Investigation on deformation behavior of magnesium alloy sheet AZ31B in pulsating hydroforming

Hu, Guolin; Pan, Chunrong

doi:10.1177/0954405420947950

Cited by 10 publications

(4 citation statements)

References 15 publications

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“…It is found that the initial hydraulic pressure, the maximum hydraulic pressure, and the loading path are the basic parameters that directly affect the forming quality and dimensional accuracy. Hu et al 27 used a combination of experimental research, numerical simulation, and theoretical analysis to study the deformation properties of AZ31B magnesium alloy sheets with a thickness of 0.6 mm under pulsating hydroforming. A new evaluation index is proposed to determine the optimal forming parameters of AZ31B magnesium alloy sheet under pulsating loading conditions.…”

Section: Introductionmentioning

confidence: 99%

Multi-objective optimization of loading path for sheet hydroforming of tank bottom

Zhang

Zhou

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part B:

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As a critical component of the propellant tank, the tank bottom is subjected to complex loads such as internal pressure and vibration and has high requirements for structural load-bearing capacity. Hydroforming deep drawing is one of the techniques for the integral forming of the tank bottom. As the tank bottom is a large-size thin-walled structure, defects such as cracks and wrinkles are prone to occur during the hydroforming deep drawing process. Aiming at reducing these defects, the hydraulic pressure loading path and blank holder force loading path of the hydroforming deep drawing process are studied, and a multi-objective optimization method is proposed to improve the surface accuracy and thickness distribution uniformity of the tank bottom. The complex loading path curve optimization problem is transformed into a functional relationship between hydraulic pressure and blank holder force with time. The hydraulic pressure and blank holder force at each time node are used as design variables, and the maximum wall thickness reduction rate, rupture trend factor, wrinkle height, and wrinkle trend factor are used as optimization targets. The radial basis function (RBF) neural network is used to establish the approximate model between the loading path and the optimization target, and the multi-objective particle swarm optimization (MOPSO) algorithm is used to optimize the solution. Taking the hemispherical tank bottom as an example, the optimal hydraulic pressure loading path and blank holder force loading path are obtained, and the quality of the formed part is improved.

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Section: Introductionmentioning

confidence: 99%

Multi-objective optimization of loading path for sheet hydroforming of tank bottom

Zhang

Zhou

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part B:

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“…One of the most important issues in metal forming processes is to improve the uniformity of the products and avoid a number of defects such as tearing and wrinkling. 12 Several factors, such as the process parameters and the die geometry, affect the formability and thickness distribution of final product obtained from the forming process. 13 On the other hand, regarding composite materials, earlier studies often focused on the maximum thickness reduction and thickness distribution of the entire bimetallic specimen.…”

Section: Introductionmentioning

confidence: 99%

Effects of process variables on the uniformity of Al-St and Al-Mg laminated composite cups produced by hydro-mechanical deep drawing operation

Yaghoubi

Fereshteh-Saniee

2022

Proceedings of the Institution of Mechanical Engineers, Part B:

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Hydro-mechanical deep drawing (HMDD) process is comparatively a new technique in sheet metal forming. The present study focuses on the use of HMDD for bimetallic components comprising aluminum and steel sheets as well as aluminum and magnesium blanks. Carrying out both experiments and numerical simulations, the effects of process parameters such as drawing depth, the fluid pressure inside the die and the process temperature were profoundly investigated. To study the effect of the process temperature on the quality of the product, the specimens were formed at both the room temperature and 200°C. Considering the maximum thickness strain and thickness variation of the specimens as measures of product quality, various results, including those obtained from the design of experiments (DOE), illustrated significant impacts of all the considered factors on the quality of the final product. The findings also showed that for the bimetallic aluminum/steel specimen, the Al/St layer sequence offered a higher quality compared with the St/Al arrangement under the same process conditions. The amount of thickness strain and thickness variation in the Al/St arrangement, compared with the St/Al sequence, were respectively improved by 27.4% and 12.6%, for the optimal value of the maximum fluid pressure (150 bar). Moreover, the thickness variation of the Al/Mg specimen was smaller than that of Al/St bimetallic cup, regardless of the drawing depth.

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“…The sheet hydroforming process has a wide range of applications in automotive, aerospace, etc, and has many advantages over conventional deep drawing. [1][2][3][4][5] In recent years, hydrodynamic deep drawing assisted by radial pressure (HDDRP) has given good results in the forming of parts with a higher limit drawing ratio. In HDDRP, the blank is formed on the surface of the punch by the pressurized liquid in the die cavity.…”

Section: Introductionmentioning

confidence: 99%

Investigation of consecutive two-stage hydrodynamic deep drawing of aluminum cylindrical cups

Hashemi

Seyedkashi

2021

Proceedings of the Institution of Mechanical Engineers, Part B:

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In the deep drawing process, achieving a higher drawing ratio has always been considered by researchers. In this study, a new concept of hydrodynamic deep drawing with two consecutive stages without additional operations such as annealing is proposed to increase the limit drawing ratio of the cups. The effective parameters were investigated numerically and experimentally in the forming of Al1200 cylindrical cups. At first, the desired value of punch diameter ratio was determined based on finite element simulation results and was utilized to increase the cup formability. Next, the effects of pressure paths on the cup thickness, separation, and rupture were studied in each forming stage. The cup formability was investigated based on a new proposed framework to obtain the maximum possible limiting drawing ratio, and the desired conditions were determined. Finally, a cup was formed with a high drawing ratio of 3.4 which was a good achievement in comparison with the literature.

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Investigation on deformation behavior of magnesium alloy sheet AZ31B in pulsating hydroforming

Cited by 10 publications

References 15 publications

Multi-objective optimization of loading path for sheet hydroforming of tank bottom

Multi-objective optimization of loading path for sheet hydroforming of tank bottom

Effects of process variables on the uniformity of Al-St and Al-Mg laminated composite cups produced by hydro-mechanical deep drawing operation

Investigation of consecutive two-stage hydrodynamic deep drawing of aluminum cylindrical cups

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