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5A06-O aluminium−magnesium alloy sheet warm hydroforming and optimization of process parameters

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Transactions of Nonferrous Metals Society of China 2021年第10期31卷 2939-2948页

作者： Zhi-hui JIAO Li-hui LANG Xiang-ni ZHAO School of Mechanical Engineering and Automation Beihang UniversityBeijing 100191China

The uniaxial tensile test of the 5A06-O aluminium−magnesium(Al−Mg)alloy sheet was performed in the temperature range of 20−300℃ to obtain the true stress−true strain curves at different temperatures and strain *** constitutive model of 5A06-O Al−Mg alloy sheet with the temperature range from 150 to 300℃ was *** on the test results,a unique finite element simulation platform for warm hydroforming of 5A06-O Al−Mg alloy was set up using the general finite element software *** to simulate warm hydroforming of classic specimen,and a coupled thermo-mechanical finite element model for warm hydroforming of cylindrical cup was built *** with the experiment,the influence of the temperature field distribution and loading conditions on the sheet formability was *** results show that the non-isothermal temperature distribution conditions can significantly improve the forming performance of the *** the temperature increases,the impact of the punching speed on the forming becomes particularly obvious;the optimal values of the fluid pressure and blank holder force required for forming are reduced.

关键词： Al−Mg alloy constitutive model warm hydroforming finite element analysis non-isothermal temperature field

Wrinkling behavior of magnesium alloy tube in warm hydroforming

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Transactions of Nonferrous Metals Society of China 2010年第7期20卷 1288-1293页

作者：汤泽军刘钢何祝斌苑世剑 School of Materials Science and Engineering Harbin Institute of Technology

In tube hydroforming with axial feeding,under the effect of coupled internal pressure and axial stress,wrinkles often occur and affect the forming *** behavior of an AZ31B magnesium alloy tube was experimentally investigated with different loading paths at different *** of wrinkles,including shape,radius and width,were acquired from the experiments,as well as the thickness *** 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 ***,effects of loading paths on expansion ratio limit of warm hydroforming were *** 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.

关键词： warm hydroforming magnesium alloy tube wrinkle internal pressure AZ31B magnesium alloy

Modified MK model combined with ductile fracture criterion and its application in warm hydroforming

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Transactions of Nonferrous Metals Society of China 2015年第10期25卷 3389-3398页

作者：杨希英郎利辉刘康宁郭禅北京航空航天大学机械工程及自动化学院北京100191

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 *** 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 *** FLDs at 20 and 200 °C are calculated through the DFC-MK *** DFC-MK model,which includes the influence of through-thickness normal stress,is written into the subroutine VUMAT embedded in Abaqus/ *** cylindrical cup hydroforming tests are carried out to verify 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.

关键词： MK model ductile fracture criteria warm hydroforming through-thickness normal stress

Corner forming of AZ61A magnesium alloy tube within warm hydroforming

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Journal of Harbin Institute of Technology(New Series) 2009年第2期16卷 227-231页

作者：胡蓝韩聪何祝斌汤泽军刘钢苑世剑 National Key Laboratory of Precision Hot Processing of Metals Harbin Institute of Technology

The comers with small radii on cross sections are crucial for forming hydroformed components with polygonal sections. In this paper, warm hydroforming experiments of AZ61A magnesium alloy tubes were cartied out to study the forming regularity of round comers by using a demonstration part with square sections. Effects of temperature on radius forming, thinning ratio distribution and microstructure were revealed and a component with relative outer corner radius of 3.0 was obtained by warm hydroforming at 240℃. The minimum thickness of the formed square section was located in the transition position between the corner and the straight wall. The thinning ratio of the round corner increased with the increase of forming temperature. Fotmability of the magnesium tube was improved by raising temperature under the effect of dynamic recrystallization at 240℃.

关键词： warm hydroforming magnesium alloy thickness distribution