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Significant Influence on Residual Bending Strength by Cracks Generation During Grinding of Ceramics 认领 引用
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作者 Jinshuo Zhang Tianyi Sui +3 位作者 Bin Lin Bingrui Lv Jingming Li Jingguo Zhou 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2025年第2期60-83,共24页
Any product must undergo precise manufacturing before use.The damage incurred during the manufacturing process can significantly impact the residual strength of the product post-manufacturing.However,the relationship ... Any product must undergo precise manufacturing before use.The damage incurred during the manufacturing process can significantly impact the residual strength of the product post-manufacturing.However,the relationship between residual bending strength and manufacturing-induced damage remains unclear,despite being a crucial parameter for assessing material service life and performance,leading to a decrease in product performance reliability.This study focuses on investigating the impact of crack generation on residual bending strength through theoretical and experimental analyses of scratching,grinding,and three-point bending.The research first elucidates the forms and mechanisms of material damage through scratch experiments.Subsequently,using resin-bonded and electroplated wheels as case studies,the influence of different process parameters on grinding damage and residual bending strength is explored.The reduction of brittle removal can lead to a 50%–60%decrease in residual bending strength.Lastly,a model is developed to delineate the relationship between processing parameters and the residual bending strength of the product,with the model exhibiting an error margin of less than 11%.This model clearly reveals the effect of crack generation under different process parameters on residual flexural strength. 展开更多
关键词 Hot isostatic pressing sinter Si3N4 Scratching Grinding Residual bending strength
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Relationships among Preparative Technique,Phase Composition and Bending Strength of Bauxite Porcelain 认领 引用 被引量：3
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作者 任强 武秀兰 +1 位作者 何选盟 朱振峰 《Chinese Journal of Structural Chemistry》 SCIE CAS 北大核心 2007年第1期79-83,共5页
Bauxite porcelain can be sintered to make its bending strength reach 179Mpa by using sintered bauxite, clay and potash feldspar and albite as the main raw materials in oxidation atmosphere under the normal pressure. X... Bauxite porcelain can be sintered to make its bending strength reach 179Mpa by using sintered bauxite, clay and potash feldspar and albite as the main raw materials in oxidation atmosphere under the normal pressure. XRD, SEM and so on are utilized to study the relationships between factors like the composition of ingot, reduction particle size and heat insulating time at sintering temperature and the phase composition, microstructure and bending strength of ceramic body. The results show that the main phases in bauxite porcelain are corundum, mullite and glass, and the mullite is composed of two parts： primary mullite formed by clay conversion and secondary mullite whiskers precipitating from high temperature melt. The bending strength of ceramic body can be improved by enhancing the content of sintered bauxite in the formula： the smaller the particle size of the ceramic body is, the higher the bending strength will be. The high-temperature heat insulating technique is beneficial to the precipitation of certain quantitative secondary mullite whiskers so as to remarkably improve the strength of glass phase and ceramic body. 展开更多
关键词 bauxite porcelain mirocstructure mullite whiskers bending strength
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Construction of continuous heat conductive channel,a double harvest strategy to enhance thermal conductance and bending strength of C/SiC composites 认领 引用 被引量：1
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作者 Yunhai Zhang Yongsheng Liu +4 位作者 Liyang Cao Xutong Zheng Yejie Cao Jing Wang Qing Zhang 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2022年第10期101-108,共8页
The development of efficient and quick method to prepare structure-function integrative C/SiC composites is always a major challenge in this feld.Herein,the thermal conductivity and bending strength of C/SiC composite... The development of efficient and quick method to prepare structure-function integrative C/SiC composites is always a major challenge in this feld.Herein,the thermal conductivity and bending strength of C/SiC composites were enhanced simultaneously via continuous high heat conductive channels constructed by continuous wave laser machining and pitch-based high thermal conductivity carbon fber in thickness direction.Results revealed that the thermal conductivity of the modifed C/SiC composites is three times higher than that of referential C/SiC composites due to its highly ordered heat conducive channel in the thickness direction.Importantly,the bending strength of modifed C/SiC composites increased to 457MPa.To better understand the enhance mechanism,the micro-structure for both the composites and heat conductive channel was systematically analyzed.The results demonstrated that the rivet effect of heat conductive channel and the formed two phases structure on the fbers dispersed partial of load and fnally enhanced the property of the composites.In a word,this method holds a nice applicable future in constructing structure-function integrative C/SiC composites. 展开更多
关键词 C/SiC composites Structure-function integrative Thermal conductivity Bending strength Heat conductive channel
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Springback prediction of thick-walled high-strength titanium tube bending 认领 引用 被引量：19
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作者 Song Feifei Yang He +2 位作者 Li Heng Zhan Mei Li Guangjun 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2013年第5期1336-1345,共10页
Significant springback occurs after tube rotary-draw-bending （RDB）, especially for a high-strength Ti-3A1-2.5V tube （HSTT） due to its high ratio of yield strength to Young＇s modulus. The combination scheme of exp... Significant springback occurs after tube rotary-draw-bending （RDB）, especially for a high-strength Ti-3A1-2.5V tube （HSTT） due to its high ratio of yield strength to Young＇s modulus. The combination scheme of explicit and implicit is preferred to predict the springback. This simulation strategy includes several numerical parameters, such as element type, number of elements through thickness （NEL）, element size, etc. However, the influences of these parameters on spring- back prediction accuracy are not fully understood. Thus, taking the geometrical specification 9.525 mm × 0.508 mm ofa HSTT as the objective, the effects of numerical parameters on prediction accuracy and computation efficiency of springback simulation of HSTT RDB are investigated. The simulated springback results are compared with experimental ones. The main results are： （1） solid and continuum-shell elements predict the experimental results well; （2） for C3DSR elements, NEL of at least 3 is required to obtain reliable results and a relative error of 29% can occur as NEL is varied in the range of 1-3; （3） specifying damping factor typically works well in Abaqus/Emplicit simulation of springback and the springback results are sensitive to the magnitude of damping factor. In addition, the explanations of the effect rules are given and a guideline is added. 展开更多
关键词 Bending Finite element method High strength Numerical parameters Solid elements Springback Titanium alloys Tube
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The Influence of Mineral Admixtures on Bending Strength of Mortar on the Premise of Equal Compressive Strength 认领 引用
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作者 WANG Qiang YAN Peiyu FENG Jianwen 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2012年第3期586-589,共4页
The influence of mineral admixtures on bending strength of mortar on the premise of equal compressive strength was investigated.Three mineral admixtures(fly ash,ground granulated blast-furnace slag and steel slag)were... The influence of mineral admixtures on bending strength of mortar on the premise of equal compressive strength was investigated.Three mineral admixtures(fly ash,ground granulated blast-furnace slag and steel slag)were used.The adding amount of mineral admixture in this study ranges from 22.5%to 60%,and the water-to-binder ratio ranges from 0.34 to 0.50.With equal compressive strength,different mortars can be arranged in such a descending order with their bending strength:cement-fly ash mortar,cement mortar,cement-GGBS mortar,and cement-steel slag mortar.With the same compressive strength,the higher the steel slag content and water-to-binder ratio,the lower the bending strength of mortars.However,the effect of mineral mixture content and water-to-binder ratio on the bending strength of cement-fly ash mortar and cement-GGBS mortar is far inconspicuous. 展开更多
关键词 mineral admixtures bending strength compressive strength
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SIZE EFFECT ON THE BENDING AND TENSILE STRENGTH OF MICROMACHINED POLYSILICON FILMS FOR MEMS 认领 引用
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作者 DingJianning YangJichang WenShizhu 《Acta Mechanica Solida Sinica》 SCIE 2004年第3期203-208,共6页
The bending strength of microfabricated polysilicon beams was measured by beam bending using a nanoindenter. Also, the tensile strength of microfabricated polysilicon thin ?lms was measured by tensile testing with a n... The bending strength of microfabricated polysilicon beams was measured by beam bending using a nanoindenter. Also, the tensile strength of microfabricated polysilicon thin ?lms was measured by tensile testing with a new microtensile test device. It was found that the bending strength and tensile strength of polysilicon microstructures exerts size e?ect on the size of the specimens. In such cases, the size e?ect can be traced back to the ratio of surface area to volume as the governing parameter. A statistical analysis of the bending strength for various specimen sizes shows that the average bending strength of polysilicon microcantilever beams is 2.885 ± 0.408 GPa. The measured average value of Young’s modulus, 164 ± 1.2 GPa, falls within the theoretical bounds. The average fracture tensile strength is 1.36 GPa with a standard deviation of 0.14 GPa, and the Weibull modulus is 10.4 -11.7, respectively. The tensile testing of 40 specimens on failure results in a recommendation for design that the nominal strain be maintained below 0.0057. 展开更多
关键词 polysilicon bending strength tensile strength strain analysis
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Numerical Simulation on Dynamic Bending Strength of Three-Graded Concrete Beam Based on Meso-Mechanics 认领 引用
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作者 田瑞俊 杜修力 彭一江 《Transactions of Tianjin University》 EI CAS 2008年第5期371-375,共5页
To study the bending strength of mass concrete under dynamic loading, the pure bending zone of three-graded concrete beam is considered as a three-phase composite composed of matrix, aggregate and interface between th... To study the bending strength of mass concrete under dynamic loading, the pure bending zone of three-graded concrete beam is considered as a three-phase composite composed of matrix, aggregate and interface between them on meso-level. Dynamic constitutive model considering strain-rate strengthening effect and damage softening effect is adopted to describe the cocrete and meso-element's damage. The failure mechanisms of beam under impact loading, triagle wave load, dynamic load coupling with initial static loading were simulated by using displacement-controlled FEM. Furthermore, stress-strain curve of the specimens and their dynamic bending strength were obtained. The results obtained from numerical simulation agreed well with experimental data. 展开更多
关键词 concrete beam meso-mechanics dynamic bending strength numerical simulation
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Interfacial reactions and bending strength of SiC/A356/FeNi50 composite fabricated by gas pressure infiltration 认领 引用 被引量：4
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作者 马春雪 于家康 +1 位作者 薛晨 张志庆 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2013年第8期2229-2235,共7页
The SiC/A356/FeNi50 composite was fabricated by gas pressure infiltration. The interfacial region of the SiC/A356/FeNi50 composite consisted of FeNi50 reaction layer, A1 reaction layer and A1 alloy matrix. The main in... The SiC/A356/FeNi50 composite was fabricated by gas pressure infiltration. The interfacial region of the SiC/A356/FeNi50 composite consisted of FeNi50 reaction layer, A1 reaction layer and A1 alloy matrix. The main intermetallic compounds were （Fe,Ni）a（A1,Sih3 and （Fe,Ni）2（A1,Si）5 at the A1 reaction layer and FeNi50 reaction layer, respectively. The bending behavior versus different infiltration temperatures and holding times was also investigated. The bending strength at 670 ~C was the highest and close to the bending strength of A1 alloy （223 MPa）, and 46% of SIC/A356. The brittle intermetallic compounds existing at the interface induced the decreasing of the bending strength. The pores were reduced by adequate heating time due to the homogeneous temperature of preform, which was beneficial to improve the bending strength of the composite. 展开更多
关键词 infiltration metal matrix composites bending strength interracial reactions
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Bending strength and fracture surface topography of natural fiber-reinforced shell for investment casting process 认领 引用 被引量：4
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作者 Kai Lü Xiang-dong Liu +1 位作者 Zhao-xin Du Yan-fen Li 《China Foundry》 SCIE CAS 2016年第3期211-216,共6页
In order to improve the properties of silica sol shell for investment casting process, various contents of cattail fibers were added into the slurry to prepare a fiber-reinforced shell in the present study. The bendin... In order to improve the properties of silica sol shell for investment casting process, various contents of cattail fibers were added into the slurry to prepare a fiber-reinforced shell in the present study. The bending strength of fiber-reinforced shell was investigated and the fracture surfaces of shell specimens were observed using SEM. It is found that the bending strength increases with the increase of fiber content, and the bending strength of a green shell with 1.0 wt.% fiber addition increases by 44% compared to the fiber-free shell. The failure of specimens of the fiber-reinforced green shell results from fiber rupture and debonding between the interface of fibers and adhesive under the bending load. The micro-crack propagation in the matrix is inhibited by the micro-holes for ablation of f ibers in specimens of the f iber-reinforced shell during the stage of being fired. As a result, the bending strength of specimens of the fired shell had no significant drop. Particularly, the bending strength of specimens of the fired shell reinforced with 0.6wt.% fiber reached the maximum value of 4.6 MPa. 展开更多
关键词 fiber-reinforced shell investment casting bending strength fracture surface topography
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Bending Strength of Glass Materials under Strong Dynamic Impact and Its Strain Rate Effects 认领 引用 被引量：2
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作者 LIU Xiaogen QI Shuang +2 位作者 WEI Shaoshan WAN Detian JIN Chunxia 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS CSCD 2024年第6期1358-1364,共7页
Based on the structural characteristics of the high-speed loading tester,a four-point bending test device was designed to carry out the four-point bending strength test of glass under the action of static load and dif... Based on the structural characteristics of the high-speed loading tester,a four-point bending test device was designed to carry out the four-point bending strength test of glass under the action of static load and different impact velocities,and the formulae for calculating the maximum dynamic stress and strain rate of glass specimens under the action of impact loads were derived.The experimental results show that the bending strength values of the glass under dynamic impact loading are all higher than those under static loading.With the increase of impact speed,the bending strength value of glass specimens generally tends to increase,and the bending strength value increases more obviously when the impact speed exceeds 0.5 m/s or higher.By increasing the impact velocity,higher tensile strain rate of glass specimens can be obtained because the load action time becomes shorter.The bending strength of the glass material increases with its tensile strain rate,and when the tensile strain rate is between 0 and 2 s-1,the bending strength of the glass specimen grows more obviously with the strain rate,indicating that the glass bending strength is particularly sensitive to the tensile strain rate in this interval.As the strain rate increases,the number of cracks formed after glass breakage increases significantly,thus requiring more energy to drive the crack formation and expansion,and showing the strain rate effect of bending strength at the macroscopic level.The results of the study can provide a reference for the load bearing and structural design of glass materials under dynamic loading. 展开更多
关键词 glass materials strong dynamic impact bending strength strain rate effect dynamic enhancement factor
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Bending Strength and Fracture Behavior of Ni50Mn29Ga21 Alloy with Terbium 认领 引用 被引量：1
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作者 ZHAOZeng-qi XIONGWei +1 位作者 WUShuang-xia WANGXin-lin 《Journal of Iron and Steel Research International》 SCIE CAS 2004年第5期55-58,共4页
The bending strength and fracture behaviors of Ni50Mn29Ga21 alloy with terbium were investigated.The results show that the bending strength of the alloy is increased dramatically with the increase of terbium content.T... The bending strength and fracture behaviors of Ni50Mn29Ga21 alloy with terbium were investigated.The results show that the bending strength of the alloy is increased dramatically with the increase of terbium content.The fracture appearance of the sample without terbium is dominated by grain boundary fracture,while that with terbium is dominated by cleavage fracture with the increase of terbium content.Moreover,the grains are refined obviously and the oxygen content is decreased after adding terbium. 展开更多
关键词 Ni50Mn29Ga21 bending strength fracture terbium
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Influence of Characteristics on Bending Strength of Layered Steel Fiber Reinforced Concrete 认领 引用 被引量：6
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作者 DAI Shao-bin SONG Ming-hai HUANG Jun 《Wuhan University Journal of Natural Sciences》 EI CAS 2005年第5期883-886,共4页
The influence of two main characteristics of steel fiber, the aspect ratio （Df） and volume fraction （ρf）, on the bending strength of Layered Steel Fiber Reinforced Concrete （LSFRC） is investigated by using orth... The influence of two main characteristics of steel fiber, the aspect ratio （Df） and volume fraction （ρf）, on the bending strength of Layered Steel Fiber Reinforced Concrete （LSFRC） is investigated by using orthogonal test. Via the variance analysis on the experimental results and trend analysis on the two characteristics, Df is found significantly related to the bending strength of LSFRC. The influence ratio is 63.3%. The bending strength of LSFRC increases if Df increases, makes better when Df reaches 100. ρf has ordinary influence on the bending strength of LSFRC. The influence ratio is 29.2%. Other characteristics, such as the shape of steel fiber and the mix proportion, have less influence. The best ρf contributing to the bending strength of LSFRC is 1.5 %. If ρf is greater than 1.5%, it has negative influence on the bending strength of LSFRC. So, ρf makes a limited contribution to the bending strength of LSFRC. 展开更多
关键词 LSFRC bending strength orthogonal test influence ratio
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Experimental study on the causes of cracking of high-strength steel during bending 认领 引用
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作者 LIU Gang YU Tongwen +2 位作者 ZHANG Lihui WEN Donghui YANG Ana 《Baosteel Technical Research》 EI CAS 2014年第2期31-35,共5页
This paper studies the chemical composition, tensile properties, inclusions, metallogrophic structure, and other such parameters to identify the causes of cracking during the bending of high-strength steel. The result... This paper studies the chemical composition, tensile properties, inclusions, metallogrophic structure, and other such parameters to identify the causes of cracking during the bending of high-strength steel. The results show that the major causes of cracking are the original transverse cracks or holes on the surface of the slab and the presence of scales rolled into the cracks or holes. Cold fracturing from such defects is rare, and can be eleminated by enhancing the control of the steelmaking process and by mechanical clean-up of the surface cracks and holes in the slab. 展开更多
关键词 bending cracking high-strength steel inclusions oxide
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The Relationship of Microstructure, Density and Bending Strength Properties of Blighia sapida 认领 引用
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作者 Gladys A. Quartey 《Journal of Materials Science and Chemical Engineering》 2022年第5期29-39,共11页
Wood anatomical structures of various tree species help identify the wood. The characteristics and composition of these structures affect their utilisation. In this work, the microstructure of Blighia sapida a lesser-... Wood anatomical structures of various tree species help identify the wood. The characteristics and composition of these structures affect their utilisation. In this work, the microstructure of Blighia sapida a lesser-known Ghanaian hardwood species using light microscope and scanning electron microscope (SEM) was studied. The relationship between the microstructure and some physical properties such as density, and bending strength were also studied. The anatomical features studied were fibre length, double fibre wall thickness, fibre proportion, vessel diameter and proportion, rays and axial parenchyma proportions. It was observed that the use of SEM in studying the anatomical or ultra-structural aspects of wood gives a clearer understanding of the features and structures found in wood. Anatomical features such as presence of crystals and absence of axial parenchyma in Blighia sapida are reported in the work. The study also established that Blighia sapida had a low water uptake even though it had vessel distribution of 12 vessels/mm2. Having not very distinct axial parenchyma may have accounted for the low water uptake. The presence of occluded pits could also account for the low water uptake and the fibre wall thickness may also account for a medium bending strength of 62.8 N/mm2 at 12% moisture content. 展开更多
关键词 Microstructure Blighia sapida Scanning Electron Microscope Fibre Length Axial Parenchyma Density Bending Strength Absorption
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EFFECT OF CORROSION ON BOND BEHAVIOR AND BENDING STRENGTH OF REINFORCED CONCRETE BEAMS 认领 引用
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作者 JIN Wei-liang ZHAO Yu-xi 《Journal of Zhejiang University Science》 2001年第3期59-69,共11页
There is growing concern for corrosion damage in reinforced concrete structures with several decades’ service. Pullout tests and beam tests were carried out to study the effect of reinforcement corrosion on the bond ... There is growing concern for corrosion damage in reinforced concrete structures with several decades’ service. Pullout tests and beam tests were carried out to study the effect of reinforcement corrosion on the bond behavior and bending strength of reinforced concrete beams. The bond strength of plain bars and concrete initially increases with increasing corrosion, then declines. The turning point depends on the cracking of the concrete cover. The bond strength of deformed bars and concrete increases with corrosion up to a certain amount, but with progressive increase in corrosion, the bond strength decreases, and the cracking of the concrete cover seems to have no effect on the bond strength. On the basis of test data, the bond strength coefficient recommended here, which, together with the bond strength of uncorroded steel bars and concrete, can be used to easily calculate the bond strength of corroded steel bars and concrete. The bond strength coefficient proposed in this paper can be used to study the bond stress-slip relationship of corroded steel bars and concrete. The bending strength of corroded reinforced concrete beams declines with increasing reinforcement corrosion. Decreased bending strength of corroded RC beam is due to reduction in steel bar cross section, reduction of yield strength of steel bar, and reduction of bond capacity between steel bar and concrete. 展开更多
关键词 reinforced concrete beam corrosion bond behavior bond strength coefficient bending strength coordination coefficient
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Bedding effect on sandstone stability using three-point loading:Implication of Longyou Grottoes caves 认领 引用 被引量：1
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作者 Tie Wang Chengzeng Yan +4 位作者 Hui Guo Yexue Li Shengwei Li Defu Tong Guohua Zhang 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2026年第6期4640-4663,共24页
Weak bedding planes have a negative impact on the mechanical properties of rocks,which greatly affects the stability of underground caves in Longyou Grottoes.In this work,the Weibull-based finite-discrete element meth... Weak bedding planes have a negative impact on the mechanical properties of rocks,which greatly affects the stability of underground caves in Longyou Grottoes.In this work,the Weibull-based finite-discrete element method(FDEM)is utilized to investigate the stability of Longyou bedded sandstone using three-point loading(TPL).Firstly,the input parameters in FDEM are calibrated based on existing laboratory tests.Subsequently,the FDEM model and parameter calibration are validated.Finally,a series of TPL numerical models of bedded sandstones is established.Effects of the bedding strength reduction coefficient(f),orientation(θ)and spacing(s)on the failure characteristics,bending strength(BS),acoustic emission(AE)events,crack number and energy evolution are discussed.Results indicate that the reduction of bedding strength leads to a sharp drop in BS except for a θ of 0°.Crack number decreases quickly as f increases from 0.1 to 0.3,but remains unchanged with further increase of f.The BS decreases first and then increases as θ increases and has the smallest value with an f of 0.1 and θ of 90°.Generally,more shear cracks develop along the bedding plane and make the interlayer peeling with a small f.Besides,s has little effect on fracture morphology,but an initial increase in s leads to a sharp decrease in crack numbers.Additionally,implications of Longyou Grottoes caves are discussed.The results of this study are expected to provide theoretical support for the stability evaluation of Longyou Grottoes and other underground caves composed of bedded sandstone. 展开更多
关键词 Bedded sandstone Bending strength Acoustic emission(AE)events Longyou Grottoes caves Weibull-based finite-discrete element method(FDEM)
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陕北白垩系冻结软岩抗折力学宏微观特性研究 认领 引用 被引量：1
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作者 闫和平 亓兴晗 +1 位作者 徐程 杨玉贵 《中国矿业》 CAS 北大核心 2026年第1期223-231,共9页
针对陕北地区白垩系软岩地层冻结法凿井工程常发生冻结管断裂、外层井壁垮塌等问题,本文以榆横矿区白垩系软岩为研究对象,采用XRD与SEM研究了洛河组中粒砂岩的矿物成分与微观结构特征;开展了白垩系软岩在冻结过程中的核磁共振试验,获得... 针对陕北地区白垩系软岩地层冻结法凿井工程常发生冻结管断裂、外层井壁垮塌等问题,本文以榆横矿区白垩系软岩为研究对象,采用XRD与SEM研究了洛河组中粒砂岩的矿物成分与微观结构特征;开展了白垩系软岩在冻结过程中的核磁共振试验,获得了冻结软岩的孔隙率和孔隙冰含量变化规律;并对不同温度(-5℃、-10℃、-15℃和-20℃)下的冻结软岩进行了抗折力学试验,分析了白垩系冻结软岩的抗折宏观力学特性与断面微观形貌特征。研究结果表明:洛河组中粒砂岩矿物成分以石英、钾长石、钠长石为主,高岭石黏土矿物含量达到18.7%;岩石内部结构由颗粒状矿物堆叠而成,存在较多的连通孔隙、微裂隙及局部孔洞。冻结过程中孔隙冰含量随温度降低先呈现快速升高、后缓慢升高直至平缓的趋势。白垩系冻结软岩抗折强度随温度降低先呈现快速增加、后逐渐平缓的变化趋势;与-5℃抗折强度相比,-10℃、-15℃及-20℃下的抗折强度分别提高了231.2%、288.0%及304.8%。随着温度的降低,洛河组砂岩断裂形态逐渐趋于平直,断裂面表面粗糙度减小。该研究成果对于揭示白垩系软岩地层的冻结过程演化与冻结壁破坏机理具有重要工程意义。 展开更多
关键词 白垩系软岩 力学特性 表面粗糙度 抗折强度 孔隙冰
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GFRP拉挤型材方管及其粘合双管三点弯曲破坏机制 认领 引用 被引量：1
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作者 郝旭龙 李峰 李达 《复合材料学报》 EI CAS CSCD 北大核心 2026年第6期3496-3518,共23页
纤维增强复合材料(FRP)拉挤型材垂直纤维方向力学性能较弱,型材方管在三点弯曲作用下,其直接受载区域成为结构薄弱环节,该区域力学行为复杂。本文以应急桥梁中模块化玻璃纤维增强复合材料(GFRP)桥面板为研究背景,以作为桥面板基本单元... 纤维增强复合材料(FRP)拉挤型材垂直纤维方向力学性能较弱,型材方管在三点弯曲作用下,其直接受载区域成为结构薄弱环节,该区域力学行为复杂。本文以应急桥梁中模块化玻璃纤维增强复合材料(GFRP)桥面板为研究背景,以作为桥面板基本单元组件的GFRP拉挤型材方管为研究对象,制作了3个型材单管和3个粘合双管试件,并开展了三点弯曲试验,结果表明:两种试件极限承载力均由直接受载区域腹板局部承压失效控制,最终失效表现为腹板局部屈曲,腹板粘合对试件局部管截面畸变和损伤发展有一定限制作用,双管试件的单管平均承载力高于单管试件13%。建立了考虑损伤演化的实体有限元模型和直接受载区段简化框架结构有限元模型,分析了结构加载全过程损伤演化行为,结果表明:型材管件损伤发展受截面横向内力主导,管壁的横向层间剪切强度和横向拉伸强度是控制损伤发展的关键因素,拉挤工艺下纤维布层的褶皱是导致上述强度水平较低的主要原因。 展开更多
关键词 拉挤型材 GFRP方管 三点弯曲 局部强度 破坏机制
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Engineering Structure and Strength Design of Reducer Bend under Internal Pressure 认领 引用
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作者 CHEN Sun-Yi CHEN Jin LIU Ceng-dian 《International Journal of Plant Engineering and Management》 2016年第2期93-106,共14页
Standard reducer bends have structural functions of both bend and reducer pipe at the same time. However, there is a lack of strength design method in the current codes. In order to develop the strength design method ... Standard reducer bends have structural functions of both bend and reducer pipe at the same time. However, there is a lack of strength design method in the current codes. In order to develop the strength design method of the reducer bends subjected to internal pressure, analytical formulas are re-examined. Finite element analysis and stress measurements of the reducer bend are carried out. It is found that it is not appropriate to analyze the reducer bends by using thin membrane theory. The formula derived directly from circumferential stress formula of reducer bends under internal pressure is conservative, which is further verified by the finite element analysis results and it can thus be applied to piping design. 展开更多
关键词 strength design stress analysis reducer pipe reducer bends elbows
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波形钢腹板工字钢组合梁极限抗弯承载力计算方法 认领 引用 被引量：1
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作者 邓文琴 查上 +3 位作者 刘朵 张建东 胡楷文 顾建成 《工程力学》 EI CSCD 北大核心 2026年第1期185-195,共11页
波形钢腹板工字钢组合梁集约化程度高、施工便捷、稳定性优异等特点,为了明确该工字钢组合梁抗弯性能,通过某实桥数值模拟揭示了不同荷载工况下波形钢腹板工字钢组合梁的抗弯承载机理,在此基础上采用连续强度法,考虑钢材强化效应、钢混... 波形钢腹板工字钢组合梁集约化程度高、施工便捷、稳定性优异等特点,为了明确该工字钢组合梁抗弯性能,通过某实桥数值模拟揭示了不同荷载工况下波形钢腹板工字钢组合梁的抗弯承载机理,在此基础上采用连续强度法,考虑钢材强化效应、钢混间滑移效应和波形钢腹板抗弯贡献,提出了不同破坏模式下波形钢腹板工字钢组合梁的极限抗弯承载力计算公式,并通过模型试验进行了验证。结果表明:在极限状态下,混凝土桥面板与钢梁上下翼缘应变分布符合平截面假定,波形钢腹板纵向应变沿高度呈线性分布,靠近下翼缘受拉侧已进入钢材受拉强化阶段,腹板抗弯贡献不可忽略不计;剪力连接度对波形钢腹板工字钢组合梁极限抗弯承载力有一定影响,剪力连接度越大,抗弯承载力越大;既有规范对于波形钢腹板工字钢组合梁极限抗弯承载力计算结果过于保守,该文提出的考虑钢材强化效应、钢混间滑移效应和波形钢腹板的贡献的极限抗弯承载力计算方法与试验结果吻合较好,可精准反映波形钢腹板工字钢组合梁抗弯承载力,提高设计计算精度。 展开更多
关键词 工字钢组合梁 极限抗弯承载力 连续强度法 波形钢腹板 钢材强化效应 滑移效应
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