Formability limits by wrinkling in sheet metal forming

Magrinho, J.P.; Silva, M.B.; Martins, Paulo

doi:10.1177/1464420716642794

Cited by 12 publications

(10 citation statements)

References 12 publications

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“…Taking the strain energy expression in the same form as equations ( 16) and (17), and substituting equations ( 39) to ( 41), ( 30), (16), and (17) into equation (31), the critical condition for occurring the plastic wrinkling is obtained as…”

Section: Plastic Wrinkling Of Two-layer Circular Sheets With Blank Holder Forcementioning

confidence: 99%

“…They also predicted wrinkle formation at the flange region for various metals such as copper, brass, ST12, and ST14. Magrinho et al 16 combined the theoretical and experimental methods to obtain the wrinkling and forming limit diagram. They used the finite element (FE) simulation to conduct cylindrical deep drawing without the use of a blank holder.…”

Section: Introductionmentioning

confidence: 99%

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Analytical and numerical investigation of wrinkling limit diagram in deep drawing of two-layer sheets with experimental verification

Bamdad

Hashemi

2021

Proceedings of the Institution of Mechanical Engineers, Part L:

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Wrinkling, which is primarily caused by insufficient blank holder force, is a significant issue that induces inconsistencies in forming parts, particularly in the deep drawing process. In this article, an investigation of the wrinkling in the deep drawing process of two-layer sheets is performed through an analytical approach, numerical method, and experimental tests. Increasing in the blank holder force, the process is under control by the proposed algorithm. Consequently, it aims to find the minimum required blank holder force to avoid wrinkling. The energy technique is utilized to predict the wrinkling in the analytical approach. Similarly, finite element simulations are implemented to investigate the effect of forming parameters on wrinkling. The experimental tests are performed to verify the analytical and numerical results. The impact of the material properties and stacking sequences (lay-up) on blank holder force and forming force are studied. Results show that the optimum blank holder force is dependent on the material properties, blank geometry, and layer stacking sequences. Also, a good agreement between analytical, numerical, and experimental results is achieved.

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Section: Plastic Wrinkling Of Two-layer Circular Sheets With Blank Holder Forcementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Analytical and numerical investigation of wrinkling limit diagram in deep drawing of two-layer sheets with experimental verification

Bamdad

Hashemi

2021

Proceedings of the Institution of Mechanical Engineers, Part L:

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“…are continuously performed using the horizontal press in the 2nd stage, and finally redrawing and ironing processes (D.I.) are operated to obtain the final thickness and diameter of the liner in the 3rd stage as shown in Figure 3 [9,10]. Theoretical design rules of the D.D.I.…”

Section: Ddi Processmentioning

confidence: 99%

Integrated Design of D.D.I., Filament Winding and Curing Processes for Manufacturing the High Pressure Vessel (Type II)

Kwak

Park

Seong

et al. 2019

Chin. J. Mech. Eng.

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As energy crisis and environment pollution all around the world threaten the widespread use of fossil fuels, compressed natural gas (CNG) vehicles are explored as an alternative to the conventional gasoline powered vehicles. Because of the limited space available for the car, the composite pressure vessel (Type II) has been applied to the CNG vehicles to reach large capacity and weight lightening vehicles. High pressure vessel (Type II) is composed of a composite layer and a metal liner. The metal liner is formed by the deep drawing and ironing (D.D.I.) process, which is a complex process of deep drawing and ironing. The cylinder part is reinforced by composite layer wrapped through the filament winding process and is bonded to the liner by the curing process. In this study, an integrated design method was presented by establishing the techniques for FE analysis of entire processes (D.D.I., filament winding and curing processes) to manufacture the CNG composite pressure vessel (Type II). Dimensions of the dies and the punches of the 1st (cup drawing), 2nd (redrawing-ironing 1-ironing 2) and 3rd (redrawing-ironing) stages were calculated theoretically, and shape of tractrix die to be satisfied with the minimum forming load was suggested for life improvement and manufacturing costs in the D.D.I. process. Thickness of the composite material was determined in the filament winding process, finally, conditions of the curing process (number of heating stage, curing temperature, heating rate and time) were proposed to reinforce adhesive strength between the composite layers.

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“…The obtained analytical results using Hill’s bifurcation method reveal that ST12 had highest compressive instability, whereas copper plate had lowest compressive instability. The theoretical and experimental approach was combined by Magrinho et al 78 to determine the wrinkling and formability limits in sheet metal forming. The numerical simulation was used to carry out cylindrical deep drawing without a use of blank holder.…”

Section: Wrinkling Effectmentioning

confidence: 99%

A review on effect of thinning, wrinkling and spring-back on deep drawing process

Babu

2018

Proceedings of the Institution of Mechanical Engineers, Part B:

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There are various processes practiced in a market for manufacturing axisymmetrical cup with significant forming depth among which deep drawing process is most prompt. The deep drawing process is a forming process with ongoing interest which will have a major impact on industries in coming years. This article focuses on the current status and potential of future development of technology in the deep drawing process. First, it describes various types of approaches and techniques used in the deep drawing of different materials. This is followed by brief reviews of advantages and limitations of these technologies with its application in industries. The details of these technologies are just referred rather than explaining in detail. The further part of this article focuses on advanced methods for predicting defects like thinning, wrinkling and spring-back in deep drawing process which are mostly responsible for rejection of the components. The opportunity in the development of flexibility in deep drawing process is covered with an observed barrier in the prediction of defects such as thinning, wrinkling and spring-back. The obtained evidence indicates that deep drawing process may not be applicable for all materials, but represents an excellent opportunity in the drawing of multilayer metal and composite material sheets to complex shapes.

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Formability limits by wrinkling in sheet metal forming

Cited by 12 publications

References 12 publications

Analytical and numerical investigation of wrinkling limit diagram in deep drawing of two-layer sheets with experimental verification

Analytical and numerical investigation of wrinkling limit diagram in deep drawing of two-layer sheets with experimental verification

Integrated Design of D.D.I., Filament Winding and Curing Processes for Manufacturing the High Pressure Vessel (Type II)

A review on effect of thinning, wrinkling and spring-back on deep drawing process

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