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Experimental study on the shear behavior of grout-infilled specimens and micromechanical properties of grout-rock interface 被引量:1
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作者 LI Wen-shuai JIANG Bang-you +2 位作者 GU Shi-tan YANG Xu-xu Faiz U.A.SHAIKH 《Journal of Central South University》 SCIE EI CAS CSCD 2022年第5期1686-1700,共15页
The grout-rock interfacial property is one of the key factors associated with the strength of grouted rock masses.In this study,direct shear tests and nanoindentation tests were adopted to investigate the mechanical p... The grout-rock interfacial property is one of the key factors associated with the strength of grouted rock masses.In this study,direct shear tests and nanoindentation tests were adopted to investigate the mechanical properties of the grout-rock interface at both the macroscale and microscale.The cohesion of the cement specimens was higher than that of the grout-infilled joint specimens,while their internal friction angle was lower than that of the grout-infilled joint specimens.A“separation method”for identifying the different phases according to the qualitative and quantitative estimations was introduced,and the irregular interfacial transition zone(ITZ)thickness and elastic modulus were estimated.The ITZ thickness of the grout-infilled sandstone specimen ranged from 0 to 30μm,whereas it was within the range of 10-40μm for the grout-infilled mudstone specimen.The average elastic modulus of the ITZ in grout-infilled sandstone and mudstone specimens was approximately 58.2%and 54.1%lower than that of the bulk grout,respectively.Regarding the incidence of the rock type,the interlacing between the grout and sandstone was better developed.The ITZ with a higher porosity and lower modulus had a significant effect on the mechanical properties of the grout-infilled specimens. 展开更多
关键词 grout-rock interface shear mechanical parameter micromechanical property interfacial transition zone
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Effect of mechanical degradation of laminated elastomeric bearings and shear keys upon seismic behaviors of small-to-medium-span highway bridges in transverse direction 被引量:2
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作者 Wu Gang Wang Kehai +1 位作者 Zhang Panpan Lu Guanya 《Earthquake Engineering and Engineering Vibration》 SCIE EI CSCD 2018年第1期205-220,共16页
Laminated elastomeric bearings have been widely used for small-to-medium-span highway bridges in China, in which concrete shear keys are set transversely to prohibit large girder displacement. To evaluate bridge seism... Laminated elastomeric bearings have been widely used for small-to-medium-span highway bridges in China, in which concrete shear keys are set transversely to prohibit large girder displacement. To evaluate bridge seismic responses more accurately, proper analytical models of bearings and shear keys should be developed. Based on a series of cyclic loading experiments and analyses, rational analytical models of laminated elastomeric bearings and shear keys, which can consider mechanical degradation, were developed. The effect of the mechanical degradation was investigated by examining the seismic response of a small-to-medium-span bridge in the transverse direction under a wide range of peak ground accelerations(PGA). The damage mechanism for small-to-medium-span highway bridges was determined, which can explain the seismic damage investigation during earthquakes in recent years. The experimental results show that the mechanical properties of laminated elastomeric bearings will degrade due to friction sliding, but the degree of decrease is dependent upon the influencing parameters. It can be concluded that the mechanical degradation of laminated elastomeric bearings and shear keys play an important role in the seismic response of bridges. The degradation of mechanical properties of laminated elastomeric bearings and shear keys should be included to evaluate more precise bridge seismic performance. 展开更多
关键词 bridge engineering mechanical degradation seismic response friction sliding shear keys
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Draping Behavior of Carbon Non-Crimp Fabrics and Its Effects on Mechanical Performance of the Hemispherical Composites 被引量:1
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作者 李龙 肇研 +3 位作者 LIU Gang ZHAO Xiaoran SONG Jiupeng GONG Ming 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2018年第3期720-728,共9页
In order to investigate the draping behavior of non-crimp fabrics(NCFs), two types of carbon NCFs with tricot-chain stitches or chain stitches were formed on a hemispherical mould via a stretch forming process. The ... In order to investigate the draping behavior of non-crimp fabrics(NCFs), two types of carbon NCFs with tricot-chain stitches or chain stitches were formed on a hemispherical mould via a stretch forming process. The shear angle and forming defects of the fabrics were measured on the hemisphere, under different blank holder forces(BHFs). The results showed that increasing BHF could enhance the shear angle slightly, reduce the asymmetry for the deformation of the fabrics, and change the main type of the process-induced defects. Besides, compression tests were performed on the corresponding composite components. By analyzing the change of fiber volume fraction and structural parameters of the textile reinforcements, the effects of draping behavior of NCFs on the mechanical performance of the composites were studied. The results reveal that draping process has distinguishable impacts on the mechanical properties of the final components, which is closely related to the stitching pattern of the NCFs. 展开更多
关键词 non-crimp fabric hemispherical forming shear deformation mechanical properties liquid composite molding
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Analytical and numerical solutions for shear mechanical behaviors of structural plane
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作者 何忠明 熊喆怡 +1 位作者 胡庆国 杨明 《Journal of Central South University》 SCIE EI CAS 2014年第7期2944-2949,共6页
The original descriptive model of shear stress and shear displacement only reflects the stress deformation characteristics of plastic structural plane.The index model was revised and piecewise index model was built to... The original descriptive model of shear stress and shear displacement only reflects the stress deformation characteristics of plastic structural plane.The index model was revised and piecewise index model was built to describe the stress deformation characteristics of plastic structural plane and brittle structural plane.The relation of stress and strain to the failure mode of structural plane considering the effect of its shape was investigated,and a model which could reflect the relation between undulate angle and shear strength was built.The result indicates that structural plane presents nonlinear characteristics,specifically,the value of undulate angle,as well as corresponding shear strength,becomes larger as the normal stress decreases. 展开更多
关键词 structural plane shear mechanical behavior model failure mode nonlinear characteristics numerical analysis
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Multi-scale modeling for prediction of mechanical performance in brazed GH99 thin-walled structure
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作者 Yazhou LIU Shengpeng HU +4 位作者 Yanyu SONG Wei FU Xiaoguo SONG Ning GUO Weimin LONG 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2024年第7期550-563,共14页
Superalloy thin-walled structures are achieved mainly by brazing,but the deformation process of brazed joints is non-uniform,making it a challenging research task.This paper records a thorough investigation of the eff... Superalloy thin-walled structures are achieved mainly by brazing,but the deformation process of brazed joints is non-uniform,making it a challenging research task.This paper records a thorough investigation of the effect of brazing parameters on the microstructure of joints and its mechanical properties,which mainly inquires into the deformation and fracture mechanisms in the shearing process of GH99/BNi-5a/GH99 joints.The macroscopic-microscopic deformation mechanism of the brazing interface during shearing was studied by Crystal Plasticity(CP)and Molecular Dynamics(MD)on the basis of the optimal brazing parameters.The experimental results show that the brazing interface is mainly formed by(Ni,Cr,Co)(s,s)and possesses a shear strength of approximately 546 MPa.The shearing fracture of the brazed joint occurs along the brazing seam,displaying the characteristics of intergranular fracture.MD simulations show that dislocations disassociate and transform into fine twinning with increased strain.CP simulated the shear deformation process of the brazed joint.The multiscale simulation results are consistent with the experimental results.The mechanical properties of thin-walled materials for brazing are predicted using MD and CP methods. 展开更多
关键词 Multi-scale modeling BRAZING Shear mechanisms Crystal plasticity GH99 superalloy
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Shear failure behaviors and degradation mechanical model of rockmass under true triaxial multi-level loading and unloading shear tests OA
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作者 Zhi Zheng Ronghua Li +3 位作者 Pengzhi Pan Jinghua Qid Guoshao Su Hong Zheng 《International Journal of Mining Science and Technology》 SCIE EI CAS 2024年第10期1385-1408,共24页
The redistribution of three-dimensional(3D)geostress during underground tunnel excavation can easily induce to shear failure along rockmass structural plane,potentially resulting in engineering disasters.However,the c... The redistribution of three-dimensional(3D)geostress during underground tunnel excavation can easily induce to shear failure along rockmass structural plane,potentially resulting in engineering disasters.However,the current understanding of rockmass shear behavior is mainly based on shear tests under2D stress without lateral stress,the shear fracture under 3D stress is unclear,and the relevant 3D shear fracture theory research is deficient.Therefore,this study conducted true triaxial cyclic loading and unloading shear tests on intact and bedded limestone under different normal stressσnand lateral stressσpto investigate the shear strength,deformation,and failure characteristics.The results indicate that under differentσnandσp,the stress–strain hysteresis loop area gradually increases from nearly zero in the pre-peak stage,becomes most significant in the post-peak stage,and then becomes very small in the residual stage as the number of shear test cycles increases.The shear peak strength and failure surface roughness almost linearly increase with the increase inσn,while they first increase and then gradually decrease asσpincreases,with the maximum increases of 12.9%for strength and 15.1%for roughness.The shear residual strength almost linearly increases withσn,but shows no significant change withσp.Based on the acoustic emission characteristic parameters during the test process,the shear fracture process and microscopic failure mechanism were analyzed.As the shear stressτincreases,the acoustic emission activity,main frequency,and amplitude gradually increase,showing a significant rise during the cycle near the peak strength,while remaining almost unchanged in the residual stage.The true triaxial shear fracture process presents tensile-shear mixture failure characteristics dominated by microscopic tensile failure.Based on the test results,a 3D shear strength criterion considering the lateral stress effect was proposed,and the determination methods and evolution of the shear modulus G,cohesion cjp,friction angleφjp,and dilation angleψjpduring rockmass shear fracture process were studied.Under differentσnandσp,G first rapidly decreases and then tends to stabilize;cjp,φjp,andψjpfirst increase rapidly to the maximum value,then decrease slowly,and finally remain basically unchanged.A 3D shear mechanics model considering the effects of lateral stress and shear parameter degradation was further established,and a corresponding numerical calculation program was developed based on3D discrete element software.The proposed model effectively simulates the shear failure evolution process of rockmass under true triaxial shear test,and is further applied to successfully reveal the failure characteristics of surrounding rocks with structural planes under different combinations of tunnel axis and geostress direction. 展开更多
关键词 True triaxial shear test Lateral stress effect Acoustic emission monitoring Shear parameters evolution Shear degradation mechanical model
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Application Effect of Key Technology for Fine WoolProduction
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作者 li fanwen wen yazhou xu tingting 《Animal Husbandry and Feed Science》 CAS 2018年第4期216-218,共3页
By analyzing the gap between China and foreign countries in fine wool production, combined with the practical experience of fine woolproduction, the application effects of sheep clothing full coverage technology, mech... By analyzing the gap between China and foreign countries in fine wool production, combined with the practical experience of fine woolproduction, the application effects of sheep clothing full coverage technology, mechanical shearing technology, wool grading and collection technology, scale packaging technology and standardized shearing environment control technique were evaluated, in order to provide reference for popularization and application of fine wool production. 展开更多
关键词 Fine wool Key technique Sheep clothing mechanical shearing Effect analysis
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Failure mechanism and stability control of a large section of very soft roadway surrounding rock shear slip 被引量:24
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作者 Meng Bo Jing Hongwen +1 位作者 Chen Kunfu Su Haijian 《International Journal of Mining Science and Technology》 SCIE EI 2013年第1期127-134,共8页
The measured data and simulation test phenomenon of surrounding rock deformation and failure at the project site indicate that shear failure which firstly occurs in surrounding rock, block slip and second shear failur... The measured data and simulation test phenomenon of surrounding rock deformation and failure at the project site indicate that shear failure which firstly occurs in surrounding rock, block slip and second shear failure are the root cause of deformation and damage of supporting structure of the surrounding rock at a large scale. We derived limit load of surrounding rock shear slip failure and reasonable support resistance of given load by means of shear slip line field theory, discussed the main factors which influence the limit load of surrounding rock. Shear slip line field and limit load of circular tunnel surrounding rock were obtained by means of physical simulation test, which agreed well with the theoretical analysis results. Based on the theoretical analysis and physical simulation test, the cause deformation and failure at large scale of Xinshanghai No. 1 coal mine big section ingate was analyzed, and the shear failure resistance and block slip in surrounding rock were proposed as the core technical supporting ideas. Proper range of supporting resistance which came from calculation was suggested. The support scheme which is mainly composed of large grouting anchor, sprayed anchor net support technique and full-face grille concrete finally ended the dilemma of repeated failure and mending of ingate and created critical conditions for smooth production in the coal mine. 展开更多
关键词 Rock mechanics Surrounding rock Shear and slip Shear and slip resistance Limit load
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Fluid–solid coupling analysis of rock pillar stability for concealed karst cave ahead of a roadway based on catastrophic theory 被引量:10
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作者 Zhao Yanlin Peng Qingyang +2 位作者 Wan Wen Wang Weijun Chen Bin 《International Journal of Mining Science and Technology》 SCIE EI 2014年第6期737-745,共9页
In order to study the mechanism of water inrush from a concealed, confined karst cave, we established a fluid–solid coupling model of water inrush from a concealed karst cave ahead of a roadway and a strength reducti... In order to study the mechanism of water inrush from a concealed, confined karst cave, we established a fluid–solid coupling model of water inrush from a concealed karst cave ahead of a roadway and a strength reduction method in a rock pillar for preventing water inrush based on catastrophic theory. Fluid–solid coupling effects and safety margins in a rock pillar were studied. Analysis shows that rock pillar instability, exerted by disturbance stress and seepage stress, is the process of rock pillar catastrophic destabilization induced by nonlinear extension of plastic zones in the rock pillar. Seepage flow emerges in the rock pillar for preventing water inrush, accompanied by mechanical instability of the rock pillar. Taking the accident of a confined karst cave water-inrush of Qiyi Mine as an example, by studying the safety factor of the rock pillar and the relationship between karst cave water pressure and thickness of the rock pillar,it is proposed that rock pillar thickness with a safety factor equal to 1.5 is regarded as the calculated safety thickness of the rock pillar, which should be equal to the sum of the blasthole depth, blasting disturbance depth and the calculated safety thickness of the rock pillar. The cause of the karst water inrush at Qiyi Mine is that the rock pillar was so small that it did not possess a safety margin. Combining fluid–solid coupling theory, catastrophic theory and strength reduction method to study the nonlinear mechanical response of complicated rock engineering, new avenues for quantitative analysis of rock engineering stability evaluation should be forthcoming. 展开更多
关键词 Rock mechanics Catastrophic theory Shear strength reduction method Karst water inrush Safety factor
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Discrete dislocation plasticity analysis of dispersion strengthening in oxide dispersion strengthened(ODS) steels 被引量:1
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作者 Akiyuki Takahashi Shota Sato 《Journal of Central South University》 SCIE EI CAS 2014年第4期1249-1255,共7页
A discrete dislocation plasticity analysis of dispersion strengthening in oxide dispersion strengthened(ODS) steels was described. Parametric dislocation dynamics(PDD) simulation of the interaction between an edge dis... A discrete dislocation plasticity analysis of dispersion strengthening in oxide dispersion strengthened(ODS) steels was described. Parametric dislocation dynamics(PDD) simulation of the interaction between an edge dislocation and randomly distributed spherical dispersoids(Y2O3) in bcc iron was performed for measuring the influence of the dispersoid distribution on the critical resolved shear stress(CRSS). The dispersoid distribution was made using a method mimicking the Ostwald growth mechanism. Then, an edge dislocation was introduced, and was moved under a constant shear stress condition. The CRSS was extracted from the result of dislocation velocity under constant shear stress using the mobility(linear) relationship between the shear stress and the dislocation velocity. The results suggest that the dispersoid distribution gives a significant influence to the CRSS, and the influence of dislocation dipole, which forms just before finishing up the Orowan looping mechanism, is substantial in determining the CRSS, especially for the interaction with small dispersoids. Therefore, the well-known Orowan equation for determining the CRSS cannot give an accurate estimation, because the influence of the dislocation dipole in the process of the Orowan looping mechanism is not accounted for in the equation. 展开更多
关键词 parametric dislocation dynamics oxide dispersion strengthened steel Orowan mechanism critical resolved shear stress dislocation dipole
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Investigation of the Process Parameters on the Blanking of AISI 304 Stainless Steel by Using Finite Element Method 被引量:1
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作者 Kaan Emre Engin Omer Eyercioglu 《Journal of Mechanics Engineering and Automation》 2016年第7期356-363,共8页
Blanking is a major process and has a wide range of usage in manufacturing industry. The general concept of blanking seems a simple one but governing parameters are many and have a complex relationship which directly ... Blanking is a major process and has a wide range of usage in manufacturing industry. The general concept of blanking seems a simple one but governing parameters are many and have a complex relationship which directly affect the quality of the produced parts (blanks) and also the energy efficiency of the process. The main problem is the lack of prediction capabilities of the effect of these parameters that lead to time, money and labor consuming trial and error procedures in experimental studies. Usage of FEM based programs to simulate blanking to obtain numerical results and observe the shearing mechanism is a cheap and a detailed way for industrial applications. In this study five different clearances (1%, 3%, 5%, 10% and 20%) and three different thicknesses (t = 2 mm, t = 3 mm and t = 4 mm) were used for simulation and experimental studies of the blanking process. Simulations were executed by using the FEM program, Deform 2-D. Investigations were made on the parameters related to crack progression like crack initiation and crack propagation angles, indentation angle, rollover angle and depth and also the related blanking energy values. The results of the present paper are in agreement with the results of experimental studies. 展开更多
关键词 Blanking process sheet metal process parameters shearing mechanisms.
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The aggregation characteristics and formation mechanism of nanoparticles in ductile shear zone 被引量:1
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作者 CAI Zhourong HUANG Qiangtai +2 位作者 LI Jianfeng XIANG Junyang LU Lijuan 《Acta Geologica Sinica(English Edition)》 SCIE CAS CSCD 2017年第S1期263-264,共2页
1 Introduction Nanoparticles are widely found in the ductile shear zone and it is considered to have a close relation with faulting.The sizes of these nanoparticles are generallyless than 100 nm.They have a variety of... 1 Introduction Nanoparticles are widely found in the ductile shear zone and it is considered to have a close relation with faulting.The sizes of these nanoparticles are generallyless than 100 nm.They have a variety of morphologies like globular structure rod-like and tubular,by the order aggregating of these nanoparticles various aggregations 展开更多
关键词 The aggregation characteristics and formation mechanism of nanoparticles in ductile shear zone
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Elastoplastic cup model for cement-based materials
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作者 Yan ZHANG Jian-fu SHAO 《Water Science and Engineering》 EI CAS 2010年第1期102-112,共11页
Based on experimental data obtained from triaxial tests and a hydrostatic test, a cup model was formulated. Two plastic mechanisms, respectively a deviatoric shearing and a pore collapse, are taken into account. This ... Based on experimental data obtained from triaxial tests and a hydrostatic test, a cup model was formulated. Two plastic mechanisms, respectively a deviatoric shearing and a pore collapse, are taken into account. This model also considers the influence of confining pressure. In this paper, the calibration of the model is detailed and numerical simulations of the main mechanical behavior of cement paste over a large range of stress are described, showing good agreement with experimental results. The ease study shows that this cup model has extensive applicability for cement-based materials and other quasi-brittle and high-porosity materials in a complex stress state. 展开更多
关键词 cup model cement-based materials plastic shearing mechanism plastic porecollapse mechanism numerical simulation
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Magnetic Dipole Band in ^(113)In
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作者 马克岩 杨东 +13 位作者 陆景彬 王烈林 王辉东 刘运祚 刘弓冶 李黎 马英君 杨森 刘珊 竺礼华 吴晓光 李广生 贺创业 李雪琴 《Plasma Science and Technology》 SCIE EI CAS CSCD 2012年第5期399-401,共3页
High spin states in the odd-A nucleus 113^In have been investigated using the re- action 110^Pd(7^Li, 4n) at a beam energy of 50 MeV. A new positive parity dipole band with the configuration of π(g9/2)^-lv(h11/2... High spin states in the odd-A nucleus 113^In have been investigated using the re- action 110^Pd(7^Li, 4n) at a beam energy of 50 MeV. A new positive parity dipole band with the configuration of π(g9/2)^-lv(h11/2)^2 v (g7/2)^2 is established. The effective interaction V(θ) values of this band have been successfully described by a semiclassical geometric model based on shear mechanism, which show that the dipole band has the characteristics of magnetic rotation. In addition the collective rotational angular momentum for this band is extracted. The results show that the core contribution increases gradually with the increase of the rotation frequency. 展开更多
关键词 high spin state effective interaction shear mechanism collective rotationalangular momentum
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Microstructure and Shear Properties Evolution of Minor Fe-Doped SAC/Cu Substrate Solder Joint under Isothermal Aging
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作者 Quanzhen Li Chengming Li +5 位作者 Xiaojing Wang Shanshan Cai Jubo Peng Shujin Chen Jiajun Wang Xiaohong Yuan 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 2024年第7期1279-1290,共12页
Different amounts of Fe(0.005,0.01,0.03,0.05,and 0.07 wt%)were added to SAC305 to study the shear behavior damage of Fe-doped SAC solder joints under thermal loading(170℃,holding time of 0,250,500,and 750 h).The resu... Different amounts of Fe(0.005,0.01,0.03,0.05,and 0.07 wt%)were added to SAC305 to study the shear behavior damage of Fe-doped SAC solder joints under thermal loading(170℃,holding time of 0,250,500,and 750 h).The results show that during isothermal aging at 170℃,the average shear force of all solder joints decreases with increasing aging time,while the average fracture energy first increases and then decreases,reaching a maximum at 500 h.Minor Fe doping could both increase shear forces and related fracture energy,with the optimum Fe doping amount being 0.03 wt%within the entire aging range.This is because the doping Fe reduces the undercooling of the SAC305 alloy,resulting in the microstructure refining of solder joints.This in turn causes the microstructure changing from network structure(SAC305 joint:eutectic network+β-Sn)to a single matrix structure(0.03Fe-doped SAC305 joint:β-Sn matrix+small compound particles).Specifically,Fe atoms can replace some Cu in Cu_(6)Sn_(5)(both inside the solder joint and at the interface),and then form(Cu,Fe)_(6)Sn_(5) compounds,resulting in an increase in the elastic modulus and nanohardness of the compounds.Moreover,the growth of Cu_(6)Sn_(5) and Cu_(3)Sn intermetallic compounds(IMC)layer are inhibited by Fe doping even after the aging time prolonging,and Fe aggregates near the interface compound to form FeSn_(2).This study is of great significance for controlling the growth of interfacial compounds,stabilizing the microstructures,and providing strengthening strategy for solder joint alloy design. 展开更多
关键词 SAC305 solder Fe doping Shear mechanical behavior Isothermal aging Interfacial intermetallic compounds(IMC)
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Microstructure and shear properties evolution of Mn-doped SAC solder joint under isothermal aging
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作者 Cheng-ming Li Shu-jin Chen +3 位作者 Shan-shan Cai Ju-bo Peng Xiao-jing Wang Ying-wu Wang 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2023年第8期1650-1660,共11页
The effects of Mn addition(0.005,0.01,0.03,0.05,and 0.07 wt.%)on microstructure,shear mechanical behavior,and interfacial thermal stabilities of SAC305 joints were investigated under isothermal aging temperatures of 1... The effects of Mn addition(0.005,0.01,0.03,0.05,and 0.07 wt.%)on microstructure,shear mechanical behavior,and interfacial thermal stabilities of SAC305 joints were investigated under isothermal aging temperatures of 170 C with different aging time(0,250,500,and 750 h).It is found that Mn addition can increase fracture energy of joints without decreasing the shear strength.And the microstructures have transformed from the eutectic net-like structure in SAC305 solder joints into the structures based onβ-Sn matrix with intermetallic compounds(IMCs)distributed.By doping 0.07 wt.%Mn,the Cu_(6)Sn_(5) growth along the SAC305/Cu interface during thermal aging can be inhibited to some extent.During isothermal aging at 170°C,the maximum shear force of solder joint decreases continuously with aging time increasing,while the fracture energy rises first and then decreases,reaching the maximum at 500 h compared by that with the microstructure homogenization.Cu_(3)Sn growth between Cu_(3)Sn_(5)/Cu interface has been retarded most at the aging time of 250 h with 0.07 wt.%Mn-doped joints.With the aging time prolonging,the inhibition effect of Mn on CusSn IMC layer becomes worse.The strengthening effect of Mn can be explained by precipitation strengthening,and its mechanical behavior can be predicted by particle strengthening model proposed by Orowan. 展开更多
关键词 SAC305 solder Mn doping Shear mechanical behavior Isothermal aging Interfacial intermetallic compound
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Non-equilibrium alloy phase formation and transformation driven by ion beam mixing in the Fe-Hf-Nb multilayers 被引量:2
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作者 LI Nan WANG TongLe +3 位作者 DING Ning DAI Ye BAI Xue LIU BaiXin 《Science China(Technological Sciences)》 SCIE EI CAS 2012年第3期640-645,共6页
In the ion beam mixing experiments,eight Fe-Hf-Nb multilayered films,with overall compositions of Fe67Hf22Nb11,Fe67Hf11Nb22,Fe54Hf38Nb8,Fe54Hf30Nb16,Fe54Hf11Nb35,Fe25Hf67Nb8,Fe25Hf50Nb25 and Fe25Hf11Nb64,were irradiat... In the ion beam mixing experiments,eight Fe-Hf-Nb multilayered films,with overall compositions of Fe67Hf22Nb11,Fe67Hf11Nb22,Fe54Hf38Nb8,Fe54Hf30Nb16,Fe54Hf11Nb35,Fe25Hf67Nb8,Fe25Hf50Nb25 and Fe25Hf11Nb64,were irradiated by 200 keV xenon ions to doses ranging from 3×1014 Xe+/cm2 to 7×1015 Xe+/cm2.The results showed that unique amorphous phases were obtained at designed alloy compositions,falling in the favored glass-forming region deduced from three binary metal sub-systems.Interestingly,at some alloy compositions,the crystal-amorphous-crystal transformations were observed back and forth while varying the irradiation doses.In addition,at the alloy composition of Fe25Hf67Nb8,a metastable FCC phase was formed through an HCP-FCC structural phase transformation and it had a large lattice constant identified to be a=4.51 .Besides,the formation mechanism of non-equilibrium alloy phases was also discussed in terms of thermodynamics of solids and atomic collision theory. 展开更多
关键词 phase transformation ion beam mixing amorphous phase Fe-Hf-Nb system shearing mechanism
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Analytical Solution for Predicting In-plane Elastic Shear Properties of 2D Orthogonal PWF Composites 被引量:2
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作者 CHENG Xu XIONG Junjiang BAI Jiangbo 《Chinese Journal of Aeronautics》 SCIE EI CSCD 2012年第4期575-583,共9页
This paper proposes a new analytical solution to predict the shear modulus of a two-dimensional(2D) plain weave fabric(PWF) composite accounting for the interaction of orthogonal interlacing strands with coupled s... This paper proposes a new analytical solution to predict the shear modulus of a two-dimensional(2D) plain weave fabric(PWF) composite accounting for the interaction of orthogonal interlacing strands with coupled shear deformation modes including not only relative bending but also torsion,etc.The two orthogonal yarns in a micromechanical unit cell are idealized as curved beams with a path depicted by using sinusoidal shape functions.The internal forces and macroscopic deformations carried by the yarn families,together with macroscopic shear modulus of PWFs are derived by means of a strain energy approach founded on micromechanics.Three sets of experimental data pertinent to three kinds of 2D orthogonal PWF composites have been implemented to validate the new model.The calculations from the new model are also compared with those by using two models in the earlier literature.It is shown that the experimental results correlate well with predictions from the new model. 展开更多
关键词 textile composites mechanical properties shear modulus properties plain weave fabric
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Study of magnetic-rotation in ^(82)Rb byg-factor measurements
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作者 袁大庆 郑永男 +10 位作者 左翼 范平 周冬梅 刘猛 吴晓光 竺礼华 李广生 许国基 樊启文 张锡珍 朱升云 《Chinese Physics C》 SCIE CAS CSCD 2009年第S1期188-190,共3页
Magnetic rotation in 82Rb has been investigated for the first time by g-factor measurement of intra-band states of the magnetic-rotational band built on the 11- state. The g-factors were measured by a TMF-IMPAD method... Magnetic rotation in 82Rb has been investigated for the first time by g-factor measurement of intra-band states of the magnetic-rotational band built on the 11- state. The g-factors were measured by a TMF-IMPAD method and calculated by a semi-classical model of independent particle angular momentum coupling assumption. The g-factors and deduced shears angles decrease with the increasing of spin along the band, illustrating a step-by-step alignment of the valence protons and neutrons. The rapid alignment of the valence neutrons leads to a decrease of g-factors. The present results vividly reveal the shears mechanism of magnetic rotation. 展开更多
关键词 82Rb magnetic rotation shears mechanism G-FACTOR
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Shears mechanism in two-dimensional cranking relativistic mean field approach
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作者 彭婧 邢丽峰 孟杰 《Chinese Physics C》 SCIE CAS CSCD 2009年第S1期15-17,共3页
Using the new two-dimensional cranking relativistic mean field (RMF) approach, the shears mechanism of magnetic rotation based on configuration πh121/2νh-211/2 in 142Gd is microscopically and self-consistently exami... Using the new two-dimensional cranking relativistic mean field (RMF) approach, the shears mechanism of magnetic rotation based on configuration πh121/2νh-211/2 in 142Gd is microscopically and self-consistently examined by investigating the aligning angular momenta of the valence nucleons. 展开更多
关键词 magnetic rotation relativistic mean field shears mechanism
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