Investigation of failure during rubber pad forming of metallic bipolar plates

Talebi-Ghadikolaee, Hossein; Elyasi, Majid; Mirnia, Mohammad Javad

doi:10.1016/j.tws.2020.106671

Cited by 32 publications

(8 citation statements)

References 39 publications

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“…The flow channels are machined when graphite is used as cooling plate. However, in addition to machining, stamping, hydroforming or roll forming methods are also utilized in the case of metallic plates [9]- [12]. The cooling fluids are circulated through the flow fields formed on cooling plates.…”

Section: Figure 1 Pem Fuel Cell Components and Coolingmentioning

confidence: 99%

Computational Thermal Analysis of Divergent and Convergent Flow Channels for Cooling Plates in PEM Fuel Cells

Acar¹

2023

Bitlis Eren Üniversitesi Fen Bilimleri Dergisi

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During the operation of polymer electrolyte membrane fuel cells excess heat is generated as a result of electrochemical reactions. This heat raises the temperature of the polymer electrolyte membrane fuel cells, which can damage the membrane. Homogeneity of the temperature through the fuel cell is important in terms of stability and performance. Thermal management is therefore essential and is provided by the cooling channels formed on the bipolar plates or cooling plates. In this paper, a three-dimensional computational analysis of the cooling plate with divergent and convergent flow field designs is carried out. In this context, heat transfer and fluid flow performances of these two different flow fields are considered in terms of temperature uniformity, maximum temperature and pressure drop. Numerical results demonstrated that the more uniform temperature distribution along the fuel cell could be achieved with divergent flow field design. Furthermore, when a divergent design is used, the maximum surface temperature of the cooling plate and the pressure drop between the inlet and outlet of the channel are reduced.

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Section: Figure 1 Pem Fuel Cell Components and Coolingmentioning

confidence: 99%

Computational Thermal Analysis of Divergent and Convergent Flow Channels for Cooling Plates in PEM Fuel Cells

Acar¹

2023

Bitlis Eren Üniversitesi Fen Bilimleri Dergisi

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“…The uniaxial tension test was selected because the shear parameter k w does not affect damage accumulation in the uniaxial stress state. In this state, the value of the ξ parameter is equal to one and, as a result, the void shear mechanism is deactivated based on equation (9). The in-plane shear test was mainly employed to determine the k w parameter based on Nahshon and Hutchinson's fracture mechanism.…”

Section: Calibration Of the Gtn Modelsmentioning

confidence: 99%

“…It was found that the bending radius, stress level, and friction coefficient influence the type and position of the fracture in the stretched-bending process. Talebi-Ghadikolaee et al 9 applied the different uncoupled ductile fracture models, including Rice-Tracey, Ayada, and normalized Cockroft-Latham, to predict fracture in the rubber pad forming process of the metallic bipolar plate. Among these models calibrated by a uniaxial tension test, the normalized Cockroft-Latham model had the most accurate predictions.…”

Section: Introductionmentioning

confidence: 99%

Fracture prediction of AA6061-T6 sheet in bending process using Gurson–Tvergaard–Needleman model

Khademi

Naeini

Mirnia

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part L:

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Fracture is one of the limiting factors of sheet metal forming processes. For this reason, finite element simulations are widely used for providing suitable forming approaches. However, the success of these approaches depends on the correct modeling of fracture in the simulations. In this paper, the fracture behavior of the Aluminum 6061-T6 sheet in the U-bending process is investigated by applying the Gurson–Tvergaard–Needleman model. For this purpose, the Gurson–Tvergaard–Needleman model is defined in the ABAQUS software by means of a proper subroutine. The Gurson–Tvergaard–Needleman model is also modified to take into account the anisotropy effect on the yield surface and the damage evolution due to shear stresses. Then, the proposed models are calibrated using the inverse analysis method based on tension tests with different stress states. The deformation mechanics analysis reveals that considering the normalized Lode angle parameter in the damage function increases the accuracy of fracture prediction, especially in low-stress triaxiality. Comparing the predicted fracture displacements with the experimental value in the U-bending process shows that the modified Gurson–Tvergaard–Needleman model calibrated by the uniaxial tension and in-plane shear tension tests can predict the onset of fracture with acceptable accuracy in the bending process while the original Gurson–Tvergaard–Needleman should be calibrated by a test with stress state close to that in the bending area to have such a result.

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“…The first function was gas sealing: the gasket and adhesive film were bound via hot pressing between the anode and cathode of the metallic flow plate, forming a modularized unit, known as a "bipolar plate module." Gaskets [37] that are made of anti-corrosion plastic function as manifolds for anode gas, hydrogen, and cathode air, avoiding gas crossover, as shown in Figure 2. The second function was the MEA border: with a metal border adhered with thin film in the modularization of the MEA, a robust stack was assembled.…”

Section: Assembly Proceduresmentioning

confidence: 99%

Effect of Metallic Bipolar Plates Fillet Radii on Fuel Cell Performance

et al. 2021

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This paper studies the effects of compression, deformation, and the contact area in the membrane electrode assembly (MEA). The electrical impedance of fuel cell stacks due to the assembly of the metallic bipolar plates is also considered. According to decades-long fuel cell (FC) assembly experience, an increase in compression force can result in adequate contact resistance, but excessive compression may cause extra contact resistance and damage to the MEA structure. The study suggests a design for improving the performance of the FC stack by proposing different fillet radii metallic bipolar plates. It is found that the appropriate fillet radius reduces contact resistance by 13% and avoids the accumulation of compression, thereby maintaining contact resistance at adequate levels. The current design proposes a simple and effective method to minimize the dimension tolerance of single fuel cell units and support sufficient compression.

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Investigation of failure during rubber pad forming of metallic bipolar plates

Cited by 32 publications

References 39 publications

Computational Thermal Analysis of Divergent and Convergent Flow Channels for Cooling Plates in PEM Fuel Cells

Computational Thermal Analysis of Divergent and Convergent Flow Channels for Cooling Plates in PEM Fuel Cells

Fracture prediction of AA6061-T6 sheet in bending process using Gurson–Tvergaard–Needleman model

Effect of Metallic Bipolar Plates Fillet Radii on Fuel Cell Performance

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