The Effect of Hydraulic Bulge Process on the Surface Topography of Annealed AISI 304 Stainless Steel

Olayinka, Ayotunde; Emblom, William J.; Pasacreta, Thomas C.; Wagner, Scott W.

doi:10.1016/j.promfg.2017.07.052

Cited by 6 publications

(9 citation statements)

References 17 publications

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“…The linear relationship observed in the roughness seen in Figure 10 for the stainless steel bulge test samples is consistent with results from previous studies. 16,26 The slight dip experienced at higher strains, near the burst pressure has also been reported by other researchers. 27 This slight shift from linearity can be attributed to deformation induced thinning at the pole of the bulged dome, where the roughness was measured and which experienced the highest strains in the sample.…”

Section: Introductionsupporting

confidence: 85%

“…The tests are stopped at predetermined bulge or dome heights or pressures. 15,16 The change in dome height due to the increase in pressure and the resulting change in thickness are determined both analytically and experimentally. The strains in the bulged workpieces can be measured directly using either digital image correlation (DIC) or strain grid measurement.…”

Section: Introductionmentioning

confidence: 99%

“…In addition, several researchers have used analytical approaches in conjunction with hydraulic bulge tests to determine material properties that were incorporated into finite element models of metal forming operations. 10,15–17…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Surface roughness of AISI 1010 and AISI 304 of PEMFC bipolar plates with microscale hydroformed capillary channels

Olayinka

Emblom

2022

Proceedings of the Institution of Mechanical Engineers, Part B:

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As part of the efforts to produce robust, cost effective bipolar plates, it is necessary to evaluate the forming characteristics of potential materials under consideration. For this work the relationship between strain and deformation induced surface roughness was investigated for channels made from AISI 304 stainless steel and AISI 1010 mild steel that are formed using a hydroforming process. The experiment investigated the effect of channel geometry and hydroforming pressure on surface roughness of the sheet metals under consideration. It is important to state that some functional properties and manufacturing processes of metallic bipolar plates are dependent on the surface roughness of the materials. The results indicate that the final roughness of the formed part is dependent on the initial roughness of the as received sheet. Also, the results show that the surface roughness increases with increasing forming pressure and the resulting increase in strain of the sheet metal due to deformation.

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Section: Introductionsupporting

confidence: 85%

Section: Introductionmentioning

confidence: 99%

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Surface roughness of AISI 1010 and AISI 304 of PEMFC bipolar plates with microscale hydroformed capillary channels

Olayinka

Emblom

2022

Proceedings of the Institution of Mechanical Engineers, Part B:

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“…Hydrostatic forming for sheet metal has many advantages such as improving the ability to shape complex parts, increasing surface quality, and especially suitable for shaping lightweight and thin sheet materials [12][13][14]. Because of its superiority, there have been many studies on this technology over the years with different aspects of materials, temperatures, and die structures [15][16][17][18][19][20]. In hydrostatic forming process, the workpiece is remarkably thinned because of bulging phase under the action of a high-pressure liquid.…”

Section: Introductionmentioning

confidence: 99%

On the thinning variations in hydrostatic forming of sheet metal

Nguyen

Trung

2021

JMES

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In sheet metal forming, thinning phenomenon is one of the most concerned topics to ameliorate the final quality of the manufactured parts. The thinning variations depend on many input parameters, such as technological parameters, geometric shape of die, workpiece’s materials, and forming methods. Hydrostatic forming technology is particularly suitable for forming thin-shell products with complex shapes. However, due to the forming characteristics, the thinning variations in this technology are much more intense than in other forming methods. Therefore, in this paper, an empirical study is developed to determine the thinning variations in hydrostatic forming for cylindrical cup. Measurement of thickness at various locations of deformed products are conducted to investigate the thickness distribution and determine the dependence of the largest thinning ratio on the input parameters (including the blank holder pressure, the relative depth of the die and the relative thickness of the workpiece). The results are expressed in charts and equation which allow determining the effect of each input parameter on the largest thinning ratio.

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“…In this context, the main concerns are technological parameters such as the forming fluid pressure, closing pressure, shape of die, friction, workpiece material, etc. [3,[13][14][15][16][17][18][19]. Among them, a large amount of research on forming liquid pressure parameters has been published to determine their influence on the forming process and product quality [20][21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%

Experimental Modeling of Pressure in the Hydrostatic Formation of a Cylindrical Cup with Different Materials

Nguyen

Bui

2021

Applied Sciences

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Forming complex sheet products using hydrostatic forming technology is currently a focus of the majority of forming processes. However, in order to increase stability during the forming process, it is necessary to identify and analyze the dependency of the forming pressure and the quality of a product on input parameters. For the purpose of modeling the forming pressure, this paper presents empirical research on the product of a cylindrical cup made of various materials, including carbon steel (DC04), copper (CDA260), and stainless steel (SUS 304) with different thicknesses (0.8 mm, 1.0 mm, and 1.2 mm), under a defined range of binder pressures. The regression method is selected to formulate an equation that shows the relationship between the input parameters, including the materials (ultimate strength and yield stress), workpiece thickness, binder pressure and the output parameter, and the formation of fluid pressure. The mathematical equation allows us to determine the extent of the effect of each input on the forming pressure. The experimental results can be used for the easier planning and forecasting of the process and product quality in hydrostatic forming.

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The Effect of Hydraulic Bulge Process on the Surface Topography of Annealed AISI 304 Stainless Steel

Cited by 6 publications

References 17 publications

Surface roughness of AISI 1010 and AISI 304 of PEMFC bipolar plates with microscale hydroformed capillary channels

Surface roughness of AISI 1010 and AISI 304 of PEMFC bipolar plates with microscale hydroformed capillary channels

On the thinning variations in hydrostatic forming of sheet metal

Experimental Modeling of Pressure in the Hydrostatic Formation of a Cylindrical Cup with Different Materials

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