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Influence of Heat Treatment on Hydroformability of TRIP Seamless Steel Tube 认领 引用
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作者 Zi-cheng ZHANG Ken-ichi MANABE 《Journal of Iron and Steel Research International》 SCIE CAS CSCD 2014年第7期695-701,共7页
A low-carbon TRIP seamless steel tube, which is expected to be used in the hydroforming process, was successfully fabricated using piercing, cold-drawing and two-stage heat treatment process. The two-stage heat treatm... A low-carbon TRIP seamless steel tube, which is expected to be used in the hydroforming process, was successfully fabricated using piercing, cold-drawing and two-stage heat treatment process. The two-stage heat treatment is one crucial step because it significantly affects the microstructure and mechanical properties of TRIP seam less steel tube. In order to obtain the TRIP seamless steel tube with high hydroformability, several different heat treatment processes were conducted. The effects of heat treatment conditions （intercritical annealing （IA） and isothermal bainite treatment （IBT）） on the TRIP seamless steel tube hydroformability which was determined by free hydraulic bulge test were analyzed. Two different internal pressure boosting velocities of 0.2 and 0.5 MPa/s of free hydraulic bulge tests were adopted to determine the effective stress vs. effective strain curve of TRIP seamless steel tube. The results showed that for the predetermined IA condition, the maximum bulge height increased, but the maximum burst internal pressure decreased, with the increase of IBT holding time from 4 to 6 rain. For the predetermined IBT condition, the maximum bulge height decreased, but the maximum burst internal pressure increased, with the increase of IA holding time from 5 to 10 rain. By analyzing the free hydraulic bulge test results, it was found that the maximum bulge heights of TRIP seamless steel tubes with the internal pressure boosting velocity of 0.5 MPa/s were higher than those when the internal pressure boosting velocity was 0.2 MPa/s. This means that an appropriate deformation rate should be chosen to obtain the optimal hydroformability of TRIP seamless steel tube. In addition, the effective stress vs. effective strain curves of TRIP seamless steel tubes were ohtained with free hydraulic bulge test. 展开更多
关键词 TRIP steel heat treatment hydroformability seamless tube hydraulic bulge test
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Strengthening mechanism of 2195 Al-Li alloy by thermomechanical treatment based on impact hydroforming loading 认领 引用
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作者 Hong-liang ZHU Yong XU +5 位作者 Wen-long XIE Shi-hong ZHANG Xiu-wen LV Muhammad Farooq SALEEM Artur I.POKROVSKY Boris B.KHINA 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2026年第3期709-726,共18页
A novel method called thermomechanical treatment based on impact hydroforming(TTIHF)was proposed.The pre-deformation was achieved by using impact hydroforming(IHF)loading.The strengthening effect and mechanism of 2195... A novel method called thermomechanical treatment based on impact hydroforming(TTIHF)was proposed.The pre-deformation was achieved by using impact hydroforming(IHF)loading.The strengthening effect and mechanism of 2195 Al-Li alloy were investigated under various loading pre-deformation conditions.The results showed that the time for the alloy to reach peak aging was shortened under TTIHF.Compared with those of the pre-deformation method of stamping forming,the yield strength and tensile strength of the Al-Li alloy under TTIHF increased by 18.6%and 18.0%,respectively.The deformation caused by IHF loading resulted in a high density of dislocations,which served as nucleation sites for the precipitation of the T1phase during aging.After TTIHF,the average diameter and thickness of the T1phase in the alloy were smaller than those under other experiment conditions.Moreover,the density and distribution of the T1phase were the highest and the most uniform. 展开更多
关键词 Al-Li alloy thermomechanical treatment impact hydroforming peak aging strengthening mechanism dislocation density
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Impact hydroforming characteristics for a half-tube part with curvature 认领 引用
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作者 Hongliang ZHU Yong XU +5 位作者 Boris B.KHINA Wenlong XIE Shi-Hong ZHANG Liangliang XIA Mingyu GAO Artur I.POKROVSKY 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2026年第1期626-642,共17页
Taking half-tube part with curvature as an example,the Impact Hydroforming(IHF)characteristics were studied by combining the actual forming experiment and numerical simulation.The IHF experiment showed that wrinkles a... Taking half-tube part with curvature as an example,the Impact Hydroforming(IHF)characteristics were studied by combining the actual forming experiment and numerical simulation.The IHF experiment showed that wrinkles appeared at the bottom of the part during single-step forming,but no wrinkles were observed during double-step forming.The thinning rate and deviation of the wall thickness of the part in each area were less than 20%and 2.7 mm,correspondingly,and the drawing depth of the part reached 45.8 mm.The effect of double-step forming was better than that of single-step forming,which was related to the IHF forming law.Besides,the characteristics of the IHF process were studied by numerical simulation.The results indicated that when double-step forming was utilized,there was almost no velocity field in the opposite direction of deformation after the bottom of the part contacted the die,and the existence of stress state at the bottom would restrain and eliminate the wrinkles.The inertia effect evolved with the driving pressure.Specially,the inertia effect can improve the flow of metal and reduce the deviation of the wall thickness of the part under double-step forming. 展开更多
关键词 Aluminum-lithium alloy Forming characteristics Half-tube part Impact hydroforming Inertia effect
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Single-atom catalysis: Bridging the homo-and heterogeneous catalysis 认领 引用 被引量：30
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作者 Fang Chen Xunzhu Jiang +2 位作者 Leilei Zhang Rui Lang Botao Qiao 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 北大核心 2018年第5期893-898,共6页
Single-atom catalysis,the catalysis by single-atom catalysts(SACs),has attracted considerable attention in recent years as a new frontier in the heterogeneous catalysis field.SACs have the advantages of both homogeneo... Single-atom catalysis,the catalysis by single-atom catalysts(SACs),has attracted considerable attention in recent years as a new frontier in the heterogeneous catalysis field.SACs have the advantages of both homogeneous catalysts(isolated active sites)and heterogeneous catalysts(stable and easy to separate),and are thus predicted to be able to bridge the homo-and heterogeneous catalysis.This prediction was first experimentally demonstrated in 2016.In this mini-review,we summarize the few homogeneous catalysis progresses reported recently where SACs have exhibited promising application:a)Rh/ZnO and Rh/CoO SAC have been used successfully in hydroformylation of olefin of which the activity are comparable to the homogeneous Wilkinson’s catalyst;b)a Pt/Al2O3 SAC has shown excellent performance in hydrosilylation reaction;and c)M-N-C SACs(M=Fe,Co etc.)have been applied in the activation of C–H bonds.All of these examples suggest that fabrication of suitable SACs could provide a new avenue for the heterogenization of homogeneous catalysts.These pioneering works shed new light on the recognition of single-atom catalysis in bridging the homo-and heterogeneous catalysis. 展开更多
关键词 Single-atom catalysis Heterogenization of homogeneous catalysts Hydroformation Hydrosilylation Activation of C–H bonds
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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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Deformation and defects in hydroforming of 5A06 aluminum alloy dome with controllable radial pressure 认领 引用 被引量：7
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作者 徐永超 刘欣 +1 位作者 刘晓晶 苑世剑 《Journal of Central South University》 SCIE EI CAS 2009年第6期887-891,共5页
A new process of hydroforming with controllable radial pressure was proposed to overcome difficulties in the forming of low plastic materials and large height-to-diameter ratio workpieces. A typical 5A06 aluminum allo... A new process of hydroforming with controllable radial pressure was proposed to overcome difficulties in the forming of low plastic materials and large height-to-diameter ratio workpieces. A typical 5A06 aluminum alloy dome was numerically and experimentally investigated. The reasons for typical defects were analyzed under different radial pressures. Effects of radial pressure on the thickness distribution were discussed and optimal radial pressure was determined. It is shown by numerical simulations and experiment that a cup with a drawing ratio of 2.4 is formed by the new process of hydroforming with controllable radial pressure. It is significantly effective for the forming of low plastic materials and large height-to-diameter ratio workpieees. Two typical thinning points exit along the dome wall. With the radial pressure, thinning is decreased effectively at the two points, the dome forming is achieved and thickness distribution is more uniform. 展开更多
关键词 aluminum alloy hydroforming radial pressure fracture thickness
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Wrinkling behavior of magnesium alloy tube in warm hydroforming 认领 引用 被引量：7
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作者 汤泽军 刘钢 +1 位作者 何祝斌 苑世剑 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS 2010年第7期1288-1293,共6页
In tube hydroforming with axial feeding,under the effect of coupled internal pressure and axial stress,wrinkles often occur and affect the forming results.Wrinkling behavior of an AZ31B magnesium alloy tube was experi... In tube hydroforming with axial feeding,under the effect of coupled internal pressure and axial stress,wrinkles often occur and affect the forming results.Wrinkling behavior of an AZ31B magnesium alloy tube was experimentally investigated with different loading paths at different temperatures.Features of wrinkles,including shape,radius and width,were acquired from the experiments,as well as the thickness distribution.Numerical simulations were carried out to reveal the stress state during warm hydroforming,and then the strain history of material at the top and bottom of the wrinkles were analyzed according to the stress tracks and yielding ellipse.Finally,effects of loading paths on expansion ratio limit of warm hydroforming were analyzed.It is verified that at a certain temperature,expansion ratio limit can be increased obviously by applying a proper loading path and realizing enough axial feeding. 展开更多
关键词 warm hydroforming magnesium alloy tube wrinkle internal pressure AZ31B magnesium alloy
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Developments and perspectives on the precision forming processes for ultra-large size integrated components 认领 引用 被引量：41
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作者 Shijian Yuan Xiaobo Fan 《International Journal of Extreme Manufacturing》 SCIE EI CAS 2019年第2期34-51,共18页
In order to meet the requirements of high reliability,long-lifetime and lightweight in a new generation of aerospace,aviation,high-speed train,and energy power equipment,integrated components are urgently needed to re... In order to meet the requirements of high reliability,long-lifetime and lightweight in a new generation of aerospace,aviation,high-speed train,and energy power equipment,integrated components are urgently needed to replace traditional multi-piece,welded components.The applications of integrated components involve in a series of large-size,complex-shaped,highperformance components made of difficult-to-deform materials,which present a huge challenge for forming ultra-large size integrated components.In this paper,the developments and perspectives of several extreme forming technologies are reviewed,including the sheet hydroforming of ultra-large curved components,dieless hydroforming of ellipsoidal shells,radial-axial ring rolling of rings,in situ manufacturing process of flanges,and local isothermal forging of titanium alloy components.The principle and processes for controlling deformation are briefly illustrated.The forming of typical ultra-large size integrated components and industrial applications are introduced,such as the high strength aluminum alloy,3m in diameter,integrated tank dome first formed by using a sheet blank with a thickness the same as the final component,and a 16m diameter,integrated steel ring rolled by using a single billet.The trends for extreme forming of ultra-large size integrated components are discussed with a goal of providing ideas and fundamental guidance for the further development of new forming processes for extreme-size integrated components in the future. 展开更多
关键词 ultra-large size integrated components extreme forming hydroforming radial-axial ring rolling isothermal forging
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Modified MK model combined with ductile fracture criterion and its application in warm hydroforming 认领 引用 被引量：6
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作者 杨希英 郎利辉 +1 位作者 刘康宁 郭禅 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2015年第10期3389-3398,共10页
A modified MK model combined with ductile fracture criterion（DFC-MK model） is proposed to compute the forming limit diagrams（FLDs） of 5A06-O aluminum alloy sheet at different temperatures.The material constant（C... A modified MK model combined with ductile fracture criterion（DFC-MK model） is proposed to compute the forming limit diagrams（FLDs） of 5A06-O aluminum alloy sheet at different temperatures.The material constant（C） of ductile fracture criterion and initial thickness imperfection parameter（f0） at various temperatures are determined by using a new computing method based on wide sheet bending test.The FLDs at 20 and 200 °C are calculated through the DFC-MK model.The DFC-MK model,which includes the influence of through-thickness normal stress,is written into the subroutine VUMAT embedded in Abaqus/ Explicit.The cylindrical cup hydroforming tests are carried out to verify the model.The results show that compared with experimental observations,the predicted FLDs based on DFC-MK model are more accurate than the conventional MK model;the errors between the simulations and experiments in warm hydroforming are 8.23% at 20 °C and 9.24% at 200 °C,which verify the effectiveness of the proposed model. 展开更多
关键词 MK model ductile fracture criteria warm hydroforming through-thickness normal stress
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Formability determination of AZ31B tube for IHPF process at elevated temperature 认领 引用 被引量：4
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作者 林艳丽 何祝斌 +1 位作者 苑世剑 吴佳 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2011年第4期851-856,共6页
Ring hoop tension test and tube bulging test were carried out at elevated temperatures up to 480 ℃to evaluate the formability of AZ31B extruded tube for internal high pressure forming （IHPF） process. The total elon... Ring hoop tension test and tube bulging test were carried out at elevated temperatures up to 480 ℃to evaluate the formability of AZ31B extruded tube for internal high pressure forming （IHPF） process. The total elongation along hoop direction and the maximum expansion ratio （MER） of the tube were obtained. The fracture surface after bursting was also analyzed. The results show that the total elongation along hoop direction and the MER value have a similar changing tendency as the testing temperature increases, which is quite different from the total elongation along axial direction. Both the total elongation along hoop direction and the MER value increase to a peak value at about 160 ℃. After that, they begin to decrease quickly until a certain rebounding temperature is reached. From the rebounding temperature, they begin to increase rapidly again. Burnt structure appears on the fracture surface when tested at temperatures higher than 420 ℃. Therefore, the forming temperature of the tested tube should be lower than 420 ℃, even though bigger formability can be achieved at higher temperature. 展开更多
关键词 AZ31B tube formability hydroforming tube bulging test maximum expansion ratio
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MULTIPOINT BLANK HOLDER FORCE CONTROL IN HYDROFORMING OF FUEL TANK 认领 引用 被引量：4
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作者 WU Yousheng WANG Xinyun +3 位作者 XIA Juchen HU Guoan SUN Yousong YANG Lin 《Chinese Journal of Mechanical Engineering》 EI CAS 2006年第2期200-204,共5页
The study of multipoint blank holder force（BHF） control is carried out for hydroforming a complicated shape motorcycle fuel tank. By finite element method （FEM） simulation, the configuration of multipoint blank ho... The study of multipoint blank holder force（BHF） control is carried out for hydroforming a complicated shape motorcycle fuel tank. By finite element method （FEM） simulation, the configuration of multipoint blank holder cylinders and the setting of local BHF are optimized, and the influences of the multipoint BHF on the hydromechanical deep drawing and conventional hydroforming processes are studied. The desired fluid pressure and whole BHF are predicted for hydromechanical deep drawing process. Finally, simulation results are testified by forming experiment, and they are in agreement very well. 展开更多
关键词 Hydroforming Multipoint blank holder force （BHF） Fuel tank Finite element method （FEM）
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Warm hydroforming of magnesium alloy tube with large expansion ratio 认领 引用 被引量：2
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作者 刘钢 汤泽军 +1 位作者 何祝斌 苑世剑 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS 2010年第11期2071-2075,共5页
Process of warm tube hydroforming was experimentally investigated for forming an AZ31B magnesium alloy tubular part with a large expansion ratio. Effects of temperature on the mechanical properties and formability wer... Process of warm tube hydroforming was experimentally investigated for forming an AZ31B magnesium alloy tubular part with a large expansion ratio. Effects of temperature on the mechanical properties and formability were studied by uniaxial tensile test and hydraulic bulge test. Total elongation increases with temperature up to 250℃, but uniform elongation and maximum expansion ratio get the highest value at 175℃. Different axial feeding amounts were applied in experiments to determine the reasonable loading path. A preform with useful wrinkles was then realized and the tubular part with an expansion ratio of 50% was formed. Finally, mechanical condition to produce useful wrinkles is deduced and the result illustrates that useful wrinkles are easier to be obtained for tube with higher strain hardening coefficient value and tubular part with smaller expansion ratio. 展开更多
关键词 warm hydroforming magnesium alloy tube expansion ratio hydraulic bulge test wrinkle
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Deformation and defects in hydroforming of Y-shaped tubes 认领 引用 被引量：3
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作者 程东明 滕步刚 +1 位作者 郭斌 苑世剑 《Journal of Harbin Institute of Technology(New Series)》 EI CAS 2008年第2期206-210,共5页
Hydroforming process of a Y-shaped stainless steel tube was investigated through numerical simulation and experiments. The forming process and reasons of typical defects were analyzed with three different loading path... Hydroforming process of a Y-shaped stainless steel tube was investigated through numerical simulation and experiments. The forming process and reasons of typical defects were analyzed with three different loading paths. Thickness distribution of formed Y-shaped tube was obtained. It is shown by numerical and experimental results that the transition regions are depressed in the forming condition of low inner pressure and wrinkles occur, while fracture occurs in the forming condition of high inner pressure. After forming, the thickness in left transition fillet region is the largest, that in fight transition fillet region is thinner, and the thinnest thickness is at the top of the protrusion. The original thickness line is below the top of the protrusion. The thinning area occurs above this line, while the thickening area is below this line. The maximum thinning rate is significantly increased as the calibration pressure increases, while the maximum thickening rate remains almost unchanged. 展开更多
关键词 hydroforming Y-shaped tube loading path defects thickness
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Fundamentals and Processes of Fluid Pressure Forming Technology for Complex Thin-Walled Components 认领 引用 被引量：48
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作者 Shijian Yuan 《Engineering》 SCIE EI CAS CSCD 2021年第3期358-366,共9页
A new generation of fluid pressure forming technology has been developed for the three typical structures of tubes,sheets,and shells,and hard-to-deform material components that are urgently needed for aerospace,aircra... A new generation of fluid pressure forming technology has been developed for the three typical structures of tubes,sheets,and shells,and hard-to-deform material components that are urgently needed for aerospace,aircraft,automobile,and high-speed train industries.in this paper,an over all review is introduced on the state of the art in fundamentals and processes for lower-pressure hydroforming of tubular components,double-sided pressure hydroforming of sheet components,die-less hydroforming of ellipsoidai shells,and dual hardening hot medium forming af hard-to-deform materiais Particular attention is paid to deformation behavior,stress state adjustment,defect prevention,and typical applications.In addition,future development directions of fluid pressure forming technology are discussed,including hyper lower-loading forming for ultra-large non-uniform components,precision for ming for intermetallic compound and high-entropy alloy components,intelligent process and equipment,and precise finite element simulation of inhomogeneous and strong anisotropic thin shells. 展开更多
关键词 Fluid pressure forming Hydroforming Hot medium pressure forming Thin-walled components Stress state
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Analysis of the Internal Pressure in Tube Hydroforming and Its Experimental Investigation 认领 引用 被引量：1
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作者 Hongyang LI Zhongren, WANG +2 位作者 Qibin MIAO Shijian YUAN Xiaosong WANG 《Journal of Materials Science & Technology》 SCIE EI CAS 2006年第2期284-288,共5页
The internal pressure of the process was studied theoretically and experimentally. The external load character and internal stress character of tube hydroforming were discussed first. Then, according to the characters... The internal pressure of the process was studied theoretically and experimentally. The external load character and internal stress character of tube hydroforming were discussed first. Then, according to the characters, the function and classification of internal pressure were presented in general. Base on the stress analysis, its effect on the yield criterion and calculation formula were also researched and derived. To verify the correction of the theoretical analysis and derived formula, experiments with different internal pressures were carried out and the result was compared and discussed. It demonstrates that internal pressure plays an important role in tube hydroforming and theory and formula discussed and derived by this paper are feasible in practice. 展开更多
关键词 Tube hydroforming Internal pressure Stress state Yield criterion
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Fuzzy Control Optimization of Loading Paths for Hydroforming of Variable Diameter Tubes 认领 引用 被引量：1
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作者 Yong Xu Xuewei Zhang +4 位作者 Wenlong Xie Shihong Zhang Xinyue Huang Yaqiang Tian Liansheng Chen 《Computers, Materials & Continua》 SCIE EI 2024年第11期2753-2768,共16页
The design of the loading path is one of the important research contents of the tube hydroforming process.Optimization of loading paths using optimization algorithms has received attention due to the inefficiency of o... The design of the loading path is one of the important research contents of the tube hydroforming process.Optimization of loading paths using optimization algorithms has received attention due to the inefficiency of only finite element optimization.In this paper,the hydroforming process of 5A02 aluminum alloy variable diameter tube was as the research object.Fuzzy control was used to optimize the loading path,and the fuzzy rule base was established based on FEM.The minimum wall thickness and wall thickness reduction rate were determined as input membership functions,and the axial feeds variable value of the next step was used as output membership functions.The results show that the optimized loading path greatly improves the uniformity of wall thickness and the forming effect compared with the linear loading path.The round corner lamination rate of the tube is 91.2%under the fuzzy control optimized loading path,which was increased by 47.1%and 22.6%compared with linear loading Path 1 and Path 2,respectively.Based on the optimized loading path in the experiment,the minimum wall thickness of the variable diameter tube was 1.32 mm and the maximum thinning rate was 12.4%.The experimental results were consistent with the simulation results,which verified the accuracy of fuzzy control.The research results provide a reference for improving the forming quality of thin-walled tubes and plates. 展开更多
关键词 Variable diameter tubes finite element simulation hydroforming fuzzy control
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Characteristics of thickness distribution of tailor-welded tube hydroforming 认领 引用 被引量：1
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作者 初冠南 刘钢 +1 位作者 苑世剑 刘文剑 《Journal of Central South University》 SCIE EI CAS 2011年第6期1813-1818,共6页
Both experimental and mechanical analyses were carded out to investigate the characteristics of thickness distribution for tailor-welded tube （TWT） hydroforming with dissimilar thickness. Then, the effects of weld-s... Both experimental and mechanical analyses were carded out to investigate the characteristics of thickness distribution for tailor-welded tube （TWT） hydroforming with dissimilar thickness. Then, the effects of weld-seam position and thickness difference were also revealed. A multiple-diameter tube was formed to reveal the characteristics and the regularity of thickness distribution during TWT hydroforming. It is indicated that there are obvious fluctuations in thickness distribution though the TWTs have the same expansion ratio. The thinning ratio of thinner tube is bigger than that of thicker tube especially in the zone closed to the weld-seam. The difference in thinning ratio between two tube segments can reach 9%. Consequently, sudden and large fluctuation of thickness appears in the zone nearby the weld-seam. The difference in thinning ratio between thinner and thicker tubes enlarges as the thickness difference increases, but improves as length ratio increases. Different strain states are the main reason to induce nonuniform thickness distribution. The difference in thickness is the main reason to induce different strain states on thinner and thicker tubes. 展开更多
关键词 tailor-welded tube thickness distribution hydroforming weight reduction
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Developments of New Sheet Metal Forming Technology and Theory in China 认领 引用 被引量：4
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作者 Shi-Hong Zhang Shuai-Feng Chen +2 位作者 Yan Ma Hong-Wu Song Ming Cheng 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 2015年第12期1452-1470,共19页
Developments of new sheet metal forming technology and theory in China are reviewed in detail in this paper.Advances of crystal plasticity on the deformation mechanism of Mg alloy are firstly described, especially its... Developments of new sheet metal forming technology and theory in China are reviewed in detail in this paper.Advances of crystal plasticity on the deformation mechanism of Mg alloy are firstly described, especially its applications on the prediction of sheet forming process. Then, a new macroscopic constitutive model is introduced, which possesses an enhanced description capacity of tension/compression anisotropy and anisotropic hardening. In order to take into account the twinning process of hexagonal close-packed material, a modified hierarchical multi-scale model is also established with adequate accuracy in a shorter computational time. The advanced forming limit of sheet metal, mainly about aluminum alloy, is also investigated. Besides the above theory developments, some new sheet metal forming technologies are reviewed simultaneously. The warm forming technology of Mg alloy is discussed. New processes to form sheet parts and to bend tubes are proposed by using hard granules. On the other hand, a new kind of ultra-high-strength steel based on typical22 Mn B5 by introducing more residual austenite and Cu-rich phase to increase the elongation and strength and its novel forming method that integrates hot stamping and quenching participation are proposed. Progresses in sheet hydroforming,press forging and electromagnetic forming of sheet metal parts are also summarized. 展开更多
关键词 Sheet forming Crystal plasticity Constitutive modeling Mg alloy UHSS Hot stamping Hydroforming Aluminum alloy
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Effect of Loading Paths on Hydroforming Tubular Square Components 认领 引用 被引量：3
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作者 Hongyang LI Shijian YUAN +3 位作者 Kun DAI Lihui LANG Xiaosong WANG Zhubin HE and Zhongren WANG School of Materials Science and Engineering, Harbin institute of Technology, Harbin 150001, China 《Journal of Materials Science & Technology》 SCIE EI CAS 2001年第1期
The influence of loading path on tube hydroforming process is discussed in this paper with finiteelement simulation. Four different loading paths are utilized in simulating the forming process of square tubular compon... The influence of loading path on tube hydroforming process is discussed in this paper with finiteelement simulation. Four different loading paths are utilized in simulating the forming process of square tubular component with hydroforming and the result of different loading path is presented. Among the result. the thickness distribution of bilinear loading path is the most uniform one. It shows that the increase of punch displacement in the stage of high pressure is beneficial to the forming of component for optimized Stress condition. 展开更多
关键词 Effect of Loading Paths on Hydroforming Tubular Square Components
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Optimization approach hydroforming car beam billets based grey system theory 认领 引用 被引量：1
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作者 吴耀金 薛勇 段江年 《Journal of Beijing Institute of Technology》 EI CAS 2011年第1期48-53,共6页
Perfect combination of structural size parameters of the hydroforming billets is essential to obtain even wall thicknesses of the car beam. Finite element （ FE ） analysis on hydroforming car beam was carried out, an... Perfect combination of structural size parameters of the hydroforming billets is essential to obtain even wall thicknesses of the car beam. Finite element （ FE ） analysis on hydroforming car beam was carried out, and the results were optimized according to multiple quality objectives by the grey system theory. With bending angle, bending radius and hight difference along the axis direction as variables, orthogonal FE analyses were conducted and the minimum and maximum wall thicknes ses of the billets with different sizes were obtained. Taking the minimum and maximum wall thick nesses as two references, the correlation coefficient between the data for reference and those for comparison by the grey system theory reduced multi objectives to a single quality objective, and the average correlation level of every billet facilitated the optimization of size parameters for hydroform ing car beam. The trial production showed that the optimization approach satisfied the need of hy droforming car beams. 展开更多
关键词 car beam hydroforming billet grey system theory multi objective optimization
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