-ping +1 位作者 HUANG Qian 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI 2002年第10期1153-1163,共11页
This is one of the applications of Part (Ⅰ), in which the angular stiffness, the lateral stiffness and the corresponding stress distributions of C_shaped bellows were calculated. The bellows was divided into protrudi... This is one of the applications of Part (Ⅰ), in which the angular stiffness, the lateral stiffness and the corresponding stress distributions of C_shaped bellows were calculated. The bellows was divided into protruding sections and concave sections for the use of the general solution (Ⅰ), but the continuity of the stress resultants and the deformations at each joint of the sections were entirely satisfied. The present results were compared with those of the other theories and experiments, and are also tested by the numerically integral method. It is shown that the governing equation and the general solution (Ⅰ) are very effective. 展开更多
关键词 theory of flexible shell circular ring shell C_shaped bellows overall bending general solution
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GENERAL SOLUTION OF THE OVERALL BENDING OF FLEXIBLE CIRCULAR RING SHELLS WITH MODERATELY SLENDER RATIO AND APPLICATIONS TO THE BELLOWS (Ⅰ)-GOVERNING EQUATION AND GENERAL SOLUTION 认领 引用
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作者 ZHU Wei-ping +1 位作者 HUANG Qian 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI 2002年第8期889-897,共9页
The overall bending of circular ring shells subjected to bending moments and lateral forces is discussed. The derivation of the equations was based upon the theory of flexible shells generalized by E.L. Axelrad and th... The overall bending of circular ring shells subjected to bending moments and lateral forces is discussed. The derivation of the equations was based upon the theory of flexible shells generalized by E.L. Axelrad and the assumption of the moderately slender ratio less than 1/3 (i.e., ratio between curvature radius of the meridian and distance from the meridional curvature center to the axis of revolution). The present general solution is an analytical one convergent in the whole domain of the shell and with the necessary integral constants for the boundary value problems. It can be used to calculate the stresses and displacements of the related bellows. The whole work is arranged into four parts: (Ⅰ) Governing equation and general solution; (Ⅱ) Calculation for Omega_shaped bellows; (Ⅲ) Calculation for C_shaped bellows; (Ⅳ) Calculation for U_shaped bellows. This paper is the first part. 展开更多
关键词 theory of flexible shell circular ring shell bellows lateral bending load moderately slender ratio general solution
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GENERAL SOLUTION OF THE OVERALL BENDING OF FLEXIBLE CIRCULAR RING SHELLS WITH MODERATELY SLENDER RATIO AND APPLICATIONS TO THE BELLOWS (Ⅱ)- CALCULATION FOR OMEGA-SHAPED BELLOWS 认领 引用
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作者 ZHU Wei-ping +1 位作者 HUANG Qian 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI 2002年第8期898-905,共8页
is one of the applications of (Ⅰ), in which the angular stiffness, the lateral stiffness and the corresponding stress distributions of Omega_shaped bellows were calculated, and the present results were compared with ... is one of the applications of (Ⅰ), in which the angular stiffness, the lateral stiffness and the corresponding stress distributions of Omega_shaped bellows were calculated, and the present results were compared with those of the other theories and experiments. It is shown that the non_homogeneous solution of (Ⅰ) can solve the pure bending problem of the bellows by itself, and be more effective than by the theory of slender ring shells; but if a lateral slide of the bellows support exists the non_homogeneous solution will no longer entirely satisfy the boundary conditions of the problem, in this case the homogeneous solution of (Ⅰ) should be included, that is to say, the full solution of (Ⅰ) can meet all the requirements. 展开更多
关键词 theory of flexible shell circular ring shell Omega_shaped bellows general solution
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Application of Non-homogeneous Solution for Equations of Slender Ring Shells to Overall-Bending Problem of Ω-Shaped Bellows 认领 引用 被引量：2
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作者 Zhu Weiping Guo Ping 《Advances in Manufacturing》 EI CAS 1999年第2期37-42,共6页
A linear complex equation for slender ring shells overall bending in a meridian plane is given based on E. L. Axelrad's theory of flexible shells. And the non homogeneous solution is obtained from W. Z. Chien'... A linear complex equation for slender ring shells overall bending in a meridian plane is given based on E. L. Axelrad's theory of flexible shells. And the non homogeneous solution is obtained from W. Z. Chien's solution for axial symmetrical slender ring shells to investigate the overall bending problem of Ω shaped bellows subjected to pure bending moments. The values calculated in the present paper are very close to the existing experiment. Thus Chien's work on axial symmetrical problems for ring shells has been extended to overall bending problems. 展开更多
关键词 flexible shells shells of revolution circular ring shells curved tubes bellows
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Research and Development of ITER Bellows Assemblies 认领 引用
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作者 HU Gang 《Southwestern Institute of Physics Annual Report》 2005年第1期92-94,共3页
In ITER facilities, there are some special expansion joints connected with the openings of cryostat. Expect for the assemblies connected with NB openings, others are rectangular section with big dimensions and severe ... In ITER facilities, there are some special expansion joints connected with the openings of cryostat. Expect for the assemblies connected with NB openings, others are rectangular section with big dimensions and severe working conditions and they are important for ITER safe runing. 展开更多
关键词 Bellows Expansion joints
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Piping design and bellows optimization for pneumatic conveying systems based on EDEMfluent coupled methods for rice 认领 引用
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作者 Chengsai FAN Biao CHENG +3 位作者 Jiaxin TAN Ruiyin HE Gaoming XU Jingliu ZHANG 《Frontiers of Agricultural Science and Engineering》 CAS CSCD 2026年第2期71-90,共20页
Currently,the main optimization of pneumatic conveying seed-discharge systems targets distributors,ignoring the important role of pipelines.In this study,simulations were used to determine an improved structure of the... Currently,the main optimization of pneumatic conveying seed-discharge systems targets distributors,ignoring the important role of pipelines.In this study,simulations were used to determine an improved structure of the conveying pipe.The horizontal pipe was determined to be a 300 mm straight pipe,which was connected under the vertical bellows as a transition.This study adopted the L9(34)orthogonal test method to optimize the bellows parameters,using as index the coefficient of variation of the uniformity of the bellow outlets.The indoor bench test was designed to validate different flow rate and bellows length combinations.The optimal bellows parameter combination of the corrugated circle had a radius of 8 mm,bellows length of 500 mm,corrugation distance of 40 mm and corrugation length of 16 mm,achieving a 3.46%coefficient of variation of the particle distribution in the plumbing.Under various particle mass flow rates(33.5,67.0,101 g·s−1),the bellows length of the optimal solution was verified to be in the interval of 400−500 mm,and the consistency coefficients of the variations in row displacements of the system satisfied the requirements.This study provides guidance for the design and application of piping in pneumatic seed-discharge systems. 展开更多
关键词 Air distribution bellows coupled EDEMFluent design methodology rice
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Predicting bond-slip behaviour in grouted bellows connect rebar using deep learning 认领 引用 被引量：1
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作者 Yihu Chen Xingshuo Yang +3 位作者 Jingchao Lin Guangxin Xie Min Zhang Yanwei Wang 《Smart Construction》 2025年第1期118-144,共27页
Grouted Bellows Connect Rebar(GBR)technology is critical for ensuring reliable connections in precast concrete components.The bond-slip behaviour,a core metric for assessing GBR connection performance,presents signifi... Grouted Bellows Connect Rebar(GBR)technology is critical for ensuring reliable connections in precast concrete components.The bond-slip behaviour,a core metric for assessing GBR connection performance,presents significant complexity,and existing empirical models often fall short in prediction accuracy to meet engineering demands.Addressing this challenge,this study introduces an innovative hybrid model(CNN-LSTM)that integrates convolutional neural networks with long shortterm memory networks.Utilizing eight critical parameters,such as grouting strength,reinforcement ultimate strength,and the anchorage length-to-diameter ratio of the reinforcement,the model achieves precise predictions of GBR bond stress.This study systematically collected data from 114 sets of GBR pull-out tests,constructing a dataset comprising 2,272 bond-slip samples for model training and validation.Additionally,15 GBR independent samples were independently fabricated and multiple samples were extracted to assess the model generalization capability.Experimental results demonstrate that the CNN-LSTM model significantly outperforms traditional empirical models in predicting bond stress and exhibits superior generalization across key metrics,including total energy consumption,maximum bond stress,failure modulus,and residual energy.Parameter importance analysis reveals that grouting strength,reinforcement ultimate strength,and the anchorage length-to-diameter ratio are the most influential factors in bond stress prediction.Building on the CNN-LSTM model predictions,this study establishes an improved empirical model with clear physical significance,offering a reliable computational foundation for engineering applications. 展开更多
关键词 grouting bellows precast concrete components CNN-LSTM bond stress energy consumption maximum bond stress
Proposal of metal bellows-based fiber Bragg grating accelerometer 认领 引用 被引量：4
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作者 张敬花 乔学光 +4 位作者 忽满利 冯忠耀 高宏 杨扬 周锐 《Chinese Optics Letters》 SCIE EI CAS CSCD 2011年第9期21-24,共4页
A metal bellows-based fiber Bragg grating （FBG） accelerometer is proposed and experimentally demonstrated. The optical fiber （containing the FBG） is pre-tensioned, and the two ends of the optical fiber are fixed d... A metal bellows-based fiber Bragg grating （FBG） accelerometer is proposed and experimentally demonstrated. The optical fiber （containing the FBG） is pre-tensioned, and the two ends of the optical fiber are fixed directly from the shell to the inertial mass. In this design, the FBG is uniformly tensioned to obtain a constant strain distribution over it. By employing this configuration, the FBG always has a sharp reflection characteristic with no broadening in its reflection spectrum during wavelength shifting. Dynamic vibration measurements show that the proposed FBG accelerometer has a wide frequency response range （5-110 Hz） and an extremely high sensitivity （548.7 pro/g）. The two important indicators of FBG accelerometer can be tuned by the addition of mass to tailor the sensor performance to specific applications, identifying it as a good candidate for structural health monitoring. 展开更多
关键词 Accelerometers Bellows Electric arc welding Fibers Frequency response Structural health monitoring
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